2026-04-08T19:27:51Zhttps://sam.ensam.eu/oai/request

oai:sam.ensam.eu:10985/92882025-11-06T07:46:15Zcom_10985_13596col_10985_177

Hybrid representation of digital mockup for heritage buildings management NICOLAS, Ghislain LANDRIEU, Jérémie NUGRAHA BAHAR, Yudi PÈRE, Christian Digital mock up BIM Mixed reality Old buildings 3D-layers Informatique: Synthèse d'image et réalité virtuelle This article deals with the implementation of tool allowing the portability of the digital mock-up for architectural projects on the building renovation place and the use of representation layers giving functions adapted to the different workers open to work in this place. Our test case is applied to renovation works on old windows in an ancient abbey where it is necessary to improve the thermal efficiency. 2013 Communication avec acte 1682-1750 http://hdl.handle.net/10985/9288 10.5194/isprsarchives-XL-5-W2-453-2013 en application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/9288 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/86172025-10-31T01:07:15Zcom_10985_13596col_10985_13598

Selección de indicadores de sostenibilidad para el diseño preliminar de edificios de oficinas desde el punto de vista energético VELÁZQUEZ ROMO, Ernesto Efrén NADEAU, Jean-Pierre poyo a la decisión edificios terciarios evaluación de la sostenibilidad diseño preliminar análisis del ciclo de vida Sciences de l'environnement: Environnement et Société Sciences de l'environnement: Ingénierie de l'environnement Sciences de l'ingénieur: Energie électrique Statistiques: méthodologie Pas de résumé 2012 Conférence invitée http://hdl.handle.net/10985/8617 es application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/8617 Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/190212025-10-31T01:55:49Zcom_10985_13596col_10985_192

How do 3D skeletal parameters influence kinetics? KARAM, Aya LABAKI, Chris MJAESS, Georges BIZDIKIAN, Aren Joe YARED, Fares OTAYEK, Joeffroy BAKOUNY, Ziad GHANEM, Ismat SKALLI, Wafa ASSI, Ayman Sciences du vivant Lower limb joints are subject to mechanical load during daily activities, such as gait, which is an important risk factor of osteoarthritis. Moreover, kinetics are known to be influenced by gait alterations in patients with osteoarthritis [1]. While skeletal parameters are known to determine gait kinematics [2], it is still unknown how skeletal parameters influence kinetic parameters. 2018 Article dans une revue avec comité de lecture 0966-6362 http://hdl.handle.net/10985/19021 10.1016/j.gaitpost.2018.06.046 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/19021 Gait and Posture Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/186052025-11-18T09:19:03Zcom_10985_13596col_10985_191

Shape parametrization of bio-mechanical finite element models based on medical images LAUZERAL, Nathan BORZACCHIELLO, Domenico KUGLER, Michaël GEORGE, Daniel RÉMOND, Yves HOSTETTLER, Alexandre CHINESTA SORIA, Francisco Computational anatomy - data driven modeling - liver atlas - mesh morphing - patient-specific modeling - Statistical shape model Sciences de l'ingénieur: Matériaux The main objective of this study is to combine the statistical shape analysis with a morphing procedure in order to generate shape-parametric finite element models of tissues and organs and to explore the reliability and the limitations of this approach when applied to databases of real medical images. As classical statistical shape models are not always adapted to the morphing procedure, a new registration method was developed in order to maximize the morphing efficiency. The method was compared to the traditional iterative thin plate spline (iTPS). Two data sets of 33 proximal femora shapes and 385 liver shapes were used for the comparison. The principal component analysis was used to get the principal morphing modes. In terms of anatomical shape reconstruction (evaluated through the criteria of generalization, compactness and specificity), our approach compared fairly well to the iTPS method, while performing remarkably better in terms of mesh quality, since it was less prone to generate invalid meshes in the interior. This was particularly true in the liver case. Such methodology offers a potential application for the generation of automated finite element (FE) models from medical images. Parametrized anatomical models can also be used to assess the influence of inter-patient variability on the biomechanical response of the tissues. Indeed, thanks to the shape parametrization the user would easily have access to a valid FE model for any shape belonging to the parameters subspace. 2019 Article dans une revue avec comité de lecture 2168-1163 http://hdl.handle.net/10985/18605 10.1080/21681163.2018.1447400 2168-1171 en application/pdf info:eu-repo/semantics/openAccess Taylor & Francis http://hdl.handle.net/10985/18605 Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/83672026-01-13T01:13:14Zcom_10985_13596col_10985_191

Molecular and macromolecular structure changes in polyamide 11 during thermal oxidation OKAMBA-DIOGO, Octavie VERDU, Jacques FERNAGUT, François GUILMENT, Jean FAYOLLE, Bruno RICHAUD, Emmanuel thermal oxidation polyamide chain scission carbonyl build up oxygen pressure Chimie: Matériaux Chimie: Polymères Sciences de l'ingénieur: Matériaux The present article reports a study of thermal oxidation of unstabilized polyamide 11 films at several temperatures (90–165 °C) under atmospheric pressure and under various oxygen pressures (up to 1.6 MPa) at 110 °C. The chemical structure changes are monitored by IR spectroscopy (carbonyl groups) and UV–visible spectrophotometry (yellowing). Molar mass changes are determined by size exclusion chromatography (SEC). By investigating the influence of oxygen pressure it is clearly shown that reactions involving P° radicals other than O2 addition cannot be neglected under atmospheric pressure. Under the conditions of this study limited to relatively low oxidation levels, IR and UV measurements indicate that carbonyl groups and chromophores responsible for yellowing have the same relative yield whatever the temperature and oxygen pressure. SEC measurements highlight the significant predominance of random chain scissions over crosslinking events. Crosslinking only appears after an induction time, presumably because it involves reactions between primary oxidation products. The ratio of carbonyl groups over chain scissions is about 7.5 at low conversion and about 2.5 at high conversion, showing that α amino alkoxy radicals are mainly transformed into imides without chain scission. 2014 Article dans une revue avec comité de lecture 0141-3910 http://hdl.handle.net/10985/8367 1873-2321 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8367 Polymer Degradation and Stability Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/90862025-11-06T07:46:14Zcom_10985_13596col_10985_13599

Using Web 3D technologies for involving consumers within the innovation process: an example through an e-commerce application LOUP-ESCANDE, Emilie ROLLAND, Romain YVAIN, Etienne RICHIR, Simon CHRISTMANN, Olivier Internet e-commerce Web3D Living Lab Informatique: Interface homme-machine Informatique: Modélisation et simulation Informatique: Synthèse d'image et réalité virtuelle Sciences de l'ingénieur: Traitement du signal et de l'image This paper aims to show to what extent the Web3D is an advantage for implementing the Living Lab approach. In order to achieve this objective, we develop a project the context of an Action-Research. A state-of-the-art of Web3D solutions for e-commerce enabled us to select the most suitable functionalities and properties for designing a 3D gates configurator for consumers. A panel of Twenty-seven participants evaluated this tool. Results show that an interactive 3-dimensional visualization of the object is an advantage for the sale, because a single image does not usually allow user to imagine the product in its future environment. The use of Web3D for e-commerce enables consumers to be involved in the design process for co-creating solutions, which is one of the main aspects of the Living Lab approach. 2012 Article dans une revue avec comité de lecture http://hdl.handle.net/10985/9086 en application/pdf info:eu-repo/semantics/openAccess IJDIR http://hdl.handle.net/10985/9086 International Journal of Design and Innovation Research Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/170242025-10-31T01:46:51Zcom_10985_13596col_10985_177

A 3D CAD assembly benchmark LUPINETTI, Katia GIANNINI, Franca MONTI, Marina PERNOT, Jean-Philippe Assembly retrieval Assembly similarity evaluation Sciences de l'ingénieur: Mécanique: Génie mécanique Evaluating the effectiveness of the systems for the retrieval of 3D assembly models is not trivial. CAD assembly models can be considered similar according to different criteria and at different levels (i.e. globally or partially). Indeed, besides the shape criterion, CAD assembly models have further characteristic elements, such as the mutual position of parts, or the type of connecting joint. Thus, when retrieving 3D models, these characteristics can match in the entire model (globally) or just in local subparts (partially). The available 3D model repositories do not include complex CAD assembly models and, generally, they are suitable to evaluate one characteristic at a time and neglecting important properties in the evaluation of assembly similarity. In this paper, we present a benchmark for the evaluation of content-retrieval systems of 3D assembly models. A crucial feature of this benchmark regards its ability to consider the various aspects characterizing the models of mechanical assemblies. 2019 Communication avec acte 1997-0471 http://hdl.handle.net/10985/17024 10.2312/3dor.20191065 en application/pdf info:eu-repo/semantics/openAccess Eurographics http://hdl.handle.net/10985/17024 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/211752025-10-31T02:03:55Zcom_10985_13596col_10985_13599col_10985_191

Enhanced parametric shape descriptions in PGD-based space separated representations KAZEMZADEH-PARSI, Mohammad Javad AMMAR, Amine DUVAL, Jean-Louis CHINESTA SORIA, Francisco Applied Mathematics Computer Science Applications Engineering (miscellaneous) Modelling and Simulation Space separated representation Complex geometries PGD NURBS Sciences de l'ingénieur Space separation within the Proper Generalized Decomposition—PGD—rationale allows solving high dimensional problems as a sequence of lower dimensional ones. In our former works, different geometrical transformations were proposed for addressing complex shapes and spatially non-separable domains. Efficient implementation of separated representations needs expressing the domain as a product of characteristic functions involving the different space coordinates. In the case of complex shapes, more sophisticated geometrical transformations are needed to map the complex physical domain into a regular one where computations are performed. This paper aims at proposing a very efficient route for accomplishing such space separation. A NURBS-based geometry representation, usual in computer aided design—CAD—, is retained and combined with a fully separated representation for allying efficiency (ensured by the fully separated representations) and generality (by addressing complex geometries). Some numerical examples are considered to prove the potential of the proposed methodology. 2021 Article dans une revue avec comité de lecture 2213-7467 http://hdl.handle.net/10985/21175 10.1186/s40323-021-00208-2 en application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/21175 Advanced Modeling and Simulation in Engineering Sciences Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA) Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/174552025-10-31T01:47:03Zcom_10985_13596col_10985_192

Mechanobiological stimuli for bone remodeling: mechanical energy, cell nutriments and mobility GEORGE, Daniel ALLENA, Rachele REMOND, Yves Sciences du vivant: ingénierie bio-médicale Mechanobiological stimuli for bone remodeling: mechanical energy, cell nutriments and mobility 2017 Article dans une revue avec comité de lecture 1025-5842 http://hdl.handle.net/10985/17455 10.1080/10255842.2017.1382876 1476-8259 en application/pdf info:eu-repo/semantics/openAccess Taylor & Francis http://hdl.handle.net/10985/17455 Computer Methods in Biomechanics and Biomedical Engineering Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/175552025-10-31T01:47:33Zcom_10985_13596col_10985_191

Rheokinetic of polyurethane crosslinking time-temperature-transformation diagram for rotational molding FARZANEH, Sedigheh RIVIERE, Sylvain TCHARKHTCHI, Abbas Sciences de l'ingénieur: Matériaux In this work, the rheokinetic of polyurethane crosslinking was studied by different methods: differential scanning calorimetric (DSC), rheometry, and infrared spectrometry. The conversion ratio and the glass transition temperature were followed by time of reaction. The results of the isothermal and nonisothermal test were compared. The evolution of viscosity was measured at different frequencies. The intersection of these curves is considered as gel point. A simplified mechanism has been proposed for crosslinking reactions. Based on this mechanism, a kinetic model describing the evolution of reactive system was developed. This model then was compared with the results of experiments performed by infrared spectrometry. The time-temperature- transformation diagram was established showing the evolution of physical state change of the reactive system. This diagram may be used to evaluate the zone of rotomoldability of the reactive polyurethane. 2012 Article dans une revue avec comité de lecture 0021-8995 http://hdl.handle.net/10985/17555 10.1002/app.34932 1097-4628 en application/pdf info:eu-repo/semantics/openAccess Wiley http://hdl.handle.net/10985/17555 Journal of Applied Polymer Science Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/63542025-10-31T01:26:42Zcom_10985_13596col_10985_179col_10985_177

Création d’un « étalon métrologique » d’une roue dentée sur Machine à Mesurer Tridimensionnelle DAVID, Jean-Marie LELEU, Stéphane BAUDOUIN, Cyrille GIBARU, Olivier Engrenages Incertitude Etalon MMT Multi-retournement Gears Deviations Measurement standard CMM Tooth by tooth rotation. Sciences de l'ingénieur: Mécanique La problématique de mesure de pièces complexes, présentant des formes symétriques suivant un axe de rotation telles que les roues dentées par exemple, avec de faibles incertitudes de mesures est exposée. La création d’un étalon de très grande qualité métrologique, à partir d’une pièce physique issue de la production, est présentée avec la mise en oeuvre d’une technique d’élimination d’erreurs par multi–retournement sous Machine à Mesurer Tridimensionnelle. L’objet du présent article est de décrire le processus d’élimination d’erreurs et de moyennage qui permet d’obtenir certaines caractéristiques de la pièce avec un niveau d’incertitudes très faibles. Cette analyse est effectuée théoriquement et confirmée par simulation numérique. Les résultats expérimentaux de la qualification d’un pignon conique de différentiel automobile par cette technique confirment son statut d’étalon métrologique avec un très faible niveau d’incertitudes, en particulier pour l’erreur de pas. The issue of the measurement of elaborate parts displaying symmetrical shapes along a rotation axis with low measurement deviations such as gears is addressed. The creation of a very high metrological quality measurement standard made from a manufactured physical part is exposed with the implementation of an error elimination method of tooth by tooth rotation on a Coordinate Measuring Machine. The purpose of this article is to describe the error elimination and averaging process enabling the acquiring of some characteristics of the part with a very low deviation level. This analysis is realised theoretically and confirmed with numerical simulation. Experimental results of the qualification of an automobile differential bevel gear with this technique confirm its very low deviation level measurement standard status, particularly for pitch error. 2007 Communication avec acte 5eme colloque international Conception et Production Intégrées, CPI-2007, Rabat-Maroc, 22-24 octobre 2007, 15p. http://hdl.handle.net/10985/6354 fr application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/6354 Laboratoire de Conception Fabrication Commande (LCFC) Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/155632025-10-31T01:41:21Zcom_10985_13596col_10985_184

Robust prediction of dense gas flows under uncertain thermodynamic models MERLE, Xavier CINNELLA, Paola Sciences de l'ingénieur A Bayesian approach is developed to quantify uncertainties associated with the thermodynamic models used for the simulation of dense gas flows, i.e. flows of gases characterized by complex molecules of moderate to high molecular weight, in thermodynamic conditions of the general order of magnitude of the liquid/vapor critical point. The thermodynamic behaviour of dense gases can be modelled through equations of state with various mathematical structures, all involving a set of material-dependent coefficients. For several organic fluids of industrial interest abundant and high-quality thermodynamic data required to specify such coefficients are hardly available, leading to undetermined levels of uncertainty of the equation output. Additionally, the best choice for the kind of equation of state (mathematical form) to be used is not always easy to determine and it is often based on expert opinion. In other terms, equations of state introduce both parametric and model-form uncertainties, which need to be quantified to make reliable predictions of the flow field. In this paper we propose a statistical inference methodology for estimating both kinds of uncertainties simultaneously. Our approach consists of a calibration step and a prediction step. The former allows to infer on the parameters to be input to the equation of state, based on the observation of aerodynamic quantities like pressure measurements at some locations in the dense gas flow. The subsequent prediction step allows to predict unobserved flow configurations based on the inferred posterior distributions of the coefficients. Model-form uncertainties are incorporated in the prediction step by using a Bayesian model averaging (BMA) approach. This consists in constructing an average of the predictions of various competing models weighted by the posterior model probabilities. Bayesian averaging also provides a useful tool for making robust predictions from a set of alternative calibration scenarios (Bayesian model-scenario averaging or BMSA). The proposed methodology is assessed for a class of dense gas flows, namely transonic flows around an isolated airfoil, at various free-stream thermodynamic conditions in the dense-gas region. 2019 Article dans une revue avec comité de lecture 0951-8320 http://hdl.handle.net/10985/15563 10.1016/j.ress.2018.11.009 1879-0836 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/15563 Reliability Engineering and System Safety Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/95642025-11-06T08:01:15Zcom_10985_13596col_10985_6694

Modélisation numérique de l'hydrovoile Wils MODELISATION NUMERIQUE DE L’HYDROVOILE WILS WILS, Gérard SIMONET, Sophie BAYEUL-LAINÉ, Annie-Claude Hydrolienne Hydrovoile Modélisation numérique Energie renouvelable Récupération d’énergie Sciences de l'environnement: Ingénierie de l'environnement Les hydroliennes permettent la transformation de l’énergie cinétique des courants marins et fluviaux en électricité. Le mouvement des mers et des cours d’eau étant une source quasi-inépuisable d’énergie, un développement important de la conception des hydroliennes dans le cadre du développement durable a vu le jour ces dernières années. La présente étude concerne une hydrolienne originale inventée et mise au point par M. Gérard Wils. Cet article propose de présenter le résultat d’une collaboration entre le Laboratoire de Mécanique de Lille, M. Gérard Wils, la région Nord Pas de Calais, Ifremer, l’Ecole des Mines de Douai et Ensait/Innotex dans le cadre d’un soutien CATTC (Contrat d’accès au transfert de technologie et de compétences. A présent connue sous l’acronyme HYDL (hydrolienne à déplacement linéaire), l’originalité de cette hydrolienne consiste dans le fait que la récupération de l’énergie ne se fait pas au travers de la rotation d’une roue, mais par le déplacement de voiles placées à égale distance les unes des autres, reliées entre elles par deux câbles. Ces câbles transmettent l’effort récupéré sur chaque voile à deux tambours qui permettent la production de courant électrique. Le but de l’article est de présenter la modélisation numérique de cette hydrovoile à l’aide du code de calcul Star CCM+ et de donner un certain nombre de résultats caractérisant la performance de cette machine. 2015 Article dans une revue avec comité de lecture 1737-9296 http://hdl.handle.net/10985/9564 fr application/pdf info:eu-repo/semantics/openAccess Ravi Mittal http://hdl.handle.net/10985/9564 International Journal of Scientific Research & Engineering Technology (IJSET) Laboratoire de Mécanique des Fluides de Lille (LMFL)

oai:sam.ensam.eu:10985/85832025-11-18T09:17:32Zcom_10985_13596col_10985_184

Etude numérique des gains de performances et de capacité d'aspiration apportés par un étage axial contra-rotatif par rapport à une pompe mono-rotor. DANLOS, Amélie SOLIS, Moises RAVELET, Florent BAKIR, Farid Pompe axiale contra-rotative Cavitation Sciences de l'ingénieur: Mécanique: Mécanique des fluides This study deals with the development of an efficient method of design for subsonic conter-rotating axial flow turbomachineries. From specifications of a reference axial pump with only one rotor, two configurations of counter-rotating systems are studied : a system with a lower specific speed, and a system with a smaller specific radius. The numerical study is conducted in stationary regime, with a RANS-type turbulence model. Numerical simulations of the flow in stationary cavitating conditions use an homogeneous model at the thermodynamic equilibrium state. Results obtained for the two counter-rotating systems increase the yield of 12% for the same operating point. The first configuration decreases the size of 25%, which is a favorable for the manufacturing cost and the use in the system. The second configuration allows to obtain a lower speed of rotation (35%) which is beneficial for the increase of the suction capacity. 2013 Communication avec acte http://hdl.handle.net/10985/8583 fr application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/8583 Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/113332025-12-16T15:32:39Zcom_10985_13596col_10985_179

An alternative explanation of forming force reduction for forming process submitted to vibration: Influence of the waveform in the viscoplastic domain KHAN, Armaghan GIRAUD-AUDINE, Christophe BIGOT, Régis ABBA, Gabriel ABIDEEN, M. Z. Forming process Vibrations Viscoplasticity Load reduction Sciences de l'ingénieur: Mécanique This article addresses the effects of vibrations on a viscoplastic workpiece applied during the forgingprocess. To achieve this goal, a phenomenological model based on the slice method combined with aNorton–Hoff viscoplastic law is developed. It allows to study the impact of vibration on the reductionof the mean forging load which has been experimentally observed before, and demonstrates that thesensitivity to strain rate is a key parameter. Moreover, based on the model, a new waveform of thevibrations is proposed that enhance the mean forging load reduction. Finite element simulations andexperiments have been performed to evaluate the validity of the model in the case of sinusoidal andtriangular waveforms, and are in good agreement with the analytical model’s predictions. 2016 Article dans une revue avec comité de lecture 0924-0136 http://hdl.handle.net/10985/11333 10.1016/j.jmatprotec.2015.11.019 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/11333 Journal of Materials Processing Technology Laboratoire de Conception Fabrication Commande (LCFC)

oai:sam.ensam.eu:10985/85122026-03-03T01:14:19Zcom_10985_13596col_10985_13599

Experimental and numerical analysis of micromechanical damage in the punching process for High-Strength Low-Alloy steels ACHOURI, Mohamed GERMAIN, Guénaël DAL SANTO, Philippe SAIDANE, Delphine Punching Damage Fracture initiation Micro-voids Numerical simulation Stress state Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Sequential sheet metal forming processes can result in the accumulation of work hardening and damage effects in the workpiece material. The mechanical strength of the final component depends on the “evolution” of these two characteristics in the different production steps. The punching process, which is usually in the beginning of the production chain, has an important impact on the stress, strain and damage states in the punched zones. It is essential that the influence of these mechanical fields be taken into account in the simulation of the forming sequence. In order to evaluate the evolution of each phenomenon, and in particular damage accumulation in the forming process, it is essential to characterize the punching process. The objective of this work is to understand and identify the physical damage mechanisms that occur during the punching operation and to establish relevant numerical models to predict the fracture location. The effect of the punch–die clearance on mechanical fields distribution is also discussed in this work. 2014 Article dans une revue avec comité de lecture 0264-1275 http://hdl.handle.net/10985/8512 10.1016/j.matdes.2013.11.016 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8512 Materials and Design Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/68542025-11-06T07:54:48Zcom_10985_13596col_10985_177

How 3D Interaction Metaphors Affect User Experience in Collaborative Virtual Environment HRIMECH, Hamid ALEM, Leila MERIENNE, Frédéric Virtual reality Informatique: Interface homme-machine Informatique: Synthèse d'image et réalité virtuelle In this paper we presents the results of our experimental study which aims to understand the impact of three interaction 3D metaphors (ray casting, GoGo, and virtual hand) on the user experience in a semi-immersive collaborative virtual environment (the Braccetto System). For each session, participants are grouped in twos to reconstruct a puzzle by an assemblage of cubes. The puzzle to reconstruct corresponds to a gradient of colors. We found that there is a significant difference in the user experience by changing the interaction metaphor on the copresence, awareness, involvement, collaborative effort, satisfaction usability, and preference. These findings provide a basis for designing 3D navigation techniques in a CVE. 2011 Article dans une revue avec comité de lecture 1687-5893 http://hdl.handle.net/10985/6854 10.1155/2011/172318 en application/pdf info:eu-repo/semantics/openAccess Hindawi http://hdl.handle.net/10985/6854 Advances in Human-Computer Interaction Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/262012026-01-13T01:34:26Zcom_10985_13596col_10985_192

Understanding vibration exposure in wheelchair users: Experimental insights CHADEFAUX, Delphine LARIVIERE, Ophélie SAURET, Christophe BOSIO, Corentin THOREUX, Patricia Factorial design experiment Manual wheelchair Vibration Sciences de l'ingénieur: Mécanique: Vibrations Sciences de l'ingénieur: Mécanique: Biomécanique Addressing the complexities of manual wheelchair (MWC) vibrations is crucial for the well-being of users and their integration into society. This study investigates the experimental choices influencing the assessment of vibration exposure, aiming to contribute for enhanced MWC developments and standardized design principles. By conducting a comprehensive full factorial experiment, the impact of various factors, including four MWC loads, two speeds, five floor types, and two MWC models was examined. Notably, findings highlight the predominant influence of floor type on vibration exposure, followed by speed and, to a lesser extent, MWC properties. Furthermore, the study suggests that enlisting an able-bodied participant is more representative than using a dummy when loading the MWC, providing valuable insights into the genuine MWC/user dyad response to vibrations. This research sets the stage for a more informed and standardized approach to address the vibration exposure faced by MWC users. 2024-11 Article dans une revue avec comité de lecture 1350-4533 http://hdl.handle.net/10985/26201 10.1016/j.medengphy.2024.104253 1873-4030 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/26201 Medical Engineering & Physics Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/74832025-11-18T09:08:54Zcom_10985_13596col_10985_177

Joint Platform for the Real-Scale 3D Visualization of Conceptual Design Incorporating Semantic HATTAR, Gunjeet MIRZAEI, Mohammad Ali MERIENNE, Frédéric CHARDONNET, Jean-Rémy GARBAYA, Samir Multi-touch table Real-scale visualization Joint-platform Conceptual design and semantic Informatique: Interface homme-machine Informatique: Synthèse d'image et réalité virtuelle The need for a collaborative approach that can easily manifest the basic ideas into a semantic enriched Virtual Environment is felt. To realize the same, a clear combination of two individual processes is applied. Beginning with the manipulation and semantic addition to 2-Dimensional geometric shapes, a concise 3D model is generated. The latter serves as an input to a much interactive system, e.g., a CAVE, for better visualization and interaction with the model. The idea became completed by joining table-touch and real-scale 3D visualization system. However, on question remained unknown ``what is the effect of this kind of visualization on an end-user?'' This paper tries to find out an appropriate answer to the question only in terms of gender difference. The results show significant difference between female and male populations. 2013 Communication avec acte http://hdl.handle.net/10985/7483 en_US application/pdf info:eu-repo/semantics/openAccess Association Française de Réalité Virtuelle http://hdl.handle.net/10985/7483 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/90122025-10-31T01:23:14Zcom_10985_13596col_10985_184

Nonlinear control of unsteady finite-amplitude perturbations in the Blasius boundary-layer flow CHERUBINI, Stefania DE PALMA, Pietro ROBINET, Jean-Christophe boundary layer control instability control nonlinear instability Sciences de l'ingénieur: Mécanique: Mécanique des fluides The present work provides an optimal control strategy, based on the nonlinear Navier–Stokes equations, aimed at hampering the rapid growth of unsteady finite-amplitude perturbations in a Blasius boundary-layer flow. A variational procedure is used to find the blowing and suction control law at the wall providing the maximum damping of the energy of a given perturbation at a given target time, with the final aim of leading the flow back to the laminar state. Two optimally growing finite-amplitude initial perturbations capable of leading very rapidly to transition have been used to initialize the flow. The nonlinear control procedure has been found able to drive such perturbations back to the laminar state, provided that the target time of the minimization and the region in which the blowing and suction is applied have been suitably chosen. On the other hand, an equivalent control procedure based on the linearized Navier–Stokes equations has been found much less effective, being not able to lead the flow to the laminar state when finite-amplitude disturbances are considered. Regions of strong sensitivity to blowing and suction have been also identified for the given initial perturbations: when the control is actuated in such regions, laminarization is also observed for a shorter extent of the actuation region. The nonlinear optimal blowing and suction law consists of alternating wall-normal velocity perturbations, which appear to modify the core flow structures by means of two distinct mechanisms: (i) a wall-normal velocity compensation at small times; (ii) a rotation-counterbalancing effect al larger times. Similar control laws have been observed for different target times, values of the cost parameter, and streamwise extents of the blowing and suction zone, meaning that these two mechanisms are robust features of the optimal control strategy, provided that the nonlinear effects are taken into account. 2013 Article dans une revue avec comité de lecture 0022-1120 http://hdl.handle.net/10985/9012 10.1017/jfm.2013.576 1469-7645 en application/pdf info:eu-repo/semantics/openAccess Cambridge University Press (CUP) http://hdl.handle.net/10985/9012 Journal of Fluid Mechanics Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/113262025-12-13T01:26:41Zcom_10985_13596col_10985_177

Understanding pilot biodynamical feedthrough coupling in helicopter adverse roll axis instability via lateral cyclic feedback control TOD, Georges PAVEL, Marilena BARRE, Pierre-Jean GOMAND, Julien MALBURET, François Rotorcraft–pilot couplings Pilot biodynamics Aeroelastic stability Helicopters Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Biomécanique The authors thank Joost Venrooij, Project Leader at the Max Planck Institute for Biological Cybernetics, for providing the experimental results obtained on SIMONA flight simulator (TU Delft). The paper reassesses the mechanism of biodynamical feedthrough coupling to helicopter body motion in lateral-roll helicopter tasks. An analytical bio-aeroelastic pilot–vehicle model is first developed and tested for various pilot's neuromuscular adaptions in the lateral/roll axis helicopter tasks. The results demonstrate that pilot can destabilize the low-frequency regressing lead-lag rotor mode; however he/she is destabilizing also the high-frequency advancing lag rotor mode. The mechanism of pilot destabilization involves three vicious energy circles, i.e. lateral-roll, flap-roll and flap-lag motions, in a very similar manner as in the air resonance phenomenon. For both modes, the destabilization is very sensitive to an increase of the steady state rotor coning angle that increases the energy transfers from flap to lag motion through Coriolis forces. The analytical linear time-invariant model developed in this paper can be also used to investigate designs proneness to lateral/roll aeroelastic rotorcraft–pilot couplings. This work was supported by the “Complex Mechanical Systems Dynamics” Chair – Airbus Group Foundation and the engineering school Arts et Metiers Paristech. 2016 Article dans une revue avec comité de lecture 1270-9638 http://hdl.handle.net/10985/11326 10.1016/j.ast.2016.10.003 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/11326 Aerospace Science and Technology Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/154412025-10-31T01:44:40Zcom_10985_13596col_10985_191

Thermal oxidation of aromatic epoxy-diamine networks DELOZANNE, Justine DESGARDIN, Nancy CUVILLIER, Nicolas RICHAUD, Emmanuel Epoxy-diamine - FTIR - Thermal oxidation Sciences de l'ingénieur The thermal oxidation of DGEBA-DDS (bisphenol A diglycidyl ether + 4,4′-diaminodiphenyl sulfone) and TGMDA-DDS (4,4′-methylenebis(N,N-diglycidylaniline) + 4,4′-diaminodiphenyl sulfone) was performed at 80, 120, and 200 °C and was monitored by FTIR. Oxidation was shown to generate amides and carbonyls. Comparisons were done with model systems displaying some common reactive groups, which highlighted the predominating role of methylene in α position of ether in DGEBA-DDS and methylene in α position of nitrogen hold by TGMDA in TGMDA-DDS. The participation of CH2 in α position of DDS hardener group seems to depend on the temperature and decrease when lowering it. The oxidation of such complex systems must hence be described by a co-oxidation model where each kind of reactive sites is described by its own set of kinetic constants. 2019 Article dans une revue avec comité de lecture 0141-3910 http://hdl.handle.net/10985/15441 10.1016/j.polymdegradstab.2019.05.030 1873-2321 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/15441 Polymer Degradation and Stability Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/215352025-10-31T02:07:35Zcom_10985_13596col_10985_182col_10985_177

Tunable electromagnetic resonant shunt using pulse-width modulation AULELEY, Michel MAHE, Hervé THOMAS, Olivier GIRAUD-AUDINE, Christophe Adaptive shunt Tunable shunt Resonant shunt Pulse-width modulation Electro-magnetic transduction Analog electronics Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Electronique This article proposes a novel mean for tuning the natural frequency of an electromagnetic resonant shunt, using a pulse-width modulation (PWM) circuit. It is used to modulate the value of the capacitance of the shunt, and the electrical frequency is shown to be proportional to the command parameter of the PWM, the duty cycle. An easy and efficient strategy to tune the resonant shunt in real time is then proposed, thus obtaining a low powered and always stable vibration control device. The article proposes the theory of PWM, giving a robust method to predict the dynamics of the system. Then, an accurate multi-mode theoretical model of the tunable resonant shunt coupled to an elastic structure is proposed and experimentally validated on an elastic multi-mode structure, in the case of two different control strategies. The first one is a standard resonant shunt with both the electrical frequency and damping optimized to reduce a given resonance peak. The second one is based on a resonant shunt with the electrical damping as low as possible, which creates an antiresonance and a “notch” type mechanical response at the driving frequency. Both strategies are experimentally validated with real time variation and adaptation of the electrical frequency, obtaining an efficient vibration control device, able to reduce by a factor 40 the vibration level. 2021 Article dans une revue avec comité de lecture 0022-460X http://hdl.handle.net/10985/21535 10.1016/j.jsv.2021.116018 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/21535 Journal of Sound and Vibration Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/256272025-10-31T02:24:50Zcom_10985_13596col_10985_13598

Unlocking the power of LiOH: Key to next-generation ultra-compact thermal energy storage systems ACHCHAQ, Fouzia MOON, S.-C. LEGROS, P. Alkali metal hydroxide Anisotropy Enthalpy-temperature function PCM Softening Thermal property Ultra-compact TES Sciences de l'ingénieur This study explores the potential of untapped lithium hydroxide (LiOH) as a phase change material for thermal energy storage. By overcoming the challenges associated with the liquid LiOH leakage, we successfully thermal-cycled LiOH in a laboratory scale experimentation, and observed its stability (>500 thermal cycles), without chemical decomposition. This step has never been performed to date. Its solid-to-liquid reversible transitions temperatures and related solidification/melting enthalpies values have been verified. Then, the first experimental characterization of LiOH's thermal properties shows unexpected values for its heat capacity, thermal conductivity and diffusivity, in contradiction with the few ones available in literature. This opens avenues for LiOH's applications for the storage of sensible and latent heat, as shown through the increased cycle efficiency potential of a thermal energy storage system if based on its energy storage capacity; up to six times more volumetric energy density compared to traditional Solar Salt-based systems used in the solar tower plant (4.5 GJ/m3 vs. 0.76 GJ/m3 over 1000 thermal cycles). Additionally, we observed a softening phenomenon that occurs inconsistently during heating, but which may account for its excellent melting properties and the interplay with other raw chemicals. This new insight contributes certainly to the underlying mechanisms in the synthesis of another promising heat storage material in development: the peritectic compound Li4Br(OH)3. This pioneering work suggests LiOH as a promising ultra-compact thermal energy storage material for filling the intermediary gap from current to next-generation solar power plants, although its large-scale application requires further investigation to achieve economic viability. 2024-07 Article dans une revue avec comité de lecture 2405-8440 http://hdl.handle.net/10985/25627 10.1016/j.heliyon.2024.e33992 https://www.cell.com/cms/10.1016/j.heliyon.2024.e33992/attachment/ee0619d1-30f8-4e19-8b68-d300d9b89ecc/mmc1.docx en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/25627 Heliyon Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/107932025-10-31T01:19:13Zcom_10985_13596col_10985_6566

About the relevance of roughness parameters used for characterizing worn femoral heads NAJJAR, Denis BIGERELLE, Maxence MIGAUD, Henri IOST, Alain Femoral head Topography Roughness parameters Analysis of Variance Computer-Based Bootstrap Method Informatique: Traitement du signal et de l'image Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Biomécanique This study aims to contribute to the definition of a methodology, which can help to select a relevant roughness parameter with a view to describing the topography of orthopaedic bearing surfaces. In this investigation, the surface topography of a retrieved titanium alloy (TA6V) femoral head was characterized using visual inspection, optical microscopy and three-dimensional contacting profilometry. A numerical analysis of roughness measurements was then undertaken to assess in a first step the values of different roughness parameters of interest found in papers dealing with the topography of orthopaedic bearing surfaces. In a second step, the Analysis of Variance (ANOVA) and the Computer-Based Bootstrap Method were combined to determine statistically, and without preconceived opinion, which of those parameters is the most relevant to describe the different investigated worn regions of the studied femoral head. 2006 Article dans une revue avec comité de lecture 0301-679X http://hdl.handle.net/10985/10793 10.1016/j.triboint.2006.01.018 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/10793 Tribology International Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/230122025-10-31T02:14:02Zcom_10985_13596col_10985_189

Effect of Pre-Oxidation on a Ti PVD Coated Ferritic Steel Substrate during High-Temperature Aging ARDIGO-BESNARD, Maria-Rosa BESNARD, Aurélien NKOU BOUALA, Galy BOULET, Pascal PINOT, Yoann OSTORERO, Quentin physical vapor deposition pre-oxidation coating adhesion titanium ferritic stainless steel Chimie: Matériaux Sciences de l'ingénieur: Micro et nanotechnologies/Microélectronique A PVD coating is often applied on the surface of metallic alloys to improve their high-temperature resistance. In the present work, a thin titanium layer (1.2 µm) was deposited by PVD on the surface of a stainless steel substrate before high-temperature exposure (800 °C in ambient air). The underlying idea is that metallic Ti converts into Ti oxide (TiO2) during high-temperature aging at 800 °C, thereby slowing down the substrate oxidation. The stability of the coating with and without substrate pre-oxidation was investigated. Morphological, structural, and chemical characterizations were performed and completed by simulation of the film growth and measurement of the mechanical state of the film and the substrate. In the case of the sample that was not pre-oxidized, the oxidation of the steel was slowed down by the TiO2 scale but spallation was observed. On the other hand, when the steel was pre-oxidized, TiO2 provided more significant protection against high-temperature oxidation, and spalling or cracking did not occur. A combination of different kinds of stress could explain the two different behaviors, namely, the mechanical state of the film and the substrate before oxidation, the growing stress, and the thermal stress occurring during cooling down. 2022-12-01 Article dans une revue avec comité de lecture 2073-4352 http://hdl.handle.net/10985/23012 10.3390/cryst12121732 en application/pdf info:eu-repo/semantics/openAccess MDPI AG http://hdl.handle.net/10985/23012 Crystals Laboratoire des Matériaux et Procédés (LaBoMaP)

oai:sam.ensam.eu:10985/196572025-10-31T01:58:40Zcom_10985_13596col_10985_13597col_10985_184

On the linear receptivity of trailing vortices BÖLLE, Tobias BRION, Vincent SIPP, Denis JACQUIN, Laurent ROBINET, Jean-Christophe vortex dynamics general fluid mechanics Sciences de l'ingénieur: Mécanique: Mécanique des fluides The present work investigates the excitation process by which free-stream disturbances are transformed into vortex-core perturbations. This problem of receptivity is modelled in terms of the resolvent in frequency space as the linear response to forcing. This formulation of receptivity suggests that non-normality of the resolvent is necessary to allow free-stream disturbances to excite the vortex core. Considering a local (in frequency) measure of non-normality, we show that vortices are frequency-selectively non-normal in a narrow frequency band of retrograde perturbations while the rest of the range is governed by an effectively normal operator, thus not contributing to receptivity. Canonical decomposition of the resolvent reveals that vortices are most susceptible to coiled filaments localised about the critical layer that induce bending waves on the core. Considering Lamb–Oseen, Batchelor and Moore–Saffman vortices as reference-flow models, we find free-stream receptivity to be essentially generic and independent of the axial wavelength on the considered range. A stochastic interpretation of the results could be a model for trailing-vortex meandering. This work has been supported by the French Ministry of Civil Aviation (DGAC) under PHYWAKE (PHYsics of WAKE vortices) research program. We are grateful to the anonymous referees for their exceptional investment and insightful suggestions. 2020 Article dans une revue avec comité de lecture 0022-1120 http://hdl.handle.net/10985/19657 10.1017/jfm.2020.898 1469-7645 en application/pdf info:eu-repo/semantics/openAccess Cambridge University Press (CUP) http://hdl.handle.net/10985/19657 Journal of Fluid Mechanics Autres équipes Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/251612026-02-19T01:37:07Zcom_10985_13596col_10985_191

Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes ALÉON-TOPPANI, Alice BRUNETTO, Rosario DIONNET, Zélia RUBINO, Stefano BAKLOUTI, Donia BRISSET, François VALLET, Maxime HERIPRE, Eva NAKAMURA, Tomoki LANTZ, Cateline DJOUADI, Zahia BORONDICS, Ferenc SANDT, Christophe TROADEC, David MIVUMBI, Obadias MATSUMOTO, Megumi AMANO, Kana MORITA, Tomoyo YURIMOTO, Hisayoshi NOGUCHI, Takaaki OKAZAKI, Ryuji YABUTA, Hikaru NARAOKA, Hiroshi SAKAMOTO, Kanako TACHIBANA, Shogo YADA, Toru NISHIMURA, Masahiro NAKATO, Aiko MIYAZAKI, Akiko YOGATA, Kasumi ABE, Masanao OKADA, Tatsuaki USUI, Tomohira YOSHIKAWA, Makoto SAIKI, Takanao TANAKA, Satoshi TERUI, Fuyuto NAKAZAWA, Satoru WATANABE, Sei-Ichiro TSUDA, Yuichi Geochemistry and Petrology Ryugu Meteorites Transmission electron microscopy Infrared spectroscopy Aqueous alteration Sciences de l'ingénieur Sciences de l'environnement: Ingénierie de l'environnement In order to better constrain the alteration history of the Ryugu parent body, we performed a multi-analytical study combining scanning electron microscopy, transmission electron microscopy and infrared spectroscopy on sections extracted from the three fragments A0064-FO019, A0064-FO021 and C0002-FO019 returned from Ryugu by the Hayabusa2 space mission. The three sections show large differences in terms of structure, mineralogy and infrared signature. Section A0064-FO019 resembles the major Ryugu lithology with the presence of both fine-grained phyllosilicates (fg-phyllos) with embedded nanosulfides and coarse-grained phyllosilicates (cg-phyllos), whereas section C0002-FO019 belongs to the group of the less altered lithologies with the presence of anhydrous minerals embedded in a partially amorphous matrix. Section A0064-FO021 also belongs to this group but shows two different lithologies, a compact amorphous one and a more porous and very fractured one showing the presence of Na-rich phosphate, calcite and olivine. The two less altered lithologies (sections A0064-FO021 and C0002-FO019) show the presence of numerous mineralogical features similar to those observed in cometary interplanetary dust particles, ultra-carbonaceous Antarctic micrometeorites or in the CM Paris meteorite, i.e. amorphous and partially crystallized matrix with GEMS-like ghosts objects, whisker olivine, phosphide, or FeNi metal. This supports an outer solar system origin common with that of cometary material for the Ryugu parent body. Combined with the results of Nakamura et al. (2022b) reporting the presence of a lithology showing the presence of GEMS-like objects, we propose that section C0002-FO019 represents the onset of aqueous alteration of such primitive materials. The cg-phyllos and fg-phyllos of section A0064-FO019, i.e. of the major Ryugu lithology, representing the advanced stage of alteration, exhibit distinctive IR signatures with a higher abundance of oxygen-rich functional groups in the organic matter (OM) from the cg-phyllos. We thus suggest the following chronology of formation and evolution for Ryugu: (1) accretion of highly porous aggregate of GEMS-like units with fine-grained high-temperature anhydrous silicates, (2) onset of alteration with the dissolution of primary nanosulfides and development of amorphous/partially crystallized material in the pores, (3) crystallization of fg-phyllos with a second generation of sulfides, (4) later formation of cg-phyllos devoid of nanosulfides and their associated oxygen-rich OM in a more water-rich environment. 2024-02 Article dans une revue avec comité de lecture 0016-7037 http://hdl.handle.net/10985/25161 10.1016/j.gca.2024.02.006 1872-9533 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/25161 Geochimica et Cosmochimica Acta Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/101652025-11-06T07:59:22Zcom_10985_13596col_10985_6657

Open ocean regimes of relative dispersion OLLITRAULT, Michel GABILLET, Céline COLIN DE VERDIERE, Alain Sciences de l'ingénieur: Mécanique: Mécanique des fluides As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson regime (D2∼t3 asymptotically) for r.m.s. separation distances between 40 and 300 km, in agreement with a D4/3 law. At early times, and for smaller separation distances, an exponential growth, in agreement with a D2 law, was briefly observed but only for the eastern cluster (with an e-folding time around 6 days). After a few months or separation distances greater than 300 km, the relative dispersion slowed down naturally to the Taylor absolute dispersion regime. 2005 Article dans une revue avec comité de lecture 0022-1120 http://hdl.handle.net/10985/10165 10.1017/S0022112005004556 1469-7645 en application/pdf info:eu-repo/semantics/openAccess Cambridge University Press (CUP) http://hdl.handle.net/10985/10165 Journal of Fluid Mechanics Institut de Recherche de l’École navale (IRENAV)

oai:sam.ensam.eu:10985/244872025-10-31T02:19:08Zcom_10985_13596col_10985_6694

Attractors for the motion of a finite-size particle in a two-sided lid-driven cavity WU, Haotian ROMANO, Francesco KUHLMANN, Hendrik C. Mechanical Engineering Mechanics of Materials Condensed Matter Physics Chaotic advection Particle/fluid flow Sciences de l'ingénieur: Mécanique: Mécanique des fluides The motion of a single spherical particle in a two-sided lid-driven cavity is investigated experimentally. The flow in which the particle moves is created by two facing cavity sidewalls which move with equal velocity in opposite directions. For a long cavity with width-to-height cross-sectional aspect ratio Γ=W/H=1.6 the flow field at Reynolds number Re=400 consists of steady spatially periodic three-dimensional convection cells. Nearly neutrally buoyant particles with radius in units of H ranging from 1.1×10−2 to 7.1×10−2 are found to be attracted to periodic or quasi-periodic orbits in close vicinity of Kolmogorov–Arnold–Moser (KAM) tori of the unperturbed flow. Like the KAM tori the attractors of neutrally buoyant particles arise in mirror-symmetric pairs within each convection cell. The particle attractors are created by a dissipative effect in the dynamical system describing the particle motion which arises when the finite-size particle closely passes the moving walls. When the particle density deviates from that of the fluid, inertial attractors arise whose symmetry is broken by buoyancy, and other periodic attractors are created which do not have KAM tori as counterparts. 2020-11 Article dans une revue avec comité de lecture 0022-1120 http://hdl.handle.net/10985/24487 10.1017/jfm.2020.768 1469-7645 en application/pdf info:eu-repo/semantics/openAccess Cambridge University Press (CUP) http://hdl.handle.net/10985/24487 Journal of Fluid Mechanics Laboratoire de Mécanique des Fluides de Lille (LMFL)

oai:sam.ensam.eu:10985/187382025-10-31T01:59:19Zcom_10985_13596col_10985_191

Natural Element Method for the Simulation of Structures and Processes Chinesta/Natural Element Method for the Simulation of Structures and Processes CESCOTTO, Serge CUETO, Elias LORONG, Philippe CHINESTA SORIA, Francisco Sciences de l'ingénieur: Matériaux Computational mechanics is the discipline concerned with the use of computational methods to study phenomena governed by the principles of mechanics. Before the emergence of computational science (also called scientific computing) as a "third way" besides theoretical and experimental sciences, computational mechanics was widely considered to be a sub-discipline of applied mechanics. It is now considered to be a sub-discipline within computational science. This book presents a recent state of the art on the foundations and applications of the meshless natural element method in computational mechanics, including structural mechanics and material forming processes involving solids and Newtonian and non-Newtonian fluids.(4th cover, excerpt from publisher's website) 2013 Ouvrage scientifique 978-1-848-21220-6 http://hdl.handle.net/10985/18738 en application/pdf info:eu-repo/semantics/openAccess Wiley & Sons http://hdl.handle.net/10985/18738 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/174802025-10-31T01:47:29Zcom_10985_13596col_10985_190

Explicit dynamic analysis of sheet metal forming processes using linear prismatic and hexahedral solid‒shell elements WANG, Peng CHALAL, Hocine ABED-MERAIM, Farid Finite element Solid‒shell concept Explicit dynamic analysis Anisotropic elasto-plasticity Impact problems Sheet metal forming Sciences de l'ingénieur: Mécanique: Mécanique des solides Sciences de l'ingénieur: Mécanique: Mécanique des structures 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. 2017 Article dans une revue avec comité de lecture 0264-4401 http://hdl.handle.net/10985/17480 10.1108/EC-04-2016-0150 en application/pdf info:eu-repo/semantics/openAccess Emerald http://hdl.handle.net/10985/17480 Engineering Computations Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/186592025-10-31T02:00:05Zcom_10985_13596col_10985_192

Foot-flat Period Estimation During Daily Living Situations of Asymptomatic and Lower Limb Amputee Subjects DAURIAC, Boris BONNET, Xavier VILLA, Coralie LAVASTE, François PILLET, Helene Gait amputation prosthetic foot slope temporal parameter Sciences du vivant Walking in various situations is a challenging task for people with a lower limb amputation. Walking upslope and downslope requires a larger ankle range of motion than waking on a level ground. Most of prosthetic feet do not include an ankle joint. The ankle mobility is obtained via the deformation of a composite structure or via rub- bers. The range of motion of the “ankle-foot” component is directly linked to the stiffness of the structure and to the load applied on the prosthesis. In ramps, prosthetic “ankle-feet” present a lack of dorsiflexion when going up and a lack of plantar flexion when going down (Williams et al. 2009). A decreased “ankle-foot” range of motion results in a reduced foot-flat period (FFP) which can induce insta- bility. New systems were proposed to allow ankle-foot prostheses to adapt to slopes (Sup et al. 2009; Williams et al. 2009; Fradet et al. 2010). Foot flat evaluation during different situations within the asymptomatic population could help to define a tar- get for prosthetic design. This parameter could also be a very interesting tool for orthoprosthesist to give a feed- back of the fitting of the prosthesis to the patient (Agrawal et al. 2009). A good adaptation of the prosthetic foot to the ground should result in a longer FFP and traduce the security of the subject on its prosthesis during stance phase. In the same way, a correct toe clearance during the swing phase will correspond to a contralateral side FFP close to normal. Actually, amputee people often demon- strate vaulting during swing phase showing their fear to stumble and fall. The evaluation of this parameter is all the more interesting for comparison purpose as it is not well taken into account during nowadays prosthesis design (Williams et al. 2009). Besides, FFP can be determined from on board measurements (Mariani et al. 2013) in real life conditions. However, for the moment, there are no reference data of FFP available in the literature. his work was supported by the French National Research Agency [grant number ANR-292 2010-TECS-020]. 2015 Article dans une revue avec comité de lecture 1025-5842 http://hdl.handle.net/10985/18659 10.1080/10255842.2015.1072415 1476-8259 en application/pdf info:eu-repo/semantics/openAccess Taylor & Francis http://hdl.handle.net/10985/18659 Computer Methods in Biomechanics and Biomedical Engineering Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/121402025-11-06T07:45:32Zcom_10985_13596col_10985_190

Constitutive modeling of shape memory alloys incorporating transformation-induced plasticity and damage CHATZIGEORGIOU, George CHENG, Long CHEMISKY, Yves MERAGHNI, Fodil Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Sciences de l'ingénieur: Mécanique: Mécanique des solides 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. 2017 Conférence invitée http://hdl.handle.net/10985/12140 en application/pdf info:eu-repo/semantics/openAccess Scheven Malte von; Keip Marc-André; Karajan Nils http://hdl.handle.net/10985/12140 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/221572025-10-31T02:05:18Zcom_10985_13596col_10985_177

Deep Learning for Additive Manufacturing-driven Topology Optimization ALMASRI, Waad BETTEBGHOR, Dimitri ADJED, Faouzi ABABSA, Fakhreddine DANGLADE, Florence Topology Optimization Additive Manufacturing Generative Design Deep Learning Informatique: Intelligence artificielle Sciences de l'ingénieur: Génie des procédés Mathématique: Topologie géométrique This paper investigates the potential of Deep Learning (DL) for data-driven topology optimization (TO). Unlike the rest of the literature that mainly applies DL to TO from a mechanical perspective, we developed an original approach to integrate mechanical and geometrical constraints simultaneously. Our approach takes as input the mechanical constraints (Boundary conditions, loads configuration, volume fraction) alongside the geometrical ones (total number of elements, minimum overhang, maximum length, minimum thickness) and generates a 2D design complying with these constraints. Thus, it combines the best of both mechanical (CAE) and geometrical design worlds. Conversely, geometrical design constraints are complex, not yet formalized, and contradictory between Additive Manufacturing (AM) processes, applications, and materials. Some are even descriptive, lacking a well-defined mathematical description, or are well-defined but proprietary and inaccessible. Hence, despite the synergy between AM and TO, integrating AM constraints into the TO formulation is still a hurdle. Furthermore, even when their integration is possible, TO’s convergence to a solution is compromised. On the other hand, DL has proven robust in capturing geometrical and spatial correlations. Consequently, our approach solves the previously listed setbacks by aligning DL to serve Design for AM (DfAM); there is no need to identify an analytical formula for a geometrical constraint but simply a sufficient number of examples describing it, and convergence is no longer a blockade when the DL model is trained on converged designs. Our approach tailors the design’s geometrical aspects with great flexibility and creativity. It reconciles design and manufacturing and accelerates the design life cycle of a part. Moreover, it can be easily updated to include additional constraints and can be implemented in the future into CAD software as a lighter and faster generative design module. 2022-06-21 Article dans une revue avec comité de lecture 2212-8271 http://hdl.handle.net/10985/22157 10.1016/j.procir.2022.05.317 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/22157 Procedia CIRP Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/213202025-11-18T09:25:40Zcom_10985_13596col_10985_192col_10985_13598

Digital twinning of Cellular Capsule Technology: Emerging outcomes from the perspective of porous media mechanics URCUN, Stéphane SKALLI, Wafa NASSOY, Pierre BORDAS, Stéphane Pierre Alain SCIUMÈ, Giuseppe ROHAN, Pierre-Yves Multidisciplinary Sciences de l'ingénieur: Mécanique: Biomécanique Spheroids encapsulated within alginate capsules are emerging as suitable in vitro tools to investigate the impact of mechanical forces on tumor growth since the internal tumor pressure can be retrieved from the deformation of the capsule. Here we focus on the particular case of Cellular Capsule Technology (CCT). We show in this contribution that a modeling approach accounting for the triphasic nature of the spheroid (extracellular matrix, tumor cells and interstitial fluid) offers a new perspective of analysis revealing that the pressure retrieved experimentally cannot be interpreted as a direct picture of the pressure sustained by the tumor cells and, as such, cannot therefore be used to quantify the critical pressure which induces stress-induced phenotype switch in tumor cells. The proposed multiphase reactive poro-mechanical model was cross-validated. Parameter sensitivity analyses on the digital twin revealed that the main parameters determining the encapsulated growth configuration are different from those driving growth in free condition, confirming that radically different phenomena are at play. Results reported in this contribution support the idea that multiphase reactive poro-mechanics is an exceptional theoretical framework to attain an in-depth understanding of CCT experiments, to confirm their hypotheses and to further improve their design. 2021 Article dans une revue avec comité de lecture 1932-6203 http://hdl.handle.net/10985/21320 10.1371/journal.pone.0254512 en application/pdf info:eu-repo/semantics/openAccess Public Library of Science (PLoS) http://hdl.handle.net/10985/21320 PLOS ONE Institut de Biomécanique Humaine Georges Charpak (IBHGC) Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/82992025-11-06T07:55:37Zcom_10985_13596col_10985_13598

Évaluation de la dispersion des propriétés mécaniques d’un matériau composite par sous-échantillonnage PINEAU, Pierre DAU, Frédéric sous-échantillonnage variabilité propriétés élastiques homogénéisation approches multi-échelles Sciences de l'ingénieur: Mécanique: Mécanique des matériaux This article presents a subsampling and homogenization technique developed to depict behaviour variability at mesoscopic scale in composite materials. This variability is intended to feed multiscale modelling at mesoscale. The technique presented here is meant to characterize the transverse behaviour of unidirectional plies in a stratified Polymer Matrix Composite. A Finite Element Method simulation is performed at microscopic scale considering the heterogeneous media, the mesh being constructed from a transverse micrograph. A part of the ply entitled the sample and supposed to be representative of the material is studied under plane strain hypothesis. A unique loading simulation, reduced to three basic load cases, is applied. Subsamples taken into the simulation cell are homogenized at post-processing level of strain and stress fields. A standard mechanics approach was considered. Various subsampling schemes are performed with various size and spatial distribution to generate statistical distributions of effective elastic properties. Some statistical aspects are highlighted and discussed. 2011 Communication sans acte http://hdl.handle.net/10985/8299 fr application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/8299 Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/200192025-10-31T02:09:48Zcom_10985_13596col_10985_177

Lot-Sizing and Scheduling for the Plastic Injection Molding Industry - A Hybrid Optimization Approach PORTO, Leonardo SILVA, Cristóvão ABDELJAOUAD, Mohamed Amine KLEMENT, Nathalie Heuristic Metaheuristics Scheduling Injection molding Sciences de l'ingénieur The management of industrial systems is done through different levels, ranging from strategic (designing the system), to tactical (planning the activities and assigning the resources) and operational (scheduling the activities). In this paper, we focus on the latter level by considering a real-world scheduling problem from a plastic injection company, where the production process combines parallel machines and a set of resources. We present a scheduling algorithm that combines a metaheuristic and a list algorithm. Two metaheuristics are tested and compared when used in the proposed scheduling approach: the stochastic descent and the simulated annealing. The method’s performances are analyzed through an experimental study and the obtained results show that its outcomes outperform those of the scheduling policy conducted in a case-study company. Moreover, besides being able to solve large real-world problems in a reasonable amount of time, the proposed approach has a structure that makes it flexible and easily adaptable to several different planning and scheduling problems. Indeed, since it is composed by a reusable generic part, the metaheuristic, it is only required to develop a list algorithm adapted to the objective function and constraints of the new problem to be solved. FEDER Hauts de France and CEA Tech 2021 Article dans une revue avec comité de lecture 2076-3417 http://hdl.handle.net/10985/20019 10.3390/app11031202 en application/pdf info:eu-repo/semantics/openAccess MDPI http://hdl.handle.net/10985/20019 Applied Sciences Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/94922025-10-31T01:09:57Zcom_10985_13596col_10985_182

Uncertainty propagation of iron loss from characterization measurements to computation of electrical machines BELAHCEN, Anouar RASILO, Paavo NGUYEN, Thu Trang CLENET, Stephane Uncertainty quantification Iron losses Electrical machines Sciences de l'ingénieur: Energie électrique The aim of the research is to find out how uncertainties in the characterization of magnetic materials propagate through identification and numerical simulation to the computation of iron losses in electrical machines. Design/methodology/approach The probabilistic uncertainties in the iron losses are modelled with the spectral approach using chaos polynomials. The Sobol indices are used for the global sensitivity analysis. The machine is modelled with a 2D finite element method and the iron losses are computed with a previously developed accurate method. Findings The uncertainties propagate in different ways to the different components of losses, i.e. eddy current, hysteresis, and excess losses. The propagation is also different depending on the investigated region of the machine, i.e. Stator or rotor teeth, yokes, tooth tips. Research limitations/implications The method does not account for uncertainties related to the manufacturing process, which might result in even larger variability. Practical implications A major implication of the findings is that the identification of iron loss parameters at low frequencies does not affect the loss variability. The identification with high frequency measurement is very important for the rotor tooth tips. The variability in the excess loss parameters is of low impact. Originality/value The presented results are of importance for the magnetic material manufacturers and the electrical machine designers. The manufacturers can plan the measurement and identification procedures as to minimize the output variability of the parameters. The designers of the machine can use the result and the presented procedures to estimate the variability of their design 2015 Article dans une revue avec comité de lecture 0332-1649 http://hdl.handle.net/10985/9492 10.1108/COMPEL-10-2014-0271 en application/pdf info:eu-repo/semantics/openAccess Emerald http://hdl.handle.net/10985/9492 COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille

oai:sam.ensam.eu:10985/183392025-10-31T01:59:57Zcom_10985_13596col_10985_192

Scapholunate kinematics after flexible anchor repair LOISEL, François DURAND, Stan PERSOHN, Sylvain AUBRY, Sébastien LEPAGE, Daniel BONNET, Xavier SKALLI, Wafa Biplane X-ray Flexible anchors Kinematics Scapholunate ligament Sciences du vivant The scapholunate joint is one of the keystones of the wrist kinematics, and its study is difficult due to the carpal bones size and the richness of surrounding ligaments. We propose a new method of quantitative assessment of scapholunate kinematics through bone motion tracking in order to investigate scapholunate ligament lesion as well as repair techniques. On 6 intact wrists, steel beads were inserted into the bones of interest to track their motions. Experimental set up allowed wrist flexion extension and radio-ulnar deviation motions. Low-dose bi-planar radiographs were performed each 10° of movement for different configurations: 1) intact wrist, 2) scapholunate ligament division, 3) repair by soft anchors at the posterior then 4) anterior part. Beads' 3D coordinates were computed at each position from biplanar X-Rays, allowing accurate registration of each wrist bone. The Monte Carlo sensitivity study showed accuracy between 0.2° and 1.6 ° for the scaphoid and the lunate in motions studied. The maximum flexion-extension range of motion of the scaphoid significantly decreased after anterior repair from 73° in injured wrist to 62.7°. The proposed protocol appears robust, and the tracking allowed to quantify the anchor's influence on the wrist kinematics. ZimmerBiomet, Biomecam Chair program on subject specific musculoskeletal modelling. 2020 Article dans une revue avec comité de lecture 1350-4533 http://hdl.handle.net/10985/18339 10.1016/j.medengphy.2019.11.001 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/18339 Medical Engineering and Physics Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/107872025-11-26T01:07:52Zcom_10985_13596col_10985_6566

Relation entre l'entropie physique le codage de l'information et l'énergie de simulation Relationship between physical entropy, coding of information and energy simulation BIGERELLE, Maxence IOST, Alain Théorie de l'information Algorithmes de compression RLE Huffman Information theory compression algorithms Mathématique: Théorie de l'information et codage Dans cette note, nous analysons l’entropie de mélange d’un système physique à l’équilibre par la théorie algorithmique de l’information. Nous montrons l’existence d’un isomorphisme entre cette entropie et la taille du programme informatique qui simule ce système physique. Cet isomorphisme doit être construit en respectant certaines règles, et le meilleur résultat est obtenu en combinant les algorithmes de compression RLE « run length encoding » et Huffman. Si le système physique est codé par la composition de ces deux isomorphismes basés sur le dénombrement des séquences identiques puis de leur codage en dictionnaire, nous pouvons quantifier l’entropie de systèmes binaires ou ternaires à l’état d’équilibre. De plus, il existe une relation affine entre l’énergie de simulation du système physique et l’énergie libre du système. It is shown that an isomorphism exists between the mixing entropy and the size of a computer program that simulates the physical system. This isomorphism must be constructed with respect to some theorems, and it is shown that the composition of two isomorphisms, one based on a run length encoding and another by encoding sequences in a dictionary allows us to quantify the entropy of binary and ternary systems at the equilibrium. Finally, it is shown that the energy consumed by a physical system encoded by this system and executed on a Turing machine is proportional to the free energy of the thermodynamic system. 2007 Article dans une revue avec comité de lecture 0008-4204 http://hdl.handle.net/10985/10787 10.1139/P07-136 1208-6045 fr application/pdf info:eu-repo/semantics/openAccess NRC Research Press http://hdl.handle.net/10985/10787 Canadian Journal of Physics Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/69562025-11-06T07:57:04Zcom_10985_13596col_10985_182

Vectorial Approach Based Control of a Seven-Phase Axial Flux Machine Designed for Fault Operation LOCMENT, Fabrice SEMAIL, Eric KESTELYN, Xavier fault diagnosis machine vector control permanent magnet machines fault operation permanent magnet machine seven-leg voltage source inverter seven-phase axial flux machine Fault tolerance multiphase synchronous machine reliability torque ripple Sciences de l'ingénieur: Automatique / Robotique Sciences de l'ingénieur: Energie électrique Version éditeur disponible à l'adresse suivante : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4519973&isnumber=4636792 This paper deals with easy-to-implement control strategies when a seven-phase axial flux permanent magnet machine supplied by a seven-leg voltage source inverter is in fault operation mode. Using a vectorial multimachine description, a seven-phase machine presenting a heightened ability to be controlled with one or two open-circuited phases has been designed. The machine is first presented, and experimental results are provided when one or two phases are open circuited. Based on a vectorial approach, new current references are calculated to avoid high-torque ripples. 2008 Article dans une revue avec comité de lecture 0278-0046 http://hdl.handle.net/10985/6956 10.1109/TIE.2008.925313 en_US application/pdf info:eu-repo/semantics/openAccess Institute of Electrical and Electronics Engineers http://hdl.handle.net/10985/6956 IEEE Transactions on Industrial Electronics Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille

oai:sam.ensam.eu:10985/200202025-10-31T02:08:21Zcom_10985_13596col_10985_182col_10985_6566

Experimental set up for magnetomechanical measurements with a closed flux path sample EL YOUSSEF, Mohamad VAN GORP, Adrien BENABOU, Abdelkader FAVEROLLE, Pierre MIPO, Jean-Claude CLENET, Stephane Non-oriented FeSi steel Magnetic characterization Tensile stress Plastic strain Sciences de l'ingénieur In this article, an experimental procedure is presented to handle magnetic measurements under uniaxial tensile stress reaching the plastic domain. The main advantage of the proposed procedure is that it does not require an additional magnetic core to close the magnetic flux path through the studied sample. The flux flows only in the sample, and no parasitic air gaps are introduced, thus avoiding the use of the H-coil to evaluate the magnetic field, which is often very sensitive and not easy to calibrate. A specimen of nonoriented FeSi (1.3%) sheet (M330-35A) is characterized under uniaxial tensile stress. To validate the proposed procedure, a comparison with the single sheet tester procedure is carried out. The results obtained by the two procedures are in good agreement. Moreover, to illustrate the possibilities offered by the proposed procedure, we confirm some results obtained in the literature. We show that the positive plastic strain leads to a significant degradation of magnetic behavior. An applied tensile stress on a virgin (unstrained) sample leads to a degradation of the magnetic behavior. However, on a pre-strained sample, an applied tensile stress results in reducing the deterioration caused by the plastic strain until a stress value called optimum is attained. Above this threshold, the magnetic behavior re-deteriorates progressively. 2020 Article dans une revue avec comité de lecture 2391-5471 http://hdl.handle.net/10985/20020 10.1515/phys-2020-0160 en application/pdf info:eu-repo/semantics/openAccess De Gruyter http://hdl.handle.net/10985/20020 Open Physics Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/77192025-10-31T01:06:47Zcom_10985_13596col_10985_190col_10985_179

Determination of quantity and localization of liquid in the semi-solid state using both 3D X-ray microtomography and 2D techniques for steel thixoforming GU, Guochao BECKER, Eric PESCI, Raphaël LANGLOIS, Laurent Semi-solid Steel Thixoforging X-ray microtomography SEM-EDS Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Lien vers la version éditeur: http://www.scientific.net/SSP.192-193.191 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. 2013 Article dans une revue avec comité de lecture 0377-6883 http://hdl.handle.net/10985/7719 10.4028/www.scientific.net/SSP.192-193.191 en application/pdf info:eu-repo/semantics/openAccess Trans Tech Publications Ltd http://hdl.handle.net/10985/7719 Solid State Phenomena Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3) Laboratoire de Conception Fabrication Commande (LCFC)

oai:sam.ensam.eu:10985/212992025-10-31T02:04:25Zcom_10985_13596col_10985_192

Assessment of the axial plane deformity in subjects with adolescent idiopathic scoliosis and its relationship to the frontal and sagittal planes KARAM, Mohamad VERGARI, Claudio SKALLI, Wafa BIZDIKIAN, Aren Joe MEHANNA, Joe KAWKABANI, Georges KHARRAT, Khalil GHANEM, Ismat ASSI, Ayman Orthopedics and Sports Medicine Sciences du vivant Purpose Investigate the axial plane deformity in the scoliotic segment and its relationship to the deformity in the frontal and sagittal planes. Methods Two hundred subjects with AIS (Cobb ≥ 20°) underwent low dose biplanar X-rays with 3D reconstruction of the spine and pelvis. All structural curves were considered and were distributed as follows: 142 thoracic (T), 70 thoracolumbar (TL), and 47 lumbar curves (L). Common 3D spino-pelvic and scoliosis parameters were collected such as: frontal Cobb; torsion index (TI); hypokyphosis/lordosis index (HI). Parameters were compared between each type of curvature and correlations were investigated between the 3 planes. Results Frontal Cobb was higher in all T (45 ± 19°) and TL (41 ± 15°) curves compared to L curves (35 ± 14°, p = 0.004). TI was higher in T curves when compared to TL and L curves (TI: 15 ± 8°, 9 ± 6°, 7 ± 5°, p < 0.001). HI was similar between curve types. T curves showed significant correlations between the 3 planes: Cobb vs. TI (r = 0.76), Cobb vs. HI (r = − 0.54) and HI vs. TI (r = − 0.42). The axial plane deformity was related to the frontal deformity and the type of curvature (adjusted-R2 = 0.6). Conclusion Beside showing the most severe deformity frontally and axially compared to TL and L curves, the T curves showed strong correlations between the 3 planes of the deformity. Moreover, this study showed that the axial plane deformity cannot be fully determined by the frontal and sagittal deformities, which highlights the importance of 3D assessment in the setting of AIS. 2021 Article dans une revue avec comité de lecture 2212-134X 2212-1358 http://hdl.handle.net/10985/21299 10.1007/s43390-021-00443-y en application/pdf info:eu-repo/semantics/openAccess Springer Science and Business Media LLC http://hdl.handle.net/10985/21299 Spine Deformity Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/95582025-11-06T07:45:54Zcom_10985_13596col_10985_182

Model-Order Reduction of Magnetoquasi-Static Problems Based on POD and Arnoldi-Based Krylov Methods PIERQUIN, Antoine HENNERON, Thomas BRISSET, Stéphane CLENET, Stephane Krylov subspace model-order reduction proper orthogonal decomposition quasi-static problem Frequency-domain analysis Sciences de l'ingénieur: Energie électrique The proper orthogonal decomposition method and Arnoldi-based Krylov projection method are investigated in order to reduce a finite-element model of a quasi-static problem. Both methods are compared on an academic example in terms of computation time and precision. 2015 Communication avec acte 0018-9464 http://hdl.handle.net/10985/9558 10.1109/TMAG.2014.2358374 en application/pdf info:eu-repo/semantics/openAccess IEEE http://hdl.handle.net/10985/9558 Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille

oai:sam.ensam.eu:10985/96982025-11-06T08:02:04Zcom_10985_13596col_10985_6566

On the detection of corrosion pit interactions using two-dimensional spectral analysis JARRAH, Adil NIANGA, Jean-Marie IOST, Alain GUILLEMOT, Gildas NAJJAR, Denis Pitting corrosion Spatial patterns Spectral analysis Pits interaction Gumbel’s method Chimie: Matériaux Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Mécanique des matériaux A particular thanks to Professor Maxence Bigerelle (UTC, Compiègne, France) and to research and development engineer Dr. Benjamin Fournier (CEA, Saclay, France) for their interesting discussions and useful advices about the scientific problem of pitting corrosion. A statistical methodology for detecting pits interactions based on a two-dimensional spectral analysis is presented. This method can be used as a tool for the exploratory analysis of spatial point patterns and can be advanced as an alternative of classical methods based on distance. One of the major advantages of the spectral analysis approach over the use of classical methods is its ability to reveal more details about the spatial structure like the scale for which pits corrosion can be considered as independent. Furthermore, directional components of pattern can be investigated. The method is validated in a first time using numerical simulations on random, regular and aggregated structures. The density of pits, used in the numerical simulations, corresponds to that assessed from a corroded aluminium sheet. In a second time, this method is applied to verify the independence of the corrosion pits observed on the aforementioned aluminium sheet before applying the Gumbel theory to determine the maximum pit depth. Indeed, the property of independence is a prerequisite of the Gumbel theory which is one of the most frequently used in the field of safety and reliability. 2010 Article dans une revue avec comité de lecture 0010-938X http://hdl.handle.net/10985/9698 10.1016/j.corsci.2009.09.011 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/9698 Corrosion Science Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/153212025-12-01T13:56:03Zcom_10985_13596col_10985_184

Sensitivity of Supersonic ORC Turbine Injector Designs to Fluctuating Operating Conditions BUFI, Elio Antonio CINNELLA, Paola MERLE, Xavier CINNELLA, Paola Pressure. Density Absolute temperature. Sciences de l'ingénieur The design of an efficient organic rankine cycle (ORC) expander needs to take properly into account strong real gas effects that may occur in given ranges of operating conditions, which can also be highly variable. In this work, we first design ORC turbine geometries by means of a fast 2-D design procedure based on the method of characteristics (MOC) for supersonic nozzles characterized by strong real gas effects. Thanks to a geometric post-processing procedure, the resulting nozzle shape is then adapted to generate an axial ORC blade vane geometry. Subsequently, the impact of uncertain operating conditions on turbine design is investigated by coupling the MOC algorithm with a Probabilistic Collocation Method (PCM) algorithm. Besides, the injector geometry generated at nominal operating conditions is simulated by means of an in-house CFD solver. The code is coupled to the PCM algorithm and a performance sensitivity analysis, in terms of adiabatic efficiency and power output, to variations of the operating conditions is carried out. 2015 Communication avec acte 9780791856642 http://hdl.handle.net/10985/15321 10.1115/GT2015-42193 en application/pdf info:eu-repo/semantics/openAccess ASME http://hdl.handle.net/10985/15321 Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/132352025-10-31T01:38:57Zcom_10985_13596col_10985_13598

Modelling of corrosion fatigue crack initiation on martensitic stainless steel in high cycle fatigue regime EL MAY, Mohamed SAINTIER, Nicolas PALIN-LUC, Thierry DEVOS, Olivier BRUCELLE, Olivier Stainless steel Corrosion fatigue Pitting corrosion Modelling Chimie: Matériaux Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux This paper presents an analytical model for assessing the corrosion fatigue crack initiation life on a martensitic stainless steel X12CrNiMoV12-3 in high cycle fatigue regime (between 105 and 107 cycles). Based on in-situ electrochemical measurements during corrosion fatigue tests in NaCl aqueous solution, the corrosion fatigue crack initiation mechanism was identified. Two main stages were investigated: (i) the fracture of the passive film by slip bands and (ii) the free dissolution of the metal developing fatigue crack initiation from a critical corrosion defect. The depassivation stress threshold corresponds to the median fatigue strength at 107 cycles for fatigue corrosion tests. For an applied stress range less than this threshold, the depassivation phenomenon was not observed at 107 cycles and no crack initiation occurred. The proposed model takes into account the depassivation process induced by the slip bands emergence at the specimen surface and the corrosion rate under cyclic loading. The experimental results are compared to the proposed model taking into account mechanical and electrochemical material parameters. 2018 Article dans une revue avec comité de lecture 0010-938X http://hdl.handle.net/10985/13235 10.1016/j.corsci.2018.01.034 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/13235 Corrosion Science Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/174632025-10-31T01:50:55Zcom_10985_13596col_10985_190

Numerical investigation of necking in perforated sheets using the periodic homogenization approach ZHU, Jianchang BEN BETTAIEB, Mohamed ABED-MERAIM, Farid Perforated sheets Periodic homogenization Diffuse and localized necking Bifurcation analysis Sensitivity study Sciences de l'ingénieur Sciences de l'ingénieur: Matériaux Due to their attractive properties, perforated sheets are increasingly used in a number of industrial applications, such as automotive, architecture, pollution control, etc. Consequently, the accurate modeling of the mechanical behavior of this kind of sheets still remains a valuable goal to reach. This paper aims to contribute to this effort by developing reliable numerical tools capable of predicting the occurrence of necking in perforated sheets. These tools are based on the coupling between the periodic homogenization technique and three plastic instability criteria. The periodic homogenization technique is used to derive equivalent macroscopic mechanical behavior for a representative volume element of these sheets. On the other hand, the prediction of plastic instability is based on three necking criteria: the maximum force criterion (diffuse necking), the general bifurcation criterion (diffuse necking), and the loss of ellipticity criterion (localized necking). The predictions obtained by applying the three instability criteria are thoroughly analyzed and compared. A sensitivity study is also conducted to numerically investigate the influence on the prediction of necking of the design parameters (dimension, aspect-ratio, orientation, and shape of the holes), the macroscopic boundary conditions and the metal matrix material parameters (plastic anisotropy, hardening). 2020 Article dans une revue avec comité de lecture 0020-7403 http://hdl.handle.net/10985/17463 10.1016/j.ijmecsci.2019.105209 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/17463 International Journal of Mechanical Sciences Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/258632025-10-31T02:23:16Zcom_10985_13596col_10985_189

Exploring the effect of layer thickness on the elastoplastic properties of the constituent materials of CrN/CrAlN multilayer coatings: a nanoindentation and finite element-based investigation AMMAR, Yamen Ben AOUADI, Khalil BESNARD, Aurélien MONTAGNE, Alex NOUVEAU, Corinne BOUCHOUCHA, Faker Instrumented-indentation testing Multilayer coatings Composite hardness modeling Elasto-plastic properties Inverse finite element material modelling Sciences de l'ingénieur: Mécanique: Mécanique des matériaux This paper aims to assess the effect of layer thickness on the elastoplastic properties of the constituent materials of multilayer coating systems, as well as on the stress and strain fields in the vicinity of the coating/substrate interface. A methodology based on a trust-region reflective optimization algorithm, integrated with finite element analysis of the nanoindentation process, is employed to extract the elastoplastic properties of the distinct layers, constituting multilayer coating. This approach is validated on a CrN/CrAlN multilayer coating systems with varying layer thicknesses from 1 to 0.35 µm, by which Young's modulus (E), yield stress (σy), and work hardening exponent (n) of each individual coating material layer were obtained. The results revealed a reduction in the hardness and Young's modulus of either CrN, or CrAlN coating layer as the layer thickness decreased. Finite element analysis of the nanoindentation process demonstrated that decreasing the coating layer thickness leads to an increase in the plastic deformation within the coatings, which reduces the stress concentration in this area. The simulation results suggest that an optimum thickness of 0.5 μm of CrAlN and CrN monolayer materials would improve the adhesion properties of CrN/CrAlN multilayer coatings. 2024-11-15 Article dans une revue avec comité de lecture 0040-6090 http://hdl.handle.net/10985/25863 10.1016/j.tsf.2024.140581 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/25863 Thin Solid Films Laboratoire des Matériaux et Procédés (LaBoMaP)

oai:sam.ensam.eu:10985/103552025-10-31T01:10:31Zcom_10985_13596col_10985_190

Modélisation Elasto-Viscoplastique du Comportement des Aciers PIPARD, Jean-Marc ABED-MERAIM, Farid BALAN, Tudor BERVEILLER, Marcel BOUAZIZ, Olivier LEMOINE, Xavier Elasto-viscoplasticité Aciers Multiphasés Loi de Comportement Sinus hyperbolique Elasto-viscoplasticity Multiphase steels Sciences de l'ingénieur: Génie des procédés Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Génie mécanique Sciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Sciences de l'ingénieur: Mécanique: Mécanique des solides Sciences de l'ingénieur: Mécanique: Mécanique des structures Sciences de l'ingénieur: Micro et nanotechnologies/Microélectronique Dans cet article, une modélisation des différentes phases (ferrite, perlite etc.…) d’un acier multiphasé est proposée moyennant une loi phénoménologique à base physique. La description unifiée du comportement viscoplastique peut être décrite à partir de lois de type sinus hyperbolique. Dans cette optique, une loi en sinus hyperbolique est utilisée afin de décrire de façon physiquement acceptable l’ensemble des comportements asymptotiques du comportement viscoplastique. L’écrouissage de chacune des phases est de type combiné (isotrope et cinématique) incluant l’effet de vitesse de déformation propre au comportement visqueux. A partir d’un modèle de comportement monotone unidimensionnel d’inspiration métallurgique, nous développons une formulation tridimensionnelle incrémentale, en déterminant l’expression du potentiel dont découlent les lois de comportement correspondantes. La capacité du modèle ainsi obtenu à décrire le comportement élasto-viscoplastique d’une phase est testée au travers de simulations de tests rhéologiques décrivant différents chemins de déformation à différentes vitesses de déformation. Une discussion basée sur la comparaison de ces simulations avec des résultats expérimentaux sur un acier 100% ferritique est présentée. In this work, an elastic-viscoplastic behaviour modelling of multi-phase steels at large strain-rates is presented. For each phase (ferrrite, perlite etc…), an advanced physically based viscoplastic constitutive model is adopted. Viscoplastic behaviour can be described by hyperbolic sine function. A new physically based constitutive law suitable to capture all the main features of viscoplasticity is used. In this study, the model has been extended to three dimensional framework in view of numerical implementation in a finite element code. The ability of this modelling framework to describe the behaviour of steels at high strain-rates is explored by means of simulations of rheological tests at various strain-rates and involving different strain paths. The model is applied to a 100% polycrystalline ferritic steel. Numerical results in terms of strain rate sensitivity and Bauschinger effect are discussed and compared with experimental ones. ArcelorMittal & Région Lorraine 2007 Communication avec acte http://hdl.handle.net/10985/10355 fr application/pdf info:eu-repo/semantics/openAccess Association Française de Mécanique http://hdl.handle.net/10985/10355 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/154172025-10-31T01:44:37Zcom_10985_13596col_10985_191

Sensitivity thermal analysis in the laser-assisted tape placement process PEREZ, Marta BARASINSKI, Anaïs COURTEMANCHE, Benoît GHNATIOS, Chady CHINESTA SORIA, Francisco :composites; automated tape placement; thermal modeling; Proper Generalized Decomposition; statistics analysis; uncertainty propagation Sciences de l'ingénieur Nowadays, the production of large pieces made of thermoplastic composites is an industrial challenging issue as there are yet several difficulties associated to their processing. The laserassisted tape placement (LATP) process is an automated manufacturing technique to produce long-fiber reinforced thermoplastic matrix composites. In this process, a tape is placed and progressively welded on the substrate. The main aim of the present work is to solve an almost state of the art thermal model by using an efficient numerical technique, the so-called Proper Generalized Decomposition (PGD) that considers parameters (geometrical and material) as model extra-coordinates. Within the PGD rationale the parametric temperature field is expressed in a separated form, as a finite sum of functional products, where each term depends on a single coordinate (space, time or each one of the parameters considered as extra-coordinates). Such a separated representation allows the explicit expression of the sensitivity fields, from the temperature derivative with respect to each parameter. These sensitivity fields represent a very valuable methodology to analyze and establish the influence of the critical input parameters on the thermal response, and therefore, for performing process optimization and control, as well as for evaluating the effect of parameters variability on the thermal response. 2018 Article dans une revue avec comité de lecture 2372-0484 http://hdl.handle.net/10985/15417 10.3934/matersci.2018.6.1053 en application/pdf info:eu-repo/semantics/openAccess AIMS Press http://hdl.handle.net/10985/15417 AIMS Materials Science Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/192692025-10-31T01:58:02Zcom_10985_13596col_10985_13598

Multi-scale optimisation of thin-walled structures by considering a global/local modelling approach IZZI, Michele Iacopo MONTEMURRO, Marco CATAPANO, Anita FANTERIA, Daniele PAILHES, Jerome Mathématique: Optimisation et contrôle Sciences de l'ingénieur: Mécanique: Mécanique des structures Sciences de l'ingénieur: Mécanique: Mécanique des solides In this work, a design strategy for optimising thin-walled structures based on a global-local finite element (FE) modelling approach is presented. The preliminary design of thin-walled structures can be stated in the form of a constrained non-linear programming problem (CNLPP) involving requirements of different nature intervening at the different scales of the structure. The proposed multi-scale optimisation (MSO) strategy is characterised by two main features. Firstly, the CNLPP is formulated in the most general sense by including all design variables involved at each pertinent scale of the problem. Secondly, two scales (with the related design requirements) are considered: i) the structure macroscopic scale, where low-fidelity FE models are used; ii) the structure mesoscopic scale (or component-level), where more accurate FE models are involved. In particular, the mechanical responses of the structure are evaluated at both global and local scales, avoiding the use of approximated analytical methods. The MSO is here applied to the least-weight design of an aluminium fuselage barrel of a wide-body aircraft. Fully parametric global and local FE models are interfaced with an in-house metaheuristic algorithm. Refined local FE models are created only for critical regions of the structure, automatically detected during the global analysis, and linked to the global one thanks to the implementation of a sub-modelling approach. The whole process is completely automated and, once set, it does not need any further user intervention. This paper presents part of the activities carried out within the research project PARSIFAL (Prandtlplane ARchitecture for the Sustainable Improvement of Future AirpLanes), which has been funded by the European Union under the Horizon 2020 Research and Innovation Program (Grant Agreement n.723149) 2020 Article dans une revue avec comité de lecture 0954-4100 http://hdl.handle.net/10985/19269 10.1177/0954410020939338 2041-3025 en application/pdf info:eu-repo/semantics/openAccess SAGE Publications http://hdl.handle.net/10985/19269 Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/236892026-02-20T01:26:50Zcom_10985_13596col_10985_191

A spatio-temporal nonlinear semi-analytical framework describing longitudinal waves propagation in damaged structures based on Green–Volterra formalism BOUVIER, Damien RÉBILLAT, Marc MONTEIRO, Eric MECHBAL, Nazih Volterra series Lamb waves Structural health monitoring Damage quantification Damage classification Sciences de l'ingénieur: Acoustique Structural Health Monitoring (SHM) of aeronautic structures by means of Lamb waves opens promising perspectives in terms of maintenance costs reduction and safety increases. Lamb waves interactions with damages are known to be nonlinear, a property still largely underexploited in SHM. Difficulties in this context are (i) to be able to distinguish between nonlinearities due to the waves spatial propagation (i.e. material or geometrical nonlinearities) and those located at the damage position, (ii) to handle computational complexity associated with spatio-temporal nonlinear models, and (iii) to be able to physically link recorded signals with actual damage state. This work proposes to rely on the Green–Volterra formalism to build up a semi-analytical spatio-temporal framework describing longitudinal waves propagation and damage interaction able to physically represent both types of nonlinearities, and computationally simple enough to be tractable in real-time for SHM purposes. This approach is detailed here for longitudinal waves, which corresponds in the low frequency thickness range to the Lamb wave mode propagating in a damaged beam. A spatio-temporal semi-analytical model of the nonlinear longitudinal waves propagation is first derived, where the damage is represented by a polynomial stiffness characteristic acting via boundary conditions at a given position in the beam. This model is then used to derive the Green–Volterra series describing the nonlinear input–output relationship of the system. A modal decomposition of the Green–Volterra series is also provided to ease implementation and reduce computational cost. The proposed spatio-temporal semi-analytical approach is then successfully compared to state-of-the-art nonlinear Lamb waves simulation methods based on finite-element models. It is finally shown on a simulated example and discussed in detail how such a nonlinear framework could potentially be relevant for SHM purposes. Projet européen H2020 REMAP 2023-01 Article dans une revue avec comité de lecture http://hdl.handle.net/10985/23689 10.1016/j.ymssp.2022.110048 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/23689 Mechanical Systems and Signal Processing Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/153152025-10-31T01:44:44Zcom_10985_13596col_10985_184

Assessment of time implicit discretizations for the computation of turbulent compressible flows CINNELLA, Paola CEDRIC, Content Sciences de l'ingénieur Restrictions on the maximum allowable time step of explicit time integration methods for direct and large eddy simulations of compressible turbulent flows at high Reynolds numbers can be very severe, because of the extremely small space steps used close to solid walls to capture tiny and elongated boundary layer structures. A way of increasing stability limits is to use implicit time integration schemes. However, the price to pay is a higher computational cost per time step, higher discretization errors and lower parallel scalability. A successful implicit time scheme for scale-resolving simulations should provide the best possible compromise between these opposite requirements. In this paper, several implicit schemes are assessed against two explicit time integration techniques, namely a standard four-stage and a six-stage optimized Runge–Kutta method, in terms of computational cost required to achieve a threshold level of accuracy. Precisely, a second-order backward scheme solved by means of matrix-free quasi-exact Newton subiterations is compared to time-accurate Runge–Kutta implicit residual smoothing (IRS) schemes. A new IRS scheme of fourth-order accuracy, based on a bilaplacian operator, is developed to improve the accuracy of the classical second-order approach. Numerical results show that the proposed IRS scheme leads to reductions in computational time by about a factor 5 for an accuracy comparable to that of the corresponding explicit Runge-Kutta scheme. 2015 Communication avec acte 9781624103667 http://hdl.handle.net/10985/15315 10.2514/6.2015-2754 en application/pdf info:eu-repo/semantics/openAccess American Institute of Aeronautics and Astronautics http://hdl.handle.net/10985/15315 Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/168162025-10-31T01:53:07Zcom_10985_13596col_10985_177

Evaluating Added Value of Augmented Reality to Assist Aeronautical Maintenance Workers - Experimentation on On-Field Use Case LOIZEAU, Quentin ABABSA, Fakhreddine MERIENNE, Frédéric DANGLADE, Florence Augmented Reality Aeronautical Maintenance On-field Evaluation Criteria Use case selection Added value Informatique: Synthèse d'image et réalité virtuelle Augmented Reality (AR) technology facilitates interactions with information and understanding of complex situations. Aeronautical Maintenance combines complexity induced by the variety of products and constraints associated to aeronautic sector and the environment of maintenance. AR tools seem well indicated to solve constraints of productivity and quality on the aeronautical maintenance activities by simplifying data interactions for the workers. However, few evaluations of AR have been done in real processes due to the difficulty of integrating the technology without proper tools for deployment and assessing the results. This paper proposes a method to select suitable criteria for AR evaluation in industrial environment and to deploy AR solutions suited to assist maintenance workers. These are used to set up on-field experiments that demonstrate benefits of AR on process and user point of view for different profiles of workers. Further work will consist on using these elements to extend results to AR evaluation on the whole aeronautical maintenance process. A classification of maintenance activities linked to workers specific needs will lead to prediction of the value that augmented reality would bring to each activity. 2019 Communication avec acte http://hdl.handle.net/10985/16816 en application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/16816 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/116262025-10-31T01:37:48Zcom_10985_13596col_10985_6566

Effet de la température frittage sur le comportement mécanique et tribologique de l’alliage TiNi poreux KAHLOUL, L. CHADLI, H. IOST, Alain HERVAS, Isabel LABAIZ, Mohamed MONTAGNE, Alex Température de frittage Résistance à la corrosion Tribologie Physique: matière Condensée: Science des matériaux La biocompatibilité des implants est une condition indispensable à leurs usages. Elle peut être définie par la compatibilité entre un système technique et un système biologique. On distingue deux types de biocompatibilité, structurale et celle de surface. Elle est caractéristique de l’endommagement provoqué par l’implant sur les tissus. Cet endommagement est lié aux propriétés mécaniques de l’implant et aux produits libérés par le frottement et par la corrosion qui se manifestent à l’interface du biomatériau et des tissus environnants. Ces derniers peuvent être à l’origine de nombreuses irritations. A cet effet l’objectif de ce travail est l’étude de l’effet de la température de frittage sur le comportement mécanique, électrochimique et tribologique de l’alliage TiNi poreux. 2016 Communication sans acte http://hdl.handle.net/10985/11626 fr application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/11626 Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/79862025-10-31T01:25:07Zcom_10985_13596col_10985_191

Dynamic cratering of graphite: Experimental results and simulations HEBERT, David BERTRON, I CHEVALIER, J.M HALLO, L LESCOUTE, Emilien VIDEAU, Laurent COMBIS, Patrick GUILLET, F BERTHE, Laurent SEISSON, G. BOUSTIE, Michel Hypervelocity impact Porous graphite Hydrocode simulation Laser-induced shock Energy partitioning Sciences de l'ingénieur: Mécanique: Mécanique des matériaux The cratering process in brittle materials under hypervelocity impact (HVI) is of major relevance for debris shielding in spacecraft or high-power laser applications. Amongst other materials, carbon is of particular interest since it is widely used as elementary component in composite materials. In this paper we study a porous polycrystalline graphite under HVI and laser impact, both leading to strong debris ejection and cratering. First, we report new experimental data for normal impacts at 4100 and 4200 m s 1 of a 500-mm-diameter steel sphere on a thick sample of graphite. In a second step, dynamic loadings have been performed with a high-power nanosecond laser facility. High-resolution X-ray tomographies and observations with a scanning electron microscope have been performed in order to visualize the crater shape and the subsurface cracks. These two post-mortem diagnostics also provide evidence that, in the case of HVI tests, the fragmented steel sphere was buried into the graphite target below the crater surface. The current study aims to propose an interpretation of the results, including projectile trapping. In spite of their efficiency to capture overall trends in crater size and shape, semi-empirical scaling laws do not usually predict these phenomena. Hence, to offer better insight into the processes leading to this observation, the need for a computational damage model is argued. After discussing energy partitioning in order to identify the dominant physical mechanisms occurring in our experiments, we propose a simple damage model for porous and brittle materials. Compaction and fracture phenomena are included in the model. A failure criterion relying on Weibull theory is used to relate material tensile strength to deformation rate and damage. These constitutive relations have been implemented in an Eulerian hydrocode in order to compute numerical simulations and confront them with experiments. In this paper, we propose a simple fitting procedure of the unknown Weibull parameters based on HVI results. Good agreement is found with experimental observations of crater shapes and dimensions, as well as debris velocity. The projectile inclusion below the crater is also reproduced by the model and a mechanism is proposed for the trapping process. At least two sets of Weibull parameters can be used to match the results. Finally, we show that laser experiment simulations may discriminate in favor of one set of parameters. 2013 Article dans une revue avec comité de lecture 0734-743X http://hdl.handle.net/10985/7986 10.1016/j.ijimpeng.2013.08.001 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/7986 International Journal of Impact Engineering Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/101992025-11-18T09:06:35Zcom_10985_13596col_10985_192

Investigation of 3D glenohumeral displacements from 3D reconstruction using biplane X-ray images: Accuracy and reproducibility of the technique and preliminary analysis in rotator cuff tear patients ZHANG, Cheng SKALLI, Wafa LAGACÉ, Pierre-Yves BILLUART, Fabien OHL, Xavier CRESSON, Thierry BUREAU, Nathalie J. ROULEAU, Dominique M. ROY, André TETREAULT, Patrice SAURET, Christophe DE GUISE, Jacques A. HAGEMEISTER, Nicola Glenohumeral displacement Rotator cuff tears 3D scapula reconstruction Biplane X-rays Sciences du vivant: ingénierie bio-médicale Rotator cuff (RC) tears may be associated with increased glenohumeral instability; however, this instability is difficult to quantify using currently available diagnostic tools. Recently, the three-dimensional (3D) reconstruction and registration method of the scapula and humeral head, based on sequences of low-dose biplane X-ray images, has been proposed for glenohumeral displacement assessment. This research aimed to evaluate the accuracy and reproducibility of this technique and to investigate its potential with a preliminary application comparing RC tear patients and asymptomatic volunteers. Accuracy was assessed using CT scan model registration on biplane X-ray images for five cadaveric shoulder specimens and showed differences ranging from 0.6 to 1.4 mm depending on the direction of interest. Intra- and interobserver reproducibility was assessed through two operators who repeated the reconstruction of five subjects three times, allowing defining 95% confidence interval ranging from ±1.8 to ±3.6 mm. Intraclass correlation coefficient varied between 0.84 and 0.98. Comparison between RC tear patients and asymptomatic volunteers showed differences of glenohumeral displacements, especially in the superoinferior direction when shoulder was abducted at 20 and 45 . This study thus assessed the accuracy of the low-dose 3D biplane X-ray reconstruction technique for glenohumeral displacement assessment and showed potential in biomechanical and clinical research. Fondation Paris-Tech Programme BIOMECAM Chaire ParisTech Institut de Recherche Robert-Sauvé en Santé et Sécurité du Travail du Québec Natural Science and Engineering Research Council of Canada Fonds de Recherche sur la Nature et les Technologies du Québec Fonds de Recherche en Santé du Québec, EOS Imaging, and French pôle de compétitivité MEDICEN (STEREOS + program). 2015 Article dans une revue avec comité de lecture 1050-6411 http://hdl.handle.net/10985/10199 10.1016/j.jelekin.2015.08.002 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/10199 Journal of Electromyography and Kinesiology Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/82552025-11-06T07:58:32Zcom_10985_13596col_10985_13598

Méthode des éléments discrets : des problèmes multi-corps aux problèmes d’endommagement dynamique complexes. ANDRE, Damien CHARLES, Jean-Luc VIOT, Philippe IORDANOFF, Ivan Discrete Element Method mousses fracturation matériaux fragiles Mathématique: Analyse numérique Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Génie mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux La méthode des éléments discrets est présentée comme une alternative aux approches de type mécanique des milieux continus pour aborder certains aspects liés aux problèmes dynamiques, notamment la multi fracturation de matériaux fragiles. Des exemples liés à l’usinage des composites et au surfaçage du verre sont présentés. Une extension de la méthode pour étudier le comportement des mousses est ensuite proposée et imagée par des premiers résultats. 2011 Communication avec acte http://hdl.handle.net/10985/8255 application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/8255 Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/212272025-10-31T01:46:52Zcom_10985_13596col_10985_177

Multi-objective non-weighted optimization to explore new efficient design of electrical microgrids DOUGIER, Nathanael ROUCOULES, Lionel GARAMBOIS, Pierre GOMAND, Julien General Energy decision-support tool microgrid modelling multi-objective optimization energy system simulation genetic algorithm Sciences de l'ingénieur Centralized electrical networks induce a dependency of local territories for their power supply. However, thanks to microgrids, territories can increase their decision-making autonomy to design a network that matches their values. Technological and management choices are critical to minimize microgrids negative impacts on their environment. Influence of the latter on the design space is rarely discussed whereas extending the design space would help to find innovative microgrids. The purpose of this paper is to find several microgrids with various performances and parameters that are compromises between economic, technical and environmental objectives. The solutions’ variety therefore extends the decision-makers’ design space. A tool has been developed to answer this goal. Design parameters are both technological and management parameters. A physical modelling is implemented in a sequential simulation of the microgrid operation. The performance of the simulation allows to use genetic algorithms to perform multi-objective non-weighted optimizations. Two twoobjective optimizations are performed. Results show how the solutions’ diversity in terms of performances and parameters helps the user choosing innovative microgrids. Especially, it underlines the potential of this approach to find microgrids with close performances but different parameters. This work was supported by the Region Provence-Alpes-Côte d’Azur, France 2021 Article dans une revue avec comité de lecture http://hdl.handle.net/10985/21227 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/21227 Applied Energy Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/265082025-12-10T01:41:53Zcom_10985_13596col_10985_190

Evaluation of a new solid-shell finite element on the simulation of sheet metal forming processes CHALAL, Hocine SALAHOUELHADJ, Abdellah ABED-MERAIM, Farid Anisotropic elastic-plastic behavior Large deformations Sheet metal forming Solid-shell element Sciences de l'ingénieur Sciences de l'ingénieur: Mécanique 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. 2012 Article dans une revue avec comité de lecture 978-351400797-0 16113683 http://hdl.handle.net/10985/26508 en application/pdf info:eu-repo/semantics/openAccess Wiley-VCH Verlag http://hdl.handle.net/10985/26508 Steel Research International Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/90952025-11-06T07:49:49Zcom_10985_13596col_10985_179

Forging process control: Influence of key parameters variation on product specifications deviations ALLAM, Zakaria BECKER, Eric BAUDOUIN, Cyrille BIGOT, Regis KRUMPIPE, Pierre Forging process Process control Hot forming Extrusion Sciences de l'ingénieur: Génie des procédés Sciences de l'ingénieur: Mécanique: Génie mécanique Process control in forging industry is essential to ensure a better quality of the product with a lower cost at the end of the manufacturing process. To control the process, a number of key parameters must be monitored to prevent product or forging plan deviations. This paper will illustrate how a variation in a process parameter can create product specifications deviations and how key parameters influence product final state. The illustration work is done on a part obtained via hot forging. An analysis is made on product parameters such as geometry, by varying the key process parameter values previously determined from a created methodology. This later is represented as a decision support system that connects product specifications (geometry, absence of defects…) or other forging specifications (tool wear, involved energy...) to the process parameters. 2014 Communication avec acte 1877-7058 http://hdl.handle.net/10985/9095 10.1016/j.proeng.2014.10.361 en application/pdf info:eu-repo/semantics/openAccess Elsevier / Takashi Ishikawa and Ken-ichiro Mori http://hdl.handle.net/10985/9095 Laboratoire de Conception Fabrication Commande (LCFC)

oai:sam.ensam.eu:10985/83592025-10-31T01:27:21Zcom_10985_13596col_10985_177

Geometric and form feature recognition tools applied to a design for assembly methodology COMA, Olivier MASCLE, Christian VERON, Philippe Bounding box Design for assembly Feature recognition Fuzzy logic Orientation analysis Symmetry Informatique: Ingénierie assistée par ordinateur The paper presents geometric tools for an automated Design for Assembly (DFA) assessment system. For each component in an assembly a two step features search is performed: firstly (using the minimal bounding box) mass, dimensions and symmetries are identified allowing the part to be classified, according to DFA convention, as either rotational or prismatic; secondly form features are extracted allowing an effective method of mechanised orientation to be determined. Together these algorithms support the fuzzy decision support system, of an assembly-orientated CAD system known as FuzzyDFA. 2003 Article dans une revue avec comité de lecture 0010-4485 http://hdl.handle.net/10985/8359 10.1016/S0010-4485(03)00026-5 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8359 Computer-Aided Design Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/97482025-10-31T01:19:11Zcom_10985_13596col_10985_191

Residual Stress Analysis of Laser-Drilled Thermal Barrier Coatings Involving Various Bond Coats GUINARD, Caroline GUIPONT, Vincent JEANDIN, Michel MONTAY, Guillaume SCHNEIDER, Matthieu GIRARDOT, Jeremie atmospheric plasma spray (APS) cold spray functionally graded coatings hole-drilling method laser drilling residual stress determination thermal barrier coatings (TBCs) Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique The gas turbine combustion chamber of aero-engines requires a thermal barrier coating (TBC) by thermal spraying. Further heat protection is achieved by laser drilling of cooling holes. The residual stresses play an important role in the mechanical behaviour of TBC. It could also affect the TBC response to delamination during laser drilling. In this work, studies of the cracking behaviour after laser drilling and residual stress distribution have been achieved for different bond coats by plasma spray or cold spray. From interface crack length measured pulse-by-pulse after laser percussion drilling at 20° angle, the role of the various bond coats on crack initiation and propagation are investigated. It is shown that the bond coat drastically influences the cracking behaviour. The residual stresses profiles were also determined by the incremental hole-drilling method involving speckle interferometry. An original method was also developed to measure the residual stress profiles around a pre-drilled zone with a laser beam at 90°. The results are discussed to highlight the influence of TBCs interfaces on the resulting residual stresses distribution before laser drilling, and also to investigate the modification around the hole after laser drilling. It is shown that laser drilling could affect the residual stress state. 2014 Article dans une revue avec comité de lecture 1059-9630 http://hdl.handle.net/10985/9748 10.1007/s11666-014-0185-z 1544-1016 en application/pdf info:eu-repo/semantics/openAccess ASM International/Springer http://hdl.handle.net/10985/9748 Journal of Thermal Spray Technology Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/257512025-10-31T02:26:31Zcom_10985_13596col_10985_191

Polyethylene terephthalate (PET) micro- and nanoplastic particles affect the mitochondrial efficiency of human brain vascular pericytes without inducing oxidative stress GETTINGS, Sean Michael TIMBURY, William DMOCHOWSKA, Anna SHARMA, Riddhi MCGONIGLE, Rebecca MACKENZIE, Lewis E. MIQUELARD-GARNIER, Guillaume BOURBIA, Nora Nanoplastic Microplastic Pericytes Oxidative stress Mitochondria PET Polyethylene terephthalate Sciences de l'ingénieur: Micro et nanotechnologies/Microélectronique Sciences de l'ingénieur: Matériaux The objective of this investigation was to evaluate the influence of micro- and nanoplastic particles composed of polyethylene terephthalate (PET), a significant contributor to plastic pollution, on human brain vascular pericytes. Specifically, we delved into their impact on mitochondrial functionality, oxidative stress, and the expression of genes associated with oxidative stress, ferroptosis and mitochondrial functions. Our findings demonstrate that the exposure of a monoculture of human brain vascular pericytes to PET particles in vitro at a concentration of 50 μg/ml for a duration of 3, 6 and 10 days did not elicit oxidative stress. Notably, we observed a reduction in various aspects of mitochondrial respiration, including maximal respiration, spare respiratory capacity, and ATP production in pericytes subjected to PET particles for 3 days, with a mitochondrial function recovery at 6 and 10 days. Furthermore, there were no statistically significant alterations in mitochondrial DNA copy number, or in the expression of genes linked to oxidative stress and ferroptosis, but an increase of the expression of the gene mitochondrial transcription factor A (TFAM) was noted at 3 days exposure. These outcomes suggest that, at a concentration of 50 μg/ml, PET particles do not induce oxidative stress in human brain vascular pericytes. Instead, at 3 days exposure, PET exposure impairs mitochondrial functions, but this is recovered at 6-day exposure. This seems to indicate a potential mitochondrial hormesis response (mitohormesis) is incited, involving the gene TFAM. Further investigations are warranted to explore the stages of mitohormesis and the potential consequences of plastics on the integrity of the blood-brain barrier and intercellular interactions. This research contributes to our comprehension of the potential repercussions of nanoplastic pollution on human health and underscores the imperative need for ongoing examinations into the exposure to plastic particles 2024-04 Article dans une revue avec comité de lecture http://hdl.handle.net/10985/25751 10.1016/j.impact.2024.100508 2452-0748 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/25751 NanoImpact Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/227162025-11-18T08:59:05Zcom_10985_13596col_10985_180col_10985_18058col_10985_191

Mechanical strength and shape accuracy optimization of polyamide FFF parts using grey relational analysis SHAKERI, Zohreh ZIRAK, Nader SHIRINBAYAN, Mohammadali BENFRIHA, Khaled Multidisciplinary Additive manufacturing Parameters Thermoplastic material Fused Filament Fabrication FFF Sciences de l'ingénieur This paper investigates the effect of different additive manufacturing process parameters such as chamber temperature, Printing temperature, layer thickness, and print speed on five essential parameters that characterize the manufactured components: cylindricity, circularity, strength, and Young’s modulus, and deformation by Gray Relational Analysis method simultaneously. Taguchi method was used to design the experiments, and the PA6 cylindrical parts were fabricated using a German RepRap X500® 3D printer. Then the Gray Relational Grade (GRG) values were calculated for all experiments. In the 8th trial, the highest value of GRG was observed. Then, to discover the optimal parameters, the GRG data were analyzed using ANOVA and S/N analysis, and it was determined that the best conditions for enhancing GRG are 60 °C in the chamber temperature, 270 °C in the printing temperature, 0.1 mm layer thickness, and 600 mm/min print speed. Finally, by using optimal parameters, a verification test was performed, and new components were investigated. Finally, comparing the initial GRG with the GRG of the experiments showed an improvement in the gray relational grade (14%) which is accompanying with improving of GRG value. 2022-07 Article dans une revue avec comité de lecture 2045-2322 http://hdl.handle.net/10985/22716 10.1038/s41598-022-17302-z en application/pdf info:eu-repo/semantics/openAccess Springer nature http://hdl.handle.net/10985/22716 Scientific reports (Nature) Laboratoire Conception de Produits et Innovation (LCPI) Laboratoire Ingénierie des fluides Systèmes énergétiques (LIFSE) Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/85782025-11-06T07:47:43Zcom_10985_13596col_10985_180

The integration of new technologies : the stakes of knowledge ROULET, Nicolas LE COQ, Marc DUBOIS, Patrice AOUSSAT, Améziane technological innovation collaboration conception technical knowledge SME laser technics Sciences de l'Homme et Société: Gestion et management Sciences de l'ingénieur: Génie des procédés Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Génie mécanique In order to remain competitive in an increasingly competitive international context, French companies are forced to follow one or more of various possible routes: relocating some of the activities, optimizing the design and / or production process, or innovate technologically. When they choose to develop new technologies, it is advisable to seek outside expertise in different areas. Thus they must exchange and create knowledge in partnership with other companies. But in order to control and integrate this future technology, we support that the acquisition and the capitalization of the technical training, during the process of innovation, are of primary importance. This article demonstrates that the construction of this knowledge base can be achieved only by formalizing close and rigorous collaboration. To do this, we propose a model of the collaborative process, meant for the leaders of innovative projects to support design. Cifre 2010 Article dans une revue avec comité de lecture 1477-9056 http://hdl.handle.net/10985/8578 10.1504/IJPD.2010.034992 1741-8178 en application/pdf info:eu-repo/semantics/openAccess Inderscience http://hdl.handle.net/10985/8578 International Journal of Product Development Laboratoire Conception de Produits et Innovation (LCPI)

oai:sam.ensam.eu:10985/91312025-11-06T07:49:47Zcom_10985_13596col_10985_177

3D sound for simulation of arthroscopic surgery CORENTHY, Loïc ORTEGA-GONZALEZ, Vladimir ESPADERO-GUILLERMO, Jose Miguel GARBAYA, Samir Sound Simulation Surgery Arthroscopy Informatique: Interface homme-machine Informatique: Modélisation et simulation Informatique: Synthèse d'image et réalité virtuelle Arthroscopic surgery offers many advantages compared to traditional surgery. Nevertheless, the required skills to practice this kind of surgery need specific training. Surgery simulators are used to train surgeon apprentices to practice specific gestures. In this paper, we present a study showing the contribution of 3D sound in assisting the triangulation gesture in arthroscopic surgery simulation. This ability refers to the capacity of the subject to manipulate the instruments while having a modified and limited view provided by the video camera of the simulator. Our approach, based on the use of 3D sound metaphors, provides interaction cues to the subjects about the real position of the instrument. The paper reports a performance evaluation study based on the perception of 3D sound integrated in the process of training of surgical task. Despite the fact that 3D sound cueing was not shown useful to all subjects in terms of execution time, the results of the study revealed that the majority of subjects who participated to the experiment confirmed the added value of 3D sound in terms of ease of use. 2010 Communication avec acte 978-0-7918-4908-8 http://hdl.handle.net/10985/9131 10.1115/WINVR2010-3745 en application/pdf info:eu-repo/semantics/openAccess ASME http://hdl.handle.net/10985/9131 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/86012025-11-06T08:02:24Zcom_10985_13596col_10985_13599

Properties evolution of flax/epoxy composites under fatigue loading LIANG, Shaoxiong GNING, Papa-Birame GUILLAUMAT, Laurent Flax fibres Polymer–matrix composites (PMCs) Fatigue Damage mechanics Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Mécanique des matériaux The tension–tension fatigue behaviour of flax fibre reinforced epoxy matrix composites have been investigated for specimens having [0]12, [90]12, [0/90]3S and [±45]3S lay-ups. The Probabilized Stress–Number of cycles (P-S–N) curves have been determined for each laminate type. The measured stress and strain data allowed to quantify the evolution of the mechanical properties, i.e. stiffness, damping and permanent strain as a function of imposed cycles. Especially, the stiffening phenomenon of flax reinforcements oriented parallel to the loading direction has been confirmed. However, due to the competition between damage development and the fibre stiffening, the increase in the longitudinal Young’s modulus was noticed on the composites depending on the ratio of fibres parallel to load direction. Région Bourgogne 2014 Article dans une revue avec comité de lecture 0142-1123 http://hdl.handle.net/10985/8601 10.1016/j.ijfatigue.2014.01.003 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8601 International Journal of Fatigue Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/132362025-11-06T07:55:36Zcom_10985_13596col_10985_190

Hierarchical micromechanical modeling of the viscoelastic behavior coupled to damage in SMC and SMC-hybrid composites ANAGNOSTOU, Dimitrios CHATZIGEORGIOU, George CHEMISKY, Yves MERAGHNI, Fodil Micromechanics Viscoelasticity Inclusion Method Multiscale Modeling Micro-cracks Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Matériaux et structures en mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Sciences de l'ingénieur: Mécanique: Mécanique des solides The aim of this paper is to study, through a multiscale analysis, the viscoelastic behavior of glass reinforced sheet molding compound (SMC) composites and SMC-hybrid composites mixing two types of bundle reinforcement: glass and carbon fibers. SMC exhibit more than two distinct characteristic length scales, so that a sequence of scale transitions is required to obtain the overall behavior of the composite. An analytical procedure is used consisting of properly selected well-established micromechanical methods like the Mori-Tanaka (MTM) and the composite cylinders (CCM) accounting for each scale transition. After selecting a representative volume element (RVE) for each scale, the material response of any given length scale is described on the basis of the homogenized behavior of the next finer one. This hierarchical approach is appropriately extended to the viscoelastic domain to account for the time dependent overall response of the SMC composite material. The anisotropic damage has been introduced through a micromechanical model considering matrix penny-shape microcrack density inside bundles. The capabilities of the hierarchical modeling are illustrated with various parametric studies and simulation of experimental data for glass-based SMC composites. 2018 Article dans une revue avec comité de lecture 1359-8368 http://hdl.handle.net/10985/13236 10.1016/j.compositesb.2018.05.053 1879-1069 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/13236 Composites Part B: Engineering Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3)

oai:sam.ensam.eu:10985/102292025-11-06T07:55:53Zcom_10985_13596col_10985_13599

On the effectiveness of experimenting with C-K theory in design education: analysis of process methodology, results and main lessons drawn BLANCHARD, Philippe CORSI, Patrick CHRISTOFOL, Hervé RICHIR, Simon innovative design design education creativity design methodology C-K theory Sciences de l'Homme et Société: Sciences de l'information et de la communication This paper experiments a transdisciplinary design innovation way in educational contexts through workshops implementing a C-K Theory-based co-evolution between Concepts and Knowledge spaces. At l’école de design Nantes Atlantique EDNA, a ‘posture for humans’ concept subject was prescribed to students working half time in industry as a preparatory phase to the development of a contemporary day bed. The workshop permuted halfway C-K groups’ yields: cross-contents swaps brought ruptures in groups’ bias and enabled locating and addressing cognitive fixations. A log scale expressed relative ΔK increments in mobilized knowledge. Groups’ innovation capability was graded on innovation capability maturity levels relative to C constructs. Engineering students often opened large K gaps while designers amplified C jumps even if bounding K operations. The process improves C-K implementation processes for small organizations and hybridizes competencies. With its primary power to orderly address the known and the imaginary, C-K Theory helps going beyond known design innovation approaches and supports educational settings not far from what is possible about everywhere in all specialty domains. 2013 Communication avec acte http://hdl.handle.net/10985/10229 en application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/10229 Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/88992025-11-06T07:47:26Zcom_10985_13596col_10985_184

Investigation of relationship between drag and lift coefficients for a generic car model DOBREV, Ivan MASSOUH, Fawaz car aerodynamics lift drag Ahmed body wind tunnel investigation CFD Physique: Dynamique des Fluides Informatique: Intelligence artificielle Informatique: Modélisation et simulation Sciences de l'environnement: Ingénierie de l'environnement Sciences de l'ingénieur: Mécanique Sciences de l'ingénieur: Mécanique: Mécanique des fluides The paper presents a study of aerodynamic characteristics of a car, which has the simplified geometric shape, so called Ahmed body. Flow around the body and the influence of its rear slant angle on drag are widely studied by numerous researchers. However, small number of studies treats the relationship between drag and lift and this phenomenon is not fully understood. To clarify the relationship between lift and drag, experiments are conducted in the wind tunnel of ENSAM - Paris. The study is carried out for different rear slant angles in order to determine how the drag coefficient varies with lift. The results of experiments are completed by numerical simulations, which permit to obtain the detailed flow field around Ahmed body and to understand better the effect of rear slant angle on drag and lift coefficients. 2014 Communication avec acte http://hdl.handle.net/10985/8899 en application/pdf info:eu-repo/semantics/openAccess BULTRANS -2014 Proceedings http://hdl.handle.net/10985/8899 Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/257482025-10-31T02:26:36Zcom_10985_13596col_10985_177

AI-Based Interactive Digital Assistants for Virtual Reality in Educational Contexts MCKERN, Arelia MAYER, Anjela GREIF, Lucas CHARDONNET, Jean-Rémy OVTCHAROVA, Jivka Training Solid modeling Visualization Prototypes Virtual environments Systems architecture Real-time systems Recording Reliability Artificial intelligence Informatique: Synthèse d'image et réalité virtuelle Informatique: Intelligence artificielle This study presents and investigates a novel use of Artificial Intelligence (AI) for the creation of digital assistants in Virtual Reality (VR) environments for training and educational contexts. The concept proposed in this work couples two separate AI systems, the Movement Model (MM) and the Language Model (LM), to generate both conversational and visual responses simultaneously. The LM uses a two channel system to simplify communication with the MM, such that it responds to the user through one channel, and provides input to the MM through the other. This input allows the MM to produce context-relevant movements to assist communication with the user. Additionally, since this process is handled automatically by AI systems, it can provide a uniquely simple method for the creation and customization of digital assistants, with minimal technical knowledge or time investment from the user. A proof-of-concept prototype was implemented and underwent preliminary validation via a comparison to the Avatar Replay System (ARS) from our previous work in a user study. It was found that the AI assistants were able to interact with the users comparably to human recordings captured with the ARS assistants. 2024-08-05 Communication avec acte http://hdl.handle.net/10985/25748 10.1109/gecon62014.2024.10734030 en application/pdf info:eu-repo/semantics/openAccess IEEE http://hdl.handle.net/10985/25748 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/203182025-10-31T02:03:52Zcom_10985_13596col_10985_192

Evaluation of Physical Interaction during Walker-Assisted Gait with the AGoRA Walker: Strategies Based on Virtual Mechanical Stiffness SIERRA M, Sergio D. MUNERA, Marcela PROVOT, Thomas BOURGAIN, Maxime CIFUENTES, Carlos A. Electrical and Electronic Engineering Analytical Chemistry Atomic and Molecular Physics, and Optics Biochemistry Sciences du vivant: ingénierie bio-médicale Smart walkers are commonly used as potential gait assistance devices, to provide physical and cognitive assistance within rehabilitation and clinical scenarios. To understand such rehabilitation processes, several biomechanical studies have been conducted to assess human gait with passive and active walkers. Several sessions were conducted with 11 healthy volunteers to assess three interaction strategies based on passive, low and high mechanical stiffness values on the AGoRA Smart Walker. The trials were carried out in a motion analysis laboratory. Kinematic data were also collected from the smart walker sensory interface. The interaction force between users and the device was recorded. The force required under passive and low stiffness modes was 56.66% and 67.48% smaller than the high stiffness mode, respectively. An increase of 17.03% for the hip range of motion, as well as the highest trunk’s inclination, were obtained under the resistive mode, suggesting a compensating motion to exert a higher impulse force on the device. Kinematic and physical interaction data suggested that the high stiffness mode significantly affected the users’ gait pattern. Results suggested that users compensated their kinematics, tilting their trunk and lower limbs to exert higher impulse forces on the device. 2021 Article dans une revue avec comité de lecture http://hdl.handle.net/10985/20318 10.3390/s21093242 en application/pdf info:eu-repo/semantics/openAccess MDPI AG http://hdl.handle.net/10985/20318 Sensors Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/141552025-10-31T01:42:38Zcom_10985_13596col_10985_13598

From resources to a products : which environmental imacts for ecosystem? LARATTE, Bertrand Sciences de l'environnement: Ingénierie de l'environnement Sciences de l'ingénieur: Mécanique For more than one hundred years the industrial revolution explodes all over the world through the different technologies. All these technologies were developed to help and increase the human conditions in providing new products. However, this development demands more and more resources (e.g. energy, water, raw materials) and generates many undesirable consequences with our over consumptions and the industrial systems used for the production. With the development of the research in human health and on the ecosystems, one has capable to assess our potential negative impacts. It exists many model in order to assess the environmental impacts (environmental impacts are on the ecosystem and on human health), one of the most famous methodology is the Life Cycle Assessment (LCA) [1] [2] that is managed by the standard ISO 14040 and ISO 14044. However, even if this methodology is well-known, this one presents many limitations. 2018 Communication sans acte http://hdl.handle.net/10985/14155 en application/pdf application/pdf info:eu-repo/semantics/openAccess info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/14155 Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/150002025-10-31T01:40:16Zcom_10985_13596col_10985_13598

A novel DEM approach for modeling brittle elastic media based on distinct lattice spring model ANDRE, Damien GIRARDOT, Jeremie HUBERT, Cédric Mechanical Engineering General Physics and Astronomy Mechanics of Materials Computational Mechanics Computer Science Applications Sciences de l'ingénieur: Mécanique: Mécanique des matériaux The Discrete Element Method (DEM), also known as Distinct Element Method (DEM), is extensively used to study divided media such as granular materials. When brittle failure occurs in continuum such as concrete or ceramics, the considered media can be viewed as divided. In such cases, DEM offers an interesting way to study and simulate complex fracture phenomena such as crack branching, crack extension, crack deviation under coupled mode or crack lip closure with friction. The fundamental difficulty with DEM is the inability of the method to deal directly with the constitutive equations of continuum mechanics. DEM uses forcedisplacement interaction laws between particles instead of stress-strain relationships. Generally, this difficulty is bypassed by using inverse methods, also known as calibration processes, able to translate macroscopic stress-strain relationships into local force-displacement interaction laws compatible within DEM frameworks. However, this calibration process may be fastidious and really hard to manage. The presented work proposes to improve the Distinct Lattice Spring Model in order to deal with non-regular domains, by using Voronoi cells, which allows to completely fill the volume space of discrete domains. With this approach, the rotational effects must be included in the contact formulation, which enables the management of large rigid body rotations. This work also introduces a simple method to manage brittle fracture. Using non-regular domains avoids the cracks paths conditioning, and allows to reproduce quantitatively the Brazilian test, very popular in the rock mechanics community 2019 Article dans une revue avec comité de lecture 0045-7825 http://hdl.handle.net/10985/15000 10.1016/j.cma.2019.03.013 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/15000 Computer Methods in Applied Mechanics and Engineering Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/251862025-10-31T02:26:05Zcom_10985_13596col_10985_13598col_10985_182

Non destructive control of permanent magnet rotors in a perspective of electric motor circularity SAGNA, Alph MANSOUR, G. CLENET, Stephane PERRY, Nicolas Recycling Electrical Machines Permanent Magnet Rotors classification magnetic field ECOSD Network Sciences de l'ingénieur: Electromagnétisme Sciences de l'ingénieur This work presents an innovative non destructive control process in order to guide for the end of life (re-use or recycling) of permanents magnets (PM) rotors of electric motors. The process is based on the measurement of the external field produced by the PM rotors. A Finite Element model of the rotor and its environment has been used to simulate a process of classification of the geometry of PM rotors, crucial information for the disassembling of the PM. Firstly, using a finite element model, we were able to investigate the field distribution outside the rotor of the magnetic flux density for different PM rotors designs. From this information, we can set up a classification methodology, based on the Central Voronoi Tessellation (CVT) method, which can help to identify how the PM are inserted within the rotor. This information can be very useful to choose PM disassembling process that should be applied. 2024-04-30 Article dans une revue avec comité de lecture 2212-8271 http://hdl.handle.net/10985/25186 10.1016/j.procir.2024.02.024 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/25186 Procedia CIRP Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) Laboratoire d'Electrotechnique et d'Electronique de Puissance (L2EP) de Lille

oai:sam.ensam.eu:10985/89382025-11-06T07:58:13Zcom_10985_13596col_10985_13598col_10985_13599

Micromechanical investigation of the influence of defects in high cycle fatigue GUERCHAIS, Raphaël SAINTIER, Nicolas MOREL, Franck ROBERT, Camille High cycle fatigue Defect Microstructure modelling Anisotropic elasticity Crystal plasticity Sciences de l'ingénieur: Mécanique: Mécanique des matériaux This study aims to analyse the influence of geometrical defects (notches and holes) on the high cycle fatigue behaviour of an electrolytic copper based on finite element simulations of 2D polycrystalline aggregates. In order to investigate the role of each source of anisotropy on the mechanical response at the grain scale, three different material constitutive models are assigned successively to the grains: isotropic elasticity, cubic elasticity and crystal plasticity in addition to the cubic elasticity. The significant influence of the elastic anisotropy on the mechanical response of the grains is highlighted. When considering smooth microstructures, the crystal plasticity have has a slight effect in comparison with the cubic elasticity influence. However, in the case of notched microstructures, it has been shown that the influence of the plasticity is no more negligible. Finally, the predictions of three fatigue criteria are analysed. Their ability to predict the defect size effect on the fatigue strength is evaluated thanks to a comparison with experimental data from the literature. 2014 Article dans une revue avec comité de lecture 0142-1123 http://hdl.handle.net/10985/8938 10.1016/j.ijfatigue.2014.01.005 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8938 International Journal of Fatigue Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/92262021-09-02T17:17:10Zcom_10985_13596col_10985_177

oai:sam.ensam.eu:10985/85642025-11-18T09:28:30Zcom_10985_13596col_10985_184

Experimental study of hydraulic transport of large particles in horizontal pipes REY, Robert RAVELET, Florent BAKIR, Farid KHELLADI, Sofiane Sciences de l'ingénieur: Mécanique: Mécanique des fluides This article presents an experimental study of the hydraulic transport of very large solid particles (above 5 mm) in an horizontal pipe. Two specific masses are used for the solids. The solids are spheres that are large with respect to the diameter of the pipe (5, 10 and 15%) or real stones of arbitrary shapes but constant specific mass and a size distribution similar to the tested spherical beads. Finally, mixtures of size and / or specific mass are studied. The regimes are characterized with differential pressure measurements and visualizations. The results are compared to empirical models based on dimensionless numbers, together with 1D models that are based on mass and momentum balance. A model for the transport of large particles in vertical pipes is also proposed and tested on data available in the Literature, in order to compare the trends that are observed in the present experiments in a horizontal pipe to the trends predicted for a vertical pipe. The results show that the grain size and specific mass have a strong effect on the transition point between regimes with a stationary bed and dispersed flows. The pressure drops are moreover smaller for large particles in the horizontal part contrary to what occurs for vertical pipes, and to the predictions of the empirical correlations. 2013 Article dans une revue avec comité de lecture 0894-1777 http://hdl.handle.net/10985/8564 10.1016/j.expthermflusci.2012.11.003 en_US application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/8564 Experimental Thermal and Fluid Science Dynamique des Fluides (DynFluid)

oai:sam.ensam.eu:10985/223002025-10-31T02:05:46Zcom_10985_13596col_10985_191

A unified non-linear system model view of hyperelasticity, viscoelasticity and hysteresis exhibited by rubber PENAS, Rafael BALMES, Etienne GAUDIN, Arnaud Computer Science Applications Mechanical Engineering Aerospace Engineering Civil and Structural Engineering Signal Processing Control and Systems Engineering Non-linear damping Hysteresis Hyper-visco-elasticity System identification Sciences de l'ingénieur Rubber modeling is an old subject and so many models exist that it is difficult to have a clear vision of what exists and is more appropriate. Rather than attempting a standard review, this paper proposes classification using the traditional system modeling strategy, where raw measurements are either processed to obtain non-parametric models, or used to identify parametric models, whose accuracy can be controlled by order selection or by numerical implementation considerations. A full test campaign, including multi-step relaxation, low speed triangular and sine tests, on a large deformation compression sample is used to illustrate the need to model and combine the base behaviors known as hyperelasticity, viscoelasticity, and rate independent hysteresis. The equivalence between linear viscoelasticity and linear time invariant systems is used to clarify the link between order selection and accuracy of a generalized Maxwell model. Rate independent hysteresis is analyzed using a convolution product like the one used for viscoelastic transients by introducing a relaxation modulus. Measurements of the hysteretic relaxation modulus are used to propose strategies to measure the asymptotic hyperelastic modulus and discriminate between different hysteretic model forms. A parallel between Iwan and Maxwell models is detailed, and non-parametric models are used to show that the two overlap in the low frequency small deformation regime. Regularized rate independent hysteresis and non-linear viscoelasticity are finally shown to lead to a similar view allowing a transition between the rate independent and linear relaxation models. The instantaneous ratio analytic force and displacement signals, or instant complex modulus, is introduced as novel non-parametric estimation of sine measurements and shown to be a powerful tool to analyze and validate the fact that a force rate relaxation with non-linear relaxation frequencies is most appropriate to represent the non-linear coupling of all three effects. 2022-05 Article dans une revue avec comité de lecture 0888-3270 http://hdl.handle.net/10985/22300 10.1016/j.ymssp.2021.108793 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/22300 Mechanical Systems and Signal Processing Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/176462025-10-31T01:52:13Zcom_10985_13596col_10985_6566

A comparative study of frictional response of shed snakeskin and human skin ABDEL-AAL, Hisham ZAHOUANI, Hassan EL MANSORI, Mohamed Friction Skin Snakeskin Dry sliding Sciences de l'ingénieur: Mécanique: Génie mécanique Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Skin in biological systems, including humans, perform several synchronized tasks (mechanical, protec-tive, tactile, sensory, etc.). Tribological function is among skin tasks and may determine the survivabilityof many species. Cross comparison of tribological functional traits of skin of different species, albeit interesting, is rarely encountered, if at all exists, in tribology literature. One interesting example is that of snake and human skins. This skin pair was the subject of many studies for transdermal drug delivery. Results in that context concluded that snakeskin is highly compatible with human skin despite apparent differences in surface structure and topology. The reported compatibility raises curious question ofwhether there exists frictional or tribological compatibility between the two skins and if so, under what conditions, and which context. In this work, we report, for the first time in open literature, results of a comprehensive comparative investigation of shed snakeskin and human skin with respect to tribological behaviour. To this end, we compared the frictional response of shed skin obtained from P. regius and human skin from different anatomical sites, gender, and age. The results imply that, in essence, the mechanisms governing the friction response of human skin are common to snake skin despite difference in chemical composition and apparent surface structure. In particular, both skin types display sensitivity to hysteresis and adhesive dissipation. Human skin, however, being more sensitive to hysteresis than snakeskin. One interesting finding of the study is that the ratio of the coefficients of friction for snake and human skin, when sliding on the same interface, depends on the reciprocal of their respective moduli of elasticity. 2017 Article dans une revue avec comité de lecture 0043-1648 http://hdl.handle.net/10985/17646 10.1016/j.wear.2016.12.055 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/17646 Wear Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/140172025-10-31T01:38:28Zcom_10985_13596col_10985_189

Nanocolumnar TiN thin film growth by oblique angle sputter-deposition: Experiments vs. simulations BOUAOUINA, Boudjemaa MASTAIL, Cédric BESNARD, Aurélien MAREUS, Rubenson NITA, Florin MICHEL, Anny ABADIAS, Grégory TiN Reactive magnetron sputtering Monte Carlo simulations Particle flux GLAD Chimie: Cristallographie Chimie: Matériaux Informatique: Modélisation et simulation Sciences de l'ingénieur: Matériaux Nanostructured columnar titanium nitride (TiN) thin films were produced by oblique angle deposition using reactive magnetron sputtering. The influence of the angular distribution of the incoming particle flux on the resulting filmmorphology (columntilt angle, porosity, surface roughness) was studied by varying the inclination angle α of the substrate at two different working pressures, 0.3 and 0.5 Pa. The microstructural features and columns tilt angles βexp determined experimentally were compared to those simulated from two kinetic Monte Carlo (KMC) models. With increasing pressure, the TiN columns were found to be less defined but no significant changes in βexp were revealed. Both KMC models satisfactorily reproduced the experimental findings, the agreement being closer at 0.5 Pa. The evolution of β angle is also discussed with respect to the resulting incidence angle θres of the incoming flux, this latter quantity accounting for the local incidence angle of individual particles,which may greatly differ fromthe geometrical angle α, especially at highworking pressure due to the incoming particle – gas collisions. Crossover phenomena between the 0.3 and 0.5 Pa series were revealed from the evolution of the film resistivity, as well as simulated layer density and surface roughness versus α angle. This work has been performed within the M.ERA-NET project MC2 “Multi-scale Computational-driven design of novel hard nanostructured Coatings” and funded by the French ANR program (Project No. ANR-13-MERA-0002-02). BB acknowledges the financial support from the Algerian Ministry of Higher Education and Scientific Research through the grant n°173 of the PNE 2016-17 program. 2018 Article dans une revue avec comité de lecture 0264-1275 http://hdl.handle.net/10985/14017 10.1016/j.matdes.2018.09.023 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/14017 Materials and Design Laboratoire des Matériaux et Procédés (LaBoMaP)

oai:sam.ensam.eu:10985/208182025-10-31T02:09:02Zcom_10985_13596col_10985_191

New Advances in the Kinetic Modeling of Thermal Oxidation of Epoxy-Diamine Networks DELOZANNE, Justine MOREAU, Gurvan COLIN, Xavier Materials Science (miscellaneous) Epoxy matrix Thermal oxidation Analytical kinetic model Chain scissions Glass transition temperature Lifetime prediction Sciences de l'ingénieur Sciences de l'ingénieur: Matériaux This article deals with the thermal oxidation mechanisms and kinetics of epoxy-diamine (EPO-DA) networks used as composite matrices reinforced with carbon fibers in the aeronautical field. The first part of this article is devoted to a detailed presentation of the new analytical kinetic model. The so-called “closed-loop” mechanistic scheme, developed in the last 3 decades in our laboratory in order to accurately describe the thermal oxidation kinetics of saturated hydrocarbon polymers, is recalled. Its main characteristics are also briefly recalled. Then, the system of differential equations derived from this oxidation mechanism is analytically solved without resorting to the usual simplifying assumptions that seriously degrade the reliability of all kinetic models. On the contrary, the generalization of the proportionalities observed between the steady concentrations of the different reactive species (i.e., hydroperoxides and alkyl and peroxy radicals) to the entire course of thermal oxidation gives a series of much sounder equations. From this basis, the kinetic model is completed by considering new structure/property relationships in order to predict the consequences of thermal oxidation on the thermomechanical properties, in particular on the glass transition temperature (Tg). To reach this second objective, the two main mechanisms responsible for the alteration of the macromolecular network structure are recalled: chain scissions and crosslinking. Like any other chemical species, their kinetics are directly expressed from the oxidation mechanistic scheme using the classical concepts of chemical kinetics. The second part of this article is devoted to the checking of the kinetic model reliability. It is shown that this latter accurately simulates the experimental curves of carbonyl build-up and Tg decrease versus time of exposure determined in our laboratory for three EPO-DA networks under study, exposed in a wide variety of thermal oxidative environments. The values determined by inverse solving method for the different model parameters are discussed and their temperature dependence are elucidated. Finally, an end-of-life criterion is proposed for predicting the lifetime of EPO-DA networks involving a predominant chain scission process. 2021 Article dans une revue avec comité de lecture 2296-8016 http://hdl.handle.net/10985/20818 10.3389/fmats.2021.720455 en application/pdf info:eu-repo/semantics/openAccess Frontiers Media SA http://hdl.handle.net/10985/20818 Frontiers in Materials Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/113922025-12-16T01:20:45Zcom_10985_13596col_10985_13599

Effet des défauts d’usinage sur la tenue en fatigue d’un alliage Al7050. ABROUG, Foued PESSARD, Etienne GERMAIN, Guénaël MOREL, Franck CHOVE, Etienne tenue en fatigue défauts d'usinage alliage d'aluminium Sciences de l'ingénieur: Mécanique: Mécanique des matériaux Lors du fraisage UGV de pièces aéronautiques, certains défauts géométriques, tels que les ressauts et les marques de vibration, peuvent être générés. Pour obtenir une surface de bonne qualité, une opération de rectification (manuelle et coûteuse) est souvent conduite pour faire disparaître ces défauts d’usinage. Afin d’améliorer leur tenue à la corrosion, ces pièces subissent également un traitement de surface (décapage + anodisation) susceptible de générer des piqûres en surface. L’objectif de cette étude est d’identifier l’impact sur la tenue en fatigue de la présence des défauts de surface crées lors de l’usinage UGV ou du traitement de surface sur l’alliage d’aluminium 7050. Après avoir répertorié et reproduit les défauts de surface fréquemment observés sur les pièces industrielles, une campagne d’essais de fatigue en flexion plane est réalisée. Différents états de surface sont générés sur la surface d’un nombre suffisant de lots d’éprouvettes. Les premières caractérisations d’intégrité de surface réalisées tendent à montrer que l’effet de l’usinage sur les contraintes résiduelles et l’écrouissage est peu marqué dans nos conditions. Seul l’aspect géométrique des surfaces étudiées est donc considéré dans ce travail. L’objectif est dans un premier temps de hiérarchiser les défauts de surface en fonction de leur impact sur la tenue en fatigue tout en fixant des critères discriminants qui spécifient leur acceptabilité. Les résultats montrent qu’il est nécessaire de dégrader de manière importante l’état de surface pour observer un abattement de la tenue en fatigue. Par ailleurs, on constate bien que l’opération de ponçage manuelle permet de supprimer l’effet des défauts d’usinage sur le comportement en fatigue. Afin de prédire l’effet de l’état de surface sur la tenue en fatigue, une approche numérique est également développée. La topologie de surface est caractérisée expérimentalement pour être introduite dans un modèle éléments finis. La localisation de l’amorçage observée numériquement est en accord avec l’expérience. Les prédictions de différents critères en fatigue sont discutées sur une large gamme de défaut de surface. 2016 Conférence invitée http://hdl.handle.net/10985/11392 fr application/pdf info:eu-repo/semantics/openAccess http://hdl.handle.net/10985/11392 Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/257432026-02-21T01:34:51Zcom_10985_13596col_10985_13599

In process temperature and tool wear for the machining of aeronautic aluminum under different lubrication conditions LAVISSE, BRUNO TARDIF, Xavier BONDARENKO, Dmitry RITOU, Mathieu GERMAIN, Guenael Cutting temperature lubrication machinable thermocouples tool wear Sciences de l'ingénieur: Génie des procédés Sciences de l'ingénieur: Mécanique: Thermique The use of aluminum-lithium alloys in aeronautics is an efficient solution for lightweight structures, but its machinability can cause increased tool wear. The cutting temperature is one of the most important parameters controlling the tool wear and the quality of machined surfaces. Therefore, its measurement is of great interest to analyze the heat generation during the cut and then being able to limit it in the cutting edge. This article presents an original experimental study of the cutting temperature of two aluminum alloys (7000 series and Li-containing 2000 series), for dry, MQL: Minimum Quantity of Lubrication and wet machining conditions. The interactions between tool wear and cutting temperature are also investigated. To be able to observe tool wear, the milling of very large volumes of aluminum alloys has been necessary since the tool lifetime is several hours when machining this kind of material. To measure temperature as close as possible the cutting zone, an original set-up with machinable thermocouples was used, enabling measurements on a large frequency bandwidth. Complementary investigations by Second Ion Mass Spectroscopy revealed a diffusion of lithium in the cutting insert, which can reduce its lifetime (divided by 8, with the Li-containing 2000 series compared to the 7000 series). 2023-09-14 Article dans une revue avec comité de lecture 1091-0344 1532-2483 http://hdl.handle.net/10985/25743 10.1080/10910344.2023.2255238 en application/pdf info:eu-repo/semantics/openAccess Informa UK Limited http://hdl.handle.net/10985/25743 Machining Science and Technology Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/97142025-10-31T01:16:05Zcom_10985_13596col_10985_177

A Web Information System for the Semantic-Based Analysis of Architectural Heritage DE LUCA, Livio BUSAYARAT, Chawee STEFANI, Chiara FLORENZANO, M VERON, Philippe Architectural heritage semantic description multi - representation informatio n system internet Informatique: Ingénierie assistée par ordinateur This article focuses on the fields of architectural documentation and digital representation. It concerns the development of an information system at the scale of architecture, taking into account the relationships that can be established between the representation of buildings (shape, dimension, state of conservation, hypothetical restitution) and heterogeneous information about various fields (such as the technical, the documentary or still the historical one). The proposed approach aims to organize multiple representations (and associated information) around a semantic description model with the goal of defining a web information system for the multi-field analysis of heritage buildings. 2011 Communication avec acte 1682-1777 http://hdl.handle.net/10985/9714 en application/pdf info:eu-repo/semantics/openAccess ISPRS http://hdl.handle.net/10985/9714 Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/191642025-10-31T02:01:33Zcom_10985_13596col_10985_192

How the type of sagittal alignment defined by Roussouly determines the gait of asymptomatic adult subject ASSI, Ayman BAKOUNY, Ziad MASSAAD, Abir LAFAGE, Virginie SAGHBINI, Elie KREICHATI, Gaby SKALLI, Wafa GHANEM, Ismat Sciences du vivant While curvatures of the sagittal spine are known to greatly differ among asymptomatic adult subjects, there are no studies that determine whether this heterogeneous normality affects gait. This study aimed to elucidate the relationships between normal sagittal spine profiles and gait in asymptomatic adult subjects. Ninety-one asymptomatic adult subjects (age = 21.6 ±2.2, 47 M & 44F) with no prior orthopedic treatment underwent full body biplanar X rays with 3D reconstruction of the spine and pelvis. The following sagittal spino-pelvic parameters were generated from the 3D reconstructions: pelvic incidence, sacral slope, pelvic tilt, L1L5 lordosis, L1-S1 lordosis, T1-T12 kyphosis and T4-T2 kyphosis. Lower limb kinematics was assessed using 3D gait analysis. Each subject was classified into one of the 4 types of normal sagittal alignment previously described by Roussouly. Kruskal-Wallis test was used to evaluate the differences in gait and spino-pelvic parameters between the Roussouly types. 2016 Article dans une revue avec comité de lecture 1877-0517 http://hdl.handle.net/10985/19164 1877-0517 en application/pdf info:eu-repo/semantics/openAccess Elsevier Masson http://hdl.handle.net/10985/19164 Revue de Chirurgie Orthopédique et Traumatologique Institut de Biomécanique Humaine Georges Charpak (IBHGC)

oai:sam.ensam.eu:10985/80582025-11-06T07:54:35Zcom_10985_13596col_10985_191

Simulation of Polymer Flow Using Smoothed Particle Hydrodynamics Method RIVIERE, Sylvain FARZANEH, Sedigheh TCHARKHTCHI, Abbas BAKIR, Farid KHELLADI, Sofiane Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique Reactive rotational molding (RRM) is a process to manufacture hollow plastic articles. Comparing to rotational molding of thermoplastics, it decreases the process cycle time due to the reactivity of the system. However, the number of influent parameters is relatively high and optimization of the process is complex. During RRM, the viscosity is one of the key parameters and varies according to the polymer molecular weight due to chemical reactions. Simulation is a way to optimize this process. Prediction of the reactive flow is of great interest to optimize process conditions and wall thickness distribution of the molded part. We developed a solver based on smoothed particle hydrodynamics method. This Lagrangian meshfree method is well adapted to simulate free surface flows like those occurring in RRM. First, we validated the code comparing the simulation results to analytical Couette flow solution and experimental measurements of dam break problem. Then, we performed two-dimensional (2D) and 3D simulations to observe the influence of the change of viscosity on the flow, due to the chemical reactions. Adhesion of the polymer on the mold surface is modeled by new boundary conditions. Contract grant sponsor : RAIGI society for providing us the reactive materials and the Single Interministerial Fund (FUI)-SAGANE. 2013 Article dans une revue avec comité de lecture 0032-3888 http://hdl.handle.net/10985/8058 10.1002/pen.23512 1548-2634 en application/pdf info:eu-repo/semantics/openAccess Wiley-Blackwell http://hdl.handle.net/10985/8058 Polymer Engineering and Science Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/155582025-10-31T01:46:00Zcom_10985_13596col_10985_13598

Structuring of embodiment design problem based on the product lifecycle SCARAVETTI, Dominique NADEAU, Jean-Pierre PAILHES, Jerome SEBASTIAN, Patrick embodiment design design problem analysis decision support systems constraint satisfaction problem design process Sciences de l'ingénieur: Mécanique: Génie mécanique Early stages of the design process are often based on designers| experience; assumptions and irreversible decisions restricting the solution space are taken. It is difficult to take into account simultaneously every requirement imposed by the different phases of the product life-cycle. In this paper, a method is proposed to perform the analysis of the embodiment design problem. It facilitates the search of the indispensable elements, suitable for structuring the preliminary design phase. Our approach is performed for the relevant life-cycle situations of the product. A four level analysis (need, functions, organic structure and physical behaviours) is proposed. The set of structuring elements allow the design problem definition as a Constraint Satisfaction Problem (CSP). 2005 Article dans une revue avec comité de lecture 1477-9056 http://hdl.handle.net/10985/15558 10.1504/IJPD.2005.006668 1741-8178 en application/pdf info:eu-repo/semantics/openAccess Inderscience http://hdl.handle.net/10985/15558 International Journal of Product Development Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/215152025-10-31T02:09:09Zcom_10985_13596col_10985_189

New Perspectives for LVL Manufacturing from Wood of Heterogeneous Quality—Part 2: Modeling and Manufacturing of Variable Stiffness Beams DURIOT, Robin DENAUD, Louis POT, Guillaume GIRARDON, Stéphane Forestry LVL Douglas-fir Heartwood Sapwood Bending optimization Veneer quality Four-point bending Local fiber orientation Sciences de l'ingénieur: Mécanique: Mécanique des matériaux This paper presents a new strategy in the use of wood of heterogeneous quality for composing LVL products. The idea is to consider veneers representative of the resource variability and retain local stiffness information to control panel manufacturing fully. The placement of veneers is also no longer random as in the first part of this group of papers but optimized for the quality of veneers according to the requirement of bending stresses along the beam. In a four-point bending test arrangement, this means the high-quality veneer is concentrated in the center of the beam in the area between the loading points where the bending moments are the most important, and the low quality is located at the extremities. This initiates the creation of variable stiffness beams. This is driven by an algorithm developed and tested on representative veneer samples from the resource. Four LVL panels were manufactured by positioning the veneers in the same positions as in an analytical calculation model, which allowed the calculation of beam mechanical properties in four-point bending. The proposed optimization of LVL manufacturing from variable quality veneers should help for more efficient usage of forest resources. This optimization strategy showed notable gains for modeled and experimental mechanical properties, whether in terms of stiffness or strength. The analytical calculation of the local modulus of elasticity from modelized beams was satisfactory compared to the tests of the manufactured beams test results, allowing the reliability of the model for this property to be confirmed. 2021 Article dans une revue avec comité de lecture 1999-4907 http://hdl.handle.net/10985/21515 10.3390/f12091275 en application/pdf info:eu-repo/semantics/openAccess MDPI AG http://hdl.handle.net/10985/21515 Forests Laboratoire des Matériaux et Procédés (LaBoMaP)

oai:sam.ensam.eu:10985/97642025-11-06T07:46:15Zcom_10985_13596col_10985_13599

Perceptual abilities in case of low vision, using a virtual reality environment KLINGER, Evelyne BOUMENIR, Yasmine KADRI, Abdelmajid MURY, Corinne SUIRE, Nadège AUBIN, Pierric low vision perception scene recognition virtual reality Sciences de l'Homme et Société: Sciences de l'information et de la communication Losing our relationship with our environmental conditions may reduce our cognitive abilities to understand them, and so to interact within. Through the SENSIVISE virtual space, we analyzed the perceptual abilities of 27 visually impaired people and 6 controls to perceive and interact while achieving requested tasks based on global or objects perception and recognition. We also tested the contribution of SENSIVISE's adaptations in improving performance and perception. Our results show a large variability of the performance among participants with low vision, according to visual deficiency, task features, and environmental conditions. Laval Agglomération et Conseil Général de la Mayenne Dassault Systèmes 2013 Communication avec acte http://hdl.handle.net/10985/9764 10.1109/ICVR.2013.6662071 en application/pdf info:eu-repo/semantics/openAccess IEEE http://hdl.handle.net/10985/9764 Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

oai:sam.ensam.eu:10985/88142025-10-31T01:17:36Zcom_10985_13596col_10985_13598

Overload effects on a ferritic-baintic steel and a cast aluminium alloy: two very different behaviours SAINTIER, Nicolas PALIN-LUC, Thierry EL DSOKI, Chalid BIDONARD, Hadrien KAUFMANN, Heinz DUMAS, Christian VÖLLMECKE, F.J. SONSINO, Cetin Morris Overloads LCF-HCF Crack initiation Steel Cast aluminium alloy Sciences de l'ingénieur: Mécanique: Génie mécanique Load controlled fatigue tests were performed up to 107 cycles on flat notched specimens (Kt =2.5) under constant amplitude and variable amplitude loadings with and without periodical overloads. Two materials are studied: a ferritic-bainitic steel and a cast aluminium alloy. These materials have a very different cyclic behaviour: the steel exhibits cyclic strain oftening whereas the Al alloy shows cyclic strain hardening. The fatigue tests show that, for the steel, periodical overload applications reduce significantly the fatigue life for fully reversed load ratio (Rr = – 1), while they have no influence under pulsating loading (Rr = 0). For the Al alloy over-loads have an effect (fatigue life decreasing) only for variable amplitude loadings. The detrimental effect of overloads on the steel is due to ratcheting at the notch root which evolution is overload's dependent. 2011 Article dans une revue avec comité de lecture 0933-5137 http://hdl.handle.net/10985/8814 10.1002/mawe.201100868 1521-4052 en application/pdf info:eu-repo/semantics/openAccess Wiley-VCH Verlag http://hdl.handle.net/10985/8814 Materials Science and Engineering Technology / Materialwissenschaft und Werkstofftechnik Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)

oai:sam.ensam.eu:10985/201642025-10-31T02:01:32Zcom_10985_13596col_10985_6657

Extracting Global Shipping Networks from Massive Historical Automatic Identification System Sensor Data: A Bottom-Up Approach WANG, Zhihuan CLARAMUNT, Christophe WANG, Yinhai AIS big data; ship trajectory; shipping network; DBSCAN; stay locations; stop events Informatique The increasing availability of big Automatic Identification Systems (AIS) sensor data offers great opportunities to track ship activities and mine spatial-temporal patterns of ship traffic worldwide. This research proposes a data integration approach to construct Global Shipping Networks (GSN) from massive historical ship AIS trajectories in a completely bottom-up way. First, a DBSCAN (Density-Based Spatial Clustering of Applications with Noise) algorithm is applied to temporally identify relevant stop locations, such as marine terminals and their associated events. Second, the semantic meanings of these locations are obtained by mapping them to real ports as identified by the World Port Index (WPI). Stop events are leveraged to develop travel sequences of any ship between stop locations at multiple scales. Last, a GSN is constructed by considering stop locations as nodes and journeys between nodes as links. This approach generates different levels of shipping networks from the terminal, port, and country levels. It is illustrated by a case study that extracts country, port, and terminal level Global Container Shipping Networks (GCSN) from AIS trajectories of more than 4000 container ships in 2015. The main features of these GCSNs and the limitations of this work are finally discussed. 2019 Article dans une revue avec comité de lecture 1424-8220 http://hdl.handle.net/10985/20164 10.3390/s19153363 en application/pdf info:eu-repo/semantics/openAccess MDPI http://hdl.handle.net/10985/20164 Sensors Institut de Recherche de l’École navale (IRENAV)

oai:sam.ensam.eu:10985/96752025-10-31T01:23:17Zcom_10985_13596col_10985_6566

Quantitative approach to determine the mechanical properties by nanoindentation test: Application on sandblasted materials XIA, Yang BIGERELLE, Maxence BOUVIER, Salima IOST, Alain MAZERAN, Pierre-Emmanuel Nanoindentation Roughness Sandblasting Mechanical properties Sciences de l'ingénieur: Matériaux Sciences de l'ingénieur: Mécanique: Mécanique des matériaux A novel method is developed to improve the accuracy in determining the mechanical properties from nanoindentation curves. The key point of this method is the simultaneous statistical treatment of several loading curves to correct the zero point error and identify the material properties considering size effects. The method is applied to four sandblasted aluminum-based specimens with different surface roughness. A linear relationship is obtained between the standard deviation of the initial contact error and the roughness which highlights the effect of the surface roughness on the reproducibility of the indentation curves. Moreover, the smaller standard deviation of the hardness given by the method confirms the importance of considering the initial contact error for an accurate determination of the material properties. 2015 Article dans une revue avec comité de lecture 0301-679X http://hdl.handle.net/10985/9675 10.1016/j.triboint.2014.07.022 en application/pdf info:eu-repo/semantics/openAccess Elsevier http://hdl.handle.net/10985/9675 Tribology International Laboratoire Mechanics, Surfaces and Materials Processing (MSMP)

oai:sam.ensam.eu:10985/225352025-10-31T02:13:15Zcom_10985_13596col_10985_177

Subharmonic centrifugal pendulum vibration absorbers allowing a rotational mobility MAHE, V. RENAULT, Alexandre GROLET, Aurélien MAHE, Hervé THOMAS, Olivier Computer Science Applications Mechanical Engineering Aerospace Engineering Civil and Structural Engineering Signal Processing Control and Systems Engineering Centrifugal pendulum vibration absorber Non-linear dynamics Subharmonic absorber Sciences de l'ingénieur: Mécanique: Vibrations Sciences de l'ingénieur: Mécanique: Génie mécanique Rotating machines are often subjected to fluctuating torques, leading to vibrations of the rotor and finally to premature fatigue and noise pollution. This work addresses a new design of centrifugal pendulum vibration absorbers (CPVAs), used to reduce the vibrations in an automotive transmission line. These passive devices, composed of several masses oscillating along a trajectory relative to the rotor, are here tuned at a subharmonic of the targeted harmonic torque frequency. Thanks to the inherent non-linearities, a CPVA with two masses oscillating in phase opposition is able to efficiently counteract the input torque, with particular features such as saturation phenomena. This work particularly extends previous works to a new class of CPVA, whose peculiarity is that masses admit a significant rotation motion relative to the rotor, thus adding the benefit of their rotatory inertia. Results on the system’s subharmonic response and its stability are obtained thanks to an analytical perturbation method, and design guidelines are proposed. The validity of those results is also confirmed through comparisons with numerical solutions and the performance of this subharmonic system is compared to that of a classical CPVA tuned at the torque frequency. 2022-09 Article dans une revue avec comité de lecture 0888-3270 http://hdl.handle.net/10985/22535 10.1016/j.ymssp.2022.109125 en application/pdf info:eu-repo/semantics/openAccess Elsevier BV http://hdl.handle.net/10985/22535 Mechanical Systems and Signal Processing Laboratoire d’Ingénierie des Systèmes Physiques Et Numériques (LISPEN)

oai:sam.ensam.eu:10985/232642025-11-18T09:09:44Zcom_10985_13596col_10985_13599col_10985_191

Introduction for the special Issue: statistical fluid dynamics AMMAR, Amine VALETTE, Rudy CHINESTA SORIA, Francisco General Physics and Astronomy Engineering sciences Mechanical engineering Mechanics Fluids mechanics Condensed matter Soft condensed matter Sciences de l'ingénieur Sciences de l'ingénieur: Mécanique: Mécanique des fluides Characterizing complex material consists in establishing the relationship between flow rheology during forming processes and the induced micro-structural state that affects directly the final mechanical properties of the formed parts [...] 2022-06 Article dans une revue avec comité de lecture 1099-4300 http://hdl.handle.net/10985/23264 10.3390/e24060782 en application/pdf info:eu-repo/semantics/openAccess MDPI AG http://hdl.handle.net/10985/23264 Entropy Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA) Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM)

oai:sam.ensam.eu:10985/215552025-11-20T01:28:35Zcom_10985_13596col_10985_192

Biplanar Low-Dose Radiograph Is Suitable for Cephalometric Analysis in Patients Requiring 3D Evaluation of the Whole Skeleton KERBRAT, Adeline RIVALS, Isabelle DUPUY, Pauline DOT, Gauthier BERG, Britt-Isabelle ATTALI, Valérie SCHOUMAN, Thomas General Medicine Biplanar X-ray Cephalometric analysis Lateral cephalograms Reliability Sciences du vivant Background: The biplanar 2D/3D X-ray technology (BPXR) is a 2D/3D imaging system allowing simultaneous stereo-corresponding posteroanterior (PA) and lateral 2D views of the whole body. The aim of our study was to assess the feasibility of cephalometric analysis based on the BPXR lateral skull view to accurately characterize facial morphology. Method: A total of 17 landmarks and 11 angles were placed and/or calculated on lateral BPXR and lateral cephalograms of 13 patients by three investigators. Five methods of angle identification were performed: the direct construction of straight lines on lateral cephalograms (LC-A) and on BPXR (BPXR-A), as well as the calculation of angles based on landmark identification on lateral cephalograms (LA-L) and on BPXR with the PA image (BPXR-LPA) or without (BPXR-L). Intra- and interoperator reliability of landmark identification and angle measurement of each method were calculated. To determine the most reliable method among the BPXR-based methods, their concordance with the reference method, LC-A, was evaluated. Results: Both imaging techniques had excellent intra- and interoperator reliability for landmark identification. On lateral BPXR, BPXR-A presented the best concordance with the reference method and a good intra- and interoperator reliability. Conclusion: BPXR provides a lateral view of the skull suitable for cephalometric analysis with good reliability. 2021 Article dans une revue avec comité de lecture 2077-0383 http://hdl.handle.net/10985/21555 10.3390/jcm10235477 en application/pdf info:eu-repo/semantics/openAccess MDPI AG http://hdl.handle.net/10985/21555 Journal of Clinical Medicine Institut de Biomécanique Humaine Georges Charpak (IBHGC) oai_dc////100