Tesis sobre el tema "Moulage par injection de résine"
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Zhang, Fan. "Modélisation en contexte aléatoire des propriétés de transport des matériaux fibreux". Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10125.
In the Resin Transfer Molding (RTM) processes, the randomness in the permeability of fibrous reinforcement leads to irregular flow patterns and defects in composite products. A methodology has been developed for applying stochastic computational methods to simulate the uncertainty propagation from the fibrous architecture to the mold-filling responses, so as to study the stochastic phenomena in the RTM filling stage. Based on the developed numerical schemes for mold-filling simulation, the solutions of the stochastic system, by either intrusive or non-intrusive techniques, are implemented. The bidirectional non-crimp fabric with periodic architecture and the chopped strand mat with random architecture have been studied, respectively. The random architectural parameters are extracted by analyzing dry fabric images. Local permeability model accounting for the randomness in architecture is constructed by numerical simulation of unit cell flow physics or statistical continuum approach. Statistical properties are evaluated and used in the stochastic simulation to predict the statistics of mold-filling responses, which are compared with the experimental results for validation of the stochastic permeability model. In addition, numerical simulation methods are implemented for other mold-filling mechanisms with uncertainty involved, e.g. the race-tracking, the saturation of wrinkled fabric and the dual-scale saturation, to study other stochastic phenomena in the RTM filling process
Lefèvre, Delphine. "Étude expérimentale, modélisation et simulation de la filtration lors de l'écoulement d'une résine chargée de particules à travers un renfort fibreux dans les technologies LCM". Lille 1, 2007. http://www.theses.fr/2007LIL10144.
Diallo, Ouaténi. "Modélisation et simulation numérique de résines réactives dans un milieu poreux". Lyon 1, 2000. http://www.theses.fr/2000LYO10027.
Miranda, Campos Bernard. "Copolymer-based PLLA matrix composites produced by TP-RTM". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR042.
The present study experimentally investigated the production of poly(L-lactide)-based matrix composites by Thermoplastic Resin Transfer Molding (TP-RTM). In this process, the in-situ ring opening polymerization of L-lactide (L-LA) and ε-caprolactone (ε-CL) was performed in a single step to achieve composites with a biodegradable poly(L-lactide-co-ε-caprolactone) (PLCL) matrix in one step synthesis. The incorporation of ε-CL in the matrix was aimed at reducing the brittleness of PLLA. The resulting PLCL matrix was reinforced with glass or carbon fabrics. Different L-LA / ε-CL molar ratios were tested, leading to the development of composites with various chemical, thermal, and mechanical properties. The TP-RTM parameters were optimized to produce composites with reduced voids. Subsequently, these composites were characterized to evaluate monomers conversions, molecular weights and thermal properties of the matrices, as long as the mechanical properties of the resulting composites. It was found that PLCL / glass fabric composites exhibit higher impact resistance compared to their PLLA-based counterparts. On the other hand, PLCL / carbon fabric composites display remarkable lightweight properties with high bending strength. The fractures of the composites after mechanical tests were studied to identify the failure type during these experiments. In a more sustainable approach, fully biodegradable PLLA / flax composites were produced using TP-RTM, and their chemical, thermal, and mechanical properties were also studied. Furthermore, the impact of accelerated aging, i.e under temperature and UV irradiation, was studied on all composites. After aging, a relationship between crystallinity, matrices molecular weights and bending properties was established
Fontanier, Jean-Charles. "Développement d'un système réactif pour composites acryliques par procédé RTM". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI024.
Nowadays, polymer matrix composites are widely used for aerospace, automotive, railway and sport industries. For similar structural properties, these materials coul be very attractive since they could be 30 to 40% lighter than metallic counterparts. In the current context of environmental development issues, thermoplastic-based composites, (in our case acrylic matrix based one), can be considered as they can be easily recycled as opposed to thermoset-based ones. Furthermore, they could exhibit good mechanical properties, i.e. stiffness and impact resistance, enabling them to be relevant for many applications. Manufacturing structural composites requires to produce parts without defects having complex geometries. For this purpose Resin Transfer Molding (RTM) has been selected to process such composites. Indeed, it corresponds to a low temperature closed-mold process allowing for manufacturing complex continuous fiber-based-reinforced parts. However, it requires precursors with a very low viscosity (η < 1 Pa.s) to ensure a good impregnation of the dry preform. To be cost effective, fast reactive systems have also to be selected. Thermoplastic polymers which own a very high viscosity in molten state cannot be directly used. Our strategy is to design an acrylic-based reactive formulation exhibiting a very low initial viscosity, i.e. about 100 mPa.s and which can subsequently polymerizes via a free radical mechanism once the mold is filled and the preform fully impregnated. Therefore, our main objective is to optimize curing conditions (especially thermal initiator ratios and temperature) of RTM-compatible acrylic-based reactive formulations to lead to suitable composite parts with high conversion rate, low residual monomer content and relevant process cycles
Krstev, William. "Moulage par injection de pièces en titane /". Sion, 2008. http://doc.rero.ch/record/12804?ln=fr.
DUTILLY, MARC. "Modelisation du moulage par injection de poudre metallique". Besançon, 1998. http://www.theses.fr/1998BESA2019.
Gingras, Steve. "Développement d'un nouveau procédé de moulage par injection de poudres". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0003/MQ31727.pdf.
Gantois, Renaud. "Contribution à la modélisation de l'écoulement de résine dans les procédés de moulage des composites par voie liquide". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1652/.
Liquid Composite Molding (LCM) is more and more used in industry for its ability to produce complex and large parts at low cost. However, this process needs a special care to anticipate properly the impregnation of the fibrous reinforcement, which remains a challenging task important to achieve. This work is divided into an experimental and a numerical study. It aims to model the resin flow through the fibrous reinforcement occurring during the mold filling stage. An experimental setup has been designed to measure both plane and transverse permeabilities of the reinforcement. The numerical study is focused on the simulation of the flow at macroscopic and microscopic scales. At macro scale, our main contribution is the coupling between BEM and Level Set methods, which has been achieved for both 2D and 3D problems. At micro scale, a stationary BEM solver has been developed to evaluate the transverse permeability of a 2D fibrous microstructure
Gonnet, Jean-Marc. "Contrôle en ligne du moulage par injection des thermoplastiques semi-cristallins par spectroscopie diélectrique". Saint-Etienne, 2000. http://www.theses.fr/2000STET4003.
Barrière, Thierry. "Expérimentations, modélisation et simulation numérique du moulage par injection de poudres métalliques". Besançon, 2000. http://www.theses.fr/2000BESA2043.
Mendoza, Rennan. "Morphologies induites dans les pièces en polyolefine moulées par injection". Paris, ENSAM, 2005. http://www.theses.fr/2005ENAM0006.
This work gave for objective to finely characterize the morphologies which could be found through the thickness of injection moulded plates of polypropylene and linear polyethylene, and to determine the influence of some processing parameters on these morphologies. The orientation functions of the different crystallographic axes were determined by infrared dichroism and waxs pole figures obtained with rotating anode generated beam and synchrotron beam. The lamellar distribution and dimensions were determined by saxs. Finally, the crystalline structures size was characterized by polarized light optical microscopy. The whole of the results was used to generate morphological models through the thickness of the injection moulded plates. Complex morphological structures, induced by deformation, were found: shish-kebabs with epitaxial grow of daughter lamellae for pp and with twisted to right lamellae for hdpe. More generally, the orientation of the amorphous phase is low and the anisotropy of the mechanical properties of polyolefins is controlled by the high orientation of the crystalline phase. The plate thickness and the polymer molecular weight have a strong influence on the molecular orientation and on the obtained crystalline morphologies, whereas the injection speed determines the thickness of the various morphological layers through the thickness, without appreciably modifying neither the molecular orientation levels, nor the lamellar dimensions
Bigot, Erwan. "Simulation tridimensionnelle du remplissage de corps minces par injection". Paris, ENMP, 2002. http://www.theses.fr/2002ENMP1073.
Pichelin, Élisabeth. "Calcul par éléments finis du remplissage 3D pour des fluides visqueux incompressibles : Application à l'injection". ENSMP, 1998. http://www.theses.fr/1998ENMP0759.
Le, Minh Cuong. "Effet de la pression sur le comportement en mise en œuvre des polymères". Nantes, 2011. https://archive.bu.univ-nantes.fr/pollux/show/show?id=c2102e99-b11d-4a4f-8de9-8c3152d50d65.
This work deals with the influence of the holding pressure in the case of the in- jection moulding of a semi-crystalline polymer (isotactic polypropylene). A suitable embedded thermocouple probe, build in-house, is used to measure the moulded part temperature under different values of the holding pressure (up to 60 MPa). The per- formed measurements show that the core temperature is piezo-dependent especially the crystallization plateau area. The crystallization plateau piezo-dependency is in good agreement with what was already observed by some authors. The results show that an increase of the holding pressure level leads to a quicker cooling of the moul- ded part. In order to predict the part cooling, a numerical tool that calls Comsol Multiphysics for the finite element analysis was developed. This tool permits one to simulate the part cooling from the end of the cavity filling to the complete freeze out of the mould. In addition to this, the developed tool can be used to identify the thermo and piezo-dependence of the injected polymer properties. Thus, the tool is used successfully to identify the piezo-dependence of the crystallization parameters T f and T 9 as well the thermal conductivity. The obtained results are in good agree- ment with those reported in literature. This study shows that taking into account the piezo-dependence of some material properties is necessary in order to achieve accurate prediction of the moulded part cooling$$2p. Xiii
Ben, Daly Hachmi. "Caractérisation de la morphologie des pièces obtenues en moulage par injection et en injection-soufflage par la technique de spectroscopie infrarouge". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0023/NQ37373.pdf.
Fekiri, Nasser. "Etude expérimentale du moulage par injection des élastomères : analyse thermique et énergétique du procédé". Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4006/document.
The control of the thermal cycles during the operations of moulding of elastomers is an important issue for the rubber industry. The scientific objective of this work is to reach a precise control of the temperature in the moulds during the molding operations in order to optimize the conditions of thermal regulation of those as of the design. In this work, we propose a new design of the moulds, its heating system and regulation allowing us to control the temperatures closest to the part material. The originality of this mould lies in the reduction of the heated mass of the steel and the installation of heating zones thermally isolating between them and independently controlled. This approach was validated by the installation of an original experimental setup in order to study the heat transfers in the tools during the injection of elastomer. A fine and complex instrumentation of the mould in the moulding cavities and the channels of injection matter, allows the follow-up of the evolution of the thermal field. An experimental measurement makes it possible to study the thermal phenomena intervening in the tools during the moulding cycles and to check the homogeneity of the temperatures fields in the mould. It makes it possible to validate the thermal stability of the tools in the course of production. These measurements make it possible to build an experimental database to supply the digital tools of assistance to the design of the tools. The thermic analyses and energetics of the mouldings cycles allowed an optimization of the process parameters in order to better control energy consumption during the production for an equivalent part quality see better
Nguyen-Thuc, Boi Huyen. "Etude rhéocinétique et mécanique des réseaux époxydes modifiés par des élastomères : mise en forme par le procédé de moulage par transfert de résine (RTM)". Lyon, INSA, 2003. http://theses.insa-lyon.fr/publication/2003ISAL0014/these.pdf.
The purpose of this work was the modification of an epoxy/amine system by incorporation of elastomers (reactive liquid or prefomed particles). The presence of the carboxyl functionalized group in the shell led to the modification of the dispersion state of rubber particles in the matrice. A divergence in viscosity at low shear rate occurred in the system based on functionalized core-shell particles, exhibiting significant non-Newtonian behavior. The modeling in G’ and G’’ master curves was applied using the Palierne model. A secondary plateau occurred in the elastic master curve. A modification of the morphological, rheological and dielectric behavior of epoxy systems was demonstrated by adding rubber particles induced the nature of elastomers. Composite materials were performed using the resin transfer molding process (RTM). An increase in toughness of epoxy modified with two kinds of elastomers demonstrated significant synergistic effects. The rubber blend gave higher values in viscosity and mechanical properties than using one type of rubber. The fracture mechanism of this system was plastic deformation caused by shear yielding led to particles cavitation
Ayad, Ghassane. "Contribution à l'optimisation multi-physiques et multi-étapes du moulage par injection de poudres". Besançon, 2006. http://www.theses.fr/2006BESA2040.
Menio, Stéphane. "Optimisation du moulage par injection des composites BMC : relations écoulement - structure - état de surface". Lille 1, 2000. http://www.theses.fr/2000LIL10101.
El, Otmani Rabie. "Étude du refroidissement d'un polymère chaud sur une paroi métallique froide : influence des paramètres d'interfaces : application à l'injection des polymères". Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0060/these.pdf.
In the polymer processing industry, it's well established that the process conditions influence strongly the quality and final part properties. The numerical simulation of all the process is then necessary to optimise and understand the interaction between the process, the material properties and structure. In the injection moulding process, one numerical difficulty concerns the exact polymer-air front tracking during the filling step. The exact determination of the interfaces is needed to describe precisely the velocity fields, the pressure distribution and the fountain flow phenomena. The two aims of this work are then : i-development of a numerical model describing the non-isothermal flow of non-Newtonian fluids as in the filling stage in the injection molding process. Ii-apply the model to study the mold-polymer interfaces interaction, and to understand the effect of several molding parameters. First, we have proposed a penalty correction for the level set method, in order to ensure the mass conservation. After its validation in various configurations, the method is then introduced in a numerical simulation of a non-Newtonian, non isothermal flow in a rectangular cavity. A strong coupling between the energy, continuity, Navier-Stokes and level-set equations is made in order to describe the polymer behaviour in the mold. A finite Elements Method is used to solve the multiphysics problem. The results show clearly the fountain flow phenomenon. Temperature, pressure, velocity profiles and viscosity evolution are calculated and the influence of the contact thermal resistance between the metallic mold and the moving polymer interface is investigated for different injection molding conditions
Farouq, Youssef. "Analyse du comportement thermique et dimensionnel des pièces moulées par injection". Nantes, 2006. http://www.theses.fr/2006NANT2037.
Heat exchange during the polymer injection moulding process, have a great influence on the physical and dimensional properties of the moulded products. Injection technology development is limited by the lack of knowledge of the thermal behavior of polymers. A better appreciation of the real state of the matter makes it possible to optimize the cycle times by an opening of the mould at the convenient moment. This knowledge is essential to improve the productivity and quality of the parts. At the ejection, the knowledge of the thermal field makes it possible to apprehend the dimensional evolution of the plastic parts. The forecast of the thermal fields during the cycle of moulding and after the release from the mould opens a broad field of investigation. In this study, we analyze the thermal and dimensional behavior from the end of filling stage to the complete cooling of the moulded parts of polystyrene and polypropylene using a in-situ measurement of the temperature in the depth and at the surface of the part and a dimensional measurement after the ejection phase. In chapter I, we present the thermal phenomena occuring in the injection process and the defects of moulded parts due to warping and the shrinkage. Chapter II shows the experimental device used for the direct measurement of the temperature during the moulding cycle and after release from the mould, as well as the dimensional measurement during the cooling phase out of the mould. Chapter III deals with the description of the thermal models used in this study. Confrontation between calculation and the experiment makes it possible to validate the assumptions emitted on the thermal phenomena observed in experiments during the process of injection. The results of this comparison are covered in chapter IV. The chapter V presents the results obtained using the device allowing the measurement of the thermal and dimensional evolution of the injected parts and their interpretation
Van, Den Broek D'Obrenan Ghislain. "Adaptation du procédé RTM (Moulage par Transfert de Résine) à la mise en œuvre de matériaux composites à matrice thermoplastique". Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00715806.
Van, den Broek d'Obrenan Ghislain. "Adaptation du procédé RTM (Moulage par Transfert de Résine) à la mise en œuvre de matériaux composites à matrice thermoplastique". Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0112/document.
The "Resin Transfer Molding" (RTM) process is very largely used for the industrial production of composites materials with thermoset matrix. Indeed, it’s used by many fields such as the automotive and aeronautics. In this work we adapted this process to the manufacture of composite materials with thermoplastic matrix in order to answer the ecological and economic criteria imposed on industries. For that several steps were necessary. The first was the selection of a robust chemistry, adapted to the requirements of the process (low initial viscosity of the reactive system, polymerization time, etc). The selected chemistry, was the ring opening polymerization of ε - caprolactam to obtain polyamide-6 (PA-6). Rhéo-kinetics studies, as well as the physicochemical characterizations of a Pa-6 obtained at the laboratory were carried out. Following this step, tests in conditions of process were carried out with the use of dedicated pilot equipment. These tests were the source of modifications and optimizations of certain parameters of the process. The third step, consisted with the production of composite parts with a reinforcement of the type: unidirectional glass fabric. This production was followed mechanical and physico-chemical tests in order to evaluate the properties of these parts. Various sizing of the glass fabric were studied with, for objective, to determine which to offer the best properties. During this study we observed the low impact of the sizing on the chemistry of PA-6. To finish, we set up a reactive sizing which will allow a better interaction fibre/matrix
Geneau, Céline. "Procédé d'élaboration d'agromatériau composite naturel par extrusion bivis et injection moulage de tourteau de tournesol". Toulouse, INPT, 2006. http://ethesis.inp-toulouse.fr/archive/00000325/.
Geneau, Céline Silvestre Françoise Rigal Luc. "Procédé d'élaboration d'agromatériau composite naturel par extrusion bivis et injection moulage de tourteau de tournesol". Toulouse : INP Toulouse, 2006. http://ethesis.inp-toulouse.fr/archive/00000325.
Auscher, Marie-Camille. "Dispersion de particules de zircone dans les polyoléfines : rhéologie et application au moulage par injection céramique". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1177.
This work aims to investigate the relevant mechanisms controlling the linear and non-linear flow behaviors and dispersion state of molten polymers filled with submicrometer particles. The fundamental understanding is then applied to the Ceramic Injection Molding process, during which a feedstock (i.e., a complex polymer based formulation, highly filled with ceramic particles) is injected into a mold, debinded and sintered. A first chapter presents the key features of the process, a state of the art of the understanding of the involved mechanisms and more generally the interplaying interaction forces in filled polymers. Then, the study focuses on zirconia filled polyethylene. Firstly, the role of the filler-matrix interface in the rheological and morphological properties is discussed. It is shown that they are strongly influenced by the compatibility of the filler with the matrix. An experimental method is developed to adjust the interface quality. In particular, stearic acid is determined to be the most efficient surfactant. The kinetics of particles hydrophobization induced by the esterification is analyzed. Then, the dispersion mechanisms in filled polymers are explored. For instance, it is concluded that stearic acid and the high shear extruder promote the rupture and erosion of agglomerates. Their effects on the rheological behavior (i.e., percolation threshold, yield stress and dynamic storage modulus) are discussed. Finally, the stability of filled polymers, i.e., tendency to flocculation and filler-matrix segregation, is evaluated at rest and under high shear rates. Two experimental methods are developed for this more applied study. The crucial role of the dispersion state is for instance highlighted
Gamon, Guillaume. "Incorporation de fibres végétales dans des matrices thermoplastiques biosourcées et biodégradables par extrusion bi-vis pour la production de matériaux biocomposites moulés par injection". Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2013INPT0029.
Incorporation of vegetal fibres, differing by their source, their chemical composition and their shape, have been performed by twin screw extrusion in two thermoplastic matrices: the poly(lactic acid) and the thermoplastified wheat flour. These two biobased and biodegradable matrices have also different chemical character and thermo-mechanical properties. Fibre incorporation up to 40 % in weight considerably modified both matrix properties and improved several weaknesses (thermal stability, lack of stiffness…). Miscanthus fibres have been selected as best improvers for properties of both matrices. Materials properties were adjusted with a formulating work (addition of plasticizers) and whole process optimization, until injection-molding. Fibre incorporation in a compatibilized blend of the two matrices was also tested and performed in a one step extrusion process, including flour thermoplasticization, polymer blending and fibre dispersion
Wesselmann, Matthias. "Influence des conditions de mise en oeuvre sur les caractéristiques des pièces injectées en composites à matrice thermostable renforcée de fibres de verre courtes". Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1167.
Redko, Vadym. "Développement d'un algorithme numérique pour l'identification in-situ du champ de perméabilités d'une préforme fibreuse par une méthode inverse". Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10202.
In the Resin Transfert Molding process used to manufacture high performance composite structures, the fibrous preform impregnation by resin largely determines the piece quality. Numerical simulation is widely used in order to adress the issue of manufacturing defects. It is necessary to know material charasteristics of preform such as perméability which is the most important one. Generally, the preform permeability is obtained by an experimental measurement having a large variability. Therefore, reliable numerical techniques are being looked for. This PhD thesis aims to develop a numerical algorithm by inverse method to identify in-situ the permeability field. The performance of the method is shown by validation of three study cases. The developped algorithm allows to identify isotropic and anisotropic permeability as well as to detect the race tracking effect. In a future work, this numerical algorithm will be implemented in an on-line control system to optimize the mold filling process
Marie, Stéphane. "Un modèle de parallélisation S. P. M. D. : pour la simulation numérique de procèdes de mise en forme de matériaux". ENSMP, 1997. http://www.theses.fr/1997ENMP0762.
We submit a simple and efficient S. P. M. D. Paradigm for the numerical 3-D simulation in material forming processing. The constitutive equations used in the forming process of metal forging, polymer extrusion and injection, lead to the resolution of generalized Stokes- like problems. We solve the equations by a stable and mixed velocity/pressure finite element method with the popular "mini-element" which leads to the resolution of indefinite symmetric systems. We have developped a robust and efficient iterative method for solving these systems. The minimal residual method with block diagonal preconditioning, minimizes both CPU time and memory storage. With the iterative solver, we adopt an efficient S. P. M. D. Parallelization paradigm for all the three material forming simulation codes. We base the parallelization on a data decomposition realized with a mesh partition and on the update of the global data of the solver. Within the same strategy, for parallel remeshing, we use the same sequential version on each sub-domain, without changing the interface. Then we make a repartitioning to equilibrate the loading balance between processors and to move interfaces, which can then be remeshed. In the injection simulation code, to parallelize the fluid transport equation, we add some data on each domain by recovering neighboring elements. We give some results of industrial simulations on clusters of workstations and on distributed parallel platforms. The parallel S. P. M. D. Strategy used with the iterative solver shows great advantages for CPU time and memory storage. This broadens the industrial application field of 3-D simulation in metal forging, polymer extrusion and polymer injection processes
Moguedet, Maël. "Développement d'un outil d'aide à la conception et au fonctionnement d'un ensemble vis-fourreau industriel : application à l'injection des thermoplastiques chargés de fibres de verre longues". Lyon, INSA, 2005. http://theses.insa-lyon.fr/publication/2005ISAL0126/these.pdf.
For a European project dealing with injection-moulding of long glass fibre reinforced thermoplastics (LGFRT), plasticizing of these materials in a barrel-screw unit is studied according to two different research axes: On one hand, final fibre length distributions are predicted, directly comparable to experimental ones, coupling a plasticizing model to a fibre breakage criterion at the solid/melt interface. One the other hand, flows in the metering zone of the screw are described in terms of velocities, shear rates, trajectories, residence time distribution and mixing efficiency. We developed first a new model describing flows in the screw channel, which takes into account the real geometry of the channel (curvature and torsion). Secondly, we built an innovative transparent barrel/screw device that gives us the means to visualize and measure the 3D position of a particle moving in a silicon oil, in the screw channel. Finally, simulated and experimental trajectories are compared
Sobotka, Vincent. "Optimisation thermique du procédé Resin Transfer Molding". Nantes, 2004. http://www.theses.fr/2004NANT2094.
Structural composite materials manufactured with continuous reinforcement (either woven or long fibers) are more and more used, notably in the car industries, aeronautical, nautical and sports domains. The Resin Transfer Molding process is a process of composite part manufacture adapted to average production corresponding more and more to those met in car industries. Besides, this process complies with the environmental requirements of solvent release, molding being achieved in closed mold. This work achieved within the framework of the Programs of Research and Innovation in Ground Transport (PREDIT) of the Ministry of National Education associated several academic and industrial partners. It concerned the thermal characterization of composite materials made of unsaturated polyester and glass reinforcements, as well as their transformation. Experimental analyses were carried out by in-situ measures as well as the modelling of the heat transfer in the process. Some new models have been developed and have been validated. A first illustration of a methodology of thermal optimization of the process has been shown
Moguedet, Maël Charmeau Jean-Yves Béreaux Yves. "Développement d'un outil d'aide à la conception et au fonctionnement d'un ensemble vis-fourreau industriel application à l'injection des thermoplastiques chargés de fibres de verre longues /". Villeurbanne : Doc'INSA, 2007. http://docinsa.insa-lyon.fr/these/pont.php?id=moguedet.
Willien, Jean-Luc. "Modélisation surfacique du remplissage de moules en injection des thermoplastiques". Paris, ENMP, 1992. http://www.theses.fr/1992ENMP0338.
Tourneroche, Paul. "Développement de mélanges chargés en poudres d'aluminure de titane pour moulage par injection et applications aéronautiques". Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2057.
Reducing the ecological footprint of human activities is, today, the aim of most of the research programs. In Europe, the « Clean Sky » project funds research activities to make air transport « greener ». This PhD, being part of it, is about improving production of Titanium Aluminide based components. Nowadays production having a strong environmental impact, an alternative way has been investigated: metal injection molding. The first step of this work was focused on a bibliographic study, to select relevant, common and innovative mixtures to be used in the process. Throughout the process, these mixtures have been tested, physically and chemically analyzed, to get data about the optimal mixture. Several components geometries have been tested, during injection, debinding, and sintering steps. Once the mixture(s) chosen, process’ parameters have been optimized to make industrial transfer easier, and lower its overall cost. The developments achieved during this PhD led to two qualified mixtures, and optimized mixing, molding, debinding and sintering steps
Benoit-Cervantes, Géraldine. "Rheologie du moulage par injection d'une piece technique en thermoplastique renforce de fibres de verre courtes". Paris 6, 1997. http://www.theses.fr/1997PA066024.
Ou, Huibin. "Modélisation multi-physiques et simulations numériques du moulage par injection mono et bi matières thermoplastique / silicone liquide". Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2001/document.
The family of high technology silicone elastomers LSR (Liquid Silicone Rubber) is identified as having the strongest arguments for development in the coming decades due to their unique properties and easy forming in large series. In particular, the injection molding of LSR on other materials such as thermoplastics or metals is possible today, which opens the possibility of obtaining multi-material, multi-color and new features components. The work presented in this thesis focuses on the transformation of silicone elastomers in order to better understand the phenomena involved, as to improve production processes and optimize processing conditions for mono or bi-material components in geometry and property functional well defined. The rheological, curing kinetic and thermal behaviors of silicone elastomers have been studied and characterized under real conditions of production by different methods combined. A thermo-rheo-kinetic model was then developed and implemented in commercial computer software Cadmould® to simulate the injection molding process of LSR or the overmolding process of LSR on to thermoplastics. For the validation of the models chosen and the parameters identified, the injection molding tests on industrial instrumented tools were performed and compared to numerical results. Finally, the characterization of interfacial adhesion between the thermoplastic and silicone elastomers was carried out under various adhesion tests. Moreover, the evolution of interfacial adhesion in thermoplastic/silicone components during the vulcanization of silicone elastomers has been characterized by the tensile test using a rotating rheometer in different heating cycles
Faucher, Anne-Laure. "Apport de la simulation numérique à la conception des semelages : application à l'injection des semelles en élastomères thermoplastiques et au surmoulage". Saint-Etienne, 2004. http://www.theses.fr/2004STET4021.
Miled, Houssem Eddine. "Modélisation de l'orientation de fibres induite par l'écoulement et comportement élastique anisotrope à l'état solide". Paris, ENMP, 2010. http://www.theses.fr/2010ENMP0078.
The ame of this Phd is first to describe numerical techniques to predict fiber orientation during injection moulding of fiber reinforced polymers, and how the resulting part behaves regarding this process induced orientation. Some orientation models were summarized, and one model "Folgar and Tucker's equation" was considered for the description of fiber orientation. After injection process and solidification, our approach consider that the part has an anisotropic thermo-elastic behaviour. This behaviour is linked to the fiber orientation and, matrix and fibers properties. The prediction of this behaviour was carried out numerically and analytically and the two approaches was compared
Dreyer, Jean-Luc. "Le compactage des matières plastiques en injection assistée par gaz". Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/DREYER_Jean-Luc_2010.pdf.
The gas assisted injection moulding is a process commonly implemented to save material while creating a cavity in a plastic part. In cases of more complex applications, it can happen that two or more bubbles are brought to merge. For a long time, this connection was considered as impossible. In some special configurations this phenomena can be provoked and its perfectly repeatable. This connection allows a homogeneous field of pressure thus diminating internal constraints due to pressure gradient. Besides, it becomes possible to control the polymer shrinkage while modifying simply the nitrogen pressure level
Hidalgo, Garcia Javier. "Development of binder systems based on CAB for powder injection moulding (PIM) and micro powder injection moulding (µ-PIM) of Zircon and Invar powders". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2043/document.
This PhD Thesis studied the use of binders based on cellulose acetate butyrate (CAB) andpoly(ethylene glycol) (PEG) in different type of materials, including a ceramic, the zirconiumsilicate, and a metallic alloy, the Invar 36. These materials share their low dimensionalstability with temperature with low coefficients of thermal expansion.The scope of this work is the study and comprehension of the behaviour of the mentionedbinder systems when they are employed in different PIM processes and under differentconditions and powder-types. With regard to this matter, different formulations were designedwith several types of PEG and CAB. These formulations were compared with commercialones. The intrinsic characteristics of each CAB were linked with the behaviour of the differentfeedstock also containing PEG and powder particles. The mixtures homogeneity, the optimumand critical solid loading and its flowability were assessed by torque and capillary rheology.Other complementary techniques such as electronic and light microscopy or the measurementof the mixtures densities by pycnometry were carried out to contrast rheology results. Thecompatibility between the feedstocks’ components and their thermal behaviour were analysedby calorimetry and thermogravimetry techniques. These methods were employed by the firsttime to determine the optimal solid loading.The optimal compositions were injected by using low or high pressures or by a micro injectionmoulding process. The debinding and sintering stages were optimised using severalatmospheres. Finally, the physical and mechanical properties of the final consolidated partswere measured.It could be concluded that the studied binder systems based on PEG and CAB presentedsuitable characteristics for PIM, providing improvements with respect to conventional bindersystems and by a more environmental friendly processing. However, that doctoral work wasjust a first approach to the use of these types of binder systems in PIM. Along this workseveral issues were detected and some topics regarding the processing should be furtherinvestigated to obtain the best of these binder systems
Pierre, Nathalie. "Procédé d'injection-moulage : relations entre la phase de plastification et les propriétés des objets finis". Lyon 1, 2000. http://www.theses.fr/2000LYO10295.
Riou, Marcel. "Étude de l'effet des colorants sur les propriétés d'un thermoplastique, volume 1 /". Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1987. http://theses.uqac.ca.
Massé, Hugues. "Couplages thermomécaniques lors de la solidification de matériaux polymères". Bordeaux 1, 2000. http://www.theses.fr/2000BOR12318.
Esposito, Antonella. "Visualization of the flow in a screw / barrel system. Real-time monitoring of polymer / clay mixing". Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0124/these.pdf.
L'addition de nanocharges aux polymères fondus en améliore les propriétés si elle sont parfaitement désagglomérées, dispersées et distribuées dans la matrice. Les charges lamellaires et leur nanocomposites attirent depuis quelque temps une attention croissante, tant de la part du monde académique que de l'industrie, imposant ainsi des critères d'homogénéité du mélange polymère/charges plus stricts et multiéchelle. La morphologie des nanocomposites à base de charges lamellaires est difficile à caractériser et presque autant difficile à décrire, à cause des problèmes de dispersion et/ou distribution. Une nouvelle méthode pour le suivi en ligne des évolutions morphologiques des mélanges polymère/argile lors du procédé de mise en oeuvre pourrait contribuer de façon significative au développement et à la commercialisation des nanocomposites. L'objectif de ce travail est de poser les bases pour le développement d'une méthode de caractérisation morphologique qui puisse mettre en évidence et comprendre les mécanismes de dispersion/distribution de charges dans un milieu visqueux (polymère thermoplastique fondu ou résine thermodurcissable non réticulée) en écoulement dans un système à géométrie complexe (zone de pompage des ensemble vis/fourreau pour l'extrusion et l'injection). Nous avons repris une maquette froide (Visiovis) assemblée auparavant dans le laboratoire du Site de Plasturgie à Oyonnax, présentant l'avantage considérable d'être constituée d'un fourreau entièrement transparent, et nous l'avons adaptée à la visualisation du mélange d'un polymère modèle (PDMS) avec des argiles commerciales préalablement photo-fonctionnalisées par échange cationique avec un fluorophore
Binétruy, Christophe. "Calcul et validation expérimentale de la perméabilité et prévision de l'imprégnation de tissus en moulage RTM". Lille 1, 1996. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1996/50376-1996-178.pdf.
Nguyen, Van-Hau. "Characterization and modeling of flax fiber reinforced composites manufacturing by resin transfer molding process". Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10156.
This thesis presents an experimental characterization of flax fiber and a modeling of the resin flow during the resin transfer molding process with flax preform. The change of diameter of flax fiber filament immersed in different test liquids was characterized using optical microscope. The sorption rate of the resin mass into the fiber filament immersed in the test liquids was also experimentally characterized using centrifuge test. A new permeability model was proposed to predict the permeability taking into account the fiber swell effect, regardless of test liquid and the model was validated by a comparison with the experimental measurement data. The wetting properties of flax fiber in contact with different test liquids were measured by capillary rise test using flax fiber yarn and a new model was established to obtain surface tension and contact angle by considering the fiber swell effect and the liquid sorption into the fiber filament. The unsaturated resin flow in the flax fiber preform was modeled by modifying the conventional mass conservation equation and Darcy’s law in order to take into account the effects of fiber swell and liquid sorption. The mass rate absorbed into the fiber and the change of fiber volume were considered as sink terms in the mass conservation equation. The permeability change due to the fiber swell was modeled in terms of time of fiber’s immersion in liquid. In particular, the sink term and permeability were considered as spatially and temporally non-uniform in the flow model. The proposed model was validated by a comparison with the experimental measurement of flow advancement in the flax fiber preform
Benali, Samira Maazouz Abderrahim Dupuy Jérôme. "Etude cinétique et rhéologique de systèmes polyuréthanes application au suivi in-situ du procédé RIM /". Villeurbanne : Doc'INSA, 2005. http://docinsa.insa-lyon.fr/these/pont.php?id=benali.
Saint-Martin, Gilles. "Etude typologique des défauts structuraux générés au cours de la mise en forme par injection de composites à matrice polymère thermostable renforcés par fibres de verre courtes". Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1146.