Abstract,Author,DOI,ISSN,Journal issue,Journal title,Pagination,Preprint/Postprint,Publication title,Publication type,Publisher,Volume,Year
"n this work, the rotational molding process is developed to manufacture in one piece an axial-flow turbomachine rotor with hollow blades. Giving to our knowledge, this process has never been employed in the making of these turbomachine components. Indeed, the blades of these rotors are typically solid blades and are making by injection molding, machining, or thermoforming. The effects of three relevant factors of the rotational molding process are studied here: oven temperature, time of heating, and cooling rate. The cooling of the moving mold is managed by simple convection-of-air, or by convection-of-air charged with water particles. For the oven temperature of 285 °C, hollow-blades rotors of good quality are gotten in 12 min per cycle. In addition, aerodynamic characteristics of one rotational molded rotor are compared to those of another part machined in aluminum piece. Characteristics of this aluminum rigid-rotor are assumed as reference.","LUCAS, Albert||DANLOS, Amélie||SHIRINBAYAN, Mohammadali||MOTAHARINEJAD, Vajihe||PARIDAENS, Richard||BAKIR, Farid||BENFRIHA, Khaled||TCHARKHTCHI, Abbas","10.1007/s00170-019-03962-1","0268-3768",,"International Journal of Advanced Manufacturing Technology","1-12","Post-print","Conventional rotational molding process and aerodynamic characteristics of an axial-flow hollow blades rotor","Article dans une revue avec comité de lecture","Springer Verlag",,"2019"
"During Reactive Rotational Molding (RRM), it is very important to predict the fluid flow in order to obtain the piece with homogeneous shape and high quality. This prediction may be possible by simulation the fluid flow during rotational molding. In this study we have used a mixture of isocyanate and polyol as reactive system. The kinetic rheological behaviors of thermoset polyurethane are investigated in anisothermal conditions. Thanks to these, rheokinetik model of polyurethane was identified. Then, to simulate the RRM, we have applied Smoothed Particles Hydrodynamics (SPH) method which is suited method to simulate the fluid flow with free surface such as occurs at RRM. Modelling and simulating reactive system flow depend on different parameters; one of them is the surface tension of reactive fluid. To implement force tension surface, the interface between polymer and air is dynamically tracked by finding the particles on this border. First, the boundary particles are detected by free-surface detection algorithm developed by Barecasco, Terissa and NAA [1, 2] in two and three dimension. Then, analytical and geometrical algorithms have been used for interface reconstructions. The aim of this work is the implementation of surface tension force in the SPH solver applied to RRM. To illustrate that, we used novel and simple geometric algorithm fitting circle and fitting sphere, in two and three dimensional configurations, respectively. The model has been validated using a well-known dam break test case which covered the experimental data.","HAMIDI, A.||KHELLADI, Sofiane||ILLOUL, A.||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas","10.1007/s12289-015-1217-z","1960-6206","2","International Journal of Material Forming","131-148","Post-print","Implementation of surface tension force in fluid flow during reactive rotational molding","Article dans une revue avec comité de lecture","Springer Verlag","9","2015"
"Poly (phenylene sulfide) (PPS) is one kind of high‐performance polymer with high thermal stability that can be used widely in different industrial domains. However, according to an investigation of the literature, few reviews have comprehensively focused on the continuous development of PPS applications in the past decade. To meet this demand, this paper provides an overall investigation of PPS polymer and PPS‐based composites from synthesis and process to applications. Briefly, this paper introduces PPS materials according to the following topics. First, the molecular weight distribution and morphology of PPS, as well as their reinforced parts, are introduced. Afterward, the topic is focused on the synthesis, process, and blending of PPS. In the next part, this paper investigates the key points regarding PPS as a high‐performance polymer, focusing on the aspect of thermal behavior and mechanical properties. Finally, PPS composite applications are emphasized and overviewed from a wide range of aspects.","ZUO, Peiyuan||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1002/mame.201800686","1438-7492","5","Macromolecular Materials and Engineering","1-27","Post-print","Overall Investigation of Poly (Phenylene Sulfide) from Synthesis and Process to Applications—A Review","Article dans une revue avec comité de lecture","Wiley-VCH Verlag","304","2019"
"In this paper, two kinds of PPS/GF composite samples (PPS-0°, PPS-90°) were prepared with two different fiber main orientations related to the injection direction. A wide range of their properties were discussed. Using DMTA analysis, it was shown that the PPS/GF composite under study obeyed the time-temperature equivalence principle. Moreover, Perez model was verified and gave a good estimation of the viscoelastic properties of the PPS/GF. Monotonic and fatigue behaviors and fatigue life of PPS/GF were investigated. Fiber's orientation, applied amplitude and loading frequency effects were emphasized. Self-heating effect on fatigue strength was also analyzed. SEM fracture surface observations allowed analyzing, at the local scale, the main deformation mechanisms occurring during mechanical loading. No evident damage development was observed for both monotonic and fatigue loading. PPS matrix plasticity appeared to be the predominant deformation mechanism until a semi-ductile or semi-brittle final failure depending on the loading conditions and local microstructure.","ZUO, Peiyuan||BENEVIDES, R.C.||LARIBI, M.A.||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1016/j.compositesb.2018.03.031","1359-8368",,"Composites Part B: Engineering","173-181","Post-print","Multi-scale analysis of the effect of loading conditions on monotonic and fatigue behavior of a glass fiber reinforced polyphenylene sulfide (PPS) composite","Article dans une revue avec comité de lecture","Elsevier","145","2018"
"Abstract: Fused filament fabrication (FFF), which is an additive manufacturing technique, opens alternative possibilities for complex geometries fabrication. However, its use in functional products is limited due to anisotropic strength issues. Indeed, the strength of FFF fabricated parts across successive layers in the build direction (Z direction) can be significantly lower than the strength in X–Y directions. This strength weakness has been attributed to poor bonding between printed layers. This bonding depends on the temperature of the current layer being deposited—at melting temperature (Tm)—and the temperature of the previously deposited layer. It is assumed that depositing a layer at Tm on a layer at temperature around crystallization temperature (Tc) would enable higher material crystallinity and thus better bonding between previous and present layers. On the contrary, if the previous layer temperature is below Tc, material crystallinity will be low and bonding strength weak. This paper aims at studying the significant effect of temperature difference (ΔT) between previous and current deposited layers temperatures on (1) inter-layers bonding strength improvement and (2) part dimensions, geometry and structure stability. A 23% increase in the inter-layers bonding strength for previous layer temperature slightly higher than Tc reported here confirms the above assumption and offers a first solution toward the increase in inter-layers bonding strength in FFF.","VANAEI, Hamid Reza||RAISSI, Kaddour||SHIRINBAYAN, Mohammadali||KHELLADI, Sofiane||TCHARKHTCHI, Abbas||DELIGANT, Michael||FITOUSSI, Joseph","10.1007/s10853-020-05057-9","0022-2461","29","Journal of Materials Science","14677-14689","Post-print","Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts","Article dans une revue avec comité de lecture","Springer Verlag","55","2020"
"In this paper, the thermo-oxidation for a short glass fiber–reinforced polyphenylene sulfide (PPS/GF) composite was experimentally and theoretically studied by a wide range of physicochemical and mechanical techniques. The accelerated thermal aging temperatures were fixed at 100°C, 140°C, 160°C, 180°C, and 200°C. Firstly, the results of weight loss under aging indicate the formation of volatile products because of chain scission of end groups. Also, Fourier-transform infrared spectroscopy (FTIR) results suggest that the formation and accumulation of carbonyl group arising from the formation of hydroperoxides in oxidative propagation process. In all cases of different thermal oxidation temperatures, it is hard to observe some significant change about the concentration of carbonyl group during the induction time. This induction time depends inversely on the oxidation temperature. Moreover, the cross-linking and chain scissions exist together according to the results of rheological results and it is easier to see the cross-linking phenomenon at the beginning of oxidation while the chain scissions are more pronounced, with the oxidation process developing further. In aspect of mechanical properties, σ max increases at the beginning of oxidation because of cross-linking, and subsequently, the σ max always decreases because of thermo-oxidation of the PPS matrix. In addition, the detailed thermo-oxidation processes are fully discussed in the end of this study. A mechanistic schema has been proposed to present different oxidation reactions of PPS polymer and then a kinetic model has been extracted from this mechanism. Afterwards, the model has been verified by experimental results at different temperatures.","PEIYUAN, Zuo||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1002/pat.4495","1042-7147",,"Polymers for Advanced Technologies","584-597","Post-print","Multiscale physicochemical characterization of a short glass fiber–reinforced polyphenylene sulfide composite under aging and its thermo-oxidative mechanism","Article dans une revue avec comité de lecture","Wiley","30","2019"
"In this article, the overall mechanical properties of a short glass fiber-reinforced polyphenylene sulfide (PPS) composite were tested after oxidation at different temperatures (140, 160, 180, and 200°C), with a maximum oxidation time of approximately 5,300 h. In aspect of thermal aging process, the oxidation rates in 200 and 180°C are considerably harsher and faster than the case in 160 and 140°C, according to the concentration evolution of [C=O]. In aspect of mechanical properties, for virgin samples, due to an excellent fiber–matrix adhesion, no progressive damage is developed. Moreover, the fatigue results of aged samples show that the fatigue lifetime of PPS composites decreases more and more obviously with the oxidation time increasing while no significant loss of stiffness is observed. In addition, both monotonic and cyclic loadings are basically driven by the PPS matrix deformation. In the end, the relationship between fatigue lifetime and concentration of [CO] is built and discussed.","ZUO, Peiyuan||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1002/pen.25003","0032-3888","4","Polymer Engineering and Science","765-772","Post-print","Thermal aging effects on overall mechanical behavior of short glass fiber-reinforced polyphenylene sulfide composites","Article dans une revue avec comité de lecture","Wiley-Blackwell","59","2019"
"In this study, virgin and thermal aged PPS samples were prepared and tested using different techniques such as thermogravimetric analysis (TGA), coupled TGA–Fourier transform infrared spectroscopy (FTIR), and FTIR as well as optical microscopy. Some interesting research results can be summarized as follows: TGA results prove the PPS composite samples aged at 180 and 200°C have been degraded obviously during the aging period in oven. Moreover, accelerated aging leads to the degradation of PPS composite with the observation of increased thermal oxidation layer from outside to inside. There is a plateau standing at about 350 μm for the thermal oxidation layer at oxidation temperature of 200°C. Some thermal decomposition models are applied to clarify the degradation kinetics of PPS composite. According to the activation energy value, it appears degradation more easily at the beginning of the heating process in the atmosphere of oxygen than that of nitrogen. Moreover, the related products of PPS composites during pyrolysis are fully discussed with the combined analysis of TGA–FTIR techniques.","ZUO, Peiyuan||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1002/app.49031","0021-8995",,"Journal of Applied Polymer Science","1-11","Post-print","Multiscale thermal study of virgin and aged polyphenylene sulfide reinforced by glass fiber","Article dans une revue avec comité de lecture","Wiley",,"2020"
"Fused filament fabrication (FFF) is an additive manufacturing (AM) process that provides physical objects commonly used for modeling, prototyping and production applications. The major drawback of this process is poor mechanical property due to the porous structure of final parts. This process requires careful management of coalescence phenomenon. In this paper, the major influencing factors during the FFF processing of poly(lactic acid) (PLA) were investigated experimentally and with a numerical model. It has been shown that the polymer temperature has a significant effect on the rheological behavior of PLA, especially on the adhesion of the filaments. An experimental set-up has been placed in the machine to have the cyclic temperature of the filament. A variation of the polymer temperature influences process parameters such as feed rate, temperature of the nozzle and temperature of the platform. The results showed that the amount of polymeric coalescence (neck growth) rises when increasing the feed rate, the nozzle temperature, and the platform temperature. A model to predict the neck growth is proposed. It predicts a lower amount of neck growth value than obtained experimentally. This difference has been explained as the effect of other phenomena, such as polymer relaxation time, pressure of the nozzle and especially cyclic temperature which is not taken into account in the model.","KALLEL, Achraf||KOUTIRI, Imade||BABAEITORKAMANI, E.||KHAVANDI, A.||TAMIZIFAR, M.||SHIRINBAYAN, Mohammadali||TCHARKHTCHI, Abbas","10.3139/217.3718",,"4","International Polymer Processing","434-444","Post-print","Study of Bonding Formation between the Filaments of PLA in FFF Process","Article dans une revue avec comité de lecture",,"34","2019"
"In this study, the main purpose is to systematically evaluate isothermal and non-isothermal crystallization behavior of short glass fiber-reinforced polyphenylene sulfide polymer composites (PPS/GF) by a wide range of commonly applied models and also to preciously discuss the crystallization evolution and dynamic mechanical properties together with the consideration of thermal aging effects. Some interesting progress concerning this study can be concluded as follows: the Avrami model was used to examine the isothermal crystallization behavior of PPS/GF and the Avrami plot results exhibit that the isothermal crystallization contains primary and second crystallization process. In terms of non-isothermal crystallization, the Jeriorny model and Mo model could describe the mechanism of nucleation and crystal growth of PPS/GF material under study. Also, the activation energy of non-isothermal crystallization is calculated (−58.78 kJ/mol) by Kissinger method. Another important aspect is that thermal aging has an obvious effect on crystallization behaviors of PPS under study. The degree of crystallinity increases from 44% (virgin sample) to 56% after 96 h of aging at 200 °C. After a long period of oxidation up to 1080 h at 200 °C, the crystallinity degree decreases to 36.6% due to thermo-oxidation effect. DMA results imply that thermal aging may lead to more crosslinking reactions and result into more restriction of molecule mobility in PPS composite materials.","ZUO, Peiyuan||SHIRINBAYAN, Mohammadali||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1007/s10965-020-02051-2","1022-9760","3","Journal of Polymer Research","1-11","Post-print","Effect of thermal aging on crystallization behaviors and dynamic mechanical properties of glass fiber reinforced polyphenylene sulfide (PPS/GF) composites","Article dans une revue avec comité de lecture","Springer Verlag","3","2020"
"The objective of this work is to initiate the discussion about multiphysics relationships between the molten and solid states of high-density polyethylene (HDPE). The extrusion and the injection processes are employed to prepare samples, and the experimental procedures, using differential scanning calorimetry, dynamic thermomechanical analysis (DMTA), thermal gravimetric analysis, and rheological measurements, are defined to choose the optimal variables. After different characterizations, the extrusion and injection temperatures of 220 and 230 °C have been chosen. To investigate the viscoelastic behavior of HDPE, the DMTA is used. To perform the high strain rate tensile tests, tensile machine was equipped with a specific furnace. Two temperatures, −20 and 20 °C, with strain rates varying from 0.001 to 100 seconds−1 were used to compare the flow characteristics. Results showed that by increasing the strain rate the molecular mobility of the HDPE chains is decreased. In addition, to the tests at −20 °C, the increase of Young's modulus can be properly observed, under high strain rates.","LAMRI, Abderrahmane||SHIRINBAYAN, Mohammadali||PEREIRA, Michaël||TRUFFAULT, Laurianne||BAKIR, Farid||TCHARKHTCHI, Abbas||FITOUSSI, Joseph","10.1002/app.48778","0021-8995","23","Journal of Applied Polymer Science","1-10","Post-print","Effects of strain rate and temperature on the mechanical behavior of high-density polyethylene","Article dans une revue avec comité de lecture","Wiley","137","2020"
