@MISC{10985-11331,
	address = {France},
	year = {2015},
	author = {FILLEUL, Marie-Pierryle and LAHEURTE, Pascal and TERRASSE, Jean-Maxime and GEORGE, Olivier and PELTIER, Laurent},
	abstract = {Ressort d'orthodontie hélicoïdal et son procédé de fabrication},
	edition = {Post-print},
	title = {Ressort d'orthodontie hélicoïdal et son procédé de fabrication},
	publisher = {European Patent Office},
	url = {http://hdl.handle.net/10985/11331}
}

@ARTICLE{10985-10097,
	journal = {Materials Science and Engineering: C},
	volume = {38},
	pages = {151-160},
	year = {2014},
	author = {PIOTROWSKI, Boris and BAPTISTA, André and PATOOR, Etienne and BRAVETTI, Pierre and EBERHARDT, André and LAHEURTE, Pascal},
	abstract = {Although mechanical stress is known as being a significant factor in bone remodeling, most implants are still made using materials that have a higher elastic stiffness than that of bones. Load transfer between the implant and the surrounding bones is much detrimental, and osteoporosis is often a consequence of such mechanical mismatch. The concept of mechanical biocompatibility has now been considered for more than a decade. However, it is limited by the choice of materials, mainly Ti-based alloys whose elastic properties are still too far from cortical bone. We have suggested using a bulk material in relation with the development of a new beta titanium-based alloy. Titanium is a much suitable biocompatible metal, and beta-titanium alloys such as metastable TiNb exhibit a very low apparent elastic modulus related to the presence of an orthorhombic martensite. The purpose of the present work has been to investigate the interaction that occurs between the dental implants and the cortical bone. 3D finite element models have been adopted to analyze the behaviour of the bone-implant system depending on the elastic properties of the implant, different types of implant geometry, friction force, and loading condition. The geometry of the bone has been adopted from a mandibular incisor and the surrounding bone. Occlusal static forces have been applied to the implants, and their effects on the bone-metal implant interface region have been assessed and compared with a cortical bone/ bone implant configuration. This work has shown that the low modulus implant induces a stress distribution closer to the actual physiological phenomenon, together with a better stress jump along the bone implant interface, regardless of the implant design.},
	issn = {0928-4931},
	edition = {Post-print},
	title = {Interaction of bone-dental implant with new ultra low modulus alloy using a numerical approach},
	publisher = {Elsevier},
	url = {10.1016/j.msec.2014.01.048}
}

@ARTICLE{10985-12139,
	journal = {Welding in the World},
	volume = {61},
	pages = {1253-1265},
	year = {2017},
	author = {SIREDEY-SCHWALLER, Nathalie and HAMEL-AKRÉ, Johann and PELTIER, Laurent and HAZOTTE, Alain and BOCHER, Philippe},
	abstract = {Various Ni-Si-Cr-B brazing alloys with a similar boron content (3 wt%) are investigated. Alloy compositions cover a section of the quaternary phase diagram that connects BNi-3 to BNi-9 ternary alloys for industrial use. Samples were melted and solidified at low cooling rate (1 K/min) under secondary vacuum to minimize oxidation and the metastable phase formation. Transformation temperatures, microstructures, and chemical analyses are reported. Experimental conditions were found to play a significant role on the accuracy of obtained data. Thermodynamic data were collected upon heating. Before analyzing quaternary alloys, the results of investigated ternary alloys were compared with the literature and discussed.},
	issn = {0043-2288},
	edition = {Post-print},
	title = {Solidification sequence of Ni-Si-Cr ~3wt% B brazing alloys},
	number = {6},
	publisher = {Springer},
	url = {10.1007/s40194-017-0503-4}
}

@ARTICLE{10985-10100,
	journal = {Journal of Intelligent Material Systems and Structures},
	volume = {23},
	pages = {141-153},
	year = {2012},
	author = {PIOTROWSKI, Boris and BEN ZINEB, Tarak and EBERHARDT, André and PATOOR, Etienne},
	abstract = {This paper deals with the design of Ni47Ti44Nb9 Shape Memory Alloy (SMA) tightening components. The tightening of an SMA ring on an elastic pipe is analyzed using the finite element code ABAQUS® and a UMAT subroutine developed in our group to model the specific behavior of Ni47Ti44Nb9 SMA. Main features of the thermomechanical model implemented in this UMAT routine are briefly recalled. Numerical predictions are validated using experimental tightening pressures obtained on a test bed developed in this work. The validation strategy is documented and the results for different ring thicknesses are presented. This finite element tool is then applied to a parametric study of the influence of ridges on the tightening pressure. Eventually, geometrical defects like out of roundness are considered.},
	issn = {1045-389X},
	edition = {Post-print},
	title = {A finite-element based numerical tool for Ni47Ti44Nb9 SMA structures design application to tightening rings},
	number = {2},
	publisher = {SAGE Publications},
	url = {10.1177/1045389X11429852}
}

@ARTICLE{10985-14355,
	journal = {Materials Science and Engineering: C},
	volume = {62},
	pages = {852-859},
	year = {2016},
	author = {FISCHER, Marie and JOGUET, David and ROBIN, Guillaume and PELTIER, Laurent and LAHEURTE, Pascal},
	abstract = {Ti–Nb alloys are excellent candidates for biomedical applications such as implantology and joint replacement because of their very low elastic modulus, their excellent biocompatibility and their high strength. A low elastic modulus, close to that of the cortical bone minimizes the stress shielding effect that appears subsequent to the insertion of an implant. The objective of this study is to investigate the microstructural and mechanical properties of a Ti–Nb alloy elaborated by selective laser melting on powder bed of a mixture of Ti and Nb elemental powders (26 at.%). The inﬂuence of operating parameters on porosity of manufactured samples and on efﬁcacy of dissolving Nb particles in Ti was studied. The results obtained by optical microscopy, SEM analysis and X-ray microtomography show that the laser energy has a signiﬁcant effect on the compactness and homogeneity of the manufactured parts. Homogeneous and compact samples were obtained for high energy levels. Microstructure of these samples has been further characterized. Their mechanical properties were assessed by ultrasonic measures and the Young's modulus found is close to that of classically elaborated Ti–26Nb ingot.},
	issn = {0928-4931},
	edition = {Post-print},
	title = {In situ elaboration of a binary Ti–26Nb alloy by selective laser melting of elemental titanium and niobium mixed powders},
	publisher = {Elsevier},
	url = {10.1016/j.msec.2016.02.033}
}

@ARTICLE{10985-10020,
	journal = {Mechanics of Materials},
	volume = {68},
	pages = {120-136},
	year = {2014},
	author = {CHEMISKY, Yves and CHATZIGEORGIOU, George and PARIKSHITH, Kumar and LAGOUDAS, Dimitris},
	abstract = {In this work, a three dimensional constitutive model for High Temperature Shape Memory Alloys (HTSMAs) is presented. To describe the evolution of the cyclic actuation behavior of such alloys, viscoplastic mechanisms and transformation induced plasticity are introduced in addition to the classical transformation behavior of Shape Memory Alloys. Based on contin- uum thermodynamics, the evolution of phase transformation, plasticity induced transforma- tion, retained martensite and viscoplasticity are described. Deformation mechanisms that occur over the operational range of such HTSMAs have been identified from the thermome- chanical behavior of a NiTiPd alloy. The proposed model has therefore been validated based on the prediction of the thermomechanical behavior of the studied NiTiPd HTSMA alloy under di↵erent loading conditions. Careful attention is devoted to the calibration procedure to identify the contribution of the di↵erent mechanisms independently. Finite element anal- ysis (FEA) is performed to demonstrate the capabilities of the model to describe the cyclic behavior of HTSMA devices.},
	issn = {0167-6636},
	edition = {Pre-print},
	title = {A constitutive model for cyclic actuation of high-temperature shape memory alloys},
	publisher = {Elsevier},
	url = {10.1016/j.mechmat.2013.07.020}
}

@ARTICLE{10985-10050,
	journal = {Composites Part B: Engineering},
	volume = {76},
	pages = {89-104},
	year = {2015},
	author = {TSALIS, Dimitrios and CHATZIGEORGIOU, George and TSAKMAKIS, Charalampos and CHARALAMBAKIS, Nicolas},
	abstract = {In this paper we present an internal variable-based homogenization of a composite made of wavy elastic-perfectly plastic layers. In the context of a strain-driven process, the macrostress and the effective yield surface are expressed in terms of the residual stresses, which act as hardening parameters in the effective behavior of the composite. Moreover, an approximate two-steps homogenization scheme useful for composites made of matrix with wavy inclusions is proposed and a comparison with one computational and one semi-analytical homogenization method is presented.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Dissipation inequality-based periodic homogenization of wavy materials},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2015.02.014}
}

@CONFERENCE{10985-10366,
	address = {Grèce},
	year = {2015},
	author = {TSALIS, Dimitrios and BONNAY, Kevin and CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas},
	abstract = {In this paper, the analytical solution of the multiple - step homogenization problem for multi - rank composites with generalized periodicity made of elastic materials is presented. The proposed homogenization scheme is combined with computational homogenization for solving more complex microstructures. Two numerical examples arepresented, concerning a “chevron” composite and a wavy fiber reinforced composite.},
	edition = {Post-print},
	title = {Multiscale homogenization of multilayered structures},
	url = {http://hdl.handle.net/10985/10366}
}

@ARTICLE{10985-11914,
	journal = {Journal of the mechanical behavior of biomedical materials},
	volume = {71},
	pages = {32-42},
	year = {2017},
	author = {MUSSOT-HOINARD, Geneviève and ELMAY, Wafa and PELTIER, Laurent and LAHEURTE, Pascal},
	abstract = {In the present work, structural fatigue experiments were performed on a Ti-26Nb alloy subjected to different thermomechanical treatments: a severe cold rolling, a solution treatment and two aging treatments at low-temperature conducted after cold rolling in order to optimize the kinetics of precipitation. The aim is to investigate the effect of microstructural refinement obtained by these processes on fatigue performances. Preliminary tensile tests were performed on each state and analyzed in terms of the microstructure documented by using X-Ray diffraction and TEM analysis. These tests clearly promote the short-time-aged cold-rolled state with a fine α and ω phases precipitation. An interesting balance between mechanical properties such as high strength and low Young's modulus has been obtained. Cyclic bending tests were carried out in air at 0.5%, 1%, 2% and 3% imposed strain amplitudes. At low straining amplitude, where the fatigue performances are at their best, the cold-rolled state does not break at 3×10E6 cycles and the long-time aged precipitation hardened state seems to be a good competitor compared to the cold-rolled state. All failure characteristics are documented by Scanning Electron Microscopy (SEM) micrographs and analyzed in term of microstructure.},
	issn = {1751-6161},
	edition = {Post-print},
	title = {Fatigue performance evaluation of a Nickel-free titanium-based alloy for biomedical application - Effect of thermomechanical treatments},
	publisher = {Elsevier},
	url = {10.1016/j.jmbbm.2017.02.024}
}

@ARTICLE{10985-14356,
	journal = {Materials Science and Engineering: C},
	volume = {75},
	pages = {341-348},
	year = {2017},
	author = {FISCHER, Marie and LAHEURTE, Pascal and ACQUIER, P. and JOGUET, David and PELTIER, Laurent and PETITHORY, Tatiana and ANSELME, Karine and MILLE, Pierre},
	abstract = {Biocompatible beta-titanium alloys such as Ti-27.5(at.%)Nb are good candidates for implantology and arthroplasty applications as their particular mechanical properties, including low Young’s modulus, could significantly reduce the stress-shielding phenomenon usually occurring after surgery. The CLAD® process is a powder blown additive manufacturing process that allows the manufacture of patient specific (i.e. custom) implants. Thus, the use of Ti-27.5(at.%)Nb alloy formed by CLAD® process for biomedical applications as a mean to increase cytocompatibility and mechanical biocompatibility was investigated in this study. The microstructural properties of the CLAD-deposited alloy were studied with optical microscopy and electron back-scattered diffraction (EBSD) analysis. The conservation of the mechanical properties of the Ti-27.5Nb material after the transformation steps (ingot-powder atomisation-CLAD) were verified with tensile tests and appear to remain close to those of reference material. Cytocompatibility of the material and subsequent cell viability tests showed that no cytotoxic elements are released in the medium and that viable cells proliferated well.},
	issn = {0928-4931},
	edition = {Post-print},
	title = {Synthesis and characterization of Ti-27.5Nb alloy made by CLAD® additive manufacturing process for biomedical applications},
	publisher = {Elsevier},
	url = {10.1016/j.msec.2017.02.060}
}

@CONFERENCE{10985-10846,
	address = {Etats-Unis},
	year = {2015},
	author = {MAREAU, Charles and BERBENNI, Stéphane},
	abstract = {The self-consistent scheme is a common homogenization method that was developed to connect local deformation mechanisms to the overall behavior of heterogeneous disordered materials. In the past decades, many efforts have been made to obtain extensions of the self-consistent approximation to the non-linear case. This work focuses on the specific case of heterogeneous materials with an elastic-viscoplastic behavior. For such materials, the overall behavior is strongly dependent on the space-time couplings originating from the differential form of the local constitutive law. Different approaches have thus been developed to describe the impact of such complex couplings on the overall behavior. (...)},
	issn = {0232-3869},
	edition = {Pre-print},
	title = {Self-consistent modelling of heterogeneous materials with an elastic-viscoplastic behavior: Application to polycrystalline agregates},
	publisher = {Otto-von-Guericke-Universität},
	url = {http://hdl.handle.net/10985/10846}
}

@CONFERENCE{10985-10844,
	address = {France},
	year = {2014},
	author = {MAREAU, Charles and BERBENNI, Stéphane},
	abstract = {La méthode autocohérente [1] est un des outils permettant de faire le lien entre les mécanismes de déformation à l'échelle locale et le comportement macroscopique effectif. Si la méthode autocohérente a été initialement développée pour des comportements locaux linéaires, des extensions ont été proposées pour différentes classes de comportements non-linéaires : élastoplasticité [2] et viscoplasticité [3]. (...)},
	edition = {Pre-print},
	title = {Modélisation autocohérente des matériaux hétérogènes élasto-viscoplastiques: une approche à champs translatés},
	url = {http://hdl.handle.net/10985/10844}
}

@ARTICLE{10985-10098,
	journal = {International Journal of Plasticity},
	volume = {36},
	pages = {130-147},
	year = {2012},
	author = {PIOTROWSKI, Boris and BEN ZINEB, Tarak and PATOOR, Etienne and EBERHARDT, André},
	abstract = {Commercial Ni 47Ti 44Nb9 Shape Memory Alloy (SMA) is generally adopted for tightening applications thanks to its wide transformation hysteresis, compared with classical NiTi. Its sensibility to thermo-mechanical treatments allows it to be either martensitic or austenitic in a wide range of temperature, between -60 °C and 80 °C. A modeling of niobium precipitates effects on Ni 47Ti 44Nb9 SMA behavior is proposed. For this object, a two phase thermo-mechanical model is developed. It describes the global effective behavior of an elastoplastic inclusion (niobium precipitates) embedded within an SMA matrix. The constitutive law developed by Peultier et al. (2006) and improved by Chemisky et al. (2011) is adopted to model the matrix shape memory behavior. The elastoplastic constitutive law for inclusion is the one proposed by Wilkins with Simo and Hughes's radial return algorithm. The Mori-Tanaka scale transition scheme is considered for the determination of the effective constitutive equations. Obtained results highlight the effect of niobium precipitates on the thermomechanical behavior of Ni47Ti 44Nb9, and particularly on the corresponding hysteresis size. It appears that the niobium plasticity increases this hysteresis size. The developed constitutive law has been implemented in the ABAQUS Finite Element code and considered for the numerical prediction of the tightening pressure in a connection application},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Modeling of niobium precipitates effect on the Ni 47Ti 44Nb 9 Shape Memory Alloy behavior},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2012.03.004}
}

@CONFERENCE{10985-11137,
	address = {Grèce},
	year = {2016},
	author = {TSALIS, Dimitrios and CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas},
	abstract = {In this paper we present a multi-step homogenization scheme of a tube made of numerous wavy cylindrical layers exhibiting periodicity with respect to both the radial and the angular direction. The proposed homogenization is a combination of successive semi-analytical, cell-problem-based, homogenization steps and a possible, micromechanics-based, homogenization in the interior of every layer. Every step of cell-problem based homogenization gives analytical expressions for the homogenized stiffness, thermal expansion and thermal conductivity.},
	edition = {Post-print},
	title = {Multi-Step Homogenization of Thermoelastic Multi-Scale Tubes with Wavy Layers},
	publisher = {National Technical University of Athens},
	url = {http://hdl.handle.net/10985/11137}
}

@ARTICLE{10985-10024,
	journal = {European Journal of Mechanics - A/Solids},
	volume = {54},
	pages = {53-73},
	year = {2015},
	author = {HALDAR, Krishnendu and CHATZIGEORGIOU, George and LAGOUDAS, Dimitris},
	abstract = {Magnetic Shape Memory Alloys (MSMAs) have been the subject of much research in recent years as potential high-actuation-energy multifunctional materials. In this work we analyze coupled magneto-mechanical stability analysis of a variant reorientation mechanism for a single crystal based on a proposed 3-D magneto-mechanically coupled constitutive equations, derived in a consistent thermodynamic way. Discrete symmetry is considered to take into account single crystal anisotropy in the modeling. Analytical results are presented to demonstrate the influence of coupling and anisotropy in the stability of such a material system. Finally, a coupled Boundary Value Problem (BVP) using finite element analysis is performed by considering actual specimen geometry and boundary conditions that are used in the experiments. The numerical simulation reveals localization zones in the solutions due to the loss of ellipticity of the coupled magneto-mechanical problem.},
	issn = {0997-7538},
	edition = {Post-print},
	title = {Single crystal anisotropy and coupled stability analysis for variant reorientation in Magnetic Shape Memory Alloys},
	publisher = {Elsevier},
	url = {10.1016/j.euromechsol.2015.06.005}
}

@ARTICLE{10985-8225,
	journal = {Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering},
	volume = {29},
	pages = {177-181},
	year = {2013},
	author = {XU, Fan and LI, Xin and DEFAUCHY, Denis and REGNIER, Gilles},
	abstract = {In order to study the coalescence mechanisms of thermoplastic polymer powders, a 2D mathematical model has been established based on Frenkel, Eshelby and Pokluda’s model. Sintering experiments have been carried out by using two polyamide fibers that can be considered as infinite cylinders with its length much larger than the diameter. 2D mathematical model has been validated through comparison with results of sintering experiments as well as Constrained Natural Element Method (C-NEM) coalescence simulation. This consistence shows that the proposed coalescence model and experimental results can provide a reference for the numerical simulation of sintering process.},
	edition = {Post-print},
	title = {Coalescence modeling and experimental validation of sintering of thermoplastic polyamide fibers},
	url = {http://hdl.handle.net/10985/8225}
}

@ARTICLE{10985-10364,
	journal = {GAMM-Mitteilungen},
	volume = {38},
	pages = {285-312},
	year = {2015},
	author = {JAVILI, Ali and CHATZIGEORGIOU, George and MCBRIDE, Andrew T. and STEINMANN, Paul and LINDER, Christian},
	abstract = {The objective of this contribution is to establish a first-order computational homogenization framework for micro-to-macro transitions of porous media that accounts for the size effects through the consideration of surface elasticity at the microscale. Although the classical (first-order) homogenization schemes are well established, they are not capable of capturing the well-known size effects in nano-porous materials. In this contribution we introduce surface elasticity as a remedy to account for size effects within a first-order homogenization scheme. This proposition is based on the fact that surfaces are no longer negligible at small scales. Following a standard first-order homogenization ansatz on the microscopic motion in terms of the macroscopic motion, a Hill-type averaging condition is used to link the two scales. The averaging theorems are revisited and generalized to account for surfaces. In the absence of surface energy this generalized framework reduces to classical homogenization. The influence of the length scale is elucidated via a series of numerical examples performed using the finite element method. The numerical results are compared against the analytical ones at small strains for tetragonal and hexagonal microstructures. Furthermore, numerical results at small strains are compared with those at finite strains for both microstructures. Finally, it is shown that there exists an upper bound for the material response of nano-porous media. This finding surprisingly restricts the notion of “smaller is stronger”.},
	issn = {0936-7195},
	edition = {Post-print},
	title = {Computational homogenization of nano-materials accounting for size effects via surface elasticity},
	number = {2},
	url = {10.1002/gamm.201510016}
}

@ARTICLE{10985-10840,
	journal = {Mathematics and Mechanics of Solids},
	pages = {28p.},
	year = {2015},
	author = {TSALIS, Dimitrios and BONNAY, Kevin and CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas},
	abstract = {In this paper, the analytical solution of the multi - step homogenization problem for multi - rank composites with generalized periodicity made of elastic materials is presented. The proposed homogenization scheme may be combined with computational homogenization for solving more complex microstructures. Three numerical examples are presented, concerning locally periodic stratified materials, matrices with wavy layers and wavy fiber reinforced composites.},
	issn = {1081-2865},
	edition = {Post-print},
	title = {Effective properties of multiphase composites made of elastic materials with hierarchical structure},
	publisher = {SAGE Publications},
	url = {10.1177/1081286515612142}
}

@ARTICLE{10985-11177,
	journal = {Composites Part B: Engineering},
	volume = {99},
	pages = {173-187},
	year = {2016},
	author = {TSALIS, Dimitrios and CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas},
	abstract = {In the present article, the homogenization of a composite star-shaped tube with numerous thin, periodic, elastic wavy layers, is presented. The composite exhibits a multiscale periodicity allowing for a multistep asymptotic homogenization scheme starting from the finest scale. The scheme gives the complete effective thermoelastic behavior of the composite. By a numerical example of a two-phase composite with sinusoidal wavy walls, whose effective behavior is an orthotropic material, the above method is illustrated.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Effective behavior of thermo-elastic tubes with wavy layers},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2016.05.043}
}

@ARTICLE{10985-10009,
	journal = {Acta Mechanica},
	pages = {60p.},
	year = {2015},
	author = {LESTER, Brian and BAXEVANIS, Theocaris and CHEMISKY, Yves and LAGOUDAS, Dimitris},
	abstract = {Following their discovery in the early 60's, there has been a continuous quest for ways to take advantage of the extraordinary properties of shape memory alloys (SMAs). These intermetallic alloys can be extremely compliant while retaining the strength of metals and can convert thermal energy to mechanical work. The unique properties of SMAs result from a reversible difussionless solid-to-solid phase transformation from austenite to martensite. The integration of SMAs into composite structures has resulted in many benefits, which include actuation, vibration control, damping, sensing, and self-healing. However, despite substantial research in this area, a comparable adoption of SMA composites by industry has not yet been realized. This discrepancy between academic research and commercial interest is largely associated with the material complexity that includes strong thermomechanical coupling, large inelastic deformations, and variable thermoelastic properties. Nonetheless, as SMAs are becoming increasingly accepted in engineering applications, a similar trend for SMA composites is expected in aerospace, automotive, and energy conversion and storage related applications. In an effort to aid in this endeavor, a comprehensive overview of advances with regard to SMA composites and devices utilizing them is pursued in this paper. Emphasis is placed on identifying the characteristic responses and properties of these material systems as well as on comparing the various modeling methodologies for describing their response. Furthermore, the paper concludes with a discussion of future research efforts that may have the greatest impact on promoting the development of SMA composites and their implementation in multifunctional structures.},
	issn = {0001-5970},
	edition = {Post-print},
	title = {Review and Perspectives: Shape Memory Alloy Composite Systems},
	publisher = {Springer Verlag},
	url = {http://hdl.handle.net/10985/10009}
}

@ARTICLE{10985-16042,
	journal = {Materials Science and Engineering: C},
	volume = {74},
	pages = {399-409},
	year = {2017},
	author = {DIDIER, Paul and PIOTROWSKI, Boris and FISCHER, Marie and LAHEURTE, Pascal},
	abstract = {The advent of new manufacturing technologies such as additive manufacturing deeply impacts the approach for the design of medical devices. It is now possible to design custom-made implants based on medical imaging, with complex anatomic shape, and to manufacture them. In this study, two geometrical configurations of implant devices are studied, standard and anatomical. The comparison highlights the drawbacks of the standard configuration, which requires a specific forming by plastic strain in order to be adapted to the patient’s morphology and induces stress field in bones without mechanical load in the implant. The influence of low elastic modulus of the materials on stress distribution is investigated. Two biocompatible alloys having the ability to be used with SLM additive manufacturing are considered, commercial Ti-6Al-4V and Ti-26Nb. It is shown that beyond the geometrical aspect, mechanical compatibility between implants and bones can be significantly improved with the modulus of Ti-26Nb implants compared with the Ti-6Al-4V.},
	issn = {0928-4931},
	edition = {Post-print},
	title = {Mechanical stability of custom-made implants: Numerical study of anatomical device and low elastic Young's modulus alloy},
	publisher = {Elsevier},
	url = {10.1016/j.msec.2016.12.031}
}

@ARTICLE{10985-10051,
	journal = {Soft Materials},
	volume = {12},
	pages = {S142-S151},
	year = {2014},
	author = {DAVYDOV, Denis and VOYIATZIS, Evangelos and CHATZIGEORGIOU, George and LIU, Shengyuan and STEINMANN, Paul and BOHM, Michael C. and MULLER-PLATHE, Florian},
	abstract = {Size effects in a system composed of a polymer matrix with a single silica nanoparticle are studied using molecular dynamics and surface-enhanced continuum approaches. The dependence of the composite’s mechanical properties on the nanoparticle’s radius was examined. Mean values of the elastic moduli obtained using molecular dynamics were found to be lower than those of the polystyrene matrix alone. The surface-enhanced continuum theory produced a satisfactory fit of macroscopic stresses developing during relaxation due to the interface tension and uniaxial deformation. Neither analytical nor finite-element solutions correlated well with the size-effect in elastic moduli predicted by the molecular dynamics simulations.},
	issn = {1539-445X},
	edition = {Post-print},
	title = {Size Effects in a Silica-Polystyrene Nanocomposite: Molecular Dynamics and Surface-enhanced Continuum Approaches},
	number = {Supplement 1},
	publisher = {Taylor \& Francis},
	url = {10.1080/1539445X.2014.959597}
}

@ARTICLE{10985-6556,
	year = {2011},
	author = {MOLINARI, Alain and CHERIGUENE, Rachid and MIGUELEZ, Henar},
	abstract = {The response of the tool–chip interface is characterized in the orthogonal cutting process by numerical and analytical means and compared to experimental results. We study the link between local parameters (chip temperature, sliding friction coefficient, tool geometry) and overall friction characteristics depicting the global response of the tool–chip interface. Sticking and sliding contact regimes are described. The overall friction characteristics of the tool are represented by two quantities: (i) the mean friction coefficient qualifies the global response of the tool rake face (tool edge excluded) and (ii) the apparent friction coefficient reflects the overall response of the entire tool face, the effect of the edge radius being included. When sticking contact is dominant the mean friction coefficient is shown to be essentially the ratio of the average shear flow stress along the sticking zone by the average normal stress along the contact zone. The dependence of overall friction characteristics is analyzed with respect to tool geometry and cutting conditions. The differences between mean friction and apparent friction are quantified. It is demonstrated that the evolutions of the apparent and of the mean friction coefficients are essentially controlled by thermal effects. Constitutive relationships are proposed which depict the overall friction characteristics as functions of the maximum chip temperature along the rake face. This approach offers a simple way for describing the effect of cutting conditions on the tool–chip interface response. Finally, the contact length and contact forces are analyzed. Throughout the paper, the consistency between numerical, analytical and experimental results is systematically checked.},
	edition = {Post-print},
	title = {Numerical and analytical modeling of orthogonal cutting : The link between local variables and global contact characteristics},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2010.12.007}
}

@ARTICLE{10985-9869,
	journal = {Comptes Rendus Physique},
	volume = {13},
	pages = {280-292},
	year = {2012},
	author = {MALARD, Benoît and SITTNER, Petr and PATOOR, Etienne and BERVEILLER, Sophie},
	abstract = {This article deals with the application of several X-ray and neutron diffraction methods to investigate the mechanics of a stress induced martensitic transformation in Cu-based shape memory alloy polycrystals. It puts experimental results obtained by two different research groups on different length scales into context with the mechanics of stress induced martensitic transformation in polycrystalline environment.},
	issn = {1631-0705},
	edition = {Post-print},
	title = {Advances in martensitic transformations in Cu-based shape memory alloys achieved by in situ neutron and synchrotron X-ray diffraction methods},
	publisher = {Centre Mersenne},
	url = {10.1016/j.crhy.2011.12.003}
}

@ARTICLE{10985-9899,
	journal = {Applied Thermal Engineering},
	volume = {89},
	pages = {394–404},
	year = {2015},
	author = {ARTOZOUL, Julien and DUDZINSKI, Daniel and LESCALIER, Christophe},
	abstract = {Metal cutting is a highly complex thermo-mechanical process. The knowledge of temperature in the chip forming zone is essential to understand it. Conventional experimental methods such as thermocouples only provide global information which is incompatible with the high stress and temperature gradients met in the chip forming zone. Field measurements are essential to understand the localized thermo-mechanical problem. An experimental protocol has been developed using advanced infrared imaging in order to measure temperature distribution in both the tool and the chip during an orthogonal or oblique cutting operation. It also provides several information on the chip formation process such as some geometrical characteristics (tool-chip contact length, chip thickness, primary shear angle) and thermo-mechanical information (heat flux dissipated in deformation zone, local interface heat partition ratio). A study is carried out on the effects of cutting conditions i.e. cutting speed, feed and depth of cut on the temperature distribution along the contact zone for an elementary operation. An analytical thermal model has been developed to process experimental data and access more information i.e. local stress or heat flux distribution.},
	issn = {1359-4311},
	edition = {Post-print},
	title = {Experimental and analytical combined thermal approach for local tribological understanding in metal cutting},
	publisher = {Elsevier},
	url = {10.1016/j.applthermaleng.2015.06.013}
}

@CONFERENCE{10985-9868,
	address = {Espagne},
	isbn = {978-84-932064-6-8},
	pages = {19-24},
	booktitle = {Proceedings of the 9th International Conference on High Speed Machining},
	year = {2012},
	author = {ARTOZOUL, Julien and BOMONT, Olivier and LESCALIER, Christophe},
	abstract = {The temperature at the tool-chip interface is a good estimator of the chip formation and the mechanics taking place in the cutting area. The temperature could be used as an image of the shear stress and the knowledge of the temperature can give a lot of information on cutting phenomena. Global measured value can give a clue on the local understanding of cutting but a field measurement is a way to obtain a lot more information. Conventional experimental methods as thermocouple reached their limits when trying to obtain a temperature distribution at the very contact zone. An experimental protocol has been developed using advanced infrared imaging technology in order to measure temperature distribution in both the tool and the chip during an orthogonal or oblique cutting operation. This setup also allows the estimation of several information on the chip formation so as geometrical characteristics (tool-chip contact length, chip thickness, primary shear angle) and thermo-mechanical information (heat flux dissipated in deformation zone, local interface heat balance). A study has been carried out on the effect of cutting conditions as cutting speed, feed and depth of cut on the temperature distribution along the contact zone for an elementary operation as orthogonal or oblique cutting. Once the temperature distribution is known it is possible through an analytical model to deduce other information and especially on the contact tribological conditions as local stress, or heat flux repartition. This paper presents the capability of such an experimental setup and the influence of the cutting conditions and the possible further development.},
	edition = {Post-print},
	title = {Experimental investigation of the temperature and stress distribution in tool-chip contact zone},
	url = {http://hdl.handle.net/10985/9868}
}

@ARTICLE{10985-9598,
	journal = {Journal of Materials Science},
	volume = {50},
	pages = {2532–2543},
	year = {2015},
	author = {GZYL, Michal and ROSOCHOWSKI, Andrzej and BOCZKAL, Sonia and OLEJNIK, Lech and PESCI, Raphaël},
	abstract = {The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.},
	issn = {0022-2461},
	edition = {Post-print},
	title = {In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy},
	publisher = {Springer Verlag},
	url = {10.1007/s10853-014-8812-0}
}

@ARTICLE{10985-9620,
	journal = {Journal of Theoretical and Applied Mechanics},
	volume = {48},
	pages = {1027-1042},
	year = {2010},
	author = {RUSINEK, Alexis and RODRIGUEZ-MARTINEZ, José A. and CAPELLE, Julien and PESCI, Raphaël},
	abstract = {In this investigation, thermo-viscoplastic behaviour of austenitic steel AISI 304 has been characterised in tension under wide ranges of strain rate at room temperature. This metal possesses an elevated strain hardening rate and ductility which enhance its capability for absorbing energy under mechanical loading. It has been observed that the rate sensitivity of the material is independent of plastic strain. Moreover, it has been noticed that beyond a certain level of loading rate the flow stress of the material sharply increases. In agreement with experimental evidences reported in the literature, this behaviour is assumed to be caused by the drag deformation mode taking place at high strain rates. Based on such considerations, the thermo-viscoplastic behaviour of the material has been macroscopically modelled by means of the extended Rusinek-Klepaczko model to viscous drag effects. Satisfactory matching has been found between the experiments and analytical predictions provided by the constitutive relation.},
	issn = {1429-2955},
	edition = {Post-print},
	title = {Experimental characterisation and modelling of the thermo-viscoplastic behaviour of steel AISI 304 within wide ranges of strain rate at room temperature},
	number = {4},
	publisher = {Polish Society of theoretical and applied Mechanics},
	url = {http://hdl.handle.net/10985/9620}
}

@CONFERENCE{10985-11096,
	address = {Pologne},
	year = {2011},
	author = {ZAERA, Ramon and CASADO, Alvaro and RODRIGUEZ-MARTINEZ, José Antonio and RUSINEK, Alexis and FERNANDEZ-SAEZ, José and PESCI, Raphaël},
	abstract = {This work presents a constitutive model for metastable austenitic steels exhibiting Strain Induced Martensitic Transformation (SIMT). Based on the description of the kinetics of phase transformation proposed by Olson and Cohen [3], and later generalized to 3D by Stringfellow et al. [7] and Papatriantafillou et al. [4], this model includes the effect of temperature increase on the kinetics of SIMT and on the thermal softening of the phases. This allows capturing relevant phenomena exhibited by metastable austenitic steels when subjected to plastic deformation at high strain rates. A systematic procedure for the identification of the constitutive parameters has been proposed. The predictions of the constitutive description are compared with experiments for the austenitic steel AISI 304 provided by Rodríguez-Martínez et al. [6]. Good correlation between experiments and modelling are achieved in terms of macroscopic strain-stress curves and volume fraction of martensite formed during straining.},
	edition = {Post-print},
	title = {Numerical simulation of the effect of adiabatic temperature increase in martensitic transformation of austenitic steels},
	url = {http://hdl.handle.net/10985/11096}
}

@CONFERENCE{10985-11054,
	address = {Pologne},
	year = {2011},
	author = {ZAERA, Ramon and CASADO, Alvaro and RODRIGUEZ-MARTINEZ, José A. and RUSINEK, Alexis and FERNANDEZ-SAEZ, José and PESCI, Raphaël},
	abstract = {The predictions of the constitutive model agree with experimental results in terms of macroscopy stress-strain curves and volume fraction of martensite formed during loading},
	edition = {Post-print},
	title = {Numerical Simulation of the effect adiabatic temperature increase in martensitic transformation of austenitic steels},
	url = {http://hdl.handle.net/10985/11054}
}

@ARTICLE{10985-9614,
	journal = {International Journal of Impact Engineering},
	volume = {79},
	pages = {83-94},
	year = {2015},
	author = {KPENYIGBA, K. M. and JANKOWIAK, Tomasz and RUSINEK, Alexis and WANG, Bin and PESCI, Raphaël},
	abstract = {In this paper an experimental and numerical work is reported concerning the process of perforation of thin steel plates using different projectile nose shapes. The main goal is to analyze how the projectile shape may change the ballistic properties of materials. A wide range of impact velocities from 35 to 180 m/s has been covered during the tests. All the projectiles were 13 mm in diameter and the targets were 1 mm thick, as such the projectile can be regarded as rigid and the target sheets were of interstitial free (IF) steel. The mass ratio (projectile mass/steel sheet mass) and the ratio between the span of the steel sheet and the diameter of the projectile were kept constant, equal to 0.38 and 3.85 respectively. To define the thermoviscoplastic behavior of the target material, the Rusinek-Klepaczko (RK) constitutive model [1] was used. The complete identification of the material constants was done based on a rigorous material characterization. Numerical simulations of some experimental tests were carried out using a non-linear finite element code ABAQUS/Explicit. It was found that the numerical models are able to describe the physical mechanisms in the perforation process with a good accuracy.},
	issn = {0734-743X},
	edition = {Post-print},
	title = {Effect of projectile nose shape on ballistic resistance of interstitial-free steel sheets},
	publisher = {Elsevier},
	url = {10.1016/j.ijimpeng.2014.10.007}
}

@ARTICLE{10985-10994,
	journal = {Thin-Walled Structures},
	volume = {104},
	pages = {126-134},
	year = {2016},
	author = {BOUFFIOUX, Chantal and BOMAN, Romain and CAILLET, Nicolas and PONTHOT, Jean-Philippe and HABRAKEN, Anne-Marie and PESCI, Raphaël},
	abstract = {Sheet piles are produced by hot rolling, a cooling step and, if required, by a straightening operation. Numerical simulations indicate that the stress field is almost homogeneous through the thickness, justifying the comparison of X-ray diffraction, ring core and the sectioning methods applied after the cooling step and after the straightening process. The equipment, the steps of the experimental procedures and the results are detailed, showing the limits, the specificities and the advantages of each method. Moreover, the amplitude and the distribution of the stresses along the width of the sections present good agreement with results of numerical simulations.},
	issn = {0263-8231},
	edition = {Post-print},
	title = {Comparison of residual stresses on long rolled profiles measured by X-ray diffraction,ring core and the sectioning methods and simulated by FE method},
	publisher = {Elsevier},
	url = {10.1016/j.tws.2016.03.017}
}

@ARTICLE{10985-9858,
	journal = {Materials Science and Engineering: A},
	volume = {528},
	pages = {5974-5982},
	year = {2011},
	author = {RODRIGUEZ-MARTINEZ, J. A. and RUSINEK, Alexis and PESCI, Raphaël},
	abstract = {In this work, the martensitic transformation occurring in AISI 304 steel sheets subjected to tension at room temperature has been experimentally studied. Tensile tests performed on AISI 304 specimens are split into two different types; in situ tensile tests and macroscopic tensile tests. The former are conducted mounting the sample in a tensile micromachine originally developed in ENSAM/Metz within the range of strain rates 10-5 s-1≤̇≤10-3 s-1. The latter are performed under static and dynamic conditions of deformation within the range of strain rates 10-3 s-1≤̇≤102 s-1. Using X-rays diffraction technique, in situ tensile tests have allowed measuring the stress of the phases during loading by placing the tensile micromachine under the range of a PROTO goniometer. Additionally, the martensitic transformation has been recorded via mounting the tensile micromachine into a scanning electron microscope. The volume fraction of martensite has been measured in the post mortem specimens, Vα′≈70%. Moreover, the static macroscopic tensile tests, 10-3 s-1≤̇≤10-1 s-1, have been recorded using a high speed infrared camera. It has been proven that martensitic transformation takes place in AISI 304 steel for a temperature increase over ΔT>140K. The macroscopic dynamic tensile tests are performed within the range of strain rates, 1 s-1≤̇≤100 s-1. A considerable amount of martensite has been detected in the post mortem samples, Vα′≈35%. This proves that plastic deformation is the dominant mechanism responsible for the transformation phenomenon in this steel. The free energy supplied by straining the sample relegates to a secondary role the rise in temperature taking place during the course of plastic deformation.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Experimental study on the martensitic transformation in AISI 304 steel sheets subjected to tension under wide ranges of strain rate at room temperature},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2011.04.030}
}

@CONFERENCE{10985-10997,
	address = {Espagne},
	year = {2015},
	author = {CAER, Célia and PESCI, Raphaël},
	abstract = {Finally, the same in situ biaxial tensile tests were also performed with both SEM and XRD, first at low temperature in order to study the influence of temperature on the material behaviour and especially on martensite formation, and then on the same steel that was heat treated in order to increase its grain size and to study the grain size effect.},
	edition = {Post-print},
	title = {Phase transformation in AISI 304 stainless steel during in situ biaxial loading in SEM and with X-ray diffraction},
	url = {http://hdl.handle.net/10985/10997}
}

@ARTICLE{10985-11191,
	journal = {Journal of Materials Processing Technology},
	volume = {236},
	pages = {204-215},
	year = {2016},
	author = {DESAIGUES, Jean-Edouard and BOMONT-ARZUR, Anne and DUDZINSKI, Daniel and BOMONT, Olivier and LESCALIER, Christophe},
	abstract = {Machinability of high-strength steels can be improved without degrading the mechanical properties using metallurgical solutions to create or retain non-metallic inclusions. Such a metallurgical treatment usually leads, during machining, to the appearance of so-called Built-Up Layers (BULs) or transfer layers on the cutting tool. These BULs protect the tool against wear, and longer tool life or better productivity is achieved. Formation of such BULs on the cutting tool depends on many parameters i.e. tool geometry, tool material, cutting conditions. This paper proposes an experimental methodology to identify and describe BUL occurring on the tool rake face. Machining tests were carried out with a high strength free-cutting steel using an untested AlSiTiN coated carbide tool. BULs morphology and composition were determined for various cutting conditions. Temperature distributions at the tool-chip interface were measured during the cutting tests using an infrared camera. BUL appearance was then linked to the thermo-mechanical conditions at the tool-chip interface.},
	issn = {0924-0136},
	edition = {Post-print},
	title = {Experimental study of Built-Up Layer formation during machining of High Strength free cutting steel},
	publisher = {Elsevier},
	url = {10.1016/j.jmatprotec.2016.05.016}
}

@ARTICLE{10985-6557,
	year = {2012},
	author = {RODRIGUEZ MARTINEZ, José Antonio and RUSINEK, Alexis and ARIAS, Angel and ZAERA, Ramon and PEDROCHE, David Arias and PESCI, Raphaël},
	abstract = {This paper presents and analyzes the behaviour of TRIP 1000 steel sheets subjected to low velocity perforation by conical projectiles. The relevance of this material resides in the potential transformation of retained austenite to martensite during impact loading. This process leads to an increase in strength and ductility of the material. However, this transformation takes place only under certain loading conditions strongly dependent on the initial temperature and deformation rate. In order to study the material behaviour under impact loading, perforation tests have been performed using a drop weight tower. Experiments were carried out at two different initial temperatures T0 213 K and T0 288 K, and within the range of impact velocities 2.5 m/s 6 V0 6 4.5 m/s. The experimental setup enabled the measuring of impact velocity, residual velocity, load time history and failure mode. In addition, dry and lubricated contacts between the striker and the plate have been investigated. Finally, by using X ray diffraction it has been shown that no martensitic transformation takes place during the perforation process. The causes involving the none appearance of martensite are examined.},
	edition = {Post-print},
	title = {Thermo-mechanical behaviour of TRIP 1000 steel sheets subjected to low velocity perforation by conical projectiles at different temperatures},
	publisher = {Elsevier},
	url = {10.1016/j.ijsolstr.2010.01.013}
}

@CONFERENCE{10985-9937,
	address = {Allemagne},
	pages = {270-277},
	booktitle = {Proceedings of the Tenth International Conference on High Speed Machining - Progress in Productivity and Quality},
	year = {2013},
	author = {DESAIGUES, Jean-Edouard and BOMONT-ARZUR, Anne and BOMONT, Olivier and LESCALIER, Christophe},
	abstract = {For many decades ArcelorMittal has been developing solutions to enhance machinability of high strength steels for automotive parts. Many well-known metallurgical solutions create or retain inclusions in the metal and then promote machinability without decreasing the mechanical characteristics. Such metallurgical treatment usually leads to the formation of so-called Built-Up Layers (BUL) or transfer layers on the cutting tool while machining. The tool wear rate decreases and thus allows a longer tool life or a better productivity. The existence of such BUL on the cutting tool depends on many parameters i.e. tool geometry, tool material, cutting parameters… There is a growing need in the automotive industry for lighter parts. This has led to a global trend to develop new steel grades with higher mechanical properties. ArcelorMittal is currently developing new metallurgical solutions to optimize steel grades to ensure a better machinability thus preventing productivity losses. BUL characteristics are being studied for the most important machining operations. This paper summarizes the main developments in steel machinability for many decades. Some results from research works into turning and drilling highlight the benefits of these new steels.},
	edition = {Post-print},
	title = {High Strength Steel solutions for automotive parts : State of the art of machinability enhancement and further developments},
	publisher = {Technische Universität Darmstadt},
	url = {http://hdl.handle.net/10985/9937}
}

@ARTICLE{10985-9900,
	journal = {Applied Thermal Engineering},
	volume = {64},
	pages = {441-452},
	year = {2014},
	author = {ARTOZOUL, Julien and BOMONT, Olivier and DUDZINSKI, Daniel and LESCALIER, Christophe},
	abstract = {The temperature knowledge is essential to understand and model the phenomena involved in metal cutting. A global measured value can only provide a clue of the heat generation during the process; however the deep understanding of the thermal aspects of cutting requires temperature field measurement. This paper focuses on infrared thermography applied to orthogonal cutting and enlightens an original experimental setup. A lot of information were directly measured or post-processed. These were mainly focused on the geometrical or thermo mechanical aspects of chip formation, i.e. tool-chip contact length, chip thickness, primary shear angle, heat flux generated in the shear or friction zones, and tool-chip interface temperature distribution. This paper proposes an experimental setup and post-processing techniques enabling to provide numerous, fundamental and original information about the metal cutting process. Some comparisons between collected data and previous experimental or theoretical results were made.},
	issn = {1359-4311},
	edition = {Post-print},
	title = {Extended infrared thermography applied to orthogonal cutting},
	number = {1-2},
	publisher = {Elsevier},
	url = {10.1016/j.applthermaleng.2013.12.057}
}

@CONFERENCE{10985-9942,
	address = {France},
	volume = {996},
	pages = {45-51},
	booktitle = {Advanced Materials Research},
	year = {2014},
	author = {BOUSCAUD, Denis and PATOOR, Etienne and MORAWIEC, Adam and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {The Kossel microdiffraction in a scanning electron microscope allows for local stress determination. This technique has been applied to monitor stress evolution within grains of austenite in the course of martensitic transformation in a shape memory alloy. Kossel diffraction patterns were recorded during in situ tensile straining of Cu-Al-Be alloy. These innovative measurements show large stress heterogeneities between grains, with the stress ratio exceeding two. As martensite variants are stress-induced, shear stress components appear in individual grains of austenite.},
	issn = {1662-8985},
	edition = {Post-print},
	title = {Local stress analysis in an SMA during stress-induced martensitic transformation by Kossel microdiffraction},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/AMR.996.45}
}

@CONFERENCE{10985-9905,
	address = {France},
	isbn = {978-2-9534170-2-9},
	pages = {102-107},
	booktitle = {Proceedings of the Eighth International Conference on High Speed Machining},
	year = {2010},
	author = {BOMONT, Olivier and BOMONT-ARZUR, Anne and LESCALIER, Christophe},
	abstract = {This paper focuses on machinability especially in drilling. It is usually estimated experimentally based on thrust force and torque measurements, chip morphology analysis, surface quality and tool wear tests. A specific experimental procedure has been developed and tested for many steel grades. However wear tests are probably the most critical point. Wear tests are essential for an industrial application since they lead to know the cost per hole nevertheless they are highly time and work material consuming. Wear pattern and wear rate depend on the thermo mechanical stresses exerted on the cutting tool in the contact zones. A mechanistic approach enables to estimate the mechanical stress distribution along the drill lip. A new observer based on the mechanical thrust and force measurements is proposed to estimate stress distribution dissymmetry and rapidly rank the machinability in drilling. His relevancy is checked for several steel grades and drilling conditions: metallurgical structure and hardness are different, cutting material and coating and cutting conditions vary. Experiments are performed without lubricant.},
	edition = {Post-print},
	title = {Machinability in drilling : mechanistic approach and new observer development},
	publisher = {ENIM Editions},
	url = {http://hdl.handle.net/10985/9905}
}

@ARTICLE{10985-9270,
	journal = {International Journal of Plasticity},
	volume = {29},
	pages = {77-101},
	year = {2012},
	author = {ZAERA, Ramon and RODRIGUEZ-MARTINEZ, J. A. and CASADO, Ana Maria and FERNANDEZ-SAEZ, José and RUSINEK, Alexis and PESCI, Raphaël},
	abstract = {This study presents a constitutive model for steels exhibiting SIMT, based on previous seminal works, and the corresponding methodology to estimate their parameters. The model includes temperature effects in the phase transformation kinetics, and in the softening of each solid phase through the use of a homogenization technique. The model was validated with experimental results of dynamic tensile tests on AISI 304 sheet steel specimens, and their predictions correlate well with the experimental evidence in terms of macroscopic stress–strain curves and martensite volume fraction formed at high strain rates. The work shows the value of considering temperature effects in the modeling of metastable austenitic steels submitted to impact conditions. Regarding most of the works reported in the literature on SIMT, modeling of the martensitic transformation at high strain rates is the distinctive feature of the present paper.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2011.08.003}
}

@ARTICLE{10985-7806,
	journal = {International Journal of Solids and Structures},
	volume = {50},
	pages = {339-351},
	year = {2013},
	author = {RODRIGUEZ MARTINEZ, José Antonio and RUSINEK, Alexis and ZAERA, Ramon and PESCI, Raphaël},
	abstract = {In this work, an experimental and numerical analysis of the martensitic transformation in AISI 304 steel sheets subjected to perforation by conical and hemispherical projectiles is conducted. Experiments are performed using a pneumatic gas gun for with the impact velocities in the range of 35 m=s < V0 < 200 m=s. Two target thicknesses are examined, t1 ¼ 0:5 mm and t2 ¼ 1:0 mm. The experimental setup enabled the determination of the impact velocity, the residual velocity and the failure mode of the steel sheets. The effect of the projectile nose shape on the target’s capacity for energy absorption is evaluated. Moreover, martensite is detected in all the impacted samples, and the role played by the projectile nose shape on the transformation is highlighted. A three-dimensional model is developed in ABAQUS/Explicit to simulate the perforation tests. The material is defined via the constitutive model developed by Zaera et al. (2012) to describe the strain-induced martensitic transformation occurring in metastable austenitic steels at high strain rates. The finite element results are compared with the experimental evidence, and satisfactory matching is observed over the entire range of impact velocities tested and for both projectile configurations and target thicknesses considered. The numerical model succeeds in describing the perforation mechanisms associated with each projectile-target configuration analyzed. The roles played by impact velocity, target thickness and projectile nose shape on the martensitic transformation are properly captured.},
	issn = {0020-7683},
	edition = {Post-print},
	title = {Experimental and numerical analysis on the martensitic transformation in AISI 304 steel sheets subjected to perforation by conical and hemispherical projectiles},
	number = {2},
	publisher = {Elsevier},
	url = {10.1016/j.ijsolstr.2012.09.019}
}

@ARTICLE{10985-9628,
	journal = {Thin-Walled Structures},
	volume = {48},
	pages = {966-978},
	year = {2010},
	author = {RODRIGUEZ-MARTINEZ, J. A. and RUSINEK, Alexis and PESCI, Raphaël},
	abstract = {This paper presents and analyzes the behaviour of AISI 304 steel sheets subjected to perforation under a wide range of impact velocities. The relevance of this steel resides in the potential transformation of austenite into martensite during mechanical loading. This process leads to an increase in strength and ductility of the material. It makes the AISI 304 attractive for many engineering applications, especially for building structural elements responsible for absorbing energy under fast loading. However, this transformation takes place only under determined loading conditions strongly dependent on initial temperature and deformation rate. In order to study the material behaviour under impact loading, perforation tests have been performed at room temperature using both, a drop weight tower and a pneumatic gas gun within the range of impact velocities 2.5 m/s≤V0≤85 m/s. The results are compared with those reported in [18] and [21] for ES steel and TRIP 1000 steel. The comparison highlights the good performance of the AISI 304 under high loading rates. Martensitic transformation taking place in this steel during perforation is identified responsible for such behaviour.},
	issn = {0263-8231},
	edition = {Post-print},
	title = {Experimental survey on the behaviour of AISI 304 steel sheets subjected to perforation},
	number = {12},
	publisher = {Elsevier},
	url = {10.1016/j.tws.2010.07.005}
}

@ARTICLE{10985-9278,
	journal = {Journal of Applied Polymer Science},
	volume = {47},
	pages = {1699-1707},
	year = {2014},
	author = {BOUSCAUD, Denis and MORAWIEC, Adam and PATOOR, Etienne and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {Kossel microdiffraction in a scanning electron microscope enables determination of local elastic strains. With Kossel patterns recorded by a CCD camera and some automation of the strain determination process, this technique may become a convenient tool for analysis of strains. As for all strain determination methods, critical for the applicability of the Kossel technique is its strain resolution. The resolution was estimated in a number of ways: from the simplest tests based on simulated patterns (of an Ni alloy), through analysis of sharp experimental patterns of Ge, to estimates obtained by in situ tensile straining of single crystals of the Ni-based superalloy. In the latter case, the results were compared with those of conventional X-ray diffraction and synchrotron-based Kossel diffraction. In the case of high-quality Ge patterns, a resolution of 1 × 10-4was reached for all strain tensor components; this corresponds to a stress of about 10 MPa. With relatively diffuse patterns from the strained Ni-based superalloy, under the assumption of plane stress, the strain and stress resolutions were 3 × 10-4and 60 MPa, respectively. Experimental and computational conditions for achieving these resolutions are described. The study shows potential perspectives and limits of the applicability of semiautomatic Kossel microdiffraction as a method of local strain determination.},
	issn = {0021-8995},
	edition = {Post-print},
	title = {Strain resolution of scanning electron microscopy based Kossel microdiffraction},
	number = {5},
	publisher = {Wiley},
	url = {10.1107/S1600576714019402}
}

@ARTICLE{10985-9567,
	journal = {Journal of Materials Science},
	volume = {50},
	pages = {2532-2543},
	year = {2015},
	author = {GZYL, Michal and ROSOCHOWSKI, Andrzej and BOCZKAL, Sonia and OLEJNIK, Lech and PESCI, Raphaël},
	abstract = {The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.},
	issn = {0022-2461},
	edition = {Post-print},
	title = {In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy},
	number = {6},
	publisher = {Springer Verlag},
	url = {10.1007/s10853-014-8812-0}
}

@ARTICLE{10985-9619,
	journal = {Steel and Composite Structures},
	volume = {16},
	pages = {595-609},
	year = {2014},
	author = {JANKOWIAK, Tomasz and RUSINEK, Alexis and KPENYIGBA, K. M. and PESCI, Raphaël},
	abstract = {The paper is reporting some comparisons between experimental and numerical results in terms of failure mode, failure time and ballistic properties of mild steel sheet. Several projectile shapes have been considered to take into account the stress triaxiality effect on the failure mode during impact, penetration and perforation. The initial and residual velocities as well as the failure time have been measured during the tests to estimate more physical quantities. It has to be noticed that the failure time was defined using a High Speed Camera (HSC). Thanks to it, the impact forces (average and maximum level), were analyzed using numerical simulations together with an analytical description coupled to experimental observations. The key point of the model is the consideration of a shape function to define the pulse loading during perforation.},
	issn = {1229-9367},
	edition = {Pre-print},
	title = {Ballistic behavior of steel sheet subjected to impact and perforation},
	number = {6},
	publisher = {Techno-press},
	url = {10.12989/scs.2014.16.6.595}
}

@ARTICLE{10985-7856,
	journal = {Journal of the mechanical behavior of biomedical materials},
	volume = {9},
	pages = {34-44},
	year = {2012},
	author = {BARBAS, Alexandre and BONNET, Anne-Sophie and LIPINSKI, Paul and DUBOIS, Guillaume and PESCI, Raphaël},
	abstract = {Commercially Pure Porous Titanium (CPPTi) can be used for surgical implants to avoid the stress shielding effect due to the mismatch between the mechanical properties of titanium and bone. Most researchers in this area deal with randomly distributed pores or simple architectures in titanium alloys. The control of porosity, pore size and distribution is necessary to obtain implants with mechanical properties close to those of bone and to ensure their osseointegration. The aim of the present work was therefore to develop and characterize such a specific porous structure. First of all, the properties of titanium made by Selective Laser Melting (SLM) were characterized through experimental testing on bulk specimens. An elementary pattern of the porous structure was then designed to mimic the orthotropic properties of the human bone following several mechanical and geometrical criteria. Finite Element Analysis (FEA) was used to optimize the pattern. A porosity of 53% and pore sizes in the range of 860 to 1500 μm were finally adopted. Tensile tests on porous samples were then carried out to validate the properties obtained numerically and identif the failure modes of the samples. Finally, FE elastoplastic analyses were performed on the porous samples in order to propose a failure criterion for the design of porous substitutes.},
	issn = {1751-6161},
	edition = {Post-print},
	title = {Development and mechanical characterization of porous titanium bone substitutes},
	publisher = {Elsevier},
	url = {10.1016/j.jmbbm.2012.01.008}
}

@ARTICLE{10985-7804,
	journal = {Thin-Walled Structures},
	volume = {65},
	pages = {93-104},
	year = {2013},
	author = {KPENYIGBA, K. M. and JANKOWIAK, Tomasz and RUSINEK, Alexis and PESCI, Raphaël},
	abstract = {The paper describes a work focused on the process of perforation of steel sheet.Experimental,analytical and numerical investigations have been carried out to analyze in details the perforation process.Based on these approaches,the ballistic properties of the material and the failure modes depending on the projectile nose shape(conical,blunt or hemispherical) have been studied.Different failure modes have been observed,including petaling, plug ejection and circumference necking.The special study about the number of petals has been done for different nose angles using conical shape projectiles.The complete energy balance is also reported and the absorbed energy by the steel sheet has been obtained by measuring initial and residual projectile velocities.A wide range of impact velocities from 35to180m/s has been covered during the tests.All the projectiles are 13mm in diameter and the plates are1mm thick.Moreover,the mass ratio(projectile mass/steel sheet mass) and the ratio between the span of the steel sheet and the diameter of the projectile are constant, equal to 0.38 and 3.85, respectively.},
	issn = {0263-8231},
	edition = {Post-print},
	title = {Influence of projectile shape on dynamic behavior of steel sheet subjected to impact and perforation},
	publisher = {Elsevier},
	url = {10.1016/j.tws.2013.01.003}
}

@ARTICLE{10985-10325,
	isbn = {978-303785085-5},
	journal = {Materials Science Forum},
	volume = {681},
	pages = {243-248},
	year = {2011},
	author = {OUAHAB, Razane and PATOOR, Etienne and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {In this study, the internal stress evolution of the ferrite phase of 16MND5-A508 has been determined using X-Ray Diffraction (XRD). The results of in situ tests combined with XRD analyses and performed at different temperatures (-150°C and 22°C) exhibit a difference of about 200MPa between the macroscopic stress and the ferrite one. The stress state in the cementite is determined by a mixture law; it reaches very high values up to 9000MPa. These results highlight the need to analyze the stress directly in the cementite phase by using appropriate tools, since its volume fraction does not allow it using XRD.},
	issn = {0255-5476},
	edition = {Post-print},
	title = {Influence of temperature on stress distribution in bainitic steels -Application to 16MND5-A508 pressure vessel steel},
	publisher = {Trans Tech Publications Inc},
	url = {10.4028/www.scientific.net/MSF.681.243}
}

@ARTICLE{10985-7858,
	journal = {Materials Science and Engineering: A},
	volume = {561},
	pages = {67-77},
	year = {2013},
	author = {TAUPIN, Vincent and BERBENNI, Stéphane and OUAHAB, Razane and BOUAZIZ, Olivier and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {In situ tensile tests were performed at room temperature on a ferrite–cementite steel specifically designed for this study. The evolution of the average stress in ferrite during loading was analyzed by X-ray diffraction.Lattice strain measurements were performed with synchrotron ring diffraction in both ferrite and cementite.These in situ tests were complemented by macroscopic tensile and reversible tensile-compression tests to study the Bauschinger effect. In order to reproduce stresses in ferrite and cementite particles,a recently developed micromechanical Internal Length Mean Field (ILMF) model based on a generalized self-consistent scheme is applied. In this designed ferrite–cementite steel,the third ‘‘phase’’of the model represents finite intermediate‘‘layers’’in ferrite due to large geometrically necessary dislocation (GND) densities around cementite particles. The assumed constant thickness of the layers is calibrated thanks to the obtained experimental data.The ILMF model is validated by realistic estimates of the Bauschinger stress and the large difference between mean stresses in ferrite and in cementite phases.This difference cannot be reproduced by classic two-phase homogenization schemes without intermediate GND layers.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Lattice strain measurements using synchrotron diffraction to calibrate a micromechanical modeling in a ferrite–cementite steel},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2012.10.086}
}

@ARTICLE{10985-7800,
	journal = {Ultramicroscopy},
	volume = {115},
	pages = {115-119},
	year = {2012},
	author = {BOUSCAUD, Denis and PATOOR, Etienne and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {A Kossel microdiffraction experimental setup has been developed inside a Scanning Electron Micro-scope for crystallographic orientation, strain and stress determination at a micrometer scale. This paper reports an estimation of copper and germanium specimens heating due to the electron beam bombardment. The temperature rise is calculated from precise lattice parameters measurement considering different currents induced in the specimens. The spatial resolution of the technique is then deduced.},
	issn = {0304-3991},
	edition = {Post-print},
	title = {Estimation of the electron beam-induced specimen heating and the emitted X-rays spatial resolution by Kossel microdiffraction in a scanning electron microscope},
	publisher = {Elsevier},
	url = {10.1016/j.ultramic.2012.01.018}
}

@CONFERENCE{10985-11055,
	address = {Pologne},
	year = {2010},
	author = {RODRIGUEZ-MARTINEZ, José A. and RUSINEK, Alexis and ARIAS, Angel and PESCI, Raphaël},
	abstract = {In this investigation, the thermo-viscoplastic behaviour of the steel AISI 304 has been examined. The experimental characterization of the material has been conducted in tension under wide ranges of strain rates.An analytical description of the macroscopic behaviour of this metal is reported. For such goal, the extended Rusinek-Klepaczko model to viscous drag effects is applied.It allows for proper description of the material behaviour within the whole range of loading conditions considered.In addition, the analytical formulation proposed gathers limited number of material constants and simple calibration procedure.},
	edition = {Post-print},
	title = {Mechanical charecterization and analytical modeling of the thermo-viscoplastic behaviour AISI 304 steel under wide ranges of strain rates at room temperature},
	url = {http://hdl.handle.net/10985/11055}
}

@MISC{10985-10120,
	address = {France},
	year = {2015},
	author = {BOMONT, Olivier and WARY, Marc and BIANCHIN, Jeremy and SIMON, Lionel and BOEHM, Daniel and HECKER, Jean-Michel and PEIFFERT, Xavier and PESCI, Raphaël},
	abstract = {L'invention concerne une micromachine de traction destinée à être utilisée dans une enceinte de microscope électronique à balayage ou avec un appareil de diffraction, comportant deux mors (1) portés par deux supports, chaque mors (1) étant destiné à recevoir une extrémité d'une éprouvette mécanique (4), et des moyens pour exercer sur les supports des efforts tendant à les écarter l'un de l'autre ou à les rapprocher l'un de l'autre selon une direction longitudinale (AL), chaque mors (1) comprenant une embase (2) et une bride (3) pour fixer une extrémité (21) d'éprouvette (4) au mors (1) en l'enserrant entre la bride (3) et l'embase (2) au moyen d'au moins deux vis (12-15 ) traversant chacune la bride (3) et au moins une partie de l'embase (2), ces deux vis (12-15) étant situées de part et d'autre de l'extrémité d'éprouvette (21).},
	edition = {Post-print},
	title = {Micromachine d'essais mécaniques de type traction et compression ayant une accessibilité optimisée},
	url = {http://hdl.handle.net/10985/10120}
}

@ARTICLE{10985-9268,
	journal = {Metallurgical and Materials Transactions A},
	volume = {45},
	pages = {1609-1620},
	year = {2014},
	author = {GZYL, Michal and ROSOCHOWSKI, Andrzej and OLEJNIK, Lech and YAKUSHINA, Evgenia and WOOD, Paul and PESCI, Raphaël},
	abstract = {Incremental equal channel angular pressing (I-ECAP) is a severe plastic deformation process used to refine grain size of metals, which allows processing very long billets. As described in the current article, an AZ31B magnesium alloy was processed for the first time by three different routes of I-ECAP, namely, A, BC, and C, at 523 K (250 C). The structure of the material was homogenized and refined to ∼5 microns of the average grain size, irrespective of the route used. Mechanical properties of the I-ECAPed samples in tension and compression were investigated. Strong influence of the processing route on yield and fracture behavior of the material was established. It was found that texture controls the mechanical properties of AZ31B magnesium alloy subjected to I-ECAP. SEM and OM techniques were used to obtain microstructural images of the I-ECAPed samples subjected to tension and compression. Increased ductility after I-ECAP was attributed to twinning suppression and facilitation of slip on basal plane. Shear bands were revealed in the samples processed by I-ECAP and subjected to tension. Tension-compression yield stress asymmetry in the samples tested along extrusion direction was suppressed in the material processed by routes BC and C. This effect was attributed to textural development and microstructural homogenization. Twinning activities in fine- and coarse-grained samples have also been studied.},
	issn = {1073-5623},
	edition = {Post-print},
	title = {Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP},
	number = {3},
	publisher = {Springer Verlag/ASM International},
	url = {10.1007/s11661-013-2094-z}
}

@ARTICLE{10985-11801,
	journal = {Journal of the mechanical behavior of biomedical materials},
	volume = {74},
	pages = {43-53},
	year = {2017},
	author = {CRISTOFARI, François and PIOTROWSKI, Boris and PESCI, Raphaël},
	abstract = {Nanoporous membranes are used for the elaboration of implantable medical devices. In order to guaranty their integrity after implantation in a patient body, it is necessary to characterize the microstructure and the mechanical behavior of such membranes. They present randomly distributed pores around 1 µm in diameter at the surface. X-ray nanotomography permits to get the geometry of the pores through the thickness with a reduction of the diameter in the core. A multiscale study is done to characterize the membranes: macroscopic tensile tests permit to get the behavior law of the non porous material and in situ tensile tests are carried on in a Scanning Electron Microscope in order to observe the evolution of pores and cracks during loading. A 2D Finite Element Model is also developed in parallel. The confrontation between experiments and numerical simulations permit to validate the accuracy of the model. The latter is then used to simulate several types of loadings considering various pore distributions and sizes.},
	issn = {1751-6161},
	edition = {Post-print},
	title = {Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation},
	publisher = {Elsevier},
	url = {10.1016/j.jmbbm.2017.05.021}
}

@ARTICLE{10985-11601,
	journal = {Materials Science and Engineering: A},
	volume = {690},
	pages = {44-51},
	year = {2017},
	author = {CAER, Célia and PESCI, Raphaël},
	abstract = {The microstructural response of a coarse grained AISI 304 stainless steel submitted to biaxial tensile loading was investigated using SEM and X-ray diffraction. The specimen geometry was designed to allow for biaxial stress state and incipient crack in the center of the active part under biaxial tensile loading. This complex loading was performed step by step by a micromachine fitting into a SEM chamber. At each loading step FSD pictures and EBSD measurements were carried out to study the microstructural evolution of the alloy, namely grain rotations and misorientations, stress-induced martensite formation and crack propagation. According to their initial orientation, grains are found to behave differently under loading. Approximately 60% of grains are shown to reorient to the [110] Z orientation under biaxial tensile loading, whereas the 40% left undergo high plastic deformation. EBSD and XRD measurements respectively performed under loading and on the postmortem specimen highlighted the formation of about 4% of martensite.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Local behavior of an AISI 304 stainless steel submitted to in situ biaxial loading in SEM},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2017.02.087}
}

@ARTICLE{10985-7720,
	journal = {Journal of Electronic Materials},
	volume = {42},
	pages = {492-501},
	year = {2013},
	author = {SADIQ, Muhammad and CHERKAOUI, Mohammed and PESCI, Raphaël},
	abstract = {An extensive study is made to analyze the impact of pure lanthanum on the microstructure and mechanical properties of Sn-Ag-Cu (SAC) alloys at high temperatures. Different compositions are tested; the temperature applied for the isothermal aging is 150 C, and aging times of 10 h, 25 h, 50 h, 100 h, and 200 h are studied. Optical microscopy with cross-polarized light is used to follow the grain size, which is refined from 8 mm to 1 mm for as-cast samples and is maintained during thermal aging. Intermetallic compounds (IMCs) present inside the bulk Sn matrix affect the mechanical properties of the SAC alloys. Due to high-temperature exposure, these IMCs grow and hence their impact on mechanical properties becomes more significant. This growth is followed by scanning electron microscopy, and energy-dispersive spectroscopy is used for elemental mapping of each phase. A significant refinement in the average size of IMCs of up to 40% is identified for the as-cast samples, and the coarsening rate of these IMCs is slowed by up to 70% with no change in the interparticle spacing. Yield stress and tensile strength are determined through tensile testing at 20 C for as-cast samples and after thermal aging at 150 C for 100 h and 200h. Both yield stress and tensile strength are increased by up to 20% by minute lanthanum doping.},
	issn = {0361-5235},
	edition = {Post-print},
	title = {Impact of Thermal Aging on the Microstructure Evolution and Mechanical Properties of Lanthanum-Doped Tin-Silver-Copper Lead-Free Solders},
	number = {3},
	publisher = {Institute of Electrical and Electronics Engineers},
	url = {10.1007/s11664-012-2351-8}
}

@ARTICLE{10985-10323,
	journal = {Materials Science Forum},
	volume = {681},
	pages = {1-6},
	year = {2011},
	author = {BOUSCAUD, Denis and PATOOR, Etienne and BERVEILLER, Sophie and PESCI, Raphaël},
	abstract = {A Kossel microdiffraction experimental set up is under development inside a Scanning Electron Microscope (SEM) in order to determine the crystallographic orientation as well as the inter- and intragranular strains and stresses. An area of about one cubic micrometer can be analysed using the microscope probe, which enables to study different kinds of elements such as a grain boundary, a crack, a microelectronic component, etc. The diffraction pattern is recorded by a high resolution Charge-Coupled Device (CCD) camera. The crystallographic orientation, the lattice parameters and the elastic strain tensor of the probed area are deduced from the pattern indexation using a homemade software. The purpose of this paper is to report some results achieved up to now to estimate the reliability of the Kossel microdiffraction technique.},
	issn = {0255-5476},
	edition = {Post-print},
	title = {Stress analysis by Kossel microdiffraction on a nickel-based single crystal superalloy during an in situ tensile test – Comparison with classical X-Ray diffraction},
	publisher = {Trans Tech Publications Inc},
	url = {10.4028/www.scientific.net/MSF.681.1}
}

@ARTICLE{10985-7955,
	journal = {Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences},
	volume = {468},
	pages = {3601-3619},
	year = {2012},
	author = {LARIBOU, Hicham and FRESSENGEAS, Claude and ENTEMEYER, Denis and JEANCLAUDE, Veronique and TAZIBT, Abdel and PESCI, Raphaël},
	abstract = {The technology of nitrogen jets impacting surfaces at low temperature has recently been introduced for surface cleaning/stripping. Under the impact of the jet, the material surface undergoes a thermomechanical shock inducing complex transformation mechanisms. Depending on the material and test parameters such as standoff distance, dwell time, upstream pressure, the latter include cleavage, cracking, spalling, blistering, grain fragmentation, phase transformation and ductile deformation. Quite often, these modes are superimposed in the same test, or even in the same material area. In this study, an overview of these mechanisms is proposed for metallic materials. Measurements of thermomechanical variables in the impacted area are presented and the influence of the test parameters on surface transformation is investigated. Grain fragmentation and ultrafast transport of nitrogen in a deep layer below the surface are explored.},
	issn = {1364-5021},
	edition = {Post-print},
	title = {Effects of the impact of a low temperature nitrogen jet on metallic surfaces},
	publisher = {Royal Society, The},
	url = {10.1098/rspa.2012.0241}
}

@ARTICLE{10985-9949,
	journal = {Composites Part B: Engineering},
	volume = {58},
	pages = {487-495},
	year = {2014},
	author = {ARIF, Muhamad Fatikul and CHEMISKY, Yves and DESPRINGRE, Nicolas and ROBERT, Gilles and MERAGHNI, Fodil},
	abstract = {Damage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (lCT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber–matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber–matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, matrix microcracks appear and grow regardless the RH contents. For RH = 100%, these microcracks are also accompanied by many matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2013.11.001}
}

@CONFERENCE{10985-11996,
	address = {France},
	year = {2017},
	author = {POMAREDE, Pascal and DELALANDE, Stéphane and DECLERCQ, Nico Felicien and MERAGHNI, Fodil},
	abstract = {Un composite polyamide 66/6 renforcé par un tissu à armature sergée de 2,2 en fibres de verres a été étudié par une méthode ultrasonore avancée. Les mécanismes d’endommagement de ce type de matériau dépendent de la nature de sollicitation et de l’architecture du renfort, en particulier de l’orientation des fibres. Dans ce travail, une sollicitation en traction a été considérée pour deux configurations d’orientation des éprouvettes : (i) orientée suivant la direction d’écoulement (sens du renfort chaine) et (ii) orientée à 45° de celle-ci. Différents niveaux d’endommagement ont été induis pour ces deux configurations d’échantillons, jusqu’à des niveaux proches de la rupture. Une première estimation de l’endommagement est obtenue à travers la baisse du module d’élasticité et sert de référence. Pour chaque niveau d’endommagement, une méthode ultrasonore de mesure du tenseur de rigidité est ensuite utilisée sur chaque échantillon. Un schéma différent d’évolution anisotrope de l’endommagement a été observé pour chaque configuration d’échantillon. A partir des signaux obtenus par mesure ultrasonore, un nouvel indicateur d’endommagement a été proposé. Cet indicateur est basé sur la mesure de déphasage du signal ultrasonore par rapport à un signal obtenu sur éprouvette non endommagée. Le nouvel indicateur s’est révélé plus sensible à la dégradation du matériau comparativement à l’indicateur d’endommagement classique fondé sur la réduction du module d’élasticité. Les deux indicateurs ont montré une évolution importante de l’endommagement lors de chargement en traction à 45°de la direction d’écoulement gouverné par un mode de cisaillement.},
	edition = {Post-print},
	title = {Détection et suivi de l’endommagement anisotrope par méthode ultrasonore dans un composite à renfort tissé et matrice polyamide PA 66/6},
	url = {http://hdl.handle.net/10985/11996}
}

@CONFERENCE{10985-11999,
	address = {France},
	year = {2017},
	author = {TIKARROUCHINE, El-Hadi and CHATZIGEORGIOU, George and PIOTROWSKI, Boris and CHEMISKY, Yves and PRAUD, Francis and MERAGHNI, Fodil},
	abstract = {Dans ce papier, une technique de modélisation multi-échelle (EF2) basée sur le principe d’homogénéisation périodique a été développée pour décrire le comportement des structures composites 3D avec un comportement élastoviscoplastique des endommageable. L’approche proposée permet de simuler le comportement macroscopique non linéaire d’un composite à microstructure périodique à partir d’un calcul EF sur sa cellule unitaire, elle-même alimentée par les lois de comportement de chacun de ses constituants. La méthode introduit ainsi le concept de méta modèle. Le principal avantage de cette méthode est de s’affranchir totalement des limitations sur les lois de comportement locales, ainsi que les lois constitutives à l’échelle macroscopique ne sont pas nécessaire La mise en œuvre numérique de cette stratégie a été réalisée dans ABAQUS Implicit. Enfin l’approche a été validée sur macro-structure 3D sur laquelle, une cellule unitaire est affectée à chaque point d’intégration.},
	edition = {Post-print},
	title = {Modéliation multi-échelle non-linéaire par homogénéisation périodique et analyses par EF2 : application aux composites à matrice elastoviscoplastique endommageable},
	url = {http://hdl.handle.net/10985/11999}
}

@CONFERENCE{10985-11190,
	address = {Russie},
	year = {2013},
	author = {CHEMISKY, Yves and ECHCHORFI, Rachid and BOURGEOIS, Nadine and PIOTROWSKI, Boris and MERAGHNI, Fodil},
	abstract = {In this work, a method for the identification of the transformation surface of Shape Memory Alloys based on full field measurements is presented. An inverse method coupled with a gradient-based algorithm has been developed to determine the characteristic parameters of the transformation surface. The constitutive equations of the chosen model that capture the macroscopic behavior of Shape Memory Alloys are first presented. The material parameters, to be identified, that are characteristic of the tension-compression asymmetry of the alloy are detailed. The identification algorithm, based on full field measurements obtained by Digital Image Correlation (DIC) and numerical simulation by Finite Element Analysis are introduced. The identification algorithm is validated using a numerically generated strain field on a Meuwissen-type specimen.},
	issn = {0255-5476},
	edition = {Post-print},
	title = {Determination of the characteristic parameters of tension-compression asymmetry of Shape Memory Alloys using full-field measurements},
	publisher = {Trans Tech publications},
	url = {10.4028/www.scientific.net/MSF.738-739.281}
}

@CONFERENCE{10985-10496,
	address = {France},
	pages = {10.p},
	booktitle = {Journées Nationales sur les Composites},
	year = {2015},
	author = {DESPRINGRE, Nicolas and CHEMISKY, Yves and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {Cet article présente un modèle micromécanique visco-endommageable pour les composites à matrice thermoplastique renforcée par des fibres de verre courtes et soumis à un chargement en fatigue. L'approche multi-échelles développée est fondée sur la méthode de Mori-Tanaka, modifiée afin d'inclure des inclusions enrobées et l'évolution des mécanismes d'endommagement à l'échelle microscopique. Le modèle développé intègre les cinétiques d'endommagement tout en tenant compte de la viscoélasticité matricielle et de la microstucture. La prise en compte de ces derniers se base sur des travaux précédemment menés par les auteurs sur le PA66/GF30 moulé par injection [3-5]. Des scénarios d'endommagement ont été proposés et regroupent trois mécanismes : la décohésion interfaciale fibre­ matrice, la fissuration matricielle et les ruptures de fibres. Chaque mécanisme d'endommagement est associé à une loi d'évolution dépendant des champs de contraintes à l'échelle microscopique. La loi constitutive du volume élémentaire représentatif est implémentée dans Abaqus en tant qu'User MATerial subroutine. L'identification du modèle se fait par méthodes inverses, bénéficiant ainsi des résultats multi-échelles précédemment obtenus à l'aide de tests in-situ au MEB ou à partir de l'analyse quantitative et qualitative de données issus de la microtomographie. La validation expérimentale est réalisée par des tests en fatigue contrôlés en déformation.},
	edition = {Post-print},
	title = {Endommagement en fatigue du PA66 renforcé par des fibres de verre courtes : modélisation micromécanique et stratégie d'identification multi - échelles},
	url = {http://hdl.handle.net/10985/10496}
}

@CONFERENCE{10985-10836,
	address = {Danemark},
	year = {2015},
	author = {SHIRINBAYAN, Mohammadali and SUROWIEC, Benjamin and BOCQUET, Michel and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {Advanced Sheet Molding Compound (A-SMC) is a serious composite material candidate for structural automotive parts. It has a thermoset matrix and consists of high weight content of glass fibers (50% in mass) compared to standard SMC with less than 30% weight fiber content. During crash events, structural parts are heavily exposed to high rates of loading and straining. This work is concerned with the development of an advanced experimental approach devoted to the micro and macroscopic characterization of A-SMC mechanical behavior under high-speed tension. High speed tensile test are achieved using servo-hydraulic test equipment in order to get required high strain rates up to 100 s -1 . Local deformation is measured through a contactless technique using a high speed camera. Numerical computations have led to an optimal design of the specimen geometry and the experimental damping systems have been optimised in terms of thickness and material properties. These simulations were achieved using ABAQUS explicit finite element code. The developed experimental methodology is applied for two types of A-SMC: Randomly Oriented fibers (RO) and Highly Oriented fibers (HO) plates. In the case of HO samples, two tensile directions were chosen: HO-0° (parallel to the Mold Flow Direction (MFD)) and HO-90° (perpendicular to the MFD). High speed tensile tests results show that A-SMC behavior is strain-rate dependent although the young’s modulus remains constant with increasing strain rate. In the case of HO-0°, the stress damage threshold is shown an increase of 63%, when the strain rate varies from quasi-static (0.001 s -1 ) to 100 s -1 .},
	edition = {Post-print},
	title = {Micro and macroscopic characterization of A-SMC under high speed tensile test},
	url = {http://hdl.handle.net/10985/10836}
}

@CONFERENCE{10985-11180,
	address = {Canada},
	year = {2016},
	author = {PATOOR, Etienne and MOHARA, Guillaume and CHATZIATHANASIOU, Dimitris and CHEMISKY, Yves and CHATZIGEORGIOU, George and MERAGHNI, Fodil},
	abstract = {A transformation criterion that includes the effect of tension-compression asymmetry and texture-induced anisotropy is used to describe the size of the transformation region surrounding the tip of an edge crack in a shape memory alloy. This analysis is made within the framework of the linear elastic fracture mechanics (LEFM). Different opening modes are considered. Transformation surfaces obtained are compared with those published by Lexcellent et al. (Int. J. Fract. 169: 1-13, 2011) for the isotropic case to capture the influence of transformation anisotropy for different fracture modes.},
	edition = {Post-print},
	title = {Influence of phase transformation anisotropy on transformation surface around a crack tip},
	url = {http://hdl.handle.net/10985/11180}
}

@CONFERENCE{10985-11182,
	address = {Canada},
	year = {2016},
	author = {CHATZIATHANASIOU, Dimitris and CHEMISKY, Yves and CHATZIGEORGIOU, George and MERAGHNI, Fodil},
	abstract = {In this work, a new 3D thermomechanically coupled phenomenological model is proposed for SMAs. SMA behavior is described through several strain mechanisms, each associated with its proper internal variables. Forward and reverse transformation are allowed to take place simultaneously with martensite variants reorientation. This model is built to capture the particular behavior of SMAs when subjected to complex loading, namely non-proportional thermomechanical loading. The effect of thermomechanical coupling, related to dissipation and latent heat is examined by means of conducting simulations under various thermal conditions. The validity of the model is demonstrated by approaching experimental results of complex thermomechanical loading paths of SMA structures.},
	edition = {Post-print},
	title = {Thermomechanically coupled model for non-proportional loading in SMAS},
	url = {http://hdl.handle.net/10985/11182}
}

@ARTICLE{10985-9969,
	journal = {International Journal of Mechanical Sciences},
	volume = {96-97},
	pages = {13-24},
	year = {2015},
	author = {CHEMISKY, Yves and BOURGEOIS, Nadine and CORNELL, Stephen and ECHCHORFI, Rachid and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {With the design of new devices with complex geometry and to take advantage of their large recoverable strains, shape memory alloys components (SMA) are increasingly subjected to multiaxial loadings. The development process of SMA devices requires the prediction of their thermomechanical response, for which the calibration of the material parameters for the numerical model is an important step. In this work, the parameters of a phenomenological model are extracted from tests performed on specimens with non-uniform geometry, which induce heterogeneous strain fields carried out on specimens with the same thermomechanical loading history. The digital image correlation technique is employed to measure the strain fields on the surface of the specimen and to analyze the strain paths of chosen points. Finite element analysis enables the computation of numerical strain fields using a thermodynamical constitutive model for shape memory alloys previously implemented in a finite element code. The strain fields computed numerically are compared with experimental ones obtained by DIC to find the model parameters which best match experimental measurements using a newly developed parallelized mixed genetic/gradient-based optimization algorithm. These numerical simulations are carried out in parallel using a supercomputer to reduce the time necessary to identify the set of model parameters. The major features of this new algorithm is its ability to identify the material parameters which describe the thermomechanical behavior of shape memory alloys from full-field measurements for various loading conditions (different temperatures, multiaxial behavior, heterogeneous test configurations). It is demonstrated that model parameters for the simulation of SMA structures are thus obtained based on a reduced number of heterogeneous tests at different temperatures.},
	issn = {0020-7403},
	edition = {Post-print},
	title = {Analysis of the deformation paths and thermomechanical parameter identification of a shape memory alloy using digital image correlation over heterogeneous tests},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2015.03.007}
}

@CONFERENCE{10985-10268,
	address = {Qatar},
	isbn = {9781119065272},
	pages = {451-459},
	booktitle = {Proceedings of the MEMA 2015},
	year = {2015},
	author = {DESPRINGRE, Nicolas and CHEMISKY, Yves and ROBERT, Gilles and MERAGHNI, Fodil},
	abstract = {This work presents a micromechanical fatigue damage model developed for short glass fiber reinforced PA66. It has been developed to predict the high cycle fatigue behavior of PA66/GF30. The model is based on an extended Mori-Tanaka method which includes coated inclusions, matrix viscoelasticity and the evolution of micro-scale damage. The developed model accounts for the nonlinear matrix viscoelasticity and the reinforcement orientation. The description of the damage processes is based on the experimental investigation of damage mechanisms previously performed through in-situ SEM tests and X-ray micro-computed tomography observations. Damage chronologies have been proposed involving three different processes: interface debonding/coating, matrix micro-cracking and fiber breakages. Their occurrence strongly depends on the microstructure and the relative humidity. Each damage mechanism is introduced through an evolution law coupled to local stress fields. The developed model is implemented using a UMAT subroutine. Its experimental validation is achieved under stress or strain controlled fatigue tests.},
	edition = {Post-print},
	title = {Micromechanical Fatigue Visco-Damage Model for Short Glass Fiber Reinforced Polyamide-66},
	publisher = {Ibrahim Karaman, Raymundo Arróyave and Eyad Masad / Wiley},
	url = {10.1002/9781119090427.ch48}
}

@CONFERENCE{10985-10418,
	address = {Espagne},
	year = {2014},
	author = {ESMAEILLOU, Bardia and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {The objective of this work is to identify and to analyze the main micro-mechanisms which govern the fatigue behavior of a short glass fiber reinforced polyamide 66 composite through a multi-scale experimental analysis. Tension-tension fatigue tests have been performed at different applied maximum stress and have been analyzed at both microscopic and macroscopic scale. Together with the progressive stiffness reduction, the temperature rise due to self-heating during cyclic loading has been measured using an infrared camera. Moreover, SEM fractography observations have been performed to assess the chronology of deformation mechanisms. Two principal mechanisms have been identified: matrix deformation due to self-heating and fiber-matrix interface damage. In addition, localized deformation zones have been observed around the fibers. The evolution of the size of these micro-ductile areas have been statistically related to the maximum applied stress. Finally, a competition between thermal fatigue and mechanical fatigue have been shown according to the loading amplitude.},
	edition = {Post-print},
	title = {Micro-mechanisms of fatigue in short glass fiber reinforced polyamide 66: A multi-scale experimental analysis},
	url = {http://hdl.handle.net/10985/10418}
}

@CONFERENCE{10985-10363,
	address = {Tunisie},
	isbn = {978-3-642-37143-1},
	year = {2013},
	author = {NOURI, Hedi and CZARNOTA, Christophe and MERAGHNI, Fodil},
	abstract = {In the present work, a new polycyclic fatigue damage model is formulated and applied for short glass fibre reinforced thermoplastics. The model is able to capture experimental trends observed for the considered composites. The damage growth description involves a set of 20 parameters in the case of a complete 3D –structure. In the current paper, it is considered the particular case of a displacement controlled fatigue tensile test involving 4 damage parameters. The present contribution is a first approach of parameter identification. It is considered a least squares sense based cost function and homogeneous fatigue tests performed on a short glass fibre reinforced polyamide. The identified set of parameters appears to be not depending on the adopted initial values. The model as the parameters determined by the minimisation algorithm, are validated on a fatigue test performed with a different loading condition.},
	edition = {Post-print},
	title = {Experimental Parameters Identification of Fatigue Damage Model for Short Glass Fiber Reinforced Thermoplastics GFRP},
	publisher = {Haddar, M., Romdhane, L., Louati, J., Ben Amara, A. / Springer},
	url = {10.1007/978-3-642-37143-1_63}
}

@CONFERENCE{10985-11896,
	address = {Mexique},
	year = {2017},
	author = {CHARALAMBAKIS, Nicolas and CHATZIGEORGIOU, George and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {The modern technological challenges on the engineering industry and the extensive advances in the materials science have caused a tremendous increase in the development of composites. Plenty of engineering and biomechanics applications demand smart materials and structures which combine high strength, multifunctionality and durability. At the same time, a crucial parameter in the choice of the most suitable composite material is the long lifetime during repeated loading cycles, thus fatigue is an essential parameter in design. To achieve the high demands in the modern applications, composite materials often operate under thermomechanical conditions that cause the appearance of dissipative phenomena like plasticity, viscoelasticity-viscoplasticity and damage. The present work deals with periodic composite media subjected to fully coupled thermomechanical loading. The material constituents of these composites are assumed to belong in the general class of generalized standard materials laws. The aim is to provide a proper homogenization framework that describes accurately the basic conservation laws in both microscopic and macroscopic levels. The study is based on the asymptotic expansion homogenization technique, which permits to deduce useful results about the energy potentials that characterize the material response in both scales. Moreover, the numerical implementation is based on an incremental, linearized formulation. This formulation allows to identify proper thermomechanical 3D tangent moduli for the macroscale problem and thus design an implicit computational scheme.},
	edition = {Post-print},
	title = {Multiscale modeling of periodic dissipative composites under thermomechanical loading conditions},
	url = {http://hdl.handle.net/10985/11896}
}

@ARTICLE{10985-17521,
	journal = {Continuum Mechanics and Thermodynamics},
	volume = {30},
	pages = {1-51},
	year = {2017},
	author = {CHARALAMBAKIS, Nicolas and CHATZIGEORGIOU, George and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {In this paper, a review of papers on mathematical homogenization of dissipative composites under small strains and on the interplay between homogenization procedure and dissipation due to mechanical work is presented. Moreover, a critical survey on the links between mathematical homogenization and computational homogenization is attempted.},
	issn = {0935-1175},
	edition = {Post-print},
	title = {Mathematical homogenization of inelastic dissipative materials: a survey and recent progress},
	number = {1},
	publisher = {Springer Verlag},
	url = {10.1007/s00161-017-0587-5}
}

@ARTICLE{10985-11136,
	journal = {International Journal of Plasticity},
	volume = {82},
	pages = {192-224},
	year = {2016},
	author = {CHATZIATHANASIOU, Dimitris and CHEMISKY, Yves and CHATZIGEORGIOU, George and MERAGHNI, Fodil},
	abstract = {In the present study, a new 3D thermodynamic coupled model is proposed for SMAs. The behavior of SMA structures is described through several strain mechanisms, each associated with its proper internal variables. This model is built to capture the particular behavior of SMAs when subjected to complex loading, namely non-proportional thermomechanical loading. To achieve this task, a new approach to describe the martensitic reorientation mechanism has been introduced in conjuction with a new method to account for forward and reverse transformation. Thermomechanical coupling, related to dissipation and latent heat is fully implemented. The validity of the model is demonstrated by comparing experimental results of complex thermomechanical loading paths of SMA structures with numerical simulations.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Modeling of coupled phase transformation and reorientation in shape memory alloys under non-proportional thermomechanical loading},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2016.03.005}
}

@ARTICLE{10985-10849,
	journal = {International Journal of Plasticity},
	volume = {81},
	pages = {18-39},
	year = {2016},
	author = {CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {The current work deals with periodic thermomechanical composite media, in which the material constituents are considered to obey the generalized standard materials laws. The aim is to provide a proper homogenization framework that takes into account both the equilibrium and the thermodynamics laws in microscale and macroscale levels. The study is based on the asymptotic expansion homogenization technique, which permits to deduce useful results about the general structure of microscale and macroscale energy potentials and constitutive laws. The paper also proposes an incremental, linearized formulation that allows to identify suitable thermomechanical tangent moduli for the macroscale problem. The capabilities of this framework are illustrated with numerical examples on multilayered composites.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Periodic homogenization for fully coupled thermomechanical modeling of dissipative generalized standard materials},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2016.01.013}
}

@ARTICLE{10985-9970,
	journal = {Shape Memory and Superelasticity},
	volume = {August},
	pages = {1-16},
	year = {2015},
	author = {CHATZIATHANASIOU, Dimitris and CHEMISKY, Yves and CHATZIGEORGIOU, George and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {In the present study, a new transformation criterion that includes the effect of tension–compression asymmetry and texture-induced anisotropy is proposed and combined with a thermodynamical model to describe the thermomechanical behavior of polycrystalline shape memory alloys. An altered Prager criterion has been developed, introducing a general transformation of the axes in the stress space. A convexity analysis of such criterion is included along with an identification strategy aimed at extracting the model parameters related to tension–compression asymmetry and anisotropy. These are identified from a numerical simulation of an SMA polycrystal, using a self-consistent micromechanical model previously developed by Patoor et al. (J Phys IV 6(C1):277–292, 1996) for several loading cases on isotropic, rolled, and drawn textures. Transformation surfaces in the stress and transformation strain spaces are obtained and compared with those predicted by the micromechanical model. The good agreement obtained between the macroscopic and the microscopic polycrystalline simulations states that the proposed criterion and transformation strain evolution equation can capture phenomenologically the effects of texture on anisotropy and asymmetry in SMAs.},
	issn = {2199-384X},
	edition = {Post-print},
	title = {Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity},
	publisher = {Springer},
	url = {10.1007/s40830-015-0027-y}
}

@CONFERENCE{10985-11150,
	address = {Allemagne},
	isbn = {978-3-00-053387-7},
	year = {2016},
	author = {ANAGNOSTOU, Dimitrios and CHATZIGEORGIOU, George and BOUVARD, Jean-Luc and CHEMISKY, Yves and BILLON, Noelle and MERAGHNI, Fodil},
	abstract = {The so-called VENU model is a visco-hyperelastic constitutive model, designed for amorphous rubbery polymers, which is based on an original approach initially developed by N. Billon (J. Appl. Polym. Sci. 125:4390-4401, 2012) and extended by A. Maurel-Pantel et al. (Int. J. Plast. 67:102126, 2015) to three-dimensional thermomechanical framework. In the aforementioned references, the constitutive equations and thermodynamical framework are presented within large deformation theory. However, in fatigue tests of polymeric composites significant temperature gradients are noticed despite the fact that the measured strains are within the small strain theory. In addition, well established techniques and tools of micromechanics for polymeric composites are applicable in small deformation regions. These observations render important the reduction of the VENU model in the case of linear strains. Here, a method is proposed for the reduction of the VENU model to small strain theory. A proper numerical scheme is also provided, based on the so-called return-mapping algorithm. The model capabilities are illustrated by comparing numerical calculations with available experimental data for polyamide 66.},
	edition = {Post-print},
	title = {Linearization and implementation of venu model in small strain theory for polyamide 6.6},
	url = {http://hdl.handle.net/10985/11150}
}

@CONFERENCE{10985-10837,
	address = {Qatar},
	isbn = {978-1-119-06527-2},
	year = {2015},
	author = {CHEMISKY, Yves and BOURGEOIS, Nadine and CORNELL, Stephen and ECHCHORFI, Rachid and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {With the design of new devices with complex geometry and to take advantage of their large recoverable strains, shape memory alloys components (SMA) are increasingly subjected to multiaxial loadings. The development process of SMA devices requires the prediction of their thermomechanical response, where the calibration of the material parameters for the numerical model is an important step. In this work, the parameters of a phenomenological model are extracted from multiaxial and heterogeneous tests carried out on specimens with the same thermomechanical loading history. Finite element analysis enables the computation of numerical strain fields using a thermodynamical constitutive model for shape memory alloys previously implemented in a finite element code. The strain fields computed numerically are compared with experimental ones obtained by DIC to find the model parameters which best matches experimental measurements using a newly developed parallelized mixed genetic/gradient-based optimization algorithm. These numerical simulations are carried out in parallel in a supercomputer to reduce the time necessary to identify the set of identified parameters. The major features of this new algorithm is its ability to identify material parameters of the thermomechanical behavior of shape memory alloys from full-field measurements for various loading conditions (different temperatures, multiaxial behavior, heterogeneous test configurations). It is demonstrated that model parameters for the simulation of SMA structures are thus obtained based on a reduced number of heterogeneous tests at different temperatures.},
	edition = {Post-print},
	title = {Identification of Model Parameter for the Simulation of SMA Structures Using Full Field Measurements},
	publisher = {Ibrahim Karaman, Raymundo Arróyave and Eyad Masad/ Wiley},
	url = {10.1002/9781119090427.ch19}
}

@CONFERENCE{10985-10365,
	address = {Danemark},
	year = {2015},
	author = {ACHOUR-RENAULT, Nadia and PELTIER, Laurent and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {The scope of this work is to provide a microstructural description and an experimental analysis of the strain rate effect on short glass fiber reinforced polypropylene.},
	edition = {Pre-print},
	title = {Microstructural and experimental analysis of strain rate effect for short glass fiber reinforced polypropylene},
	url = {http://hdl.handle.net/10985/10365}
}

@ARTICLE{10985-11994,
	journal = {Mechanics of Materials},
	volume = {114},
	pages = {9-29},
	year = {2017},
	author = {CHATZIGEORGIOU, George and BIKARD, Jérôme and PRAUD, Francis and MERAGHNI, Fodil},
	abstract = {In this work, a phenomenological model for thermoplastic polymers involving several mechanisms is proposed. The constitutive equations lie within the framework of thermodynamics and account for both viscoelasticty, viscoplasticity and ductile damage. An implicit numerical scheme utilizing the “return mapping algorithm” is provided along with the formulation of the tangent operator. The parameters of the developed model are experimentally identified through a gradient-based inverse method using three strain-controlled configurations. The model validation is achieved by comparing numerical results with experimental data obtained on a cyclic loading configuration test. Finally, the capabilities of the proposed model are demonstrated with a series of numerical simulations where complex cyclic and non-proportional loading conditions are applied as well as with a structural FE application.},
	issn = {0167-6636},
	edition = {Post-print},
	title = {Phenomenological multi-mechanisms constitutive modelling for thermoplastic polymers, implicit implementation and experimental validation},
	publisher = {Elsevier},
	url = {10.1016/j.mechmat.2017.07.001}
}

@CONFERENCE{10985-10354,
	address = {Danemark},
	pages = {10p.},
	booktitle = {Proceedings of the ICCM20},
	year = {2015},
	author = {DESPRINGRE, Nicolas and CHEMISKY, Yves and ROBERT, Gilles and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {The paper presents a new micromechanical high cycle fatigue visco-damage model for short glass fiber reinforced thermoplastic composites, namely: PA66/GF30. This material, extensively used for automotive applications, has a specific microstructure which is induced by the injection process. The multi-scale developed approach is a modified Mori-Tanaka method that includes coated reinforcements and the evolution of micro-scale damage processes. The description of the damage processes is based on the experimental investigations of damage mechanisms previously performed by the authors and presented elsewhere [M.F. Arif et al. "In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity." Composites Part B: Engineering, Volume 61: 55-65, 2014]. Damage chronologies have been proposed involving three different local degradation processes: fiber-matrix interface debonding/coating degradation, matrix microcracking and fiber breakage. Their occurrence strongly depends on the microstructure and the moisture content. The developed model integrates these damage kinetics and accounts for the complex matrix viscoelasticity and the reinforcement orientation distributions induced by the process. Each damage mechanism is introduced through an evolution law involving local stress fields computed at the microscale. The developed constitutive law at the representative volume element scale is implemented into the finite element code Abaqus using a User MATerial subroutine. The model identification is performed via reverse engineering, taking advantage of the multiscale experimental results: in-situ SEM tests as well as quantitative and qualitative μCT investigations. Experimental validation is achieved using high cycle strain controlled fatigue tests.},
	edition = {Post-print},
	title = {Fatigue damage in short glass fiber reinforced PA66: Micromechanical modeling and multiscale identification approach},
	url = {http://hdl.handle.net/10985/10354}
}

@CONFERENCE{10985-10419,
	address = {France},
	pages = {2p.},
	booktitle = {JNC 18},
	year = {2013},
	author = {ARIF, Muhamad Fatikul and DESPRINGRE, Nicolas and CHEMISKY, Yves and ROBERT, Gilles and MERAGHNI, Fodil},
	abstract = {Injection molded polyamide composite reinforced with short glass fibers has been widely used in automotive industry due to its high strength to weight ratio and the ability of injection process to produce complex parts. A reliable design of components made of this composite should consider the development of progressive properties degradation due to the damage. A better understanding of the damage mechanisms shall contribute to a better formulation of local damage criteria and thus to include with a higher accuracy the physical modeling of their effects to predict the overall mechanical behavior of the composite. For this purpose, in situ SEM tests were performed to observe the damage mechanisms of injection molded polyamide-66 reinforced with 30%wt of short glass fibers (PA66GF30). The observation was focused on dry as mold state (0% water content) of PA66GF30, which correspond to a relative humidity RH=0%. The specimens were subjected to a flexural load using a three-point bending micro-device and were assembled inside an environmental SEM to allow the in situ observations. Specimens were cut following two specific orientations with respect to the mold flow direction (MFD): longitudinal and transverse. Prior to observation, the surface samples were polished and metalized with gold. As the polyamide absorbs water during polishing, the samples were put after polishing inside a vacuum oven at 80 o C for 15h to ensure that the RH content goes back to zero in the whole sample.},
	edition = {Post-print},
	title = {In situ SEM damage mechanisms investigation of short glass fiber reinforced polyamide composite},
	url = {http://hdl.handle.net/10985/10419}
}

@ARTICLE{10985-11144,
	journal = {Composite Structures},
	volume = {155},
	pages = {77-88},
	year = {2016},
	author = {DESPRINGRE, Nicolas and CHEMISKY, Yves and BONNAY, Kevin and MERAGHNI, Fodil},
	abstract = {A new micromechanical damage model accounting for progressive interface debonding is developed for composite materials. It consists of an original evolution law of the damage at the interface and an appropriate load transfer law at the matrix-fiber interface integrated into a generalized incremental Mori–Tanaka homogenization scheme. The interface damage evolution is driven by the interfacial stress state while the load transfer is obtained from a new model inspired by the shear lag model. Specifically, such damage evolution is supported by experimental microscopic observations for short glass fiber reinforced polyamide-66. The proposed model is validated based on numerical reference solutions provided from finite element analyses of a representative unit cell of a composite, where imperfect interfaces are represented using cohesive elements. A further comparison with experimental data proves that the proposed model is an alternative to micromechanical models involving weak interfaces in the case of spherical reinforcements. It is shown that the proposed model is able to accurately reproduce the non-linear effective response of composite materials for a broad range of reinforcement shapes, including spherical particles and matrix mechanical properties.},
	issn = {0263-8223},
	edition = {Post-print},
	title = {Micromechanical modeling of damage and load transfer in particulate composites with partially debonded interface},
	publisher = {Elsevier},
	url = {10.1016/j.compstruct.2016.06.075}
}

@CONFERENCE{10985-11997,
	address = {France},
	year = {2017},
	author = {CHATZIGEORGIOU, George and CHEMISKY, Yves and PRAUD, Francis and MERAGHNI, Fodil},
	abstract = {Dans ce travail, un modèle micromécanique établi sur le principe de l’homogénéisation périodique est utilisé pour décrire le comportement macroscopique des composites à matrice thermoplastique sous chargements cycliques et non proportionnels. Avec l’approche proposée, le comportement macroscopique du composite est déterminé à partir d’une simulation par éléments finis d’une cellule unitaire représentative de la microstructure en intégrant les lois de comportement spécifiques des constituants : la matrice et les torons. Le comportement de la matrice est modélisé à l’aide d’une loi de comportement présentant un couplage entre viscoélasticité, viscoplasticité et endommagement ductile. Pour les torons, une loi de comportement basée à la fois sur des concepts micromécaniques et phénoménologiques est utilisée. Cette dernière permet de prendre en compte l’endommagement ainsi que l’anélasticité induit par la présence d’un réseau diffus de microfissures. Les capacités du modèle à capturer, à l’échelle macroscopique, les effets temporels induits par la matrice, couplés aux mécanismes d’endommagement intra-torons, sont démontrées à travers plusieurs exemples où le composite est soumis à des chargements cycliques et non proportionnels.},
	edition = {Post-print},
	title = {Modélisation multi-échelle des composites tissés à matrice thermoplastique sous chargements cycliques non proportionnels},
	url = {http://hdl.handle.net/10985/11997}
}

@CONFERENCE{10985-10258,
	address = {Espagne},
	pages = {8p.},
	booktitle = {Proceedings of the 16th European Conference on Composite Materials},
	year = {2014},
	author = {DESPRINGRE, Nicolas and CHEMISKY, Yves and ARIF, Muhamad Fatikul and ROBERT, Gilles and MERAGHNI, Fodil},
	abstract = {This work presents a new micromechanical fatigue damage model for reinforced thermoplastic composites. The study aims at modeling high cycle fatigue damage of a short glass fiber reinforced polyamide-66. The developed approach is a modified Mori-Tanaka method that includes coated reinforcements and microscale damage processes. The model takes into account the nonlinear matrix viscoelasticity and the damage mechanisms evolution. The latter is based on the experimental damage investigation previously performed by the authors and presented elsewhere. Damage chronologies have been proposed involving three different local processes: fiber-matrix interface debonding/coating degradation, matrix microcracking and fiber breakage. Each damage mechanism is introduced through an evolution law coupled to local stress fields computed at the microscale. The first numerical results show capability of the developed model to predict the fatigue damage accumulation of the macroscopic homogenized composite material.},
	edition = {Post-print},
	title = {Multi-scale viscoelastic damage model of short glass fiber reinforced thermoplastics under fatigue loading},
	url = {http://hdl.handle.net/10985/10258}
}

@CONFERENCE{10985-11178,
	address = {Allemagne},
	isbn = {978-3-00-053387-7},
	year = {2016},
	author = {CHATZIGEORGIOU, George and CHEMISKY, Yves and PRAUD, Francis and MERAGHNI, Fodil},
	abstract = {In this paper, a micromechanics model, based on the periodic homogenization method, is utilized to study thermoplastic woven composites. The proposed approach accounts for the microtructure effects and the local behaviour of the matrix accounting for viscoelastic, viscoplastic and damage phenomena. The damage mechanisms occurring into the yarns are modelled through a hybrid micro-phenomenological constitutive law based on the Mori-Tanaka mean field theory. Finally, the model capabilities have been illustrated under both monotonic and oligocyclic loading conditions.},
	edition = {Post-print},
	title = {Micromechanical modelling of viscoelastic-viscoplastic-damage behaviour for polyamide woven fabric composites under cyclic loading.},
	url = {http://hdl.handle.net/10985/11178}
}

@ARTICLE{10985-9967,
	journal = {International Journal of Solids and Structures},
	volume = {69-70},
	pages = {34-44},
	year = {2015},
	author = {MOKARRAM, Hossain and CHATZIGEORGIOU, George and STEINMANN, Paul and MERAGHNI, Fodil},
	abstract = {polymers. In the case of magneto-sensitive polymers, micron-size ferromagnetic particles are mixed with a liquid polymeric matrix in the uncured stage. The polymer curing process is a complex process that transforms a fluid to a solid with time. To transfer the constituent parameter information from the micro-scale to the macro-scale for a composite magneto-mechanically coupled polymeric material, an extended Mori–Tanaka semi-analytic homogenization procedure is utilized. The stiffness gaining phenomenon as in the case of a curing process is realized by time-dependent material parameters appearing within the composite piezomagnetic material tensors. Moreover, to compute the volume reduction during curing, a magnetic induction dependent shrinkage model is proposed. Several numerical examples show that the model proposed herein can capture major observable phenomena in the curing process of polymers under magneto-mechanically coupled infinitesimal deformations.},
	issn = {0020-7683},
	edition = {Post-print},
	title = {A multi-scale approach to model the curing process in magneto-sensitive polymeric materials},
	publisher = {Elsevier},
	url = {10.1016/j.ijsolstr.2015.06.011}
}

@CONFERENCE{10985-10137,
	address = {Qatar},
	isbn = {978-1-11909042-7},
	year = {2015},
	author = {CHATZIATHANASIOU, Dimitris and CHEMISKY, Yves and CHATZIGEORGIOU, George and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {In the present study, a new transformation criterion that includes the effect of tension- compression asymmetry and texture-induced anisotropy is proposed and combined with a thermodynamical model to describe the thermomechanical behavior of polycrystalline shape memory alloys. An altered Prager criterion has been developed, introducing a general transformation of the axes in the stress space. A convexity analysis of such criterion is included along with an identification strategy aimed at extracting the model parameters related to tension-compression asymmetry and anisotropy. These are identified from a numerical simulation of a SMA polycrystal, using a self-consistent micromechanical model previously developed by Patoor et al. (Patoor, E., Eberhardt, A., Berveiller, M., 1996. Micromechanical Modelling of Superelasticity in Shape Memory Alloys. Journal de Physique IV 6, C1 277) for several loading cases on isotropic, rolled and drawn textures. Transformation surfaces in the stress and transformation strain spaces are obtained and compared with those predicted by the micromechanical model. The good agreement obtained between the macroscopic and the microscopic polycrystalline simulations states that the proposed criterion and transformation strain evolution equation can capture phenomenologically the effects of texture on anisotropy and asymmetry in SMAs.},
	edition = {Post-print},
	title = {Phenomenological model for phase transformation characteristics of textured shape memory alloys},
	publisher = {Ibrahim Karaman, Raymundo Arróyave and Eyad Masad/ Wiley},
	url = {10.1002/9781119090427.ch21}
}

@CONFERENCE{10985-11175,
	address = {Allemagne},
	isbn = {978-3-00-053387-7},
	year = {2016},
	author = {CHATZIGEORGIOU, George and CHARALAMBAKIS, Nicolas and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {The current work deals with periodic composite media undergoing fully coupled thermomechanical loading. In these composites the material constituents are considered to obey the generalized standard materials laws. The aim of this research is to provide a proper homogenization framework that describes accurately all set of equations in both microscopic and macroscopic levels. The main tool of the study is the asymptotic expansion homogenization technique, which permits to deduce useful results about the energy potentials and constitutive laws that characterize the material response in both scales. In order to overcome the difficulty that the internal dissipation in the macroscale cannot be split analytically in terms of thermodynamic forces and fluxes, an incremental, linearized formulation is proposed. This formulation allows to identify proper thermomechanical tangent moduli for the macroscale problem and thus design an implicit computational scheme. The capability of this framework is illustrated with a numerical example on multilayered composites undergoing viscoplastic mechanisms.},
	edition = {Post-print},
	title = {Effective properties of dissipative composites under fully coupled thermomechanical processes},
	url = {http://hdl.handle.net/10985/11175}
}

@CONFERENCE{10985-10575,
	address = {Russie},
	year = {2013},
	author = {PIOTROWSKI, Boris and CHEMISKY, Yves and ECHCHORFI, Rachid and BOURGEOIS, Nadine and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {The thermomechanical behavior of Shape Memory Alloys (SMAs) is described by many micromechanical and phenomenological models. The first ones have material parameters whose physical meaning is based on the crystallography of the phase transformation related to the studied alloy. In contrast, phenomenological models often have material parameters whose physical meaning is not obvious and that makes them difficult to identify, some of which are based on mathematical considerations. In this paper, we propose to use the formulation of the phenomenological model of Chemisky et al., and to consider the particular case of a superelastic SMA. In this case, the constitutive equation should be easily expressed analytically through the strain tensor as a function of applied load direction and material parameters. The behavior is then characterized by a complete and proportional loading. This analytical model contains 7 material parameters, 1 related to the elasticity and 6 to the phase transformation. Based on several isothermal tensile tests at various temperatures, material parameters of this model are identified using the Levenberg-Marquardt algorithm and an analytical calculation of the sensitivity matrix. Their physical meaning and their influence on the thermomechanical behavior of the studied alloy are highlighted and discussed.},
	edition = {Post-print},
	title = {Identification and interpretation of material parameters of a shape memory alloy (SMA) model},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/MSF.738-739.276}
}

@CONFERENCE{10985-12140,
	address = {Allemagne},
	year = {2017},
	author = {CHATZIGEORGIOU, George and CHENG, Long and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {Shape memory alloys (SMAs) are exploited in several innovative applications such as biocompatible actuators experiencing up to large number of cyclic loads. However, the description of the SMA cyclic response is still incomplete. The present work is devoted to propose a 3D model based on the thermodynamical coupling of different strain mechanisms such as the forward and reverse phase transformation, the martensitic reorientation, the transformation-introduced plasticity and fatigue damage.},
	edition = {Post-print},
	title = {Constitutive modeling of shape memory alloys incorporating transformation-induced plasticity and damage},
	publisher = {Scheven Malte von; Keip Marc-André; Karajan Nils},
	url = {http://hdl.handle.net/10985/12140}
}

@CONFERENCE{10985-11238,
	address = {Canada},
	year = {2016},
	author = {CHATZIATHANASIOU, Dimitris and BOURGEOIS, Nadine and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {In this work, the influence of the direction and the history of thermomechanical loading of NiTi shape memory alloys on the overall material behavior is experimentally investigated. In the first part, cyclic biaxial mechanical loading has been applied to cross-shaped specimens under constant temperature. The residual strains of selected points from the sample surface are extracted and analyzed. The second part of the study concerns thermomechanical testing of textured samples cut from a laminated plate under complex cyclic loading at different temperature levels. The evolution of residual strains and the transformation threshold are correlated to the history of loading and the amplitude of transformation strain. Anisotropic effects are studied by performing those same experiments on different directions according to the rolling direction of the laminated plate.},
	edition = {Post-print},
	title = {Cyclic loading effects on NITI alloys under biaxial conditions},
	url = {http://hdl.handle.net/10985/11238}
}

@ARTICLE{10985-17636,
	journal = {Composites Part B: Engineering},
	volume = {119},
	pages = {168-183},
	year = {2017},
	author = {MAHBOOB, Zia and CHEMISKY, Yves and BOUGHERARA, Habiba and MERAGHNI, Fodil},
	abstract = {A continuum damage mechanics based mesoscale model is developed within a thermodynamics framework to describe the in-plane tensile response in natural fibre composites. The standard Mesoscale Damage Theory (MDT) is modified to incorporate damage and inelasticity evolution in the fibre-direction, thereby capturing the unique nonlinear fibre-direction response evidenced in natural fibre composites (NFC). The multi-ply damage model is validated using tests on Flax/epoxy laminates and available data on Carbon/epoxy laminates. Model parameters are identified for Flax/epoxy by applying an optimisation algorithm that compares numerical predictions with experimental data. Predictions of mechanical response, stiffness degradation, and inelasticity correlate very well with experimental observations of Flax-laminates. This modified-MDT model offers a predictive, robust tool to aid the development of NFC engineering structures.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Mesoscale modelling of tensile response and damage evolution in natural fibre reinforced laminates},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2017.03.018}
}

@ARTICLE{10985-12296,
	journal = {Composites Part B: Engineering},
	volume = {131},
	pages = {8-20},
	year = {2017},
	author = {SHIRINBAYAN, Mohammadali and ABBASNEZHAD, Navideh and SUROWIEC, Benjamin and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {This paper presents the results of an overall experimental characterization of the mechanical behavior of a Low Density Sheet Molding Compound (LD-SMC). LD-SMC is a polyester matrix containing mineral charge (CaCO3) reinforced by discontinuous bundles of glass fibers and Hollow Glass Microspheres (HGM). After a description of its specific microstructure using several experimental methods (notably a new ultrasonic method), the overall mechanical response of two microstructure configurations (Randomly Oriented (RO) and Highly oriented (HO)) is analyzed at both macroscopic and microscopic scales in the case of tensile and compression tests. HGMs are homogeneously distributed into the overall volume of the material. At the microscopic scale, in-situ tensile tests inside a SEM and fracture surfaces observations allows analyzing the specific damage mechanisms occurring during tensile and compression loading performed in the mold flow direction (HO-0°) and perpendicularly to it (HO-90°). A strong coupled influence of the presence of the HGM and fibers orientation has been emphasized. The results show that for HO-0° configuration fiber-matrix debonding appears to be the predominant damage mechanism, whereas for HO-90° configuration HGM-matrix debonding appears to be the predominant damage mechanism. High speed tensile tests are achieved using servo-hydraulic test equipment in order to study the strain rate effects (until 80 s−1) on mechanical macroscopic responses of HO-0°, RO and HO-90° samples. Strain rate has an obvious influence on the inelastic properties of LD-SMCs samples for all microstructures particularly on the damage threshold.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Mechanical characterization of a Low Density Sheet Molding Compound (LD-SMC): Multi-scale damage analysis and strain rate effect},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2017.08.004}
}

@ARTICLE{10985-9968,
	journal = {Smart Materials and Structures},
	volume = {24},
	pages = {1-17},
	year = {2015},
	author = {CHATZIGEORGIOU, George and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {In the current manuscript, a homogenization framework is proposed for periodic composites with shape memory alloy (SMA) constituents under quasi-static thermomechanical conditions. The methodology is based on the step-by-step periodic homogenization, in which the macroscopic and the microscopic problems of the composite are solved simultaneously. The implementation of the framework is examined with numerical examples on SMA composite laminates. Complexity of the composite nonlinear response and non-proportional stress state in the SMA appears, even in the case of uniaxial macroscopic boundary conditions. Moreover, under certain conditions, the composite laminate can exhibit a non-convex transformation surface. Additionally, the transformation temperatures at various stress levels under isobaric thermal cycling can be quite different between the composite and the pure SMA.},
	issn = {0964-1726},
	edition = {Post-print},
	title = {Computational micro to macro transitions for shape memory alloy composites using periodic homogenization},
	number = {3},
	publisher = {IOP Publishing},
	url = {10.1088/0964-1726/24/3/035009}
}

@ARTICLE{10985-8059,
	journal = {Composites Part B: Engineering},
	volume = {45},
	pages = {1181-1191},
	year = {2012},
	author = {BOCQUET, Michel and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {This study investigates the origin of the strain rate effect on the mechanical behavior of a discontinuous glass fiber reinforced ethylene–propylene copolymer (EPC) matrix composite. This kind of composite materials are commonly used for automotive functional and structural applications. To this aim, a multi-scale experimental approach is developed. The deformation processes and the damage mechanisms observed at the microscopic scale are related to the material mechanical properties at the macroscopic scale. Tensile tests up to failure and specific interrupted tensile tests have been optimized and performed for high strain rates up to 200 s 1 to quantify the strain rate effect at different scales. High speed tensile tests have also been performed on the pure copolymer matrix. The threshold and the kinetic of damage have been quantified at both microscopic and macroscopic scales. Experimental results show that the composite behavior is strongly strain-rate dependent. The multi-scale analysis leads to the conclusion that the strain rate effect on the damage behavior of the EPC matrix composite is mainly due to the viscous behavior of the EPC matrix. SEM observations and analysis show that a localized deformation in the interface zone around fibers occurs at high strain rates and directly affects the visco-damage behavior. It is established that when the strain rate increases, the local deformation zone around the fibers behaves like a dissipation zone. Consequently, the damage initiation is delayed and the related kinetic is reduced with respect to the quasi-static loading case.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Effect of the matrix behavior on the damage of ethylene–propylene glass fiber reinforced composite subjected to high strain rate tension},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2012.06.011}
}

@CONFERENCE{10985-10049,
	address = {Qatar},
	isbn = {9781119090427},
	year = {2015},
	author = {BOUGHERARA, Habiba and EL SAWI, Ihab and FAWAZ, Zouheir and MERAGHNI, Fodil},
	abstract = {The main objective of this preliminary investigation is to identify and characterize the damage evolution of angle ply ([±45] 16 ) flax-reinforced epoxy composites using an energy-based damage model combined with Scanning Electron Microscopy (SEM) observations. The damage model’s parameters for the flax-reinforced epoxy composite were determined from quasi-static and fatigue tests. The preliminary results showed that the energy-based damage model is able predict accurately the damage rate in both longitudinal and transverse directions for loads. The mechanism of damage initiation in the flax/epoxy composites and the damage evolution, during each test, were monitored using SEM. A direct correlation between the microstructure of the flax-reinforced epoxy composites and the damage was obtained.},
	edition = {Post-print},
	title = {Investigation and modeling of the fatigue damage in natural fiber composites},
	publisher = {Ibrahim Karaman, Raymundo Arróyave and Eyad Masad},
	url = {10.1002/9781119090427.ch4}
}

@ARTICLE{10985-12138,
	journal = {Composite Structures},
	volume = {182},
	pages = {223-236},
	year = {2017},
	author = {CHATZIGEORGIOU, George and CHEMISKY, Yves and PRAUD, Francis and MERAGHNI, Fodil},
	abstract = {In this paper, a new modelling approach is presented to describe the damaged mechanical response of unidirectional composites under the small strain assumption. The proposed constitutive equations inherits from the phenomenological theories of Continuum Damage Mechanics (CDM) but brings out a micromechanical description of the damaged Representative Volume Element (RVE) while being formulated in a proper thermodynamical framework. The model is provided with an implicit numerical scheme based on the so-called ”return mapping algorithm” as well as the formulation of the tangent operator. The identification and the prediction capabilities of the model are validated using experimental data including off-axis tensile tests. Finally, to provide a better understanding of the model, a multi-axial non-proportional simulation is performed and analysed.},
	issn = {0263-8223},
	edition = {Post-print},
	title = {Hybrid micromechanical-phenomenological modelling of anisotropic damage and anelasticity induced by micro-cracks in unidirectional composites},
	publisher = {Elsevier},
	url = {10.1016/j.compstruct.2017.09.013}
}

@ARTICLE{10985-17639,
	journal = {Journal of Reinforced Plastics and Composites},
	volume = {36},
	pages = {271-282},
	year = {2017},
	author = {SHIRINBAYAN, Mohammadali and SUROWIEC, Benjamin and LARIBI, M. A. and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {This paper presents the experimental results of tension-tension stress-controlled fatigue tests performed on advanced sheet molding compound (A-SMC). It aims at analyzing the effect of fiber orientation, loading amplitude, and frequency on the fatigue response and the related temperature evolution due to the self-heating phenomenon. Two types of A-SMC have been analyzed: randomly oriented (RO) and highly oriented (HO). The coupled effect of the loading amplitude and the frequency has been studied. It has been shown that the couple frequency-amplitude affects the nature of the fatigue overall response which can be governed by the damage mechanisms accumulation (mechanical fatigue) and/or by the self-heating (induced thermal fatigue). For fatigue loading at 100 Hz, self-heating has been observed and yielded to a temperature rise up to 70 C. The latter causes a decrease of the storage modulus related to the b-transition of the vinylester. It has been demonstrated that the self-heating produced a material softening and decreased the fatigue life. SEM observations revealed that the samples tested at 100 Hz, exhibit smooth debonding surfaces due to the induced thermal softening of the matrix whereas more brittle fracture of the matrix surrounding fibers is observed during the fatigue tests achieved at 10 Hz.},
	issn = {0731-6844},
	edition = {Post-print},
	title = {Coupled effect of loading frequency and amplitude on the fatigue behavior of advanced sheet molding compound (A-SMC)},
	number = {4},
	publisher = {SAGE Publications},
	url = {10.1177/0731684416682853}
}

@CONFERENCE{10985-11998,
	address = {France},
	year = {2017},
	author = {ACHOUR, Nadia and CHATZIGEORGIOU, George and BONNAY, Kevin and MERAGHNI, Fodil},
	abstract = {Un nouveau modèle multi-échelles en régime viscoplastique endommageable est développé pour un composite à matrice polypropylène renforcé par des fibres de verre courtes. Basé sur l’approche en champs moyens de Mori Tanaka, il intègre une matrice viscoplastique modélisée par un modèle phénoménologique nommé par ses auteurs DSGZ et des fibres de verres modélisées par un comportement élastique linéaire. Le modèle multi-échelles permet d’intégrer la microstructure du composite préalablement caractérisée par la microtomographie aux rayons X. L’introduction de la matrice viscoplastique dans le modèle de Mori Tanaka est rendu possible grâce à une implémentation par intégration implicite du modèle qui permet d’obtenir le module tangent nécessaire au mod èle d’homogénéisation. L’endommagement du matériau est intégré à travers du mécanisme de décohésion de l’interface fibre/ matrice. Ce mécanisme d’endommagement est modélisé par une loi cumulative de type Weibull. La dépendance à la vitesse de déformation du composite observée lors des essais dynamiques est intégrée au moyen de la prise en compte de la viscosité de la matrice. Les paramètres du modèle sont identifiés par une méthode inverse sur la base d’essais de traction à différentes vitesses et pour différentes orientations d’éprouvettes. Le modèle développé a été validé par comparaison avec des essais de traction.},
	edition = {Post-print},
	title = {Modélisation multi-échelles en viscoplasticité endommageable de composites thermoplastiques renforcés par des fibres discontinues},
	url = {http://hdl.handle.net/10985/11998}
}

@CONFERENCE{10985-11174,
	address = {Allemagne},
	isbn = {978-3-00-053387-7},
	year = {2016},
	author = {BONNAY, Kevin and DESPRINGRE, Nicolas and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {Due to the compromise between their thermomechanical properties and low density, Short Fiber Reinforced Polyamides (SFRP) present a good alternative to metals for automotive structural components. The microstructure of such materials, combined with the matrix sensitivity to environmental conditions, has a strong impact on their overall behavior and the related damage. A new multi-scale modelling strategy is proposed, based on the experimental observations of interfacial damage evolution for PA66-GF30 composites. Three main key-points have been integrated to this approach: an original damage evolution law at the interface, an appropriate load transfer law at the matrix-fiber interface, and a homogenization strategy founded on the generalized Mori-Tanaka scheme. The damage evolution law is driven by a local probabilistic criterion based on the interfacial stress field estimation. This type of evolution depends on the maximal local damage rate at the fiber/matrix interface, determined from a numerical evaluation at several points of the interface surrounding the inclusion. It is then coupled with a load transfer law formulated according to a modified shear lag model (SLM). The developed model is assessed with a finite element (FE) computation integrating cohesive elements at the matrix-fiber interface. The FE unit cell consists in a periodic media (hexagonal array) with periodic boundary conditions. The fiber-matrix interface integrates cohesive elements, with a cohesive law driven by a Paulino-Park-Roesler (PPR) potential-based formulation. The latter has been proven to be suitable for the 3D modeling of interface in reinforced composites. The proposed approach is able to accurately capture the non-linear behavior of short fiber reinforced polyamide composites accounting for interfacial damage.},
	edition = {Post-print},
	title = {Interfacial damage and load transfermodeling in short fiber reinforced composites},
	url = {http://hdl.handle.net/10985/11174}
}

@CONFERENCE{10985-11179,
	address = {Allemagne},
	isbn = {978-3-00-053387-7},
	year = {2016},
	author = {ECKEL, Sebastian and POMAREDE, Pascal and DECLERCQ, Nico Felicien and MERAGHNI, Fodil},
	abstract = {The presented experimental work describes the nondestructive examination of polymer based composites using an acoustic method under the consideration of nonlinear effects. The technique is based on the fact that material behaves more nonlinearly in the presence of damage than in the undamaged state during dynamic load. Damaged structures show an increased nonlinear transmission behavior. Consequently, the level of nonlinearity is an indication of the damage severity. The aim is to analyze the nonlinear transfer behavior and if a quantification can be used to determine the damage severity. The focus is on the type of nonlinear acoustic spectroscopy methods that analyses the modulation spectrum. When two harmonic waves are applied with different frequencies to a damaged material, the amplitude of the high-frequency wave will be modulated by the low-frequency wave and the created spectrum manifests an intermodulation by showing new frequencies such as sidebands and higher harmonics. Samples made of glass fiber reinforced vinyl ester respectively epoxy, both taffeta woven, and pre-damaged by application of tensile tests using different levels of tension have been considered. A new experimental setup has been developed and a clearly visible increase of the intermodulation with increasing damage has been noticed for both materials. Finally, the method is proven to nondestructively evaluate the damage state of composites.},
	edition = {Post-print},
	title = {Nondestructive testing of composites using a nonlinear acoustic spectroscopy method},
	url = {http://hdl.handle.net/10985/11179}
}

@ARTICLE{10985-10214,
	journal = {International Journal of Mechanical Sciences},
	volume = {in press},
	pages = {29p.},
	year = {2015},
	author = {ACHOUR-RENAULT, Nadia and CHATZIGEORGIOU, George and CHEMISKY, Yves and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {In this work, the phenomenological viscoplastic DSGZ model[Duan, Y., Saigal, A., Greif, R., Zimmerman, M. A., 2001. A Uniform Phenomenological Constitutive Model for Glassy and Semicrystalline Polymers. Polymer Engineering and Science 41 (8), 1322-1328], developed for glassy or semi-crystalline polymers, is numerically implemented in a three dimensional framework, following an implicit formulation. The computational methodology is based on the radial return mapping algorithm. This implicit formulation leads to the definition of the consistent tangent modulus which permits the implementation in incremental micromechanical scale transition analysis. The extended model is validated by simulating the polypropylene thermoplastic behavior at various strain rates (from 0:92s-1 to 258s-1) and temperatures (from 20°C to 60°C). The model parameters for the studied material are identified using a heuristic optimization strategy based on genetic algorithm. The capabilities of the new implementation framework are illustrated by performing finite element simulations for multiaxial loading.},
	issn = {0020-7403},
	edition = {Post-print},
	title = {Implicit implementation and consistent tangent modulus of a viscoplastic model for polymers},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2015.09.010}
}

@CONFERENCE{10985-10012,
	address = {Etats-Unis},
	isbn = {9780819499844},
	year = {2014},
	author = {HARTL, Darren and CHEMISKY, Yves and MERAGHNI, Fodil},
	abstract = {In this work, a constitutive model is developed that describe the behavior of shape memory alloys undergoing a large number of cycles, developing internal damage, and eventually failing. Physical mechanisms associated with martensitic phase transformation occurring during cyclic loadings such as transformation strain generation and recovery, transformation-induced plasticity, and fatigue damage are all taken into account within a thermo-dynamically consistent framework. Fatigue damage is described utilizing a continuum theory of damage. The damage growth rate has been formulated as a function of both the stress state and also the magnitude of the transformation strain, while the complete or partial nature of the transformation cycles is also considered as per experimental observations. Simulation results from the model developed are compared to uniaxial actuation fatigue tests at different stress levels. It is shown that both lifetime and the evolution irrecoverable strain can be accurately simulated.},
	edition = {Post-print},
	title = {Three-Dimensional Constitutive Model Considering Transformation-Induced Damage and Resulting Fatigue Failure in Shape Memory Alloys},
	publisher = {SPIE},
	url = {10.1117/12.2046668}
}

@CONFERENCE{10985-11181,
	address = {Canada},
	year = {2016},
	author = {CHEMISKY, Yves and CHATZIGEORGIOU, George and MERAGHNI, Fodil},
	abstract = {This communication presents a methodology and tools that take advantage of research projects developments in the field of mechanics of materials for education outreach. Such new learning experience should meets the requirements of efficient interactive learning : ease of use, hands-on oriented, interactive exposure to theoretical concepts. It also has to be linked to state-of-the art scientific and industrial design numerical tools. Based on the new generations students audience expectations, an interactive method has been developed to facilitate the exposure of student to theoretical concepts and hands-on experience. Interactive learning notebooks are utilized, combined with high-efficiency scientific libraries wrapped in the widely-utilized Python language. Such methodology thus allows to easily link the theoretical concepts to industrial softwares and numerical tools, through their Python language scripting interfaces.},
	edition = {Post-print},
	title = {Interactive learning experience in mechanics of materials: the ’SIMMIT’ project},
	url = {http://hdl.handle.net/10985/11181}
}

@ARTICLE{10985-11436,
	journal = {Experimental Mechanics},
	pages = {1-11},
	year = {2016},
	author = {ECKEL, Sebastian and POMAREDE, Pascal and DECLERCQ, Nico Felicien and MERAGHNI, Fodil},
	abstract = {The presented experimental work describes the nondestructive damage examination of polymer-matrix composites using acoustic methods under the consideration of nonlinear effects. The aim is to analyze these nonlinear effects in order to provide a quantification of the nonlinear acoustic transmission which is related to the damage state and its severity in the composite material. The first objective was to study the effectiveness of the distortion evaluation method and its related parameter: the BTotal Difference Frequency Distortion^ (TDFD) parameter. The TDFD was utilized as a new damage indicator to quantify the progressive damage state in composite materials. The TDFD method had initially been proposed to characterize the distortion of audio amplifiers. A custom-made setup was developed that imposes acoustic signals to the structure. The samples’ vibrations were afterwards analyzed by a laser vibrometer and further spectrum evaluations. The developed method was applied to two composite materials, both reinforced with taffeta woven glass-fibers, but having different thermoset polymer matrix, i.e. vinylester and epoxy. The damage was introduced in the specimen by tensile tests with a stepwise increase of the tension loading. It was observed that damage influences the intensity of nonlinear intermodulation after having introduced two harmonic and constant signals of different and randomly chosen frequencies in the specimen. The nonlinear intermodulation was then quantified by computing the TDFD parameter. In the specific case of epoxy based composites, high frequency peaks were noted for the high tensile loading levels only. The TDFD parameter was then modified in order to take into account this effect. For both studied composites, the modified TDFD parameter increases with the damage accumulation caused by the applied stepwise tensile loading.},
	issn = {0014-4851},
	edition = {Post-print},
	title = {Investigation of Damage in Composites Using Nondestructive Nonlinear Acoustic Spectroscopy},
	publisher = {Society for Experimental Mechanics},
	url = {10.1007/s11340-016-0222-6}
}

@ARTICLE{10985-9966,
	journal = {European Journal of Mechanics - A/Solids},
	volume = {45},
	pages = {226-237},
	year = {2014},
	author = {CHEMISKY, Yves and PIOTROWSKI, Boris and ECHCHORFI, Rachid and BOURGEOIS, Nadine and PATOOR, Etienne and MERAGHNI, Fodil},
	abstract = {This paper presents an identification procedure for the parameters of a thermodynamically based constitutive model for Shape memory Alloys (SMAs). The proposed approach is a gradient-based method and utilizes an analytical computation of the sensitivity matrix. For several loading cases, including superelasticity, that are commonly utilized for the model parameters identification of such a constitutive model, a closed-form of the total infinitesimal strain is derived. The partial derivatives of this state variable are developed to find the components of the sensitivity matrix. A LevenbergeMarquardt algorithm is utilized to solve the inverse problem and find the best set of model parameters for specific SMA materials. Moreover, a pre-identification method, based on the second derivative of the total strain components is proposed. This provides a suitable initial set of model parameters, which increases the efficiency of the inverse method. The proposed approach is applied for the simultaneous identification of the non-linear constitutive parameters for two superelastic SMAs. The comparison between experimental and numerical curves obtained for different temperatures shows the capabilities of the developed identification approach. The robustness and the efficiency of the developed approach are then experimentally validated},
	issn = {0997-7538},
	edition = {Post-print},
	title = {Parameter identification of a thermodynamic model for superelastic shape memory alloys using analytical calculation of the sensitivity matrix},
	publisher = {Elsevier},
	url = {10.1016/j.euromechsol.2013.12.010}
}

@ARTICLE{10985-11854,
	journal = {Composites Part B: Engineering},
	volume = {115},
	pages = {3-13},
	year = {2017},
	author = {SHIRINBAYAN, Mohammadali and BOCQUET, Michel and SUROWIEC, Benjamin and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {This paper aims to present an experimental multi-scale analysis of quasi-static and high strain rate damage behavior of a new formulation of SMC composite (Advanced SMC). In order to study its capability to absorb energy through damage accumulation, Randomly Oriented (RO) and High oriented (HO) A-SMC composites damage has been investigated at both microscopic and macroscopic scales. A specific device has been developed in order to perform Interrupted Dynamic Tensile Tests (IDTT) which allows analyzing the evolution of the microscopic damage mechanisms occurring during rapid tensile tests. Several damage micro-mechanisms have been pointed out. The relative influences of these micro-damage events and their interactions have been related to the macroscopic damage behavior through the definition of microscopic and macroscopic damage indicators. Damage threshold and kinetic have been quantified at various strain rate for different microstructures and loading cases (RO, HO-0 and HO-90). It has been shown at both scales that increasing strain rate leads to an onset of damage initiation together with a reduction of the damage accumulation kinetic. Moreover, the influence of the fiber orientation has been studied in order to emphasize the anisotropic strain rate effect at the fiber-matrix interface scale. The latter was related to the influence of the microstructure of A-SMC composites. Finally, on the basis of the whole experimental results, the microscopic origin of the viscous nature of the damage behavior of A-SMCs composites have been discussed and related to the influence of the strain rate and microstructure.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Multi-scale experimental investigation of the viscous nature of damage in Advanced Sheet Molding Compound (A-SMC) submitted to high strain rates},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2016.10.061}
}

@CONFERENCE{10985-10149,
	address = {Danemark},
	year = {2015},
	author = {CHATZIGEORGIOU, George and HOSSAIN, Mokarram and STEINMANN, Paul and MERAGHNI, Fodil},
	abstract = {This work proposes a coupled magneto-mechanical multi-scale model for simulating the curing process of magneto-sensitive polymers. In this type of composites, ferromagnetic particles are mixed with a liquid polymeric matrix in the uncured stage. The polymer curing process is a complex mechanism that transforms a fluid to a solid with time. In order to identify the overall response of the magneto-mechanically coupled polymeric composite, an extended Mori-Tanaka semi-analytical homogenization procedure is utilized that tranfers information from the micro to the macroscale. The stiffness gaining phenomenon as in the case of a curing process is realized by time-dependent material parameters appearing within the polymer piezomagnetic material tensors. Moreover, the volume reduction during curing is taken into account through a magnetic induction dependent shrinkage model. Several numerical examples illustrate the model capability to capture major observable phenomena in the curing process of polymeric composites under infinitesimal deformations and magnetic field.},
	edition = {Post-print},
	title = {Micromechanics modeling of magneto-sensitive polymeric materials during curing},
	url = {http://hdl.handle.net/10985/10149}
}

@ARTICLE{10985-11897,
	journal = {Journal of the Mechanics and Physics of Solids},
	volume = {106},
	pages = {257-282},
	year = {2017},
	author = {CHATZIGEORGIOU, George and JAVILI, Ali and MERAGHNI, Fodil},
	abstract = {The objective of this contribution is to explain the size effect in composites due to the interfacial energy between the constituents of the underlying microstructure. The generalized interface energy accounts for both jumps of the deformation as well as the stress across the interface. The cohesive zone and elastic interface are only two limit cases of the general interface model. A closed form analytical solution is derived to compute the effective interface-enhanced material response. Our novel analytical solution is in excellent agreement with the numerical results obtained from the finite element method for a broad variety of parameters and dimensions. A remarkable observation is that the notion of size effect is theoretically bounded verified by numerical examples. Thus, the gain or loss via reducing the dimensions of the microstructure is limited to certain ultimate values, immediately relevant for designing nano-composites.},
	issn = {0022-5096},
	edition = {Post-print},
	title = {Generalized interfacial energy and size effects in composites},
	publisher = {Elsevier},
	url = {10.1016/j.jmps.2017.06.002}
}

@ARTICLE{10985-9971,
	journal = {Composites Part B: Engineering},
	volume = {82},
	pages = {30-41},
	year = {2015},
	author = {SHIRINBAYAN, Mohammadali and SUROWIEC, Benjamin and BOCQUET, Michel and TCHARKHTCHI, Abbas and FITOUSSI, Joseph and MERAGHNI, Fodil},
	abstract = {Advanced Sheet Molding Compound (A-SMC) is a serious composite material candidate for structural automotive parts. It has a thermoset matrix and consists of high weight content of glass fibers (50% in mass) compared to standard SMC with less than 30% weight fiber content. During crash events, structural parts are heavily exposed to high rates of loading and straining. This work is concerned with the development of an advanced experimental approach devoted to the micro and macroscopic characterization of A-SMC mechanical behavior under high-speed tension. High speed tensile tests are achieved using servo-hydraulic test equipment in order to get required high strain rates up to 100 s 1. Local deformation is measured through a contactless technique using a high speed camera. Numerical computations have led to an optimal design of the specimen geometry and the experimental damping systems have been optimized in terms of thickness and material properties. These simulations were achieved using ABAQUS explicit finite element code. The developed experimental methodology is applied for two types of A-SMC: Randomly Oriented (RO) and Highly Oriented (HO) plates. In the case of HO samples, two tensile directions were chosen: HO-0 (parallel to the Mold Flow Direction (MFD)) and HO-90 (perpendicular to the MFD). High speed tensile tests results show that A-SMC behavior is strongly strain-rate dependent although the Young's modulus remains constant with increasing strain rate. In the case of HO-0 , the stress damage threshold is shown an increase of 63%, when the strain rate varies from quasi-static (0.001 s 1) to 100 s 1. The experimental methodology was coupled to microscopic observations using SEM. Damage mechanisms investigation of HO and RO specimens showed a competition between two mechanisms: fiber-matrix interface debonding and pseudo-delamination between neighboring bundles of fibers. It is shown that pseudo-delamination cannot be neglected. In fact, this mechanism can greatly participate to energy absorption during crash. Moreover, the influence of fiber orientation and imposed velocity is studied. It is shown that high strain rate and oriented fiber in the tensile direction favor the pseudo-delamination.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {High strain rate visco-damageable behavior of Advanced Sheet Molding Compound (A-SMC) under tension},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2015.07.010}
}

@CONFERENCE{10985-13334,
	address = {Belgique},
	year = {2015},
	author = {EL HACHI, Younes and MALARD, Benoît and WRIGHT, Jonathan and BERVEILLER, Sophie},
	abstract = {To better understand the properties of polycrystals at a microscopic scale during cyclic mechanical loading we have measured the relationship between grain orientations, their positions inside the sample and their internal stresses. In this work, in-situ 3DXRD technique was performed on over hundred grains during the stress-induced martensitic transformation in a Cu-Al-Be shape memory alloy. Information about the position, orientation, and stress field was obtained for each austenitic grain. These results have been used to develop a procedure that allows automatic processing for a large number of grains, matching them during loading and leads to a quantitative stress field. A strong heterogeneity of stress state between the grains at the surface and in the volume is evident.},
	edition = {Post-print},
	title = {Measurement of lattice rotations and internal stresses in over one hundred individual grains during a stress-induced martensitic transformation},
	publisher = {EDP Sciences},
	url = {10.1051/matecconf/20153302003}
}

@ARTICLE{10985-13316,
	journal = {Journal of Materials Processing Technology},
	pages = {339 - 349},
	year = {2017},
	author = {GUIHEUX, Romain and KUBLER, Régis and BOUSCAUD, Denis and PATOOR, Etienne and PUYDT, Quentin and BERVEILLER, Sophie},
	abstract = {During conventional shot peening on metastable austenitic steels, martensitic transformation occurs in addition to plastic straining. In this work, the impact of a single spherical steel shot on a AISI 301LN steel was studied. The volume fraction of martensite, residual stresses in both phases were determined in the vicinity of the dent as a function of the shot velocity and diameter. An elasto-plastic two phase model that includes martensitic phase transformation was adapted to model mechanical and microstructural fields and implemented in Abaqus Explicit for the 2D simulation of a single shot impact. It was found, for instance, that the martensitic transformation takes place only under the dent and that martensite is in tension at the surface while austenite is in compression. Simulation results of stress levels showed a good agreement with experimental stresses determined by X-ray Diffraction.},
	issn = {0924-0136},
	edition = {Post-print},
	title = {Martensitic transformation induced by single shot peening in a metastable austenitic stainless steel 301LN: Experiments and numerical simulation},
	number = {249},
	publisher = {Elsevier},
	url = {10.1016/j.jmatprotec.2017.06.015}
}

@ARTICLE{10985-13314,
	journal = {Materials Science and Engineering: A},
	pages = {504 - 510},
	year = {2017},
	author = {ELMAY, Wafa and PATOOR, Etienne and GLORIANT, Thierry and PRIMA, Frederic and LAHEURTE, Pascal and BERVEILLER, Sophie},
	abstract = {The present paper deals with an in-situ X-ray diffraction analysis during cyclic tensile tests of a fully martensitic Ti-24Nb alloy. Texture evolution of martensite α″ phase was followed during loading-unloading cycles. Preferential formation and reverse transformation of particular martensite variants have been observed based on pole figure analysis. The occurrence of the deformation mechanisms for the martensitic Ti-24Nb alloy was also commented by coupling microstructural observations during in-situ experiments and additional cyclic tests followed by heating after each unloading. Through the study of the evolution of the lattice strain, it was found that under loading conditions, the {020} planes exhibit a large tension lattice strain while the {200} planes are subjected to a compression solicitation, which causes the lattice parameters a and c to be shrunk, and b to be elongated.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Texture evolution of orthorhombic α″ titanium alloy investigated by situ X-ray diffraction},
	number = {679},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2016.10.072}
}

@ARTICLE{10985-9943,
	journal = {Acta Materialia},
	volume = {59},
	pages = {3636-3645},
	year = {2011},
	author = {MALARD, Benoît and WRIGHT, Jonathan and PATOOR, Etienne and GEANDIER, Guillaume and BERVEILLER, Sophie},
	abstract = {Two synchrotron diffraction techniques, three-dimensional X-ray diffraction and Laue microdiffraction, are applied to studying the deformation behaviour of individual grains embedded in a Cu74Al23Be3 superelastic shape memory alloy. The average lattice rotation and the intragranular heterogeneity of orientations are measured during in situ tensile tests at room temperature for four grains of mean size 1 mm. During mechanical loading, all four grains rotate and the mean rotation angle increases with austenite deformation. As the martensitic transformation occurs, the rotation becomes more pronounced, and the grain orientation splits into several sub-domains: the austenite orientation varies on both sides of the martensite variant. The mean disorientation is 1 . Upon unloading, the sub-domains collapse and reverse rotation is observed.},
	issn = {1359-6454},
	edition = {Post-print},
	title = {In situ synchrotron analysis of lattice rotations in individual grains during stress-induced martensitic transformations in a polycrystalline CuAlBe shape memory alloy},
	number = {9},
	publisher = {Elsevier},
	url = {10.1016/j.actamat.2011.02.037}
}

@ARTICLE{10985-9866,
	journal = {Materials Science and Engineering: A},
	volume = {560},
	pages = {433-438},
	year = {2013},
	author = {MENDIGUREN, Joseba and CORTES, Fernando and GALDOS, Lander and BERVEILLER, Sophie},
	abstract = {This paper deals with the analysis of thestrain path's influence on the elastic behaviour of TRIP700 steel; it aims to validate the cyclic testing method to characterise inelastic behaviour of advanced high strength steels (AHSS). Different cyclic tests are done, where the strain path is changed from test to test. Large deformation strain gages are used to determine the inelastic behaviour of the specimens at macro-level. At a lower scale, stress measurements are carried out using the XRD technique during an in-situ tensile test: ferrite and austenite phases’stresses are measured before unloading and after loading again to study the strain path's influence. By means of this work it is confirmed that the elastic strain path has no influence on the unloading–loading of this TRIP steel. These results prove that conventional loading–unloading cyclic testing is a valid methodology for a detailed characterisation of the elastic modulus and reliable numerical modelling of springback.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Strain path's influence on the elastic behaviour of theTRIP 700 steel},
	number = {10},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2012.09.087}
}

@ARTICLE{10985-10046,
	journal = {Journal of Materials Engineering and Performance},
	volume = {24},
	pages = {1262-1278},
	year = {2015},
	author = {BEN BETTAIEB, Mohamed and VAN HOOF, Thibaut and MINNEBO, Hans and PARDOEN, Thomas and DUFOUR, Philippe and JACQUES, Pascal J. and HABRAKEN, Anne-Marie},
	abstract = {A physics-based, uncoupled damage model is calibrated using cylindrical notched round tensile specimens made of Ti5553 and Ti-6Al-4V alloys. The fracture strain of Ti5553 is lower than for Ti-6Al-4V in the full range of stress triaxiality. This lower ductility originates from a higher volume fraction of damage sites. By proper heat treatment, the fracture strain of Ti5553 increases by almost a factor of two, as a result of a larger damage nucleation stress. This result proves the potential for further optimization of the damage resistance of the Ti5553 alloy. The damage model is combined with an elastoviscoplastic law in order to predict failure in a wide range of loading conditions. In particular, a specific application involving bolted sectors is addressed in order to determine the potential of replacing the Ti-6Al-4V by the Ti5553 alloy.},
	issn = {1059-9495},
	edition = {Post-print},
	title = {Micromechanics-Based Damage Analysis of Fracture in Ti5553 Alloy with Application to Bolted Sectors},
	number = {3},
	publisher = {Springer Verlag/ASM International},
	url = {10.1007/s11665-015-1383-7}
}

@ARTICLE{10985-7934,
	journal = {Composites Part B: Engineering},
	volume = {61},
	pages = {55-65},
	year = {2014},
	author = {ARIF, Muhamad Fatikul and CHEMISKY, Yves and ROBERT, Gilles and FITOUSSI, Joseph and MERAGHNI, Fodil and SAINTIER, Nicolas},
	abstract = {This paper aims at studying fatigue damage behavior of injection molded 30 wt% short glass fiber reinforced polyamide-66 composite (PA66/GF30). The evolution of dynamic modulus, hysteresis area, cyclic creep and temperature during fatigue tests were analyzed and discussed. Damage analyses by X-ray micro-computed tomography (lCT) technique on interrupted fatigue tests at several percentages of total fatigue life were performed to further understand the damage mechanisms and evolution during fatigue loading. It can be observed that experimental results related to the evolution of dynamic modulus, strain, temperature and energy dissipation are important and consistently complement each other for damage evaluation of PA66/GF30. During fatigue loading, diffuse damage occurs over the entire specimen though the damage does not necessarily exhibit the same level between different locations inside the specimen. The lCT analysis of voids characteristics demonstrates that the damage continuously increases during fatigue loading. The damage is developed notably along fiber interface in the form of fiber/matrix interfacial debonding.},
	issn = {1359-8368},
	edition = {Post-print},
	title = {Multiscale fatigue damage characterization in short glass fiber reinforced polyamide-66},
	publisher = {Elsevier},
	url = {10.1016/j.compositesb.2014.01.019}
}

@CONFERENCE{10985-10361,
	address = {Espagne},
	year = {2014},
	author = {ARIF, Muhamad Fatikul and CHEMISKY, Yves and ROBERT, Gilles and FITOUSSI, Joseph and MERAGHNI, Fodil and SAINTIER, Nicolas},
	abstract = {Damage behavior of dry as molded, 30 wt% short glass fiber reinforced polyamide-66 (PA66/GF30) under fatigue loading has been investigated by X-ray micro-computed tomography (μCT). Based on visual observation on μCT images, fiber/matrix interfacial debonding is considered as the main fatigue damage mechanism. Void features in the shell and core layer of the μCT 3D images have been identified. The trend of void volume and void aspect ratio shows marked difference on the damage kinetic between the shell and core layer. Though the damage is mainly developed along fiber interface in both shell and core layer, the interfacial debonding in the shell layer appears earlier than the one in the core layer. While the damage at fiber interface in the shell layer develops in all fatigue loaded specimens, the interfacial debonding in the core layer appears only at the very last stage of the fatigue life.},
	edition = {Post-print},
	title = {Fatigue damage investigation of PA66/GF30 by X-Ray microtomography},
	url = {http://hdl.handle.net/10985/10361}
}

@ARTICLE{10985-8763,
	journal = {Materials Science and Engineering: A},
	volume = {540},
	pages = {212–225},
	year = {2012},
	author = {BARBIER, D and BOLLE, B and FAVIER, Véronique},
	abstract = {The high manganese austenitic steels with low stacking fault energy (SFE) present outstanding mechanical properties due to the occurrence of two strain mechanisms: dislocation glide and twinning. Both mechanisms are anisotropic. In this paper, we analyzed the effect of monotonous loading path on the texture, the deformation twinning and the stress–strain response of polycrystalline high Mn TWIP steel. Experimental data were compared to predicted results obtained by two polycrystalline models. These two models are based on the same single crystal constitutive equations but differ from the homogenization scheme. The good agreement between experiments and calculations suggest that the texture plays a key role in twinning activity and kinetics with regard to the intergranular stress heterogeneities. Rolling direction simple shear induces single twinning while rolling and transverse direction uniaxial tensions induce multi-twinning leading to lower twin volume fractions due to twin–twin interactions.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Modeling the deformation textures and microstructural evolutions of a Fe–Mn–C TWIP steel during tensile and shear testing},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2012.01.128}
}

@ARTICLE{10985-11196,
	journal = {Materials Science and Engineering: A},
	volume = {617},
	pages = {97-109},
	year = {2014},
	author = {BEN BETTAIEB, Mohamed and VAN HOOF, Thibaut and PARDOEN, Thomas and DUFOUR, Philippe and LENAIN, Astrid and JACQUES, Pascal J. and HABRAKEN, Anne-Marie},
	abstract = {The elastoviscoplastic behavior of the Ti5553 alloy is characterized and compared to the classical Ti–6Al–4V alloy. The true stress–strain curves are determined based on tensile tests performed under different strain rates at room temperature and at 1501C, from which the elastic constants and the parameters of a Norton–Hoff viscoplastic model are identified. The strength of the Ti5553 alloy is 20–40% higher than the strength of the Ti–6Al–4V alloy. The Ti5553 alloy constitutes thus a promising candidate for advanced structural applications. In view of modeling structural applications of forming operations, the elastic and plastic initial anisotropy of the two alloys is investigated by combining compression on cylinders with elliptical sections, uniaxial tensile tests in different material directions, plane strain and shear tests. The initial anisotropy of the different alloys is very weak which justifies the modeling of the mechanical behavior with an isotropic yield surface. The identified elastoviscoplastic model is validated by comparing experimental results with FE predictions both on cylindrical notched specimens subjected to tensile tests and onflat specimens subjected to plane strain conditions.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {On the elasto-viscoplastic behavior of the Ti5553 alloy},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2014.08.055}
}

@ARTICLE{10985-10414,
	journal = {Philosophical Magazine},
	volume = {95},
	pages = {3402-3412},
	year = {2015},
	author = {CHATZIGEORGIOU, George and JAVILI, Ali and STEINMANN, Paul},
	abstract = {In this work we propose a micromechanics model, based on the composite spheres assemblage method, for studying the electrostatic behaviour of particle and porous composites when the interface between the particle (or the pore) and the matrix has its own independent behaviour. Examples from experimental results in porous media and particle composites are utilized to demonstrate the model’s capabilities. The current model shows a better agreement with experiments compared with other available studies. Furthermore, it is shown that the interface dielectric constant is independent of the experiments which prove its nature as a material parameter.},
	issn = {1478-6435},
	edition = {Post-print},
	title = {Interface properties influence the effective dielectric constant of composites},
	number = {28-30},
	publisher = {Taylor \& Francis},
	url = {10.1080/14786435.2015.1051155}
}

@CONFERENCE{10985-9897,
	address = {Allemagne},
	isbn = {978-3-514-00813-7},
	pages = {458-465},
	booktitle = {Future trends in steel development, processing technology and applications bringing the automotive, supplier and steel industries together},
	year = {2014},
	author = {BOMONT-ARZUR, Anne and BUESSLER, Pascal and BOMONT, Olivier and LESCALIER, Christophe},
	abstract = {ArcelorMittal focuses on both mechanical performances and machinability while designing new steel grades. ArcelorMittal has developed specific programs for machinability testing in turning, low and high speed drilling and gear machining. Machinability is evaluated through cutting forces, chip shape, surface quality and tool life. Gear machining is one of the main machining operations involved in powertrain manufacturing operations. The literature proposes many papers dealing with this process however there are too few studies interested in steel machinability evaluation while gear machining. This paper focuses on a particular gear manufacturing process, i.e. gear hobbing, and more precisely on steel machinability for gear hobbing applications. Tools as well as kinematics of gear hobbing are quite complex. This paper proposes a comprehensive experimental protocol for machinability testing. This protocol is based on a European standard. Tests are performed on a machine tool using a commercially available cutting tool. Tests provide the range of cutting conditions for five different steel grades. Both steels have a ferrite-pearlite structure with yield stress from 530 to 800 MPa and ultimate tensile stress from 680 to 900 MPa. Four grades are devoted to bar machining. The last one is devoted to forming and then machining operations. Many metallurgical solutions are investigated to enhance machinability such as lead addition or increase in sulfur content or calcium treatment. This paper analyses the influence of steel composition and structure on machinability. It shows the relevance of metallurgical solutions for machinability enhancement even for powertrain applications. Cutting conditions clearly depend on the metallurgical solution even if specific cutting force is finally close. The main difference is found on tool wear with tool life ratio from 1 to 1.5.},
	edition = {Post-print},
	title = {High Strength Steel solutions for powertrain applications},
	publisher = {H.J. Wieland},
	url = {http://hdl.handle.net/10985/9897}
}

@ARTICLE{10985-9973,
	journal = {Mechanics of Materials},
	volume = {76},
	pages = {64-92},
	year = {2014},
	author = {MANSOURI, Lotfi and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {Because the localization of deformation into narrow planar bands is often precursor to material failure, several approaches have been proposed to predict this phenomenon. In this paper, the Gurson–Tvergaard– Needleman (GTN) elastic–plastic–damage model for ductile materials is considered. A large-strain version of this constitutive model is coupled with the Rice localization criterion, which is based on bifurcation theory, to investigate strain localization. The resulting loss of ellipticity condition is then used to determine ellipticiy loss diagrams (ELDs) associated with strain paths that are those typically applied to metals under biaxial stretching. A sensitivity analysis is conducted with respect to the model parameters on a representative selection of ductile materials. The analysis shows that the damage parameters have a significant impact on the predicted ELDs, which confirms the predominant role of damage-induced softening in triggering plastic flow localization with the adopted constitutive description combined with the bifurcation approach. As a consequence of this high sensitivity, it appears that the proper identification of damage parameters is a key issue for accurate plastic flow localization predictions using the GTN model coupled with bifurcation theory. The effect of the dense matrix hardening parameters on the strain localization predictions of the voided aggregate, although found much smaller in the whole, is more noticeable for the plane strain tension loading path or, more generally, when the critical hardening modulus required for localization is not strongly negative.},
	issn = {0167-6636},
	edition = {Post-print},
	title = {Ductility limit prediction using a GTN damage model coupled with localization bifurcation analysis},
	publisher = {Elsevier},
	url = {10.1016/j.mechmat.2014.06.005}
}

@CONFERENCE{10985-10271,
	address = {Espagne},
	year = {2015},
	author = {PEERLINGS, Ron and GEERS, Marc and ABED-MERAIM, Farid },
	abstract = {In the present work, diffuse necking is investigated for stretched metal sheets using two different approaches, namely bifurcation theory and maximum force principle. The contribution includes a critical analysis and a systematic comparison of their respective ability to predict necking. In particular it is shown that, in contrast to bifurcation theory, which is of quite general applicability, some restrictions are associated with the application of maximum force conditions. It is noteworthy that the well-known Swift diffuse necking criterion is recovered through bifurcation analysis. Recall that Swift’s criterion has long been attributed in the literature to the maximum force principle, while it is shown here to rather originate from the bifurcation analysis, which provides it with a sound theoretical justification.},
	edition = {Post-print},
	title = {Comparison of bifurcation analysis and maximum force criteria in the prediction of necking in stretched metal sheets},
	publisher = {E. Oñate, D.R.J. Owen, D. Peric and M. Chiumenti},
	url = {http://hdl.handle.net/10985/10271}
}

@CONFERENCE{10985-10458,
	address = {République tchèque},
	year = {2012},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {In recent years, considerable effort has been devoted to the development of 3D finite elements able to model thin structures (Cho et al., 1998; Sze and Yao, 2000; Abed-Meraim and Combescure, 2002; Vu-Quoc and Tan, 2003; Chen and Wu, 2004). To this end, coupling solid and shell formulations proved to be an interesting strategy, providing continuum finite element models that can be efficiently used for structural applications. In the present work, two solid-shell elements are formulated (a 20-node and a 15-node element) based on a purely three-dimensional approach. The advantages of these elements are shown through the analysis of various structural problems. Note that their main advantage is to allow complex structural shapes to be simulated without classical problems of connecting zones meshed with different element types. These solid-shell elements have a special direction called the “thickness”, along which a set of integration points are located. Reduced integration is also used to prevent some locking phenomena and to increase computational efficiency. Focus will be placed here on linear benchmark problems, where it is shown that these solid-shell elements perform much better than their counterparts, conventional solid elements.},
	edition = {Post-print},
	title = {New quadratic solid-shell elements and their evaluation on popular benchmark problems},
	publisher = {Pavel Solin, Pavel Karban, Jaroslav Kruis},
	url = {http://hdl.handle.net/10985/10458}
}

@ARTICLE{10985-10266,
	journal = {Composite Structures},
	volume = {133},
	pages = {105-116},
	year = {2015},
	author = {KPEKY, Fessal and BOUDAOUD, Hakim and DAYA, El Mostafa and ABED-MERAIM, Farid },
	abstract = {The aim of this work is to propose vibration modeling of sandwich structures with soft core using solid-shell finite elements. Several approaches have been adopted in the literature to accurately model this type of structures; however, they show some limitations in certain configurations of high contrast of material properties or geometric aspect ratios between the different layers. In such situations, it is generally well-known that the use of higher-order or three-dimensional finite elements is more appropriate, but will generate a large number of degrees of freedom and, thereby, large CPU times. In this work, an alternative method is proposed by considering a recently developed linear hexahedral solid-shell element. This solid-shell element is implemented into Matlab in order to use the so-called solver Diamant, which couples Asymptotic Numerical Method (ANM) and Automatic Differentiation (AD). Numerical tests, including various cantilever sandwich beams as well as a simplified pattern of rail on sleepers, are performed to show the efficiency of the proposed approach.},
	issn = {0263-8223},
	edition = {Post-print},
	title = {Modeling of viscoelastic sandwich beams using solid-shell finite elements},
	publisher = {Elsevier},
	url = {10.1016/j.compstruct.2015.07.055}
}

@ARTICLE{10985-10192,
	journal = {Revue Européenne de Mécanique Numérique/European Journal of Computational Mechanics},
	volume = {21},
	pages = {52-71},
	year = {2012},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {The current contribution proposes a six-node prismatic solid-shell denoted as (SHB6). The formulation is extended to geometric and material non-linearities, and focus will be placed on its validation on non-linear benchmark problems. The resulting derivation only involves displacement DOF, as it is based on a fully 3D approach. The motivation behind this is to allow a natural mesh connexion in problems where both structural and continuum elements need to be used. Another major interest is to complement meshes that use hexahedral finite element, especially when free mesh generation tools are employed. The assumed-strain method is combined with an in-plane one-point quadrature scheme in order to reduce both locking phenomena and computational cost. A careful analysis of possible stiffness matrix rank deficiencies shows that this reduced integration does not induce hourglass modes.},
	issn = {1779-7179},
	edition = {Post-print},
	title = {Assumed-strain solid-shell formulation for the six-node finite element SHB6: Evaluation on non-linear benchmark problems},
	number = {1-2},
	publisher = {Hermès / Paris : Lavoisier},
	url = {10.1080/17797179.2012.702430}
}

@CONFERENCE{10985-10357,
	address = {Maroc},
	volume = {1 - Mécanique des solides},
	pages = {104-107},
	booktitle = {Actes du 11ème Congrès de Mécanique},
	year = {2013},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {Ce travail concerne le développement d’une nouvelle famille d’éléments finis (EF) de type coques volumiques quadratiques. Deux éléments seront présentés, un hexaèdre à vingt nœuds et un prisme à quinze nœuds, qui sont formulés à partir d’une approche purement tridimensionnelle. La performance de ces éléments sera montrée à travers l’analyse de problèmes structuraux variés.},
	edition = {Post-print},
	title = {Éléments finis de type coques volumiques pour la simulation des structures minces},
	number = {0210},
	url = {http://hdl.handle.net/10985/10357}
}

@ARTICLE{10985-10006,
	journal = {Key Engineering Materials},
	volume = {651-653},
	pages = {344-349},
	year = {2015},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {Thin structures are commonly designed and employedin engineering industries to save material, reduce weight and improve the overall performance of products. The finite element (FE) simulation of such thin structural components has become a powerful and useful tool in this field. For the last few decades, much attention and effort have been paid to establish accurate and efficient FE. In this regard, the solid–shell concept proved to be very attractive due to its multiple advantages. Several treatments are additionally applied to the formulation of solid–shell elements to avoid all locking phenomena and to guarantee the accuracy and efficiency during the simulation of thin structures. The current contribution presents a family of prismatic and hexahedral assumed-strain based solid–shell elements, in which an arbitrary number of integration points are distributed along the thickness direction. Both linear and quadratic formulations of the solid–shell family elements are implemented into ABAQUS static/implicit and dynamic/explicit software to model thin 3D problems with only a single layer through the thickness. Twopopular benchmark tests are first conducted, in both static and dynamic analyses, for validation purposes. Then, attention is focused on a complex sheet metal forming process involving large strain,plasticity and contact.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Efficient solid–shell finite elements for quasi-static and dynamic analyses and their application to sheet metal forming simulation},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.651-653.344}
}

@ARTICLE{10985-10047,
	journal = {International Journal of Plasticity},
	volume = {65},
	pages = {168-190},
	year = {2015},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {Localized necking is often considered as precursor to failure in metal components. In modern technologies, functional components (e.g., in flexible electronic devices) may be affected by this necking phenomenon, and to avoid the occurrence of strain localization, elastomer substrates are bonded to the metal layers. This paper proposes an investigation of the development of localized necking in both freestanding metal layers and elastomer/metal bilayers. Finite strain versions of both rigid–plastic flow theory and deformation theory of plasticity are employed to model the mechanical response of the metal layer. For the elastomer, a neo-Hookean constitutive law is considered. Localized necking is predicted using both bifurcation (whenever possible) and Marciniak–Kuczynski analyses. A variety of numerical results are presented, which pertain to the prediction of localized necking in freestanding metal layers and metal/substrate bilayers. The effects of the constitutive framework and the presence of an elastomer substrate on strain localization predictions have been specifically highlighted. It is demonstrated that the addition of an elastomer layer can retard significantly the occurrence of localized necking. It is also demonstrated that the results of the Marciniak–Kuczynski analysis tend towards the bifurcation predictions in the limit of a vanishing size for the geometric imperfection.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Investigation of localized necking in substrate-supported metal layers: comparison of bifurcation and imperfection analyses},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2014.09.003}
}

@ARTICLE{10985-17482,
	journal = {Metals},
	volume = {7},
	pages = {455},
	year = {2017},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this work, three numerical necking criteria based on finite element (FE) simulations are proposed for the prediction of forming limit diagrams (FLDs) for sheet metals. An elastic–plastic constitutive model coupled with the Lemaitre continuum damage theory has been implemented into the ABAQUS/Explicit software to simulate simple sheet stretching tests as well as Erichsen deep drawing tests with various sheet specimen geometries. Three numerical criteria have been investigated in order to establish an appropriate necking criterion for the prediction of formability limits. The first numerical criterion is based on the analysis of the thickness strain evolution in the central part of the specimens. The second numerical criterion is based on the analysis of the second time derivative of the thickness strain. As to the third numerical criterion, it relies on a damage threshold associated with the occurrence of necking. The FLDs thus predicted by numerical simulation of simple sheet stretching with various specimen geometries and Erichsen deep drawing tests are compared with the experimental results.},
	issn = {2075-4701},
	edition = {Pre-print},
	title = {Numerical Predictions of the Occurrence of Necking in Deep Drawing Processes},
	number = {11},
	publisher = {MDPI},
	url = {10.3390/met7110455}
}

@ARTICLE{10985-13556,
	journal = {Journal of Manufacturing Science and Engineering},
	volume = {139},
	pages = {3461-3480},
	year = {2017},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The present paper deals with localized necking in stretched metal sheets using the initial imperfection approach. The first objective is to study the effect of kinematic hardening on the formability of a freestanding metal layer. To this end, the behavior of the metal layer is assumed to follow the rigid-plastic rate-independent flow theory. The isotropic (resp. kinematic) hardening of this metal is modeled by the Hollomon (resp. Prager) law. A parametric study is carried out in order to investigate the effect of kinematic hardening on the formability limits. It is shown that the effect of kinematic hardening on the ductility limit is noticeably different depending on the strain path considered. The second aim of the paper is to analyze the effect of an elastomer substrate, perfectly bonded to the metal layer, on the formability of the whole bilayer. It is found that the addition of an elastomer layer substantially enhances the formability of the bilayer, in agreement with earlier studies.},
	issn = {1087-1357},
	edition = {Post-print},
	title = {Localized necking in elastomer-supported metal layers: impact of kinematic hardening},
	number = {6},
	publisher = {American Society of Mechanical Engineers},
	url = {10.1115/1.4035183}
}

@CONFERENCE{10985-20264,
	address = {Italie},
	volume = {2},
	pages = {3577-3584},
	booktitle = {ECF21},
	year = {2016},
	author = {MSOLLI, Sabeur and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {It is well known that both damage and plastic anisotropy strongly affect the ductility limit of thin metal sheets. Due to the manufacturing processes, initial defects, such as inclusions and voids, are commonly present in the produced sheet metals. Plastic anisotropy is a direct outcome of the rolling process, where the resulting metal sheets exhibit preferred crystallographic orientations or strong texture. In the present study, the combined effect of plastic anisotropy and damage on localized necking is numerically investigated and analyzed. To this aim, an improved version of the Gurson—Tvergaard—Needleman (GTN) constitutive framework is used to model the mechanical behavior of the studied sheet. This version, which is an extension of the original GTN model, incorporates Hill’s anisotropic yield function to take into account the plastic anisotropy of the matrix material. Particular attention is devoted to the derivation of the analytical tangent modulus associated with this constitutive model. This extended GTN model is successfully coupled with bifurcation theory to predict sheet metal ductility limits, which are represented in terms of forming limit diagrams (FLDs). The effect of some material parameters (e.g., anisotropy parameters of the metallic matrix) on the shape and the location of the predicted FLDs is then investigated and discussed through numerical simulations.},
	edition = {Post-print},
	title = {Combined effect of damage and plastic anisotropy on the ductility limit of thin metal sheets},
	publisher = {Elsevier},
	url = {10.1016/j.prostr.2016.06.446}
}

@CONFERENCE{10985-10109,
	address = {Espagne},
	isbn = {978-849428447-2},
	pages = {3650-3657},
	booktitle = {World Congress on Computational Mechanics; 5th European Conference},
	year = {2014},
	author = {KPEKY, Fessal and BOUDAOUD, Hakim and DAYA, El Mostafa and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {The aim of this work is to propose a new finite element modeling for vibration of sandwich structures with soft core. Indeed, several approaches have been adopted in the literature to accurately model these types of structures, but show some limitations in certain configurations of high contrast of material properties or geometric aspect ratios between the different layers. In these situations, it is generally well-known that the use of higher-order or three-dimensional finite elements is more appropriate, but will generate a large number of degrees of freedom, and thereby, large CPU times. In this work, an alternative method is followed by considering the linear hexahedral solid-shell element previously developed by Abed-Meraim and Combescure [1]. This element is implemented into the commercial software ABAQUS Via a User Element (UEL) subroutine. Numerical tests on various cantilever sandwich beams are performed to show the efficiency of this approach.},
	edition = {Post-print},
	title = {Vibration modeling of sandwich structures using solid-shell finite elements},
	url = {http://hdl.handle.net/10985/10109}
}

@CONFERENCE{10985-10474,
	address = {France},
	pages = {2 p.},
	booktitle = {Actes du 22ème Congrès Français de Mécanique},
	year = {2015},
	author = {KPEKY, Fessal and BOUDAOUD, Hakim and DAYA, El Mostafa and ABED-MERAIM, Farid },
	abstract = {Dans les dernières décennies, les structures à parois minces intégrant des couches ou patchs de matériaux piézoélectriques ont eu un essor. Ils sont utilisés pour le contrôle des vibrations et de forme, le contrôle acoustique, l’auscultation d'ouvrage de génie civil et aussi dans le domaine de la santé, entre autres. La prédiction du comportement de tels matériaux devient donc indispensable pour leur bonne mise en œuvre. L’un des moyens les moins onéreux pour ce faire est la modélisation numérique, dont le plus répandu demeure la méthode des éléments finis. Depuis les premiers travaux, plusieurs outils ont été proposés dans la littérature pour modéliser le mieux possible les structures piézoélectriques. Beaucoup d’éléments finis tant 2D que 3D ont été développés. Malgré tous ces modèles présents dans la littérature, force est de constater une pénurie d’éléments capables de modéliser à moindre coût des structures combinant couches fines et couches épaisses. La seule alternative demeure un maillage fin avec des éléments volumiques. Ce travail propose l’extension des éléments finis SHB8PS et SHB20, respectivement présentés dans, pour la modélisation des structures contenant des matériaux piézoélectriques. Pour ce faire, des degrés de libertés électriques ont été greffés aux éléments ci-haut en vue de prendre en compte le couplage mécanique-électrique. La loi de contrôle de type PD (Proportional Derivative) a été implémentée pour le contrôle des vibrations. Pour résoudre ce dernier, le solveur « diamant » (DIfférentiation Automatique de la Méthode Asymptotique Numérique Typée) a également été étendu. Ceci a permis de résoudre le problème en prenant en compte la dépendance en fréquence résultant de la partie en vitesse de la loi de contrôle. Pour valider cette nouvelle approche, des tests en statique et vibrations ont été effectués sur des poutres, plaques et coques dans diverses configurations. Les résultats sont confrontés à ceux donnés par les éléments de référence C3D20E (3D quadratique avec ddls piézoélectriques) d’Abaqus et les éléments HEX20E (éléments hexaédriques basiques à interpolation quadratique et avec ddls piézoélectriques). Ce dernier choix (HEX20E codé dans Matlab) est motivé par le fait que certains calculs, tels que la prise en compte du contrôle, ne pouvaient pas se faire avec Abaqus. Il ressort de tous ces cas tests que les éléments SHB8PSE et SHB20E nécessitent moins de degrés de liberté que le C3D20E pour converger. Quelques résultats phares de la modélisation proposée sont présentés ci-dessous.},
	edition = {Post-print},
	title = {Modélisation par éléments finis de type solide-coque de structures piézoélectriques},
	publisher = {Association Française de Mécanique},
	url = {http://hdl.handle.net/10985/10474}
}

@CONFERENCE{10985-10444,
	address = {France},
	year = {2014},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {Bien que couramment utilisés pour la simulation numérique des procédés de mise en forme, les codes de calcul par éléments finis traditionnels et commerciaux ont plusieurs limitations. Certaines de ces limitations sont essentiellement dues aux lois de comportements qui sont phénoménologiques ne permettant pas de rendre compte des mécanismes physiques de plasticité qui ont lieu à des échelles plus fines ainsi que de l’évolution de la microstructure du matériau. Pour surmonter certaines de ses limitations, une méthode alternative serait de coupler les codes de calcul par éléments finis avec des modèles de comportement du matériau basés sur la micromécanique. Dans ce contexte, on se propose de coupler le code de calcul par éléments finis LAM3, dédié et adapté à la simulation numérique du procédé de laminage des produits plats, au code de simulation micromécanique basé sur la plasticité cristalline avec un schéma de transition d’échelles autocohérent appelé CRYSTALGD. Le couplage direct consiste à mettre en chaque point de Gauss du calcul par éléments finis une loi de comportement basée sur la plasticité polycristalline. Malgré tous les avantages que présente ce couplage, il est très lourd et requiert le traitement d’une masse importante de données, ce qui entraine un temps de calcul très élevé. Nous proposons dans ce papier une procédure simplifiée pour étudier l’évolution de la texture cristallographique dans les procédés de mise en forme. Nous appellerons cette procédure couplage indirect. Cela consiste à récupérer l’histoire du gradient de déformation locale d’un point matériau dans un calcul par éléments finis et ensuite l’utiliser pour le pilotage d’un modèle polycristallin. Cette technique sera appliquée pour étudier l’influence du trajet de chargement sur la réponse mécanique d’un matériau métallique sollicité en laminage. Le suivi de certains trajets de déformation, sélectionnés au cours du procédé de laminage, permettra également de prédire l’évolution de la texture du matériau ainsi que d’autres paramètres liés à sa microstructure. Nos résultats numériques seront comparés aux données expérimentales sur des aciers ferritiques fournis par Arcelormital.},
	edition = {Post-print},
	title = {Influence du trajet de chargement sur la réponse mécanique d’un matériau métallique},
	publisher = {Fédération Française de Matériaux},
	url = {http://hdl.handle.net/10985/10444}
}

@ARTICLE{10985-10023,
	journal = {International Journal of Applied Mechanics},
	volume = {6},
	pages = {27 p.},
	year = {2014},
	author = {PEERLINGS, Ron and GEERS, Marc G.D. and ABED-MERAIM, Farid },
	abstract = {The present contribution deals with the prediction of diffuse necking in the context of forming and stretching of metal sheets. For this purpose, two approaches are investigated, namely bifurcation and the maximum force principle, with a systematic comparison of their respective ability to predict necking. While the bifurcation approach is of quite general applicability, some restrictions are shown for the application of maximum force conditions. Although the predictions of the two approaches are identical for particular loading paths and constitutive models, they are generally different, which is even the case for elasticity, confirming the distinct nature of the two concepts. Closed-form expressions of the critical stress and strain states are derived for both criteria in elasto-plasticity and rigid-plasticity for a variety of hardening models. The resulting useful formulas in rigidplasticity are shown to also accurately represent the elasto-plastic critical states for small ratios of the hardening modulus with respect to Young's modulus. Finally, the well-known expression of Swift's diffuse necking criterion, whose foundations are attributed in the literature to the maximum force principle, is shown here to originate from the bifurcation approach instead, providing a sound justification for it.},
	issn = {1758-8251},
	edition = {Post-print},
	title = {Bifurcation analysis versus maximum force criteria in formability limit assessment of stretched metal sheets},
	number = {6},
	publisher = {World Scientific Publishing},
	url = {10.1142/S1758825114500641}
}

@ARTICLE{10985-17475,
	journal = {Latin American Journal of Solids and Structures},
	volume = {14},
	pages = {1872-1892},
	year = {2017},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified Gurson–Tvergaard–Needleman (GTN) damage model. To this end, both damage models coupled with elasto-plasticity and accounting for plastic anisotropy have been implemented into the ABAQUS/Explicit software, through the user-defined subroutine VUMAT, within the framework of large plastic strains and a fully three-dimensional formulation. The resulting constitutive frameworks are then combined with four localized necking criteria to predict the limit strains for an AA6016-T4 aluminum alloy. Three of these necking criteria are based on finite element (FE) simulations of the Nakazima deep drawing test with various specimen geometries, while the fourth criterion is based on bifurcation theory. The simulation results reveal that the limit strains predicted by local criteria, which are based on FE simulations of the Nakazima test, are in good agreement with the experiments for a number of strain paths, while those obtained with the bifurcation analysis provide an upper bound to the experimental FLD.},
	issn = {1679-7817},
	edition = {Pre-print},
	title = {Determination of forming limit diagrams based on ductile damage models and necking criteria},
	number = {10},
	publisher = {Argentinean Association of Computational Mechanics, Brazilian Association of Computational Mechanics, Mexican Association of Numerical Methods in Engineering and Applied Sciences},
	url = {10.1590/1679-78253481}
}

@ARTICLE{10985-10048,
	journal = {Key Engineering Materials},
	volume = {651-653},
	pages = {21-26},
	year = {2015},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The main objective of this contribution is to compare the Forming Limit Diagrams (FLDs) predicted by the use of two different vertex theories. The first theory is micromechanical and is based on the use of the Schmid law, within the framework of crystal plasticity coupled with the Taylor scale-transition scheme. The second theory is phenomenological and is based on the deformation theory of plasticity. For both theories, the mechanical behavior is formulated in the finite strain framework and is assumed to be isotropic and rate-independent. The theoretical framework of these approaches will be presented in details. In the micro-macro modeling, the isotropy is ensured by considering an isotropic initial texture. In the phenomenological modeling, the material parameters are identified on the basis of micro-macro simulations of tensile tests.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {A comparative study of Forming Limit Diagrams predicted by two different plasticity theories involving vertex effects},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.651-653.21}
}

@CONFERENCE{10985-10112,
	address = {France},
	pages = {4 pp.},
	booktitle = {CSMA 2015},
	year = {2015},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {L’objectif principal de cette étude est de prédire la texture de déformation et le comportement mécanique des aciers IF au cours du procédé de laminage des produits plats à faible taux de réduction. Un modèle basé sur l’homogénéisation autocohérente du comportement élastoplastique du monocristal est adopté pour modéliser le comportement de l’acier. Afin de réduire les temps de calcul dans la simulation multi-échelle, une procédure simplifiée est adoptée pour coupler le code de simulation numérique LAM3 au modèle de comportement basé sur la micromécanique.},
	edition = {Post-print},
	title = {Simulation multi-échelle du skin-pass des aciers IF : Prédiction de la texture de déformation et du comportement mécanique},
	url = {http://hdl.handle.net/10985/10112}
}

@CONFERENCE{10985-20341,
	address = {Belgique},
	booktitle = {Proceedings of the ICOMP'16},
	year = {2016},
	author = {BOUKTIR, Yasser and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {Plastic instabilities such as diffuse or localized necking may occur during sheet metal forming processes, thus limiting sheet metal formability, which is detrimental to industry. The formability of sheet metals is usually characterized by the concept of forming limit diagram (FLD), which was first proposed by Keeler and Backofen and Goodwin . The FLD reports combinations of in-plane major and minor strains, thus delimiting the plane into two zones: a safe zone and a critical one located above the FLD. It remains however that the experimental determination of FLDs is difficult, time consuming and involving non-negligible costs. To overcome these drawbacks, significant efforts have been devoted in the literature to develop theoretical criteria able to predict the formability limits of sheet metals, which are associated with the occurrence of diffuse or localized necking. For reliable predictions of sheet metal formability, one of the requirements is to develop an integrated approach coupling advanced constitutive models, capable of accurately reproducing the key physical phenomena that occur during forming processes, with theoretically well-founded necking criteria. In this work, a non-associative elastic‒plastic model, with Hill'48 anisotropic plastic yield surface, is coupled with the continuum damage mechanics theory based on the Lemaitre isotropic damage model. The resulting constitutive model is then combined with four bifurcation-based criteria, namely: General Bifurcation (GB) and Limit-Point Bifurcation (LPB) , for the prediction of diffuse necking, and Loss of Ellipticity (LE) and Loss of Strong Ellipticity (LSE), for the prediction of localized necking. The complete approach is implemented into the finite element code ABAQUS/Standard, within the framework of large strains and plane-stress conditions. A comparative study of the above bifurcation criteria is carried out on a mild steel, in order to classify them with respect to their order of prediction of critical necking strains.},
	edition = {Post-print},
	title = {Formability prediction of ductile materials using a non-associative plasticity model and bifurcation-based criteria},
	url = {http://hdl.handle.net/10985/20341}
}

@ARTICLE{10985-13535,
	journal = {International Journal for Numerical Methods in Engineering},
	volume = {108},
	pages = {363-422},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In an incremental formulation suitable to numerical implementation, the use of rate-independent theory of crystal plasticity essentially leads to four fundamental problems. The first is to determine the set of potentially active slip systems over a time increment. The second is to select the active slip systems among the potentially active ones. The third is to compute the slip rates (or the slip increments) for the active slip systems. And the last problem is the possible non-uniqueness of slip rates. The purpose of this paper is to propose satisfactory responses to the above-mentioned first three issues by presenting and comparing two novel numerical algorithms. The first algorithm is based on the usual return-mapping integration scheme, while the second follows the so-called ultimate scheme. The latter is shown to be more relevant and efficient than the former. These comparative performances are illustrated through various numerical simulations of the mechanical behavior of single crystals and polycrystalline aggregates subjected to monotonic and complex loadings. Although these algorithms are applied in this paper to Body-Centered-Cubic (BCC) crystal structures, they are quite general and suitable for integrating the constitutive equations for other crystal structures (e.g., FCC and HCP).},
	issn = {0029-5981},
	edition = {Post-print},
	title = {Numerical integration of rate-independent BCC single crystal plasticity models: comparative study of two classes of numerical algorithms},
	number = {5},
	publisher = {Wiley},
	url = {10.1002/nme.5215}
}

@ARTICLE{10985-17480,
	journal = {Engineering Computations},
	volume = {34},
	pages = {1413-1445},
	year = {2017},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {This paper proposes two linear solid‒shell finite elements for the three-dimensional modeling of thin structures in the context of explicit dynamic analysis. These solid‒shell formulations, which are extensions of their quasi-static counterparts, consist of a six-node prismatic element, denoted SHB6-EXP, and an eight-node hexahedral element, denoted SHB8PS-EXP. Both elements are formulated based on a purely three-dimensional approach, with displacements as the only degrees of freedom. To prevent various locking phenomena, a reduced-integration scheme is used along with the assumed-strain method. The resulting formulations are computationally efficient, since only a single layer of elements with an arbitrary number of through-thickness integration points is required to model 3D thin structures. Both SHB6-EXP and SHB8PS-EXP elements have been implemented into the explicit dynamic code ABAQUS, using the VUEL user-element subroutine. The performance of these elements is first assessed through a set of selective and representative dynamic elasto-plastic benchmark tests, including impact-type problems. Then, attention is directed to the simulation of deep drawing processes involving complex non-linear loading paths, anisotropic plasticity and double-sided contact. The obtained numerical results demonstrate the good performance of the SHB-EXP elements in the modeling of 3D thin structures, with only a single element layer and few integration points in the thickness direction.},
	issn = {0264-4401},
	edition = {Post-print},
	title = {Explicit dynamic analysis of sheet metal forming processes using linear prismatic and hexahedral solid‒shell elements},
	number = {5},
	publisher = {Emerald},
	url = {10.1108/EC-04-2016-0150}
}

@CONFERENCE{10985-10358,
	address = {Tunisie},
	year = {2011},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {Because accuracy and efficiency are the main features expected within the finite element (FE) method, the current contribution proposes a six-node prismatic solid–shell, denoted (SHB6). The formulation is extended here to geometric and material nonlinearities, and focus will be placed on its validation on nonlinear benchmark problems. This type of FE is specifically designed for the modeling of thin structures, by combining several useful shell features with some well-known solid element advantages. Therefore, the resulting derivation only involves displacement degrees of freedom as it is based on a fully 3D approach. Some of the motivation behind this formulation is to allow a natural mesh connection in problems where both structural (shell/plate) and continuum (solid) elements need to be simultaneously used. Another major interest of this prismatic solid–shell is to complement meshes that use hexahedral solid–shell FE, especially when free mesh generation tools are employed. To achieve an efficient formulation, the assumed-strain method is combined with an in-plane one-point quadrature scheme. These techniques are intended to reduce both locking phenomena and computational cost. A careful analysis of possible stiffness matrix rank deficiencies demonstrates that this reduced integration procedure does not induce hourglass modes and thus no stabilization is required.},
	edition = {Post-print},
	title = {Assumed-strain solid–shell formulation for the six-node finite element SHB6: evaluation on nonlinear benchmark problems},
	url = {http://hdl.handle.net/10985/10358}
}

@CONFERENCE{10985-10460,
	address = {France},
	year = {2014},
	author = {KPEKY, Fessal and BOUDAOUD, Hakim and DAYA, El Mostafa and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {Because vibrations often lead to noise and system dysfunction, they are therefore undesirable in many situations. One of the proposed ways developed in the literature to reduce vibrations is the use of sandwich structures with elastic faces and viscoelastic core. To accurately evaluate the damping properties of viscoelastic sandwich structures, a number of kinematic models and numerical methods have been proposed in the literature. Recently, a review and assessment of such approaches have been presented. This review shows that the simplified shell model with zigzag displacement layerwise theories leads generally to accurate solutions. However, some cases have been identified, where the proposed thin shell model is not sufficient. Indeed, the latter model guaranties the continuity of the displacements, but the stresses and strains are not accurately evaluated, especially when the layers of the structure have high contrast of stiffness or in terms of the hc/hf ratio. In the above-mentioned situations, an alternative approach could be the use of 3D finite element assemblies, but the number of degrees of freedom will increase significantly. In structural problems, a linear hexahedral solid-shell element has been developed, on the basis of a 3D formulation, and it has been shown to accurately account for the through-thickness phenomena while maintaining the CPU time at a reasonable level. In this work, the solid-shell concept will be combined with multilayers structures and its capabilities will be assessed through the analysis of dynamic response of viscoelastic sandwich structures. For illustration, some selective applications will be shown.},
	edition = {Post-print},
	title = {Dynamic response of viscoelastic multilayers structures using solid-shell finite elements},
	url = {http://hdl.handle.net/10985/10460}
}

@CONFERENCE{10985-19681,
	address = {Croatie},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The prediction of the ductility limit of sheet metals during forming processes represents nowadays and ambitious challenge. To reach this goal, a new numerical approach, based on the loss of ellipticity criterion [1], is proposed in this work. A polycrystalline model is implemented as a user-material (UMAT) into ABAQUS FE code. The polycrystalline aggregate is associated with each integration point of the FE mesh. To derive the mechanical behavior of this polycrystalline aggregate from the behavior of its microscopic constituents, the self-consistent model is used [2]. The mechanical behavior of the single crystals is described by a finite strain rate-independent constitutive framework, where the Schmid law is used to model the plastic flow. The condition of loss of ellipticity at the macroscale, where the macroscopic behavior is derived by using the self-consistent scheme, is used as ductility criterion in the FE modeling. This numerical approach, which couples the FE method with the self-consistent scheme, is used to simulate some forming processes (deep drawing process, Nakazima test…), and the above criterion is used to predict the ductility limit of the studied sheets during these operations.},
	edition = {Post-print},
	title = {Prediction of the ductility limit of sheet metals during forming processes using the loss of ellipticity approach},
	url = {http://hdl.handle.net/10985/19681}
}

@ARTICLE{10985-11855,
	journal = {International Journal of Mechanical Sciences},
	volume = {123},
	pages = {177-197},
	year = {2017},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {Prediction of necking limits in thin substrate-supported metal layers, which are typically used as functional components in electronic devices, represents nowadays an ambitious challenge. The specific purpose of the current work is, first, to numerically investigate the effect of kinematic hardening on localized necking in a freestanding metal layer. Second, the impact of adding a substrate layer on the ductility evolution of the resulting elastomer/metal bilayer will be analyzed. The materials in the metal and substrate layers are assumed to be isotropic, incompressible and strain-rate independent. The behavior of the metal layer is described by a rigid–plastic model with mixed (isotropic and kinematic) hardening. The isotropic hardening contribution is modeled by the Hollomon law, while kinematic hardening is modeled by the Armstrong–Frederick law. The substrate layer is made of elastomer material whose mechanical behavior is assumed to be hyperelastic and modeled by a neo-Hookean constitutive law. The Marciniak–Kuczynski imperfection analysis is used to predict plastic flow localization. Through various numerical simulations, the influence of kinematic hardening on localized necking as well as the impact of the addition of an elastomer layer are specifically emphasized. Comparisons with experimental results are also carried out to assess the relevance of incorporating kinematic hardening in the constitutive modeling of freestanding metal sheets.},
	issn = {0020-7403},
	edition = {Post-print},
	title = {Effect of kinematic hardening on localized necking in substrate-supported metal layers},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2016.12.002}
}

@CONFERENCE{10985-20362,
	address = {Croatie},
	booktitle = {Determination of forming limit diagrams based on ductile damage models and necking criteria},
	year = {2016},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this paper, forming limit diagrams (FLDs) for an aluminum alloy are predicted through numerical simulations using various localized necking criteria. A comparative study is conducted for the FLDs determined by using the Lemaitre damage approach and those obtained with the modified GursonTvergaardNeedleman (GTN) damage model. To this end, both damage models coupled with elasto-plasticity and accounting for plastic anisotropy have been implemented into the ABAQUS/Explicit software, through the user-defined subroutine VUMAT, within the framework of large plastic strains and a fully three-dimensional formulation. The resulting constitutive frameworks are then combined with four localized necking criteria to predict the limit strains for an AA6016-T4 aluminum alloy. Three of these necking criteria are based on finite element (FE) simulations of the Nakazima deep drawing test with various specimen geometries, while the fourth criterion is based on bifurcation theory. The simulation results reveal that the limit strains predicted by local criteria, which are based on FE simulations of the Nakazima test, are in good agreement with the experiments for a number of strain paths, while those obtained with the bifurcation analysis provide an upper bound to the experimental FLD.},
	edition = {Post-print},
	title = {Determination of forming limit diagrams based on ductile damage models and necking criteria},
	publisher = {ACEX},
	url = {http://hdl.handle.net/10985/20362}
}

@ARTICLE{10985-11234,
	journal = {Procedia Structural Integrity},
	volume = {2},
	pages = {3577-3584},
	year = {2016},
	author = {MSOLLI, Sabeur and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {It is well known that both damage and plastic anisotropy strongly affect the ductility limit of thin metal sheets. Due to the manufacturing processes, initial defects, such as inclusions and voids, are commonly present in the produced sheet metals. Plastic anisotropy is a direct outcome of the rolling process, where the resulting metal sheets exhibit preferred crystallographic orientations or strong texture. In the present study, the combined effect of plastic anisotropy and damage on localized necking is numerically investigated and analyzed. To this aim, an improved version of the Gurson-Tvergaard-Needleman (GTN) constitutive framework is used to model the mechanical behavior of the studied sheet. This version, which is an extension of the original GTN model, incorporates Hill’s anisotropic yield function to take into account the plastic anisotropy of the matrix material. Particular attention is devoted to the derivation of the analytical tangent modulus associated with this constitutive model. This extended GTN model is successfully coupled with bifurcation theory to predict sheet metal ductility limits, which are represented in terms of forming limit diagrams (FLDs). The effect of some material parameters (e.g.,anisotropy parameters of the metallic matrix) on the shape and the location of the predicted FLDs is then investigated and discussed through numerical simulations.},
	issn = {2452-3216},
	edition = {Post-print},
	title = {Combined effect of damage and plastic anisotropy on the ductility limit of thin metal sheets},
	publisher = {ESIS - Elsevier},
	url = {10.1016/j.prostr.2016.06.446}
}

@CONFERENCE{10985-20336,
	address = {Portugal},
	isbn = {978-88-7488-963-1},
	year = {2016},
	author = {KPEKY, Fessal and DAYA, El Mostafa and ABED-MERAIM, Farid },
	abstract = {In this work, we present finite element models based on the solid–shell approach, which have been specifically designed for the modeling of multilayer structures. The originality in the current study lies in the analysis of variability in the design parameters, which could be of geometric or material type. The first type of imperfections generally results from the manufacturing of such structures [1], while the second source of variability arises from the mechanical parameters of the same material, as identified in the literature (e.g., Aluminum Young modulus equal to 70.3 GPa in [2], while estimated as 69 GPa in [3]). Therefore, it is of importance to assess the influence of these uncertainties on the design of actual structures. To this end, several studies have been proposed in the literature, among which in reference [4], the MSP (Modal Stability Procedure) was combined with the MCS (Monte Carlo Simulation). The approach we propose is rather simple and is based on the uncertainty on the actual values of several parameters in some well-defined intervals. The developed method is applied to modeling the vibrations of multilayer shell structures made of elastic layers, viscoelastic and piezoelectric materials. The resulting problem is discretized by linear and quadratic solid–shell finite elements developed in [5, 6] and extended to viscoelastic sandwich structures in [7]. To solve the associated nonlinear equations, we adopt the method that couples the homotopy to ANM (Asymptotic Numerical Method) and AD (Automatic Differentiation) proposed in [8]. The obtained results provide information on the tolerance margin of error that can be committed without compromising structural integrity.},
	edition = {Post-print},
	title = {Influence of variability in geometric and material parameters on the damping properties of multilayer structures},
	publisher = {Esculapio (AJM Ferreira et al.)},
	url = {10.15651/978-88-748-8963-1}
}

@CONFERENCE{10985-10459,
	address = {Australie},
	year = {2010},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {Over the last decade, considerable progress has been made in the development of three-dimensional finite elements capable of modeling thin structures. The coupling between solid and shell formulations has proven to be an interesting way to provide continuum finite element models that can be efficiently used for structural applications. The current work proposes the formulation of two solid-shell elements based on a purely three-dimensional approach. These elements have numerous advantages for the analysis of various complex structural geometries that are common in many industrial applications. Their main advantage is to allow such complex structural shapes to be meshed without classical problems of connecting zones meshed with different element types (continuum and structural elements for instance). Another important benefit of solid-shell elements is the avoidance of tedious pure-shell element formulations needed for the complex treatment of large rotations. The two solid-shell elements developed are a 20-node and a 15-node element, respectively, with displacements as the only degrees of freedom. They also have a special direction called “the thickness”. Therefore, they can be used for the modeling of thin structures, while providing an accurate description of various through-thickness phenomena thanks to the use of a set of integration points in that direction. A reduced integration scheme has been introduced to prevent some locking phenomena and increase computational efficiency. To assess the effectiveness of the proposed solid-shell elements, a set of popular benchmark problems is investigated, involving linear as well as geometric nonlinear analyses. It is shown that these elements can support high aspect ratios, up to 500, and are especially efficient for elastoplastic bending behavior. The various numerical experiments in linear and nonlinear situations reveal that these solid-shell elements perform really better than standard solid elements having similar properties in terms of geometry, interpolation and degrees of freedom.},
	edition = {Post-print},
	title = {Formulation of new quadratic solid-shell elements and their evaluation on popular benchmark problems},
	url = {http://hdl.handle.net/10985/10459}
}

@CONFERENCE{10985-7484,
	address = {France},
	pages = {1-6},
	booktitle = {Congrès français de mécanique (21 ; 2013 ; Bordeaux (Gironde)).},
	year = {2013},
	author = {ALTMEYER, Guillaume and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {Many criteria have been developed during last decades to predict diffuse or localized necking and shear banding. The lack of confrontation of these models with each other on relevant applications makes their choice difficult for the designer. It is proposed to reformulate these plastic instability criteria in an unified framework, to compare their theoretical bases to establish links between them and then to highlighten their limitations. In the case of diffuse necking, a comparison is made between the criteria based on bifurcation analysis and on those based on maximum force principle for elastic-plastic materials. In the case of localized modes, it is shown that the predictions of the Marciniak – Kuczynski approach, based on a multizone model, tend to those of the loss of ellipticity criterion when the initial defect size tends to zero (no initial defect introduced). In the case of elasto-viscoplastic behavior, an approach based on a linear stability analysis is mentioned.},
	edition = {Post-print},
	title = {Overview of the theoretical relations between necking and strain localization criteria.},
	url = {http://hdl.handle.net/10985/7484}
}

@ARTICLE{10985-10026,
	journal = {Key Engineering Materials},
	volume = {504-506},
	pages = {35-40},
	year = {2012},
	author = {MANSOURI, Lotfi and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {In this work, we propose to couple the Gurson-Tvergaard-Needleman (GTN) model, known for its widespread use to describe damage evolution in metallic materials, to the Rice localization criterion. The implementation of the constitutive modeling is achieved via a user material (UMAT) subroutine in the commercial finiteelement code ABAQUS. Large deformations are taken into account within a three dimensional co-rotational framework. The effectiveness of the proposed coupling for the prediction of the formability of stretched metal sheets is shown and Forming Limit Diagrams (FLDs) are plotted for an Aluminum alloy. A sensitivity analysis with respect to hardening parameters is carried out, andit is shown that these effects are much smaller for the case of the Rice criterion when compared toclassical criteria commonly utilized in metal forming.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Plastic Instability Based on Bifurcation Analysis: Effect of Hardening and Gurson Damage Parameters on Strain Localization},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.504-506.35}
}

@ARTICLE{10985-17481,
	journal = {Composite Structures},
	volume = {172},
	pages = {282-296},
	year = {2017},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {The current contribution proposes two quadratic, prismatic and hexahedral, solid–shell elements for the geometric nonlinear analysis of laminated composite structures. The formulation of the proposed solid–shell elements is based on a fully three-dimensional approach combining the assumed-strain method and the reduced-integration technique. In particular, only translational degrees of freedom are considered in the formulation and a preferential direction is chosen as the thickness direction, along which an arbitrary number of integration points are arranged. Making use of different physical local frames, these elements are coupled with fully three-dimensional orthotropic constitutive equations, which allows modeling multilayered composite structures with only a single element layer through the thickness. A series of popular nonlinear benchmark tests for laminated composite structures is performed to assess the performance of the proposed SHB elements. Compared to reference solutions taken from the literature, the results provided by the SHB elements show excellent agreement. Moreover, on the whole, the proposed SHB elements perform better than state-of-the-art ABAQUS elements, which have the same geometry and kinematics, using comparable mesh discretizations.},
	issn = {0263-8223},
	edition = {Pre-print},
	title = {Quadratic prismatic and hexahedral solid‒shell elements for geometric nonlinear analysis of laminated composite structures},
	publisher = {Elsevier},
	url = {10.1016/j.compstruct.2017.03.091}
}

@ARTICLE{10985-10228,
	journal = {Computing},
	volume = {95},
	pages = {373-394},
	year = {2013},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {This paper is concerned with the development of a new family of solid- shell finite elements. This concept of solid-shell elements is shown to have a number of attractive computational properties as compared to conventional three-dimensional elements. More specifically, two new solid-shell elements are formulated in this work (a fifteen-node and a twenty-node element) on the basis of a purely three-dimensional approach. The performance of these elements is shown through the analysis of various structural problems. Note that one of their main advantages is to allow complex structural shapes to be simulated without classical problems of connecting zones meshed with different element types. These solid-shell elements have a special direction denoted as the "thickness", along which a set of integration points are located. Reduced integration is also used to prevent some locking phenomena and to increase computational efficiency. Focus will be placed here on linear benchmark problems, where it is shown that these solid-shell elements perform much better than their counterparts, conventional solid elements.},
	issn = {0010-485X},
	edition = {Post-print},
	title = {New quadratic solid-shell elements and their evaluation on linear benchmark problems},
	number = {5},
	publisher = {Springer Verlag},
	url = {10.1007/s00607-012-0265-1}
}

@ARTICLE{10985-11189,
	journal = {Latin American Journal of Solids and Structures},
	volume = {13},
	pages = {2231-2250},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The aim of this paper is to investigate the impact of the microscopic yield surface (i.e., at the single crystal scale) on the forming limit diagrams (FLDs) of face centred cubic (FCC) materials. To predict these FLDs, the bifurcation approach is used within the framework of rate-independent crystal plasticity theory. For this purpose, two micromechanical models are developed and implemented. The first one uses the classical Schmid law, which results in the formation of vertices (or corners) at the yield surface, while the second is based on regularization of the Schmid law, which induces rounded corners at the yield surface. In both cases, the overall macroscopic behavior is derived from the behavior of the microscopic constituents (the single crystals) by using two different scale-transition schemes: the selfconsistent approach and the Taylor model. The simulation results show that the use of the classical Schmid law allows predicting localized necking at realistic strain levels for the whole range of strain paths that span the FLD. However, the application of a regularized Schmid law results in much higher limit strains in the range of negative strain paths. Moreover, rounding the yield surface vertices through regularization of the Schmid law leads to unrealistically high limit strains in the range of positive strain paths.},
	issn = {1679-7817},
	edition = {Post-print},
	title = {Influence of the Yield Surface Curvature on the Forming Limit Diagrams Predicted by Crystal Plasticity Theory},
	number = {12},
	publisher = {Argentinean Association of Computational Mechanics, Brazilian Association of Computational Mechanics, Mexican Association of Numerical Methods in Engineering and Applied Sciences},
	url = {10.1590/1679-78252456}
}

@ARTICLE{10985-10107,
	journal = {Materials Science and Engineering: A},
	volume = {528},
	pages = {3777-3785},
	year = {2011},
	author = {FRANZ, Gérald and BEN ZINEB, Tarak and LEMOINE, Xavier and BERVEILLER, Marcel and ABED-MERAIM, Farid },
	abstract = {In this paper, the effects of microstructure and deformation mechanisms on the ductility of multiphase steels are investigated. To this end, a formability criterion based on loss of ellipticity of the boundary value problem is coupled with an advanced multiscale model accounting for intragranular microstructure development and evolution. The spatially heterogeneous distribution of dislocations inside the grain is represented by three types of local dislocation densities. The resulting large strain elastic-plastic single crystal constitutive law (based on crystal plasticity) is incorporated into a self-consistent scale-transition scheme. The present contribution focuses on the relationship between the intragranular microstructure of B.C.C. steels and their ductility. The model allows interesting comparisons in terms of formability limits for different dislocation networks, during monotonic loading tests applied to polycrystalline aggregates.},
	issn = {0921-5093},
	edition = {Post-print},
	title = {Impact of intragranular microstructure development on ductility limits of multiphase steels},
	number = {10-11},
	publisher = {Elsevier},
	url = {10.1016/j.msea.2011.01.042}
}

@CONFERENCE{10985-10356,
	address = {France},
	pages = {8 p.},
	booktitle = {Actes du 11ème Colloque National en Calcul des Structures},
	year = {2013},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {Dans cet article, la formulation de deux éléments finis de type coque volumique sera présentée. Il s’agit d’un hexaèdre à vingt nœuds et d’un prisme à quinze nœuds obtenus à partir d’une approche purement tridimensionnelle. Ce concept solide-coque procure de nombreux avantages par rapport aux éléments finis traditionnels solides ou coques, puisqu’il consiste à combiner en une seule formulation certaines bonnes caractéristiques des coques avec quelques bonnes propriétés des solides. A noter que les éléments coques volumiques ainsi obtenus possèdent une direction privilégiée, le long de laquelle les points d’intégration sont disposés, et une intégration réduite dans le plan de l’élément est adoptée pour réduire un certain nombre de verrouillages et pour augmenter l’efficacité de calcul de ces éléments. Au travers de cas tests représentatifs, les performances de ces éléments sont montrées.},
	edition = {Post-print},
	title = {Formulation d’éléments finis quadratiques de type solide-coque et leur évaluation sur des cas tests standards},
	url = {http://hdl.handle.net/10985/10356}
}

@CONFERENCE{10985-10442,
	address = {France},
	year = {2014},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {Commercial finite element software packages are widely used for the numerical simulation of sheet metal forming processes. However, most of existing software packages present some limitations. In particular, they are essentially based on phenomenological constitutive models and, accordingly, they do not precisely account for physical mechanisms of plasticity that take place at finer scales, or the associated microstructure evolution. In this context, we propose to couple the Abaqus finite element code and the LAM3 code with micromechanical simulation techniques based on crystal plasticity and a self-consistent scale-transition scheme. This coupling strategy will be applied to the simulation of rolling processes in order to assess the influence of the loading path on the evolution of the mechanical properties of the material. By following some appropriately selected strain paths along the rolling process, one can predict the texture evolution of the material as well as other parameters related to its microstructure. Our numerical results are compared with experimental data in the case of ferritic steels elaborated by the steel maker ArcelorMittal.},
	edition = {Post-print},
	title = {Influence of the loading path on the mechanical behavior of metallic materials},
	url = {http://hdl.handle.net/10985/10442}
}

@CONFERENCE{10985-10436,
	address = {France},
	pages = {5 p.},
	booktitle = {Actes du 22ème Congrès Français de Mécanique},
	year = {2015},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {L’objectif principal de cette étude est de prédire la texture la texture de déformation et le comportement mécanique des aciers IF au cours du procédé de laminage des produits plats à faible taux de réduction. Un modèle basé sur l’homogénéisation autocohérente du comportement élastoplastique du monocristal est adopté pour modéliser le comportement de l’acier. Afin de réduire les temps de calcul dans la simulation multi-échelle, une procédure simplifiée est adoptée pour coupler le code de simulation numérique LAM3 au modèle de comportement basé sur la micromécanique.},
	edition = {Post-print},
	title = {Simulation multi-échelle du skin-pass des aciers IF : Prédiction de la texture de déformation et du comportement mécanique},
	publisher = {Association Française de Mécanique},
	url = {http://hdl.handle.net/10985/10436}
}

@CONFERENCE{10985-20338,
	address = {République tchèque},
	year = {2016},
	author = {KPEKY, Fessal and DAYA, El Mostafa and ABED-MERAIM, Farid },
	abstract = {The modeling of piezoelectric structures has been the subject of active research in recent decades (Tzou et al., 1994; Benjeddou et al., 1997; Klinkel and Wagner, 2006). However, advanced finite element technologies that are capable of efficiently modeling multilayer structures with high geometric contrast are still lacking. In this work, we propose piezoelectric extensions to recently developed solid-shell elements (Abed-Meraim and Combescure, 2009; Trinh et al., 2011; Abed-Meraim et al., 2013). For this purpose, we performed an electromechanical coupling, which consists in adding an electrical degree of freedom to each node of these elements. To increase efficiency, these elements are provided with a special direction, designated as the thickness, along which the integration points are located, while adopting a reduced integration rule in the other directions. To assess the performance of the proposed piezoelectric solid-shell elements, a variety of benchmark problems, both in static and vibration analysis, have been conducted on multilayer structures ranging from simple beams to more complex structures involving geometric nonlinearities. Compared to traditional finite elements with the same kinematics, the evaluation results allow emphasizing the higher performance of the newly developed solid-shell concept.},
	edition = {Post-print},
	title = {New Linear and Quadratic Piezoelectric Solid-Shell Finite Elements},
	url = {http://hdl.handle.net/10985/20338}
}

@CONFERENCE{10985-13034,
	address = {Espagne},
	pages = {12p.},
	booktitle = {Proceedings of the 8th ECCOMAS Thematic Conference on Smart Structures and Materials},
	year = {2017},
	author = {KPEKY, Fessal and DAYA, El Mostafa and ABED-MERAIM, Farid },
	abstract = {This paper presents an assessment of the performances of new piezoelectric solid−shell finite elements. Compared to conventional solid and shell elements, the solid–shell concept reveals to be very attractive, due to a number of well-established advantages and computational capabilities. This paper focuses on two element formulations, denoted SHB15E and SHB20E, which represent a quadratic prismatic solid−shell element and its hexahedral counterpart, respectively. The current analysis consists in an evaluation of primal and dual variables during the process of shape control of structures. The interest in this solid–shell approach is shown through a set of selective and representative plate and shell benchmark problems. The results obtained by the proposed formulations are compared with those given by state-of-the-art piezoelectric elements available in ABAQUS.},
	edition = {Post-print},
	title = {Analysis of primal and dual variables in structural shape control by piezoelectric patches using solid-shell finite elements},
	publisher = {A. Güemes, A. Benjeddou , J. Rodellar and Jinsong Leng},
	url = {http://hdl.handle.net/10985/13034}
}

@ARTICLE{10985-10061,
	journal = {Advanced Science Letters},
	volume = {19},
	pages = {346-350},
	year = {2013},
	author = {FRANZ, Gérald and BEN ZINEB, Tarak and ABED-MERAIM, Farid },
	abstract = {The current work aims to investigate the impact of microstructural and physical mechanisms on the macroscopic behavior and ductility of single-phase steels. For this purpose, an advanced multiscale model, accounting for intragranular microstructure development and evolution, is coupled with a formability limit criterion based on bifur- cation theory. The overall response for polycrystalline aggregates is obtained from a large-strain elastic-plastic single crystal constitutive law, using a self-consistent scale-transition scheme. This approach takes into account essential microstructural aspects such as initial and induced textures, dislocation densities, softening mecha- nisms so that the behav uring complex loading paths is properly described. Focus will be placed here on the relationship between intragranular microstructure of B.C.C. steels and their ductility. The model allows interesting qualitative study in terms of formability limits for various dislocation networks, during monotonic loading tests applied to single-phase steels, with the aim of helping in the design of new materials.},
	issn = {0976-397X},
	edition = {Post-print},
	title = {Effect of microstructural and physical mechanisms on mechanical properties of single-phase steels},
	number = {1},
	publisher = {American Scientific Publishers},
	url = {10.1166/asl.2013.4710}
}

@CONFERENCE{10985-20342,
	address = {France},
	volume = {1769},
	pages = {7p.},
	booktitle = {Proceedings of the 19th International ESAFORM Conference on Material Forming (ESAFORM 2016)},
	year = {2016},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {A family of linear and quadratic assumed-strain based solid‒shell elements (SHB) is presented in this paper to simulate 3D thin structural problems including both quasi-static and dynamic analyses. The SHB solid‒shell elements are based on a three-dimensional formulation, with only displacements as degrees of freedom, and a reduced integration technique with an arbitrary number of integration points along the thickness direction, which enables them to model 3D thin structures with only one layer of elements through the thickness. All SHB elements have been successfully implemented into ABAQUS dynamic/explicit and static/implicit codes. Several static and dynamic benchmark tests as well as sheet metal forming process simulations, involving large strain, material nonlinearity and contact, have been conducted to assess the performance of the SHB elements.},
	edition = {Post-print},
	title = {On the use of solid–shell elements for thin structures: Application to impact and sheet metal forming simulations},
	number = {1},
	publisher = {AIP},
	url = {10.1063/1.4963460}
}

@ARTICLE{10985-6871,
	journal = {Archive of Applied Mechanics},
	volume = {82},
	pages = {1269-1290},
	year = {2012},
	author = {SALAHOUELHADJ, Abdellah and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {This paper proposes an extension of the SHB8PS solid–shell finite element to large strain anisotropic elasto-plasticity, with application to several non-linear benchmark tests including sheet metal forming simulations. This hexahedral linear element has an arbitrary number of integration points distributed along a single line, defining the "thickness" direction; and to control the hourglass modes inherent to this reduced integration, a physical stabilization technique is used. In addition, the assumed strain method is adopted for the elimination of locking. The implementation of the element in Abaqus/Standard via the UEL user subroutine has been assessed through a variety of benchmark problems involving geometric non-linearities, anisotropic plasticity, large deformation and contact. Initially designed for the efficient simulation of elastic–plastic thin structures, the SHB8PS exhibits interesting potentialities for sheet metal forming applications – both in terms of efficiency and accuracy. The element shows good performance on the selected tests, including springback and earing predictions for Numisheet benchmark problems.},
	issn = {0939-1533},
	edition = {Post-print},
	title = {Application of the continuum shell finite element SHB8PS to sheet forming simulation using an extended large strain anisotropic elastic–plastic formulation},
	number = {9},
	publisher = {Springer Verlag},
	url = {10.1007/s00419-012-0620-x}
}

@ARTICLE{10985-6870,
	journal = {International Journal of Mechanical Sciences},
	volume = {59},
	pages = {104-114},
	year = {2012},
	author = {RACZ, Sever-Gabriel and CHALAL, Hocine and BALAN, Tudor},
	abstract = {The springback behavior of four advanced high-strength sheet steels (Dual-Phase, TRIP, ferrite-bainite) with thicknesses ranging from 1.2 to 4 mm was investigated by means of the bending-under-tension (BUT) test. The applicability of several guidelines from the literature was investigated experimentally and numerically. The monotonic decrease of springback as back force increased was confirmed for this category of sheet steels, and a general trend for the non-linear influence of the tool radius was observed. The influence of numerical factors on the predicted values of springback was investigated, and conclusions and simple guidelines were drawn from the analysis with industrial sheet forming applications in mind.},
	issn = {0020-7403},
	edition = {Post-print},
	title = {Springback of thick sheet AHSS subject to bending under tension},
	number = {1},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2012.03.011}
}

@ARTICLE{10985-10161,
	journal = {International Journal of Material Forming},
	pages = {1-14},
	year = {2016},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {The main objective of this study is to simulate texture and deformation during the temper-rolling process. To this end, a rate-independent crystal plasticity model, based on the self-consistent scale-transition scheme, is adopted to predict texture evolution and deformation heterogeneity during temper-rolling process. For computational efficiency, a decoupled analysis is considered between the polycrystalline plasticity model and the finite element analysis for the temper rolling. The elasto-plastic finite element analysis is first carried out to determine the history of velocity gradient during the numerical simulation of temper rolling. The thus calculated velocity gradient history is subsequently applied to the polycrystalline plasticity model. By following some appropriately selected strain paths (i.e., streamlines) along the rolling process, one can predict the texture evolution of the material at the half thickness of the sheet metal as well as other parameters related to its microstructure. The numerical results obtained by the proposed strategy are compared with experimental data in the case of IF steels.},
	issn = {1960-6206},
	edition = {Post-print},
	title = {Investigation of the effect of temper rolling on the texture evolution and mechanical behavior of IF steels using multiscale simulation},
	publisher = {Springer Verlag},
	url = {10.1007/s12289-015-1257-4}
}

@ARTICLE{10985-10197,
	journal = {Structural Engineering and Mechanics},
	volume = {38},
	pages = {767-802},
	year = {2011},
	author = {LEAHU-ALUAS, Ion and ABED-MERAIM, Farid },
	abstract = {Developers of new finite elements or nonlinear solution techniques rely on discriminative benchmark tests drawn from the literature to assess the advantages and drawbacks of new formulations. Buckling benchmark tests provide a rigorous evaluation of finite elements applied to thin structures, and a complete and detailed set of reference results would therefore prove very useful in carrying out such evaluations. Results are usually presented in the form of load-deflection curves that developers must reconstruct by extracting the points, a procedure which is often tedious and inaccurate. Moreover the curves are usually given without accompanying information such as the calculation time or number of iterations it took for the model to converge, even though this type of data is equally important in practice. This paper presents ten different limit-point buckling benchmark tests, and provides for each one the reference load-deflection curve, all the points necessary to recreate the curve in tabulated form, analysis data such as calculation time, number of iterations and increments, and all of the inputs used to obtain these results.},
	issn = {1225-4568},
	edition = {Post-print},
	title = {A proposed set of popular limit-point buckling benchmark problems},
	number = {6},
	publisher = {Techno-press Ltd},
	url = {10.12989/sem.2011.38.6.767}
}

@ARTICLE{10985-10440,
	journal = {Materials and Design},
	volume = {90},
	pages = {969–978},
	year = {2016},
	author = {BOUKTIR, Yasser and HADDAD, Moussa and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {The ductility limits of an St14 steel are investigated using an elastic‒plastic‒damage model and bifurcation theory. An associative J2-flow theory of plasticity is coupled with damage within the framework of continuum damage mechanics. For strain localization prediction, the bifurcation analysis is adopted. Both the constitutive equations and the localization bifurcation criterion are implemented into the finite element code ABAQUS, within the framework of large strains and a fully three-dimensional formulation. The material parameters associated with the fully coupled elastic‒plastic‒damage model are calibrated based on experimental tensile tests together with an inverse identification procedure. The above-described approach allows the forming limit diagrams of the studied material to be determined, which are then compared with experimental measurements. A main conclusion of the current study is that the proposed approach is able to provide predictions that are in good agreement with experiments under the condition of accurate material parameter calibration. The latter requires a careful identification strategy based on both calibrated finite element simulations of tensile tests at large strains and appropriately selected necking measurements. The resulting approach represents a useful basis for setting up reliable ductility limit prediction tools as well as effective parameter identification strategies.},
	issn = {0264-1275},
	edition = {Post-print},
	title = {Investigation of ductility limits based on bifurcation theory coupled with continuum damage mechanics},
	publisher = {Elsevier},
	url = {10.1016/j.matdes.2015.11.052}
}

@CONFERENCE{10985-10071,
	address = {Pologne},
	isbn = {978-351400797-0},
	pages = {315-318},
	booktitle = {Metal Forming 2012 proceedings of the 14th International Conference on Metal Forming},
	year = {2012},
	author = {SALAHOUELHADJ, Abdellah and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this paper, the performance of the solid-shell finite element SHB8PS is assessed in the context of sheet metal forming simulation using anisotropic elastic-plastic behavior models. This finite element technology has been implemented into the commercial implicit finite element code Abaqus/Standard via the UEL subroutine. It consists of an eight-node three-dimensional hexahedron with reduced integration, provided with an arbitrary number of integration points along the thickness direction. The use of an in-plane reduced integration scheme prevents some locking phenomena, resulting in a computationally efficient formulation when compared to conventional 3D solid elements. Another interesting feature lies in the possibility of increasing the number of through-thickness integration points within a single element layer, which enables an accurate description of various phenomena in sheet forming simulations. A general elastic-plastic model has been adopted in the constitutive modeling for sheet forming applications with plastic anisotropy. As an illustrative example, the performance of the element is shown in the earing prediction of a cylindrical cup drawing process.},
	issn = {16113683},
	edition = {Post-print},
	title = {Evaluation of a new solid-shell finite element on the simulation of sheet metal forming processes},
	publisher = {Wiley},
	url = {http://hdl.handle.net/10985/10071}
}

@ARTICLE{10985-11856,
	journal = {International Journal of Plasticity},
	volume = {91},
	pages = {205-237},
	year = {2017},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The present study focuses on the development of a relevant numerical tool for predicting the onset of localized necking in polycrystalline aggregates. The latter are assumed to be representative of thin metal sheets. In this tool, a micromechanical model, based on the rate-independent self-consistent multi-scale scheme, is developed to accurately describe the mechanical behavior of polycrystalline aggregates from that of their single crystal constituents. In the current paper, the constitutive framework at the single crystal scale follows a finite strain formulation of the rate-independent theory of crystal elastoplasticity. To predict the occurrence of localized necking in polycrystalline aggregates, this micromechanical modeling is combined with two main strain localization approaches: the bifurcation analysis and the initial imperfection method. The formulation of both strain localization indicators takes into consideration the plane stress conditions to which thin metal sheets are subjected during deformation. From a numerical point of view, strain localization analysis with this crystal plasticity approach can be viewed as a strongly nonlinear problem. Hence, several numerical algorithms and techniques are developed and implemented in the aim of efficiently solving this non-linear problem. Various simulation results obtained by the application of the developed numerical tool are presented and extensively discussed. It is demonstrated from these results that the predictions obtained with the MarciniakeKuczynski procedure tend towards those yielded by the bifurcation theory, when the initial imperfection ratio tends towards zero. Furthermore, the above result is shown to be valid for both scale-transition schemes, namely the full-constraint Taylor model and self-consistent scheme.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Localized necking predictions based on rate-independent self-consistent polycrystal plasticity: Bifurcation analysis versus imperfection approach},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2017.02.001}
}

@ARTICLE{10985-17477,
	journal = {Computational Mechanics},
	volume = {59},
	pages = {161–186},
	year = {2017},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this paper, two quadratic solid‒shell (SHB) elements are proposed for the three-dimensional modeling of thin structures. These consist of a twenty-node hexahedral solid‒shell element, denoted SHB20, and its fifteen-node prismatic counterpart, denoted SHB15. The formulation of these elements is extended in this work to include geometric and material nonlinearities, for application to problems involving large displacements and rotations as well as plasticity. For this purpose, the SHB elements are coupled with large-strain anisotropic elasto-plastic constitutive equations for metallic materials. Although based on a purely three-dimensional approach, several modifications are introduced in the formulation of these elements to provide them with interesting shell features. In particular, a special direction is chosen to represent the thickness, along which a user-defined number of integration points are located. Furthermore, for efficiency requirements and for alleviating locking phenomena, an in-plane reduced-integration scheme is adopted. The resulting formulations are implemented into the finite element software ABAQUS/Standard and, to assess their performance, a variety of nonlinear benchmark problems are investigated. Attention is then focused on the simulation of various complex sheet metal forming processes, involving large strain, anisotropic plasticity, and double-sided contact. From all simulation results, it appears that the SHB elements represent an interesting alternative to traditional shell and solid elements, due to their versatility and capability of accurately modeling selective nonlinear benchmark problems as well as complex sheet metal forming processes.},
	issn = {0178-7675},
	edition = {Pre-print},
	title = {Quadratic solid‒shell elements for nonlinear structural analysis and sheet metal forming simulation},
	number = {1},
	publisher = {Springer Verlag},
	url = {10.1007/s00466-016-1341-8}
}

@ARTICLE{10985-13154,
	journal = {International Journal of Advanced Manufacturing Technology},
	volume = {92},
	pages = {3461-3480},
	year = {2017},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {Due to their good mechanical and technological performances, thin substrate-supported metal layers are increasingly used as functional components in flexible electronic devices. Consequently, the prediction of necking, and the associated limit strains, for such components is of major academic and industrial importance. The current contribution aims to numerically investigate the respective and combined effects of strain rate sensitivity of the metal layer and the addition of an elastomer layer on localized necking in substrate-supported metal layers. To this end, strain ratedependent forms for the flow theory of plasticity and the deformation theory counterpart are used to describe the mechanical behavior of the metal layer. As to the substrate layer, it is made of elastomer material whose mechanical response is described by a neo-Hookean hyperelastic model. The two layers are assumed to be perfectly adhered. Necking limit strains are predicted by the Marciniak–Kuczynski (M–K) imperfection approach. Various numerical results, corresponding to freestanding metal layers as well as substrate-supported metal layers, are presented and extensively discussed in this paper. The significant effect of strain rate sensitivity on the retardation of localized necking is first emphasized. Then, the combined and positive influence of strain rate sensitivity of the metal layer and characteristics of the elastomer layer (thickness and stiffness) on the enhancement of the ductility of the whole bilayer is analyzed and discussed.},
	issn = {0268-3768},
	edition = {Post-print},
	title = {Strain rate effects on localized necking in substrate-supported metal layers},
	number = {9-12},
	publisher = {Springer Verlag},
	url = {10.1007/s00170-017-0344-8}
}

@CONFERENCE{10985-20345,
	address = {Portugal},
	booktitle = {International Conference New Trends on Integrity, Reliability and Failure (IRF2016)},
	year = {2016},
	author = {BOUKTIR, Yasser and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this work, an elastic–plastic model with Hill’48 anisotropic yield surface is coupled with the continuum damage mechanics theory and combined with the bifurcation analysis, in order to predict strain localization in thin sheet metals. The resulting approach is implemented into the ABAQUS finite element code within the framework of large strains and plane-stress conditions. A sensitivity analysis with respect to hardening and damage parameters is carried out to identify the most influential parameters on strain localization predictions.},
	edition = {Post-print},
	title = {Effect of hardening and damage parameters on the prediction of localized necking in thin sheet metals},
	url = {http://hdl.handle.net/10985/20345}
}

@CONFERENCE{10985-18916,
	address = {France},
	isbn = {978-1-5108-3167-4},
	volume = {80},
	pages = {154-160},
	booktitle = {MATEC Web of Conference-15-Numiform2016},
	year = {2016},
	author = {BEN BETTAIEB, Mohamed and LAGAZA, Honoré and LEMOINE, Xavier and ABED-MERAIM, Farid },
	abstract = {A number of parts and components involved in the automotive industry are made of thin bent sheets. Unfortunately, the classical predictions based on traditional Forming Limit Diagrams are not relevant when the strain distribution is heterogonous over the thickness, as is the case for bent sheet metals. The aim of the present contribution is to propose an extension of the well-known Marciniak‒Kuczynski approach to account for the effect of bending on formability prediction. The new developed tool allows predicting the limit strains for the whole range of strain paths. The mechanical behavior of the studied sheets follows the rigid–plastic flow theory. Through numerical results, it is shown that bending tends to decrease the formability limit of the sheet metal.},
	issn = {1292-7775},
	edition = {Post-print},
	title = {Prediction of Forming Limit Diagrams under combined Bending-Stretching loadings},
	publisher = {EDP Sciences (K. Saanouni)},
	url = {10.1051/matecconf/20168003003}
}

@CONFERENCE{10985-10113,
	address = {France},
	pages = {4 p.},
	booktitle = {Actes du 12ème Colloque National en Calcul des Structures},
	year = {2015},
	author = {PEERLINGS, Ron and GEERS, Marc and ABED-MERAIM, Farid },
	abstract = {Cette contribution porte sur la prédiction de la striction diffuse dans le contexte des tôles métalliques sous changements biaxiaux. A cette fin, deux approches sont considérées, à savoir la théorie de bifurcation et le principe de force maximum, avec une analyse critique et une comparaison systématique de leurs prédictions respectives. L’expression bien connue du critère de striction diffuse de Swift, dont l’origine est attribuée au principe de force maximum, est montrée ici découler de l’approche de bifurcation, ce qui permet de lui donner une justification et des fondements plus solides.},
	edition = {Post-print},
	title = {Analyse de bifurcation et critères de force maximum dans la prédiction des limites de striction des tôles métalliques étirées},
	url = {http://hdl.handle.net/10985/10113}
}

@ARTICLE{10985-10021,
	journal = {Key Engineering Materials},
	volume = {554-557},
	pages = {1164-1173},
	year = {2013},
	author = {PIPARD, Jean-Marc and LEMOINE, Xavier and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {A physically based elasto-visco-plastic constitutive model is presented and compared to experimental results for a DD14 mild steel. The model requires significantly fewer material parameters compared to other visco-plasticity models from the literature while exhibiting very good accuracy. Accordingly, the parameter identification is simple and intuitive, requiring a relatively small set of experiments. The strain-rate sensitivity modeling is not restricted to a particular hardening law and thus provides a general framework in which advanced hardening equations can be adopted and compared. The model has been implemented in the commercial finite element code Abaqus/Explicit. First predictions compared to experiments are analyzed and underline the effect of hardening law and strain-rate sensitivity on 3D finite element simulations. The model has been also applied as the basis for a homogenization approach at the phase scale; preliminary investigations showed the benefits of coupling such an approach with scale-transition technique where microstructure-relevant data can explicitly enter the model and may be used for material design simulations.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Physically-motivated elasto-visco-plastic model for the large strain-rate behavior of steels},
	number = {The Current State-of-the-Art on Material Forming},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.554-557.1164}
}

@ARTICLE{10985-9910,
	journal = {Mechanics Research Communications},
	volume = {54},
	pages = {21– 26},
	year = {2013},
	author = {CAZACU, Oana and BALAN, Tudor},
	abstract = {Modeling of ductile damage is generally done using analytical potentials, which are expressed in the stress space. In this paper, for the first time it is shown that strain rate potentials which are exact conjugate of the stress-based potentials can be instead used to model the dilatational response of porous polycrystals. A new integration algorithm is also developed. It is to be noted that a strain-rate based formulation is most appropriate when the plastic flow of the matrix is described by a criterion that involves dependence on all stress invariants. In such cases, although a strain-rate potential is known, the stress-based potential cannot be obtained explicitly. While the proposed framework based on strain-rate potentials is general, for comparison purposes in this work we present an illustration of the approach for the case of a porous solid with von Mises matrix containing randomly distributed spherical cavities. Comparison between simulations using the strain-rate based approach and the classical stress-based Gurson’s criterion in uniaxial tension is presented. These results show that the model based on a strain-rate potential predicts the dilatational response with the same level of accuracy.},
	issn = {0093-6413},
	edition = {Post-print},
	title = {Elastic-plastic ductile damage model based on strain-rate plastic potential},
	publisher = {Elsevier},
	url = {10.1016/j.mechrescom.2013.09.006}
}

@CONFERENCE{10985-10014,
	address = {Espagne},
	pages = {10p.},
	booktitle = {COMPLAS’XI},
	year = {2011},
	author = {MANSOURI, Lotfi and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {The strain localization phenomenon that may occur during sheet metal forming represents a major cause of defective parts produced in the industry. Several instability criteria have been developed in the literature to predict the occurrence of these instabilities. The proposed work aims to couple a Gurson-type model to the Rice’s localization criterion. The implementation of the modeling is achieved via a user subroutine (Umat) in Abaqus/std using a Runge-Kutta explicit integration scheme. Finally, we show the effectiveness of the proposed coupling for the prediction of the formability of stretched metal sheets.},
	edition = {Post-print},
	title = {Prediction of strain localization during sheet metal forming using bifurcation analysis and Gurson-type damage},
	publisher = {E. Oñate, D.R.J. Owen, D. Peric and B. Suárez},
	url = {http://hdl.handle.net/10985/10014}
}

@CONFERENCE{10985-20355,
	address = {Maroc},
	pages = {3 p.},
	booktitle = {Actes du 13ème Congrès de Mécanique},
	year = {2017},
	author = {BOUVIER, Salima and CARVALHO-RESENDE, Tales and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {The aim of this work is to develop a dislocation density based model for IF and DP steels that incorporates details of the microstructure evolution at the grain-size scale. The model takes into account (i) the contribution of the chemical composition for the prediction of the initial yield stress, (ii) the description of initial texture anisotropy by incorporating grain-size dependent anisotropy coefficients in Hill’48 yield criterion, (iii) the contribution of three dislocation density “families” that are associated with forward, reverse and latent structures. It reproduces the macroscopic transient behaviors observed when strain-path changes occur. The model is implemented in FE code in order to assess its predictive capabilities in case of industrial applications.},
	edition = {Post-print},
	title = {Modelling the effect of microstructure evolution on the macroscopic behavior of single phase and dual phase steels. Application to sheet forming process},
	url = {http://hdl.handle.net/10985/20355}
}

@ARTICLE{10985-8936,
	journal = {Journal of Mechanical Science and Technology},
	volume = {25},
	pages = {1105-1117},
	year = {2011},
	author = {KILLPACK, Marc and ABED-MERAIM, Farid },
	abstract = {In this paper, the recently-developed solid-shell element SHB8PS is used for the analysis of a representative set of popular limit-point buckling benchmark problems. For this purpose, the element has been implemented in Abaqus/Standard finite element software and the modified Riks method was employed as an efficient path-following strategy. For the. benchmark problems tested, the new element shows better performance compared to solid elements and often performs as well as state-of-the-art shell elements. In contrast to shell elements, it allows for the accurate prescription of boundary conditions as applied to the actual edges of the structure.},
	issn = {1738-494X},
	edition = {Post-print},
	title = {Limit-point buckling analyses using solid, shell and solid–shell elements},
	number = {5},
	publisher = {Springer},
	url = {10.1007/s12206-011-0305-3}
}

@ARTICLE{10985-10008,
	journal = {Materials},
	volume = {6},
	pages = {5217-5233},
	year = {2013},
	author = {FRANZ, Gérald and BERVEILLER, Marcel and ABED-MERAIM, Farid },
	abstract = {An advanced elastic-plastic self-consistent polycrystalline model, accounting for intragranular microstructure development and evolution, is coupled with a bifurcation-based localization criterion and applied to the numerical investigation of the impact of microstructural patterns on ductility of single-phase steels. The proposed multiscale model, taking into account essential microstructural aspects, such as initial and induced textures, dislocation densities, and softening mechanisms, allows us to emphasize the relationship between intragranular microstructure of B.C.C. steels and their ductility. A qualitative study in terms of forming limit diagrams for various dislocation networks, during monotonic loading tests, is conducted in order to analyze the impact of intragranular substructure parameters on the formability of single-phase B.C.C. steels.},
	issn = {1996-1944},
	edition = {Post-print},
	title = {Impact of intragranular substructure parameters on the forming limit diagrams of single-phase B.C.C. steels},
	number = {11},
	publisher = {MDPI},
	url = {10.3390/ma6115217}
}

@CONFERENCE{10985-20346,
	address = {France},
	booktitle = {13ème colloque national en calcul des structures (CSMA)},
	year = {2017},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {Dans ce travail, les limites de ductilité associées à l’apparition d’une localisation des déformations sont prédites en utilisant le modèle d’endommagement de Gurson couplé à la théorie de bifurcation. Une étude paramétrique est effectuée, par rapport aux paramètres d’endommagement et d’écrouissage, afin d’identifier les paramètres matériaux les plus influents. L’analyse montre que les paramètres d’endommagement ont un impact significatif sur les limites de ductilité prédites, tandis que les effets d’écrouissage dépendent fortement du choix du mécanisme de germination des microcavités.},
	edition = {Post-print},
	title = {Prédiction de la localisation des déformations en utilisant un modèle d’endommagement à base micromécanique : effets des paramètres d’écrouissage et d’endommagement sur la formabilité},
	url = {http://hdl.handle.net/10985/20346}
}

@ARTICLE{10985-11858,
	journal = {Key Engineering Materials},
	volume = {716},
	pages = {779-789},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In the present work, a powerful modeling tool is developed to predict and analyze the onset of strain localization in polycrystalline aggregates. The predictions of localized necking are based on two plastic instability criteria, namely the bifurcation theory and the initial imperfection approach. In this tool, a micromechanical model, based on the self-consistent scale-transition scheme, is used to accurately derive the mechanical behavior of polycrystalline aggregates from that of their microscopic constituents (the single crystals). The mechanical behavior of the single crystals is developed within a large strain rate-independent constitutive framework. This micromechanical constitutive modeling takes into account the essential microstructure-related features that are relevant at the microscale. These microstructural aspects include key physical mechanisms, such as initial and induced crystallographic textures, morphological anisotropy and interactions between the grains and their surrounding medium. The developed tool is used to predict sheet metal formability through the concept of forming limit diagrams (FLDs). The results obtained by the self-consistent averaging scheme, in terms of predicted FLDs, are compared with those given by the more classical full-constraint Taylor model. Moreover, the predictions obtained by the imperfection approach are systematically compared with those given by the bifurcation analysis, and it is demonstrated that the former tend to the latter in the limit of a vanishing size for the initial imperfection.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Prediction of Localized Necking Based on Crystal Plasticity: Comparison of Bifurcation and Imperfection Approaches},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.716.779}
}

@CONFERENCE{10985-20340,
	address = {Espagne},
	isbn = {978-84-946909-6-9},
	pages = {174-183},
	booktitle = {XIV International Conference on Computational Plasticity. Fundamentals and Applications (COMPLAS)},
	year = {2017},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this work, ductility limits of metallic materials, associated with the occurrence of strain localization, are predicted using the GTN damage model coupled with bifurcation theory. The resulting approach is implemented into the finite element code ABAQUS within the framework of large plastic strains and a fully three-dimensional formulation. A parametric study with respect to damage and hardening parameters is conducted in order to identify the most influential material parameters on strain localization. The analysis shows that the damage parameters have a significant impact on the predicted ductility limits, while the effect of hardening parameters on strain localization depends on the choice of void nucleation mechanism.},
	edition = {Post-print},
	title = {Hardening effects on formability limit prediction based on Gurson-type damage models and bifurcation analysis},
	publisher = {CIMNE},
	url = {http://hdl.handle.net/10985/20340}
}

@ARTICLE{10985-10396,
	journal = {International Journal of Advanced Manufacturing Technology},
	volume = {71},
	pages = {1247-1262},
	year = {2014},
	author = {ALTMEYER, Guillaume and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {The prediction of forming limit diagrams (FLDs) is of significant interest to the sheet metal forming industry. Although a large variety of plastic instability criteria have been developed during the previous decades, there is still a lack of comparison of their respective theoretical bases. The aim of this paper is to present the theoretical formulations of a representative selection of diffuse necking and strain localization criteria based on the maximum force principle, the Marciniak-Kuczyński method and the bifurcation approach. The theoretical foundations and underlying assumptions for each criterion are specified prior to their application to several materials to determine the associated FLDs. The capability of the criteria to predict the formability of thin metal sheets is discussed and a classification of some of the criteria is attempted according to their order of occurrence in terms of the localization prediction.},
	issn = {0268-3768},
	edition = {Post-print},
	title = {Investigation and comparative analysis of plastic instability criteria: Application to forming limit diagrams},
	number = {5-8},
	publisher = {Springer Verlag},
	url = {10.1007/s00170-013-5530-8}
}

@ARTICLE{10985-9906,
	journal = {International Journal of Solids and Structures},
	volume = {50},
	pages = {2691–2700},
	year = {2013},
	author = {PIPARD, Jean-Marc and LEMOINE, Xavier and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {A physically based elasto-visco-plastic constitutive model is presented and compared to experimental results for three different mild steels. The experiments consist of tensile tests ranging from quasi-static conditions up to strain rates of 103 s-1 as well as quasi-static simple and reverse shear tests at different amounts of pre-strain. Additional two-step sequential mechanical tests (Bauschinger and orthogonal effects) have been performed to further evaluate the ability of the model to describe strain-path changes at moderate/large strains. The model requires significantly fewer material parameters compared to other visco-plasticity models from the literature, while being able to describe some of the main features of the strain-rate sensitivity of mild steels. Accordingly, the parameter identification is simple and intuitive, requiring a relatively small set of experiments. The strain-rate sensitivity modeling is not restricted to a particular hardening law and thus provides a general framework in which advanced hardening equations can be adopted.},
	issn = {0020-7683},
	edition = {Post-print},
	title = {Elasto-visco-plastic modeling of mild steels for sheet forming applications over a large range of strain rates},
	number = {16-17},
	publisher = {Elsevier},
	url = {10.1016/j.ijsolstr.2013.04.022}
}

@CONFERENCE{10985-10338,
	address = {Espagne},
	isbn = {978-84-89925-73-1},
	pages = {1369-1379},
	booktitle = {Proceedings of the 11th International Conference on Computational Plasticity XI: Fundamentals and application},
	year = {2011},
	author = {SALAHOUELHADJ, Abdellah and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {In this contribution, the formulation of the SHB8PS continuum shell finite element is extended to anisotropic elastic-plastic behavior models with combined isotropic-kinematic hardening at large deformations. The resulting element is then implemented into the commercial implicit finite element code Abaqus/Standard via the UEL subroutine. The SHB8PS element is an eight-node, three-dimensional brick with displacements as the only degrees of freedom and a preferential direction called the thickness. A reduced integration scheme is adopted using an arbitrary number of integration points along the thickness direction and only one integration point in the other directions. The hourglass modes due to this reduced integration are controlled using a physical stabilization technique together with an assumed strain method for the elimination of locking. Therefore, the element can be used to model thin structures while providing an accurate description of the various throughthickness phenomena. Its performance is assessed through several applications involving different types of non-linearities: geometric, material and that induced by contact. Particular attention is given to springback prediction for a Numisheet benchmark problem.},
	edition = {Post-print},
	title = {Elastic-plastic analyses using the solid-shell finite element SHB8PS and evaluation on sheet forming applications},
	publisher = {Onate, E; Owen, DRJ; Peric, D; Suarez, B},
	url = {http://hdl.handle.net/10985/10338}
}

@CONFERENCE{10985-10375,
	address = {France},
	pages = {6 p.},
	booktitle = {Actes du 20ème Congrès Français de Mécanique},
	year = {2011},
	author = {MANSOURI, Lotfi and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {Le phénomène de localisation des déformations plastiques, qui apparait lors d’opérations de mise en forme des tôles, représente l’une des principales causes de rebut des pièces produites dans l’industrie. Plusieurs critères d’instabilités ont été développés dans la littérature afin de prédire le moment d’apparition de ce phénomène. Le travail proposé ici consiste à coupler un modèle d’endommagement de type Gurson au critère de localisation de Rice. L’implantation est réalisée sous forme d’une routine utilisateur (UMAT) dans Abaqus/std via un schéma d’intégration explicite de type Runge-Kutta. Enfin, l’efficacité de la modélisation utilisée, pour la prédire les limites de formage des tôles est explorée.},
	edition = {Post-print},
	title = {Prédiction de la localisation par une approche d’endommagement micromécanique couplée à une analyse de bifurcation : application à la mise en forme des tôles},
	publisher = {Association Française de Mécanique},
	url = {http://hdl.handle.net/10985/10375}
}

@CONFERENCE{10985-10439,
	address = {France},
	year = {2010},
	author = {ALTMEYER, Guillaume and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {The originality of the approach used here is to present stability conditions of metallic materials modeled by general phenomenological laws and to apply them to the study of the formability of thin metallic sheets. The constitutive equations are based on an elastic-viscoplastic model coupled with a classical isotropic damage model. Various classical isotropic and kinematic hardening models are considered here to reproduce the hardening behavior and the induced anisotropy, while the initial anisotropy of metallic rolled sheets is introduced by Hill’48 anisotropic yield function. Softening is taken into account by coupling the constitutive model with a scalar damage variable. This phenomenological variable is defined within the framework of continuum damage mechanics and represents the degradation of the elastic properties during the forming operations. The stability of the constitutive damageable elastic-viscoplastic system is then sought by means of linear perturbation approach. Application of this method to a mild steel and a dual phase steel leads to the determination of their formability limit diagrams. On the one hand, FLDs obtained with Rice’s criterion and with this stability criterion illustrate the theoretical relation between these criteria and on the other hand, a parametric study shows the influence of governing parameters of hardening, damage and strain rate sensitivity.},
	edition = {Post-print},
	title = {Formability prediction of damageable elastic-viscoplastic media by a material stability analysis based on a linear perturbation method},
	url = {http://hdl.handle.net/10985/10439}
}

@ARTICLE{10985-10007,
	journal = {Key Engineering Materials},
	volume = {504-506},
	pages = {6},
	year = {2012},
	author = {RACZ, Sever-Gabriel and CHALAL, Hocine and BALAN, Tudor},
	abstract = {In this paper, we investigate the springback behavior of several advanced high-strength sheet steels (TRIP, Dual-Phase, ferrite-bainite) with thicknesses up to 4 mm. Samples were tested by means of the bending-under-tension (BUT) test. The BUT has been extensively applied, in the literature, to relatively thin (1 mm and thinner) sheet metals for automotive applications; the applicability of several guidelines from the literature was investigated in this work in the context of thick advanced high strength steel (AHSS) sheets and using a sample width of 12 mm. The monotonic decrease of springback as back force increased was confirmed for this category of sheet steels, and a general trend for the non-linear influence of the tool radius was observed. With the selected sample width, the effect of the secondary curvature was negligible. Conclusions and simple guidelines are drawn from the analysis with industrial sheet forming applications in mind.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Investigation of thick sheet AHSS springback in combined bending under tension},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.504-506.791}
}

@ARTICLE{10985-9909,
	journal = {Modelling and Simulation in Materials Science and Engineering},
	volume = {21},
	pages = {28p.},
	year = {2013},
	author = {CARVALHO RESENDE, Tales and BOUVIER, Salima and SABLIN, Simon-Serge and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {This paper investigates a recently developed elasto-plastic constitutive model. For this purpose, the model was implemented in a commercial finite element code and was used to simulate the cross-die deep drawing test. Deep drawing experiments and numerical simulations were conducted for five interstitial-free steels and seven dual-phase steels, each of them having a different thickness and strength. The main interest of the adopted model is a very efficient parameter identification procedure, due to the physical background of the model and the physical significance of some of its parameters and state variables. Indeed, the dislocation density, grain size, and martensite volume fraction explicitly enter the model’s formulation, although the overall approach is macroscopic. For the dual-phase steels, only the chemical composition and the average grain sizes were measured for the martensite and ferrite grains, as well as the martensite volume fraction. The mild steels required three additional tensile tests along three directions, in order to describe the plastic anisotropy. Information concerning the transient mechanical behavior after strain-path changes (reverse and orthogonal) was not collected for each material, but for only one material of each family of steels (IF, DP), based on previous works available in the literature. This minimalistic experimental base was used to feed the numerical simulations for the twelve materials that were confronted to deep drawing experiments in terms of thickness distributions. The results suggested that the accuracy of the numerical simulations is very satisfactory in spite of the scarce experimental input data. Additional investigations indicated that the modeling of the transient behavior due to strain-path changes may have a significant impact on the simulation results, and that the adopted approach provides a simple and efficient alternative in this regard.},
	issn = {0965-0393},
	edition = {Post-print},
	title = {Numerical investigation and experimental validation of a plasticity model for sheet steel forming},
	number = {1},
	publisher = {IOP Publishing},
	url = {10.1088/0965-0393/21/1/015008}
}

@ARTICLE{10985-10654,
	journal = {International Journal for Numerical Methods in Engineering},
	pages = {97},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In an incremental formulation suitable to numerical implementation, the use of rate-independent theory of crystal plasticity essentially leads to four fundamental problems. The first is to determine the set of potentially active slip systems over a time increment. The second is to select the active slip systems among the potentially active ones. The third is to compute the slip rates (or the slip increments) for the active slip systems. And the last problem is the possible non-uniqueness of slip rates. The purpose of this paper is to propose satisfactory responses to the above-mentioned first three issues by presenting and comparing two novel numerical algorithms. The first algorithm is based on the usual return-mapping integration scheme, while the second follows the so-called ultimate scheme. The latter is shown to be more relevant and efficient than the former. These comparative performances are illustrated through various numerical simulations of the mechanical behavior of single crystals and polycrystalline aggregates subjected to monotonic and complex loadings. Although these algorithms are applied in this paper to Body-Centered-Cubic (BCC) crystal structures, they are quite general and suitable for integrating the constitutive equations for other crystal structures (e.g., FCC and HCP).},
	issn = {0029-5981},
	edition = {Post-print},
	title = {Numerical integration of rate-independent BCC single crystal plasticity models: comparative study of two classes of numerical algorithms},
	publisher = {Wiley},
	url = {10.1002/nme.5215}
}

@ARTICLE{10985-10336,
	isbn = {978-303835106-1},
	journal = {Key Engineering Materials},
	volume = {611-612},
	pages = {545-552},
	year = {2014},
	author = {SOHO, Komi and LEMOINE, Xavier and ZAHROUNI, Hamid and ABED-MERAIM, Farid },
	abstract = {For the numerical simulation of sheet metal forming processes, the commercial finite element software packages are among the most commonly used. However, these software packages have some limitations; in particular, they essentially contain phenomenological constitutive models and thus do not allow accounting for the physical mechanisms of plasticity that take place at finer scales as well as the associated microstructure evolution. In this context, we propose to couple the Abaqus finite element code with micromechanical simulations based on crystal plasticity and a selfconsistent scale-transition scheme. This coupling strategy will be applied to the simulation of rolling processes, at different reduction rates, in order to estimate the evolution of the mechanical properties. By following some appropriately selected strain paths (i.e., strain lines) along the rolling process, one can also predict the texture evolution of the material as well as other parameters related to its microstructure. Our numerical results are compared with experimental data in the case of ferritic steels produced by ArcelorMittal.},
	issn = {1013-9826},
	edition = {Post-print},
	title = {Multiscale finite element simulation of forming processes based on crystal plasticity},
	publisher = {Trans Tech Publications},
	url = {10.4028/www.scientific.net/KEM.611-612.545}
}

@ARTICLE{10985-9893,
	journal = {International Journal of Plasticity},
	volume = {47},
	pages = {29-48},
	year = {2013},
	author = {CARVALHO RESENDE, Tales and BOUVIER, Salima and SABLIN, Simon-Serge and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {Sheet metal forming processes involve multi-axial strain paths. For the numerical simulation of such processes, an appropriate constitutive model that properly describes material behavior at large strain is required. For accurate and time-effective simulations, it is crucial to use plasticity models based on physics, as material macroscopic behavior is closely related to the evolution of the associated microstructures. Accordingly, a large strain work-hardening phenomenological model that incorporates the intragranular microstructure evolution through a dislocation density approach is proposed. The model is defined by a yield criterion and hardening laws that are all grain-size dependent. The classical Hill criterion in which grain-size dependency was introduced is proposed. Hardening laws are given by a combination of kinematic and isotropic contributions that respectively take into account the evolution with strain of cell blocks formed by geometrically necessary boundaries (GNBs) and individual dislocation cells delineated by incidental dislocation boundaries within cell blocks (IDBs). On the one hand, IDBs evolution contribution is described by a modified Rauch et al. isotropic model, which is able to describe work-hardening stagnation and work-softening. On the other hand, GNBs evolution contribution is described by a grain-size dependent tensorial back-stress expression proposed by Aouafi et al. [2007] to describe the plastic anisotropy and Bauschinger effect. Moreover, the proposed model aims to accurately predict steel behavior through an innovative approach by only changing few “simply measurable” microstructure data (e.g. chemical composition, grain size…). The predictive capabilities of the model are assessed for interstitial free (IF) and dual phase (DP) steels with grain sizes varying respectively in the 8-40 µm and 1-10 µm value range. Different loading paths are analyzed, namely the uniaxial tensile test, reversal simple shear and orthogonal tests.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Dislocation-based model for the prediction of the behavior of b.c.c. materials – grain size and strain path effects},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2013.01.003}
}

@ARTICLE{10985-10196,
	isbn = {978-073540800-5},
	journal = {American Institute of Physics Conf. Proc},
	volume = {1252},
	pages = {1339-1346},
	year = {2010},
	author = {CARVALHO RESENDE, Tales and BOUVIER, Salima and SABLIN, Simon-Serge and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {With a view to environmental, economic and safety concerns, car manufacturers need to design lighter and safer vehicles in ever shorter development times. In recent years, High Strength Steels (HSS) like Interstitial Free (IF) steels which have higher ratios of yield strength to elastic modulus, are increasingly used for sheet metal parts in automotive industry to meet the demands. Moreover, the application of sheet metal forming simulations has proven to be beneficial to reduce tool costs in the design stage and to optimize current processes. The Finite Element Method (FEM) is quite successful to simulate metal forming processes but accuracy largely depends on the quality of the material properties provided as input to the material model. Common phenomenological models roughly consist in the fitting of functions on experimental results and do not provide any predictive character for different metals from the same grade. Therefore, the use of accurate plasticity models based on physics would increase predictive capability, reduce parameter identification cost and allow for robust and time-effective finite element simulations. For this purpose, a 3D physically based model at large strain with dislocation density evolution approach was presented in IDDRG2009 by the authors [1]. This model allows the description of work-hardening's behavior for different loading paths (i.e. uni-axial tensile, simple shear and Bauschinger tests) taking into account several data from microstructure (i.e. grain size, texture, etc...). The originality of this model consists in the introduction of microstructure data in a classical phenomenological model in order to achieve work-hardening's predictive character for different metals from the same grade. Indeed, thanks to a microstructure parameter set for an Interstitial Free steel, it is possible to describe work-hardening behavior for different loading paths of other IF steels by only changing the mean grain size and the chemical composition. During sheet metal forming processes local material points may experience multi-axial and multi-path loadings. Before simulating actual industrial parts, automotive manufacturers use validation tools - e.g. the Cross-Die stamping test. Such typical stamping tests enable the evaluation of a complex distribution of strains. The work described is an implementation [2] of a 3D dislocation based model in ABAQUS/Explicit and its validation on a Finite Element (FE) Cross-Die model. In order to assess the performance and relevance of the 3D dislocation based model in the simulation of industrial forming applications, the results of thinning profiles predicted along several directions and the strain distribution were obtained and compared with experimental results for IF steels with grain sizes varying in the 8-22 μm value range.},
	edition = {Post-print},
	title = {Application of a dislocation based model for Interstitial Free (IF) steels to typical stamping simulations},
	url = {10.1063/1.3457539}
}

@ARTICLE{10985-11915,
	journal = {Latin American Journal of Solids and Structures},
	volume = {14},
	pages = {1-21},
	year = {2017},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The prediction of plastic instability in sheet metals during forming processes represents nowadays an ambitious challenge. To reach this goal, a new numerical approach, based on the loss of ellipticity criterion, is proposed in the present contribution. A polycrystalline model is implemented as a user-material subroutine into the ABAQUS/Implicit finite element (FE) code. The polycrystalline constitutive model is assigned to each integration point of the FE mesh. To derive the mechanical behavior of this polycrystalline aggregate from the behavior of its microscopic constituents, the multiscale self-consistent scheme is used. The mechanical behavior of the single crystals is described by a finite strain rateindependent constitutive framework, where the Schmid law is used to model the plastic flow. The condition of loss of ellipticity at the macroscale is used as plastic instability criterion in the FE modeling. This numerical approach, which couples the FE method with the self-consistent scheme, is used to simulate a deep drawing process, and the above criterion is used to predict the formability limit of the studied sheets during this operation.},
	issn = {1679-7817},
	edition = {Post-print},
	title = {Prediction of Plastic Instability in Sheet Metals During Forming Processes Using the Loss of Ellipticity Approach},
	publisher = {Argentinean Association of Computational Mechanics, Brazilian Association of Computational Mechanics, Mexican Association of Numerical Methods in Engineering and Applied Sciences},
	url = {10.1590/1679-78253544}
}

@CONFERENCE{10985-20347,
	address = {Maroc},
	booktitle = {Proceedings of the International Symposium on Aircraft Materials},
	year = {2016},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {In this work, ductility limits of metallic materials, associated with the occurrence of strain localization, are predicted using the GTN damage model coupled with bifurcation theory. The resulting approach is implemented into the finite element code ABAQUS within the framework of large plastic strains and a fully three-dimensional formulation. A parametric study with respect to damage and hardening parameters is conducted in order to identify the most influential material parameters on strain localization. The analysis shows that the damage parameters have a significant impact on the predicted ductility limits, while the effect of hardening parameters on strain localization depends on the choice of void nucleation mechanism.},
	edition = {Post-print},
	title = {Prediction of strain localization using a micromechanics-based damage model: impact of damage and hardening parameters on formability},
	publisher = {ACMA},
	url = {http://hdl.handle.net/10985/20347}
}

@CONFERENCE{10985-18917,
	address = {France},
	isbn = {978-0-7354-1427-3},
	volume = {1769},
	pages = {7p.},
	booktitle = {Proceedings of the 19th International ESAFORM Conference on Material Forming},
	year = {2016},
	author = {MSOLLI, Sabeur and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In the present paper, Thomason’s criterion is coupled with the well-known Gurson–Tvergaard–Needleman (GTN) damage model and used for the determination of the critical void volume fraction fc , which marks the initiation of the coalescence stage. The onset of void coalescence predicted by Thomason’s criterion is compared to that obtained by using a predefined fc , which is usually fitted on the basis of experimental results, as originally proposed in the GTN model. Comparisons are made in terms of both single finite element simulations and numerical results of deep drawing of a cup.},
	edition = {Post-print},
	title = {Modeling of void coalescence initiation and its impact on the prediction of material failure},
	number = {160006},
	publisher = {Francisco Chinesta, Elias Cueto and Emmanuelle Abisset-Chavanne (AIP)},
	url = {10.1063/1.4963549}
}

@ARTICLE{10985-10198,
	journal = {Structural Engineering and Mechanics},
	volume = {37},
	pages = {253-256},
	year = {2011},
	author = {COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {The formulation of a six-node solid-shell called SHB6, which is a linear, isoparametric element, is discussed. An eigenvalue analysis of the element stiffness matrix is first carried out. Several modifications are introduced into the formulation of the SHB6 element following the assumed strain method adopted by Belytschko and Bindeman. SHB6's coordinates and displacements are related to the nodal coordinates and displacements through the linear shape functions. Applying the simplified form of the Hu-Washizu nonlinear mixed variational principle, in which the assumed stress field is chosen to be orthogonal to the difference between the symmetric part of the displacement gradient and the assumed strain field, the formula is obtained. The newly developed SHB6 element was implemented into the finite element codes INCA and ASTER. It represents some improvement since it converges well and performs much better than the PRI6 six-node three-dimensional element in all of the benchmark problems tested.},
	issn = {1225-4568},
	edition = {Post-print},
	title = {New prismatic solid-shell element : Assumed strain formulation and hourglass mode analysis},
	number = {2},
	publisher = {Techno-press Ltd},
	url = {http://hdl.handle.net/10985/10198}
}

@ARTICLE{10985-10193,
	journal = {Journal of Mechanical Science and Technology},
	volume = {25},
	pages = {2345-2364},
	year = {2011},
	author = {TRINH, Vuong-Dieu and COMBESCURE, Alain and ABED-MERAIM, Farid },
	abstract = {This paper presents the development of a new prismatic solid-shell finite element, denoted SHB6, obtained using a purely three-dimensional approach. This element has six nodes with displacements as the only degrees of freedom, and only requires two integration points distributed along a preferential direction, designated as the "thickness". Although geometrically three-dimensional, this element can be conveniently used to model thin structures while taking into account the various phenomena occurring across the thickness. A reduced integration scheme and specific projections of the strains are introduced, based on the assumed-strain method, in order to improve performance and to eliminate most locking effects. It is first shown that the adopted in-plane reduced integration does not generate "hourglass" modes, but the resulting SHB6 element exhibits some shear and thickness-type locking. This is common in linear triangular elements, in which the strain is constant. The paper details the formulation of this element and illustrates its capabilities through a set of various benchmark problems commonly used in the literature. In particular, it is shown that this new element plays a useful role as a complement to the SHB8PS hexahedral element, which enables one to mesh arbitrary geometries. Examples using both SHB6 and SHB8PS elements demonstrate the advantage of mixing these two solid-shell elements.},
	issn = {1738-494X},
	edition = {Post-print},
	title = {A new assumed strain solid-shell formulation "SHB6" for the six-node prismatic finite element},
	number = {9},
	publisher = {Springer},
	url = {10.1007/s12206-011-0710-7}
}

@CONFERENCE{10985-19095,
	address = {Belgique},
	pages = {3p.},
	booktitle = {International conference on COmputational methods in Manufacturing Processes},
	year = {2016},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {The aim of this paper is to develop a new efficient integration scheme, able to integrate the constitutive equations for rate-independent theory of crystal plasticity at finite strain. This algorithm proposes an efficient method to determine the set of active slip systems and the corresponding slip rates. This method is based on the use of a smooth formulation of the Schmid law. The issue of nonuniqueness in the determination of slip rates can be overcome by using two different numerical techniques.},
	edition = {Post-print},
	title = {Development of a new algorithm for the time integration of rate-independent crystal plasticity models},
	url = {http://hdl.handle.net/10985/19095}
}

@ARTICLE{10985-9972,
	journal = {Mechanics of Materials},
	volume = {91},
	pages = {152-166},
	year = {2015},
	author = {CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {The localization of deformation into planar bands is often considered as the ultimate stage of strain prior to ductile fracture. In this study, ductility limits of metallic materials are predicted using the Gurson–Tvergaard–Needleman (GTN) damage model combined with the bifurcation approach. Both the GTN constitutive equations and the Rice bifurcation criterion are implemented into the finite element (FE) code ABAQUS/Standard within the framework of large plastic strains and a fully three-dimensional formulation. The current contribution focuses on the effect of strain hardening on ductility limit predictions. It is shown that the choice of void nucleation mechanism has an important influence on the sensitivity of the predicted ductility limits to strain hardening. When strain-controlled nucleation is considered, varying the hardening parameters of the fully dense matrix material has no effect on the porosity evolution and, consequently, very small impact on the predicted ductility limits. For stress-controlled nucleation, the porosity evolution is directly affected by the strain hardening characteristics, which induce a significant effect on the predicted ductility limits. This paper also discusses the use of a micromechanics-based calibration for the GTN q -parameters in the case of strain-controlled nucleation, which is also shown to allow accounting for the hardening effects on plastic strain localization.},
	issn = {0167-6636},
	edition = {Post-print},
	title = {Hardening effects on strain localization predictions in porous ductile materials using the bifurcation approach},
	number = {Part1},
	publisher = {Elsevier},
	url = {10.1016/j.mechmat.2015.07.012}
}

@ARTICLE{10985-10060,
	journal = {Steel Research International},
	volume = {85},
	pages = {980-987},
	year = {2014},
	author = {FRANZ, Gérald and BERVEILLER, Marcel and ABED-MERAIM, Farid },
	abstract = {The determination of forming limit strains in sheet metal forming industry is a useful way for quantifying metals in terms of formability. However, such forming limit diagrams (FLDs) remain very difficult to obtain experimentally. Therefore, the numerical prediction of forming limit strains represents a convenient alternative to replace this time consuming and expensive experimental process. Moreover, a combined theoretical-numerical model allows investigating the impact of essential microstructural aspects (e.g., initial and induced textures, dislocation density evolution, softening mechanisms, ...) and deformation mechanisms on the ductility of polycrystalline aggregates. In this paper, the impact of microstructural and morphological parameters, particularly the mean grain size, on the formability limit of BCC materials is investigated. To this end, an elastic-plastic self-consistent (EPSC) polycrystalline model, coupled with a bifurcation-based localization criterion, is adopted to numerically simulate FLDs. The FLDs thus determined using the Bifurcation-EPSC model for an IF-Ti single-phase steel are compared to the FLDs given by ArcelorMittal, demonstrating the predictive capability of the proposed approach in investigations of sheet metal formability. The role of the averaging scheme is also shown to be significant by comparing the critical limit strains predicted with the self-consistent scale-transition scheme to those obtained with the more classical full-constraint Taylor model. Finally, numerical simulations for different values of mean grain size are provided in order to analyze the impact of mean grain size on the formability of BCC metal sheets. In this study, an elastic-plastic self-consistent (EPSC) polycrystalline model is coupled with a bifurcation-based localization criterion to investigate relationships between microstructural and morphological properties and formability of single-phase BCC steels. The interest in such a combined theoretical-numerical prediction tool is to classify materials in terms of ductility and to optimize material properties or to design new grades of steel with enhanced in-use mechanical properties.},
	issn = {1611-3683},
	edition = {Post-print},
	title = {Effect of microstructural and morphological parameters on the formability of BCC metal sheets},
	number = {6},
	publisher = {Wiley},
	url = {10.1002/srin.201300166}
}

@CONFERENCE{10985-20339,
	address = {France},
	volume = {80},
	pages = {07001},
	booktitle = {NUMIFORM 2016: The 12th International Conference on Numerical Methods in Industrial Forming Processes},
	year = {2016},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {A family of prismatic and hexahedral solid‒shell (SHB) elements with their linear and quadratic versions is presented in this paper to model thin 3D structures. Based on reduced integration and special treatments to eliminate locking effects and to control spurious zero-energy modes, the SHB solid‒shell elements are capable of modeling most thin 3D structural problems with only a single element layer, while describing accurately the various through-thickness phenomena. In this paper, the SHB elements are combined with fully 3D behavior models, including orthotropic elastic behavior for composite materials and anisotropic plastic behavior for metallic materials, which allows describing the strain/stress state in the thickness direction, in contrast to traditional shell elements. All SHB elements are implemented into ABAQUS using both standard/quasi-static and explicit/dynamic solvers. Several benchmark tests have been conducted, in order to first assess the performance of the SHB elements in quasi-static and dynamic analyses. Then, deep drawing of a hemispherical cup is performed to demonstrate the capabilities of the SHB elements in handling various types of nonlinearities (large displacements and rotations, anisotropic plasticity, and contact). Compared to classical ABAQUS solid and shell elements, the results given by the SHB elements show good agreement with the reference solutions.},
	issn = {2261-236X},
	edition = {Post-print},
	title = {Simulation of nonlinear benchmarks and sheet metal forming processes using linear and quadratic solid–shell elements combined with advanced anisotropic behavior models},
	publisher = {EDP Sciences},
	url = {10.1051/matecconf/20168007001}
}

@CONFERENCE{10985-19658,
	address = {Pologne},
	isbn = {978-3-03835-704-9},
	pages = {779-790},
	booktitle = {Metal Forming 2016},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In the present work, a powerful modeling tool is developed to predict and analyze the onset of strain localization in polycrystalline aggregates. The predictions of localized necking are based on two plastic instability criteria, namely the bifurcation theory and the initial imperfection approach. In this tool, a micromechanical model, based on the self-consistent scale-transition scheme, is used to accurately derive the mechanical behavior of polycrystalline aggregates from that of their microscopic constituents (the single crystals). The mechanical behavior of the single crystals is developed within a large strain rate-independent constitutive framework. This micromechanical constitutive modeling takes into account the essential microstructure-related features that are relevant at the microscale. These microstructural aspects include key physical mechanisms, such as initial and induced crystallographic textures, morphological anisotropy and interactions between the grains and their surrounding medium. The developed tool is used to predict sheet metal formability through the concept of forming limit diagrams (FLDs). The results obtained by the self-consistent averaging scheme, in terms of predicted FLDs, are compared with those given by the more classical full-constraint Taylor model. Moreover, the predictions obtained by the imperfection approach are systematically compared with those given by the bifurcation analysis, and it is demonstrated that the former tend to the latter in the limit of a vanishing size for the initial imperfection.},
	edition = {Post-print},
	title = {Prediction of localized necking based on crystal plasticity: Comparison of bifurcation and imperfection approaches},
	publisher = {Trans Tech Publication},
	url = {http://hdl.handle.net/10985/19658}
}

@CONFERENCE{10985-10108,
	address = {France},
	pages = {3-9},
	booktitle = {Journées annuelles de la Société Française de Métallurgie et de Matériaux},
	year = {2011},
	author = {FRANZ, Gérald and BEN ZINEB, Tarak and LEMOINE, Xavier and BERVEILLER, Marcel and ABED-MERAIM, Farid },
	abstract = {In order to investigate the effects of microstructure and deformation mechanisms on the ductility of multiphase steels, a formability criterion based on loss of ellipticity of the boundary value problem is coupled with an advanced multiscale model accounting for intragranular microstructure development and evolution. The resulting large strain elastic–plastic single crystal constitutive law (based on crystal plasticity) is incorporated into a self-consistent scale-transition scheme. The present contribution focuses on the relationship between the intragranular microstructure of B.C.C. steels and their ductility. The model allows interesting comparisons in terms of formability limits for different dislocation networks, during monotonic loading tests applied to polycrystalline aggregates.},
	edition = {Post-print},
	title = {Impact of microstructural mechanisms on ductility limits},
	url = {http://hdl.handle.net/10985/10108}
}

@CONFERENCE{10985-20359,
	address = {France},
	isbn = {978-889-385-041-4},
	year = {2017},
	author = {TIAN, Haitao and POTIER-FERRY, Michel and ABED-MERAIM, Farid },
	abstract = {This paper introduces a new meshless method named Taylor Meshless Method (TMM) using Taylor series to deduce the shape functions. Next the problem is discretized by point-collocation only on the boundary and without integration. The discrete boundary problem is solved by least-squares method. In this talk, this method is applied to bending and buckling of isotropic and anisotropic plates. The shape functions are polynomials that coincide with harmonic polynomials in the case of Laplace equation. These polynomials are computed numerically by solving the PDE approximately in the sense of Taylor series. Of course, this leads to an error that decreases asymptotically with the degree. TMM can be considered as a Trefftz Method, but we search approximated solutions in the sense of Taylor series while Trefftz Method is generally based on exact solutions of the PDE. As a counterpart, one is able to build this complete family of approximated solutions, whatever be the studied equation. A strong reduction of the number of degrees of freedom is the main advantage of this class of discretization techniques. The main drawback is the ill-conditioning of the final matrix, what can limit the size of the solved problem, but it was established that TMM is able to solve large scale problems. In the case of nonlinear PDEs as Föppl-Von Karman plate models, one applies first a linearization technique as Newton iterative technique. Here we apply Asymptotic Numerical Method. Next the resulting linear equations have variable coefficients are they are solved by TMM. Several linear and nonlinear numerical results will be presented for isotropic and anisotropic laminated plates.},
	edition = {Post-print},
	title = {Taylor Meshless Method for bending and buckling of thin plates},
	publisher = {AJM Ferreira et al.},
	url = {10.15651/978-88-938-5041-4}
}

@ARTICLE{10985-10211,
	journal = {American Institute of Physics Conf. Proc},
	volume = {1353},
	pages = {1203-1208},
	year = {2011},
	author = {SALAHOUELHADJ, Abdellah and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {In this contribution, the formulation of the SHB8PS continuum shell finite element is extended to anisotropic elastic-plastic behavior models with combined isotropic-kinematic hardening at large deformations. The resulting element is then implemented into the commercial implicit finite element code Abaqus/Standard via the UEL subroutine. The SHB8PS element is an eight-node, three-dimensional brick with displacements as the only degrees of freedom and a preferential direction called the thickness. A reduced integration scheme is adopted using an arbitrary number of integration points along the thickness direction and only one integration point in the other directions. The hourglass modes due to this reduced integration are controlled using a physical stabilization technique together with an assumed strain method for the elimination of locking. Therefore, the element can be used to model thin structures while providing an accurate description of the various through-thickness phenomena. Its performance is assessed through several applications involving different types of non-linearities: geometric, material and that induced by contact. Particular attention is given to springback prediction for a NUMISHEET benchmark problem.},
	edition = {Post-print},
	title = {On the implementation of the continuum shell finite element SHB8PS and application to sheet forming simulation},
	url = {10.1063/1.3589680}
}

@CONFERENCE{10985-10457,
	address = {France},
	year = {2010},
	author = {CARVALHO RESENDE, Tales and SAADAOUI, Ayoub and BOUVIER, Salima and SABLIN, Simon-Serge and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {With a view to environmental, economic and safety concerns, car manufacturers need to design lighter and safer vehicles in ever-shorter development times. In recent years, High Strength Steels (HSS) like Interstitial Free (IF) steels, which have ratio of yield strength to elastic modulus, are increasingly used for sheet metal parts in automotive industry to reduce mass. The Finite Element Method (FEM) is quite successful to simulate metal forming processes but accuracy depends both on the constitutive laws used and their material parameters identification. Common phenomenological models roughly consist in the fitting of functions on experimental results and do not provide any predictive character for different metals from the same grade. Therefore, the use of accurate plasticity models based on physics would increase predictive capability, reduce parameter identification cost and allow for robust and time-effective finite element simulations. For this purpose, a 3D physically-based model at large strain with dislocation density evolution approach was presented in IDDRG2009 by the authors. This approach can be decomposed as a combination of isotropic and kinematic contributions. The model enables the description of work-hardening’s behaviour for different simple loading paths (i.e. uniaxial tensile, simple shear and Bauschinger tests) taking into account several data from microstructure (i.e. grain size, texture, etc.…). The originality of this model consists in the introduction of microstructure data in a classical phenomenological model in order to achieve work-hardening’s predictive character for different metals from the same grade. Indeed, thanks to a microstructure parameter set for IF steels, it is possible to describe work-hardening’s behaviour for different steels of grain sizes varying in the 8.5-22µm value range by only changing the mean grain size and initial yield stress values. Forming Limit Diagrams (FLDs) have been empirically constructed to describe the strain states at which a highly localized zone of thinning, or necking, becomes visible on the surface of sheet metals. FLDs can be experimentally obtained through Marciniak Stretch test, which is a modified dome test. It was designed to overcome the severe strain gradients developed by the traditional dome tests using a hemispherical punch (e.g. Nakajima test). Many automotive manufacturers use Marciniak Stretch test as a validation tool before simulating real parts. The work described is an implementation of a 3D dislocation based model in ABAQUS/Explicit together with its validation on a finite element (FE) Marciniak Stretch test. In order to assess the performance and relevance of the 3D dislocation based model in the simulation of industrial forming applications, FLDs will be plotted and compared to experimental results for different IF steels.},
	edition = {Post-print},
	title = {Application of a dislocation based model for Interstitial Free (IF) steels to Marciniak Stretch test simulations},
	url = {http://hdl.handle.net/10985/10457}
}

@ARTICLE{10985-14056,
	journal = {Journal of Physics: Conference Series},
	volume = {734},
	pages = {032069},
	year = {2016},
	author = {ADZIMA, Francis and MANACH, Pierre-Yves and TABOUROT, Laurent and TOUTAIN, Sébastien and DIOT, Jean-Luc and BALAN, Tudor},
	abstract = {Micro-forming of ultra-thin sheet metals raises numerous challenges. In this investigation, the predictions of state-of-the-art crystal plasticity (CP) and phenomenological models are compared in the framework of industrial bending-dominated forming processes. Sheet copper alloys 0.1mm-thick are considered, with more than 20 grains through the thickness. Consequently, both model approaches are valid on theoretical ground. The phenomenological models’ performance was conditioned by the experimental database used for parameter identification. The CP approach was more robust with respect to parameter identification, while allowing for a less flexible description of kinematic hardening, at the cost of finer mesh and specific grain-meshing strategies. The conditions for accurate springback predictions with CP-based models are investigated, in an attempt to bring these models at the robustness level required for industrial application.},
	issn = {1742-6588},
	edition = {Post-print},
	title = {Simulation of ultra-thin sheet metal forming using phenomenological and crystal plasticity models},
	publisher = {IOP Publishing},
	url = {10.1088/1742-6596/734/3/032069}
}

@CONFERENCE{10985-19922,
	address = {Australie},
	volume = {2},
	pages = {85-90},
	booktitle = {Materials Research Proceedings},
	year = {2016},
	author = {MAUDUIT, C. and KUBLER, Régis and PUYDT, Quentin and MONIN, Martine and WEBER, Bastien and BERVEILLER, Sophie and BARRALLIER, Laurent},
	abstract = {Shot-peening is a popular mechanical surface treatment used in automotive and aeronautical industries to enhance life duration of mechanical parts by introducing compressive residual stresses. TRIP 780 fatigue type specimens are shot-peened and loaded under cyclic bending. The martensite phase transformation and the evolution of residual stresses in the different phases are determined by XRD at different number of cycles. A FEM model is also proposed to better understand the evolution of residual stresses in the first cycles.},
	issn = {2474-395X},
	edition = {Post-print},
	title = {Analysis of Residual Stress Relaxation Under Mechanical Cyclic Loading of Shot-Peened TRIP780 Steel},
	publisher = {Materials Research Forum LLC},
	url = {10.21741/9781945291173-15}
}

@CONFERENCE{10985-11021,
	address = {Oman},
	isbn = {978-3-03835-220-4},
	year = {2015},
	author = {GU, Guochao and BECKER, Eric and PESCI, Raphaël and LANGLOIS, Laurent},
	abstract = {After analazing,the microstructure of the thixoforged parts, some mechanisms of material flow are proposed.},
	edition = {Post-print},
	title = {Deformation behavior and microstructure evolution of steel during the entire thixoforging process for improving the process controlling},
	publisher = {Trans Tech publications},
	url = {http://hdl.handle.net/10985/11021}
}

@CONFERENCE{10985-9720,
	address = {France},
	pages = {1},
	booktitle = {Journée de Printemps SF2M "Microstructure – procédés – propriétés en fatigue"},
	year = {2015},
	author = {MAUDUIT, Clément and KUBLER, Régis and PUYDT, Quentin and BERVEILLER, Sophie and BARRALLIER, Laurent},
	abstract = {Le grenaillage de précontrainte a pour but d’augmenter la durée de vie des matériaux traités en introduisant des contraintes résiduelles de compression. Cette étude porte sur la modélisation de la tenue en fatigue d’aciers grenaillés et plus particulièrement d’aciers à transformation austénite-martensite sous sollicitation. L’approche utilise la des éléments-finis. L’introduction des contraintes résiduelles est obtenue par dilatation thermique fictive. Cette méthode est utilisée pour générer un gradient de contraintes initial dans une éprouvette sollicitée en flexion pure et conçue pour les essais de fatigue. Un post-traitement en fatigue utilisant le critère de fatigue multiaxial de Crossland est présenté et appliqué à cette éprouvette de flexion.},
	edition = {Post-print},
	title = {Modélisation de la tenue en fatigue des aciers à transformation de phase austénite martensite après grenaillage de précontrainte},
	publisher = {MATEC Web of Conferences},
	url = {http://hdl.handle.net/10985/9720}
}

@ARTICLE{10985-17479,
	journal = {Strojniški vestnik = Journal of Mechanical Engineering},
	volume = {63},
	pages = {25-34},
	year = {2017},
	author = {WANG, Peng and CHALAL, Hocine and ABED-MERAIM, Farid },
	abstract = {A family of prismatic and hexahedral solid–shell (SHB) elements, with their linear and quadratic versions, is proposed in this work to model thin structures. The formulation of these SHB elements is extended to explicit dynamic analysis and large-strain anisotropic plasticity on the basis of a fully three-dimensional approach using an arbitrary number of integration points along the thickness direction. Several special treatments are applied to the SHB elements in order to avoid all locking phenomena and to guarantee the accuracy and efficiency of the simulations. These solid-shell elements have been implemented into ABAQUS standard/quasi-static and explicit/dynamic software packages. A number of static and dynamic benchmark problems, as well as a simulation of the deep drawing of a cylindrical cup, have been conducted to assess the performance of these SHB elements.},
	issn = {0039-2480},
	edition = {Pre-print},
	title = {Linear and Quadratic Solid-Shell Elements for Quasi-Static and Dynamic Simulations of Thin 3D Structures: Application to a Deep Drawing Process},
	number = {1},
	publisher = {Univerza v Ljubljani Fakulteta za strojništvo},
	url = {10.5545/sv-jme.2016.3526}
}

@ARTICLE{10985-8875,
	journal = {International Journal of Plasticity},
	volume = {48},
	pages = {1–33},
	year = {2013},
	author = {FRANZ, Gérald and BERVEILLER, Marcel and ABED-MERAIM, Farid },
	abstract = {In this paper, we performed a strain localization analysis for single crystals and polycrystals, with the specific aim of establishing a link between the microstructure-related parameters and ductility. To this end, advanced large-strain elastic plastic single crystal constitutive modeling is adopted, accounting for the key physical mechanisms that are relevant at the microscale, such as dislocation storage and annihilation. The self-consistent scale-transition scheme is then used to derive the overall constitutive response of polycrystalline aggregates, including the essential microstructural aspects (e.g., initial and induced textures, dislocation density evolution, and softening mechanisms). The resulting constitutive equations for single crystals and polycrystals are coupled with two strain localization criteria: bifurcation theory, which is also related to the loss of ellipticity in the associated boundary value problem, and the strong ellipticity condition, which is presented in full detail along with mathematical links allowing for hierarchical classification in terms of conservativeness. The application of the proposed coupling to single crystals and polycrystals allows the effect of physical microstructural parameters on material ductility to be investigated. Consistent results are found for both single crystals and polycrystals. In addition, forming limit diagrams (FLDs) are constructed for IF-Ti single-phase steels with comparison to the reference results, demonstrating the predictive capability of the proposed approach in investigations of sheet metal formability. The results of the self-consistent scheme are systematically compared to those of the more classical full-constraint Taylor model, both in terms of the impact of microstructural parameters on ductility and in terms of the predicted formability limits and the level of the associated limit strains. Finally, we investigated the impact of strain-path changes on formability through the analysis of the effect of prestrain on the FLDs.},
	issn = {0749-6419},
	edition = {Post-print},
	title = {Strain localization analysis for single crystals and polycrystals: Towards microstructure-ductility linkage},
	publisher = {Elsevier},
	url = {10.1016/j.ijplas.2013.02.001}
}

@ARTICLE{10985-11857,
	journal = {International Journal of Mechanical Sciences},
	volume = {130},
	pages = {244-257},
	year = {2017},
	author = {BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In modern sheet metal forming processes, such as hydroforming and single point incremental forming, sheet metals are often subjected to out-of-plane compressive stresses in addition to traditional in-plane stresses. However, the effect of these out-of-plane stresses on the onset of plastic strain localization is not considered when classic necking criteria are used, as the latter are generally formulated based on the plane stress assumption. The main objective of the present investigation is to overcome this limitation by developing numerical tools and analytical relations that allow considering the influence of these compressive stresses on the prediction of localized necking. In the different tools developed, and for comparison purposes, finite strain versions of both the deformation theory of plasticity and the rigid-plastic flow theory are used to describe the mechanical behavior of the metal sheet. Furthermore, both the bifurcation theory and the initial imperfection approach are employed to predict the onset of strain localization. Various numerical predictions are reported to illustrate the effect of normal stress on the occurrence of localized necking in sheet metals. From these different results, it is clearly demonstrated that out-of-plane stresses may notably enhance sheet metal formability and, therefore, this property can be effectively used to avoid the initiation of early strain localization.},
	issn = {0020-7403},
	edition = {Post-print},
	title = {Theoretical and numerical investigation of the impact of out-of-plane compressive stress on sheet metal formability},
	publisher = {Elsevier},
	url = {10.1016/j.ijmecsci.2017.05.046}
}

@CONFERENCE{10985-19115,
	address = {France},
	volume = {80},
	pages = {8},
	booktitle = {MATEC Web of Conference-Numiform2016},
	year = {2016},
	author = {AKPAMA, Holanyo K. and BEN BETTAIEB, Mohamed and ABED-MERAIM, Farid },
	abstract = {In this paper, both the bifurcation theory and the initial imperfection approach are used to predict localized necking in substrate-supported metal layers. The self-consistent scale-transition scheme is used to derive the mechanical behavior of a representative volume element of the metal layer from the behavior of its microscopic constituents (the single crystals). The mechanical behavior of the elastomer substrate follows the neo-Hookean hyperelastic model. The adherence between the two layers is assumed to be perfect. Through numerical results, it is shown that the limit strains predicted by the initial imperfection approach tend towards the bifurcation predictions when the size of the geometric imperfection in the metal layer vanishes. Also, it is shown that the addition of an elastomer layer to a metal layer enhances ductility.},
	issn = {2261-236X},
	edition = {Post-print},
	title = {Ductility prediction of substrate-supported metal layers based on rate-independent crystal plasticity theory},
	url = {10.1051/matecconf/20168002007}
}

@ARTICLE{10985-10339,
	journal = {Steel Research International},
	volume = {81},
	pages = {1364-1367},
	year = {2010},
	author = {ALTMEYER, Guillaume and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {Because prevention of forming defects has become one of the major industrial challenges, various experimental and theoretical approaches have been developed to predict sheet metal formability. The main theoretical models can be summarized as: the maximum force principle, according to which necking is associated with the maximum load in a uniaxial tensile test; Marciniak-Kuczyński (M-K) two-zone analysis, based on an initial thickness defect in the sheet; bifurcation theory, predicting diffuse necking with general bifurcation criterion or localized modes corresponding to loss of ellipticity; and more recently, linear stability analysis by means of linearization of perturbed equilibrium equations. Considering this variety of models, a careful comparison of numerical Forming Limit Diagrams (FLDs) along with in-depth understanding of their theoretical foundations is required to help select relevant localization criteria. In this paper, the theoretical bases of M-K and Rice's criteria are first reviewed, which are then applied to steels modeled by elasto-plastic constitutive equations coupled with damage. It is shown that the FLDs obtained with the M-K model tend to those yielded by Rice's criterion in the limit of vanishing initial imperfections.},
	issn = {1611-3683},
	edition = {Post-print},
	title = {Investigation of some localization criteria and their relevance to prediction of forming limit diagrams},
	number = {9},
	publisher = {Wiley},
	url = {http://hdl.handle.net/10985/10339}
}

@CONFERENCE{10985-10272,
	address = {France},
	isbn = {978-073540871-5},
	volume = {1315},
	pages = {419-424},
	booktitle = {AIP Conference Proceedings},
	year = {2011},
	author = {RACZ, Sever-Gabriel and KHAN, Salim and CHALAL, Hocine and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {Within the framework of sheet metal forming, the importance of hardening models for springback predictions has been often emphasized. While some specific applications require very accurate models, in many common situations simpler (isotropic hardening) models may be sufficient. In these conditions, investigation of the impact of hardening models requires well defined test configurations and accurate measurements to generate the reference data. Specific draw-bend tests have been especially conceived for this purpose. In this work, such a draw-bending experimental device has been designed, for use on a biaxial tension machine. Three different steel sheets have been tested (one mild steel sheet and two HSS sheets) with thicknesses between 0.8 and 2 mm. Up to three different back-force levels were used for the tests. Wall curvatures and springback angles were measured. Finite element simulations of the tests were performed. A parameter sensitivity analysis has been carried out in order to determine the numerical parameters ensuring accurate springback results. The tests were simulated using an isotropic hardening model and a combined isotropic-kinematic hardening model. The impact of the hardening model is explored for the various test configurations and conclusions are drawn concerning their relative importance.},
	edition = {Post-print},
	title = {Prediction of Springback After Draw‐Bending Test Using Different Material Models},
	publisher = {Francisco Chinesta , Yvan Chastel and Mohamed El Mansori},
	url = {10.1063/1.3552481}
}

@CONFERENCE{10985-13996,
	address = {Jamaïque},
	year = {2015},
	author = {BOUVIER, Salima and CARVALHO RESENDE, Tales and ABED-MERAIM, Farid  and BALAN, Tudor},
	abstract = {The aim of this work is to develop a dislocation density based model for IF and DP steels that incorporates details of the microstructure evolution at the grain-size scale. The model takes into account (i) the contribution of the chemical composition for the prediction of the initial yield stress, (ii) the description of initial texture anisotropy by incorporating grain-size dependent anisotropy coefficients in Hill’48 yield criterion, (iii) the contribution of three dislocation density “families” that are associated with forward, reverse and latent structures. It reproduces the macroscopic transient behaviors observed when strain-path changes occur. The model is implemented in FE code in order to assess its predictive capabilities in case of industrial applications.},
	edition = {Post-print},
	title = {Modelling the effect of microstructure evolution on the macroscopic behavior of single phase and dual phase steels: Application to sheet forming process},
	url = {http://hdl.handle.net/10985/13996}
}

@ARTICLE{10985-7857,
	journal = {Acta Materialia},
	volume = {60},
	pages = {948-957},
	year = {2012},
	author = {GU, G. C. and BECKER, Eric and SCHEEL, Mario and PESCI, Raphaël and LANGLOIS, Laurent},
	abstract = {Thixoforming of steels poses challenges due to the high temperatures involved and the lack of understanding of thermomechanical behavior. The volume fractions of the liquid and solid phases in the semi-solid state are the most important parameters for such a form-ing process, as they aﬀect the viscosity and hence the ﬂow behavior of the material. Two-dimensional observations might not always be suﬃcient, as the size distribution and the connectivity of phases cannot be obtained from associated measurements, which can only be determined by three-dimensional (3-D) investigation. This paper presents the ﬁrst application of high-energy X-ray microtomography to the microstructure of steel in the semi-solid state. The microstructure of M2 high-speed tool steel was studied in both as-received and heated-and-quenched states. From the reconstructed images, 3-D information could be obtained and was compared with scanning elec-tron microscopy and energy dispersive spectrometry observations. The volume fraction and the location of liquid phase in the semi-solid state were determined in particular, and the continuous solid skeleton was investigated.},
	issn = {1359-6454},
	edition = {Post-print},
	title = {Quantiﬁcation and localization of the liquid zone of partially remelted M2 tool steel using X-ray microtomography and scanning electron microscopy},
	number = {3},
	publisher = {Elsevier},
	url = {10.1016/j.actamat.2011.10.039}
}

@ARTICLE{10985-7719,
	journal = {Solid State Phenomena},
	volume = {192-193},
	pages = {191-196},
	year = {2013},
	author = {GU, Guochao and BECKER, Eric and PESCI, Raphaël and LANGLOIS, Laurent},
	abstract = {The distribution of liquid at the semi solid state is one of the most important parameters for steel thixoforging. It has a great influence on the viscosity of the material, on the flows and finally on the final shape and mechanical properties of the thixoforged parts. Both ex situ and in situ 3D X-ray microtomography characterizations have been carried out to determine the quantity and localization of liquid at high temperature of M2 steel slugs. Microtomography was first performed ex situ at room temperature on samples heated and quenched from semi-solid state. The specimens were also scanned in situ directly at high temperature. The obtained results have been compared to 2D observations using EDS technique in SEM on heated and quenched specimens. They showed a good correlation making both approaches very efficient for the study of the liquid zones at the semi-solid state.},
	issn = {0377-6883},
	edition = {Post-print},
	title = {Determination of quantity and localization of liquid in the semi-solid state using both 3D X-ray microtomography and 2D techniques for steel thixoforming},
	publisher = {Trans Tech Publications Ltd},
	url = {10.4028/www.scientific.net/SSP.192-193.191}
}

@ARTICLE{10985-8216,
	journal = {International Journal of Computer Integrated Manufacturing},
	volume = {24},
	pages = {610-626},
	year = {2011},
	author = {MARTIN, Patrick and DANTAN, Jean-Yves and D’ACUNTO, Alain},
	abstract = {In the context of concurrent engineering, the design of the parts, the production planning and the manufacturing facility must be considered simultaneously. The design and development cycle can thus be reduced as manufacturing constraints are taken into account as early as possible. Thus, the design phase takes into account the manufacturing constraints as the customer requirements; more these constraints must not restrict the creativity of design. Also to facilitate the choice of the most suitable system for a specific process, Virtual Manufacturing is supplemented with developments of numerical computations (Altintas et al. 2005, Bianchi et al. 1996) in order to compare at low cost several solutions developed with several hypothesis without manufacturing of prototypes. In this context, the authors want to predict the work piece geometric more accurately by considering machine defects and work piece set-up, through the use of process simulation. A particular case study based on a 3 axis milling machine will be used here to illustrate the authors’ point of view. This study focuses on the following geometric defects: machine geometric errors, work piece positioning errors due to fixture system and part accuracy.},
	issn = {0951-192X},
	edition = {Pre-print},
	title = {Virtual manufacturing: prediction of work piece geometric quality by considering machine and set-up},
	number = {7},
	publisher = {Taylor \& Francis},
	url = {10.1080/0951192X.2011.569952}
}

@ARTICLE{10985-9938,
	journal = {Precision Engineering},
	volume = {38},
	pages = {356-364},
	year = {2014},
	author = {PIQUARD, Romain and LAHEURTE, Pascal and DUDZINSKI, Daniel and D’ACUNTO, Alain},
	abstract = {This paper focuses on burr formation in micro-end milling of two Nickel-Titanium shape memory alloys (SMA), an austenitic and a martensitic NiTi. Phase transformation during machining was also examined. The experimental design approach was used to study the effect of cutting parameters on burr formation. The studied parameters were cutting speed, feed per tooth, depth and width of cut, 20 machining strategy and initial material phase of the NiTi alloy. Different types of burrs were formed during micro-end milling of NiTi alloys; it was observed that top burrs are the most important. The height of top burrs can reach values close to those of the depth of cut. Burrs were observed and characterized using a Scanning Electron Microscope (SEM), confocal and optical microscopes. The affected layer under the machined surface, and phase transformation 25 were investigated by using SEM. The results of the analysis of variance showed a significant formation of burrs, deeply influenced by the feed per tooth and width of cut. An increase in the feed per tooth and a decrease of width of cut tend to decrease the height and width of the top burr. In a thin layer under the machined surface, phase transformation was observed for the martensitic NiTi.},
	issn = {0141-6359},
	edition = {Post-print},
	title = {Micro-end milling of NiTi biomedical alloys, burr formation and phase transformation},
	number = {2},
	publisher = {Elsevier},
	url = {10.1016/j.precisioneng.2013.11.006}
}

@CONFERENCE{10985-10270,
	address = {République tchèque},
	isbn = {978-80-904077-7-0},
	pages = {1-6},
	booktitle = {Proceedings of the 11th International Conference on High Speed Machining},
	year = {2014},
	author = {PIQUARD, Romain and D’ACUNTO, Alain and DUDZINSKI, Daniel},
	abstract = {Micro-milling can be defined as milling with end mills smaller than 1 mm of diameter. The top-down approach from milling to micro-milling is often used to define cutting conditions. Unfortunately geometries either for the active part or the overall shape are quite different from conventional tools, leading to inexistent problems at the macro-scale, such as a larger cutting edge radius to uncut chip thickness ratio leading to ploughing effect. Moreover, micro-milling can be used on particular material such as shape memory alloys in biomedical domain which are difficult to machine. This study focuses on burr formation during shoulder milling for two biocompatible NiTi alloys: a martensitic NiTi (shape memory effect) and an austenitic one (pseudo-elasticity effect). Design of experiment is used to highlight the influence of various parameters (cutting parameters and material phases) on the burr formation in micro-milling NiTi alloys. Burrs were observed and measured using confocal, optical and electronic microscopy and tend to be as large as shoulders dimensions. Material phase transformation was also examined. Analysis of variance emphasizes that the larger the feed per tooth and the smaller the width of cut are, the smaller the top burr is. Cutting strategy leads to different burr shape: up-milling burrs have a large curvature, whereas down-milling burrs are slightly bent. An affected layer of about 10 μm has been observed for the austenitic NiTi. The proposed experimental approach give the opportunity to study burr formation in micro-milling, the machinability of alloys or superelastic NiTi shape memory and a qualitative explanation of burr formation has been developed.},
	edition = {Post-print},
	title = {Study of burr formation and phase transformation during micro-milling of NiTi alloys},
	publisher = {Czech Machine Tool Society},
	url = {http://hdl.handle.net/10985/10270}
}

@CONFERENCE{10985-10200,
	address = {République tchèque},
	isbn = {978-80-904077-7-0},
	pages = {6p.},
	booktitle = {Proceedings of the 11th International Conference on High Speed Machining},
	year = {2014},
	author = {PIQUARD, Romain and GILBIN, Alexandre and FONTAINE, Michaël and THIBAUD, Sébastien and DUDZINSKI, Daniel and D’ACUNTO, Alain},
	abstract = {In order to model micro-milling cutting forces, a way is to apply a local model on discretized elements of the cutting edge and then summing on the whole edge to obtain the global cutting forces. This local model is usually obtained by numerical simulation or cutting experimentation. This paper focuses on orthogonal and oblique micro-cutting experiments of AISI 6F7 with tungsten carbide tools. Results show the influence of cutting edge sharpness on cutting forces and the existence of different mechanisms corresponding to different ranges of uncut chip thickness values. A phenomenological model has been identified to model correctly these zones. Then, by comparing experimental micro-milling forces with those deduced from these micro-cutting model and tests, a good agreement has been found. In order to complete this study, phenomenological and thermo mechanical models are being developed. The aim is to obtain an elementary cutting model that can be used for micro-milling simulation and optimization.},
	edition = {Post-print},
	title = {Study of elementary micro-cutting in hardened tool steel},
	publisher = {Czech Machine Tool Society},
	url = {http://hdl.handle.net/10985/10200}
}

@MISC{10985-8555,
	year = {2011},
	author = {MARTIN, Patrick and MIHALUTA, Marius and PERRIN, Henri and D’ACUNTO, Alain},
	abstract = {La présente invention se rapporte à un dispositif de fabrication d'une pièce en matériau composite par moulage par injection de résine comprenant un moule de fabrication destiné à recevoir au moins une préforme, le moule étant subdivisé en une matrice et un ou plusieurs éléments structurels mobiles indexés sur la matrice, l'ensemble formant une empreinte correspondant à la forme de la pièce à fabriquer, caractérisé en ce que le moule est associé à au moins un cadre de mise en position dont les dilatations sont stables ou maitrisées dans au moins une direction, le cadre de mise en position étant conçu de manière à permettre l'indexation et le maintien d'un ou plusieurs éléments structurels mobiles, correspondant à au moins une singularité, sur la matrice.},
	edition = {Post-print},
	title = {Dispositif pour la fabrication d'une pièce composite par injection de résine},
	url = {http://hdl.handle.net/10985/8555}
}

@CONFERENCE{10985-9936,
	address = {France},
	pages = {1-9},
	booktitle = {Assises Machines et Usinage à Grande Vitesse 2014},
	year = {2014},
	author = {PIQUARD, Romain and GILBIN, Alexandre and FONTAINE, Michaël and DUDZINSKI, Daniel and THIBAUD, Sébastien and D’ACUNTO, Alain},
	abstract = {Cet article présente des essais de micro-coupe orthogonale et oblique à partir de tournage sur un acier 40NiCrMo16. Les résultats obtenus démontrent l’influence du rayon d’acuité d’arête sur les efforts mesurés notamment aux faibles épaisseurs de copeau non déformé. Les efforts spécifiques de coupe déduits sont en cohérence avec ceux obtenus lors d’essais de micro-fraisage issus de travaux précédents. Pour compléter l’étude, cet article pose les bases de la modélisation phénoménologique et thermomécanique adaptée à la micro-coupe. Le but à terme est d’obtenir un modèle de coupe élémentaire utilisable dans le cas du micro-fraisage puis de comparer les résultats obtenus aux résultats expérimentaux.},
	edition = {Post-print},
	title = {Expérimentation de la micro-coupe élémentaire sur un acier dur et comparaison au micro-fraisage},
	publisher = {Institut Français de Mécanique Avancée},
	url = {http://hdl.handle.net/10985/9936}
}

@CONFERENCE{10985-9898,
	address = {France},
	isbn = {978-2-9534170-2-9},
	pages = {251-257},
	booktitle = {Eigth International Conference on High Speed Machining},
	year = {2010},
	author = {ARTOZOUL, Julien and BOMONT-ARZUR, Anne and LESCALIER, Christophe and D’ACUNTO, Alain},
	abstract = {Metallurgical solutions for an improvement in machinability currently use nonmetallic inclusions in order to create solid lubricants at the interfaces between tool and workmaterial. It is possible to identify and quantify these layers afterwards. However it is important to know the conditions for which these layers appear: tribological conditions, kinematical conditions (i.e. cutting speed, feed and depth of cut) and thermomechanical conditions (stress and temperature distribution in the interfaces). We focus on the tool / chip interface and more precisely on the thermomechanical conditions. This contribution is concerned with both the analytical modeling and measurement of the temperature distribution in the chip forming zone. We propose a correlation between theoretical and experimental values.},
	edition = {Post-print},
	title = {Stress and heat flux distribution in rake face. Analytical and experimental approaches},
	publisher = {ENIM Editions},
	url = {http://hdl.handle.net/10985/9898}
}

@MISC{10985-8298,
	year = {2010},
	author = {MARTIN, Patrick and MIHALUTA, Marius and PERRIN, Henri-François and BETTEGA, Louis and CAUCHOIS, Jean-Pierre and CINI, Jérôme and PRADELLA, Serge and D’ACUNTO, Alain},
	abstract = {The invention relates to a device (IO) for ma.king a part of a composite material by resin-transfer moulding, that includes a manufacturing mould (IO) in which is placed a blank (1) of the part to be impregnated with resin, characterised in that the manufacturing mould (20) is divided into a matrix (21) and one or more mobile structural members (22) to be indexed on the matrix (21), the whole defining, after assembly, an imprint corresponding to the shape of the part to be manufactured.},
	edition = {Post-print},
	title = {Dispositif de fabrication d'une pièce en matériau composite par moulage par transfert de résine},
	url = {http://hdl.handle.net/10985/8298}
}

@MISC{10985-8556,
	year = {2011},
	author = {MARTIN, Patrick and MIHALUTA, Marius and PERRIN, Henri and D’ACUNTO, Alain},
	abstract = {La présente invention se rapporte à un procédé de fabrication d'une pièce en matériau composite à âme creuse (1) comprenant les étapes suivantes visant à : - appliquer au moins une couche adhésive (6) sur une surface ouverte de l'âme creuse, ledit procédé étant caractérisé en ce que la couche adhésive est une couche adhésive polymérisable bloquante présentant après polymérisation des propriétés d'étanchéité par rapport à une résine et apte à empêcher sa diffusion vers l'intérieur de l'âme creuse - procéder à la polymérisation de la couche adhésive bloquante de manière à réaliser l'étanchéité de l'âme creuse, ainsi qu'à une pièce correspondante.},
	edition = {Post-print},
	title = {Procédé de fabrication d'une pièce en matériau composite à âme creuse},
	url = {http://hdl.handle.net/10985/8556}
}