Дисертації з теми "Procédé de fabrication des pneumatiques"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Procédé de fabrication des pneumatiques".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Roca, Filella Nicolas. "Contributions à la robotisation de tâches entrant dans la fabrication de pneumatiques." Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2023. http://www.theses.fr/2023UCFA0011.
Повний текст джерелаRobotics research is increasingly interested in the manipulation of soft objects: fabrics, foams or any other deformable object like rubber. The deformation of such an object is usually modeled by introducing new degrees of freedom, which makes its control more complex. In the context of the industry of the future, the Manufacture Française des Pneumatiques Michelin wishes to modernize its tire manufacturing process which consists of assembling, layer by layer, strips and plies of rubber. These tasks, which have never been robotized before this thesis, fall within the domain of robotic manipulation of deformable objects (RMDO).Through the CIFRE plan (French Industrial Research Training Convention) of the ANRT (French National Association for Technological Research), this thesis addresses this issue in an industrial application context through the design of a robotic cell by providing innovative technological solutions, especially in terms of actuation, perception, and control. However, we show that the integration of these solutions is limited by classical problems of RMDO, such as the modeling of object deformations, multimodal perception or dynamic control and generation of tasks.A first contribution is the adaptation of image processing algorithms from open-source libraries to an industrial context. These algorithms replace commercial industrial solutions and allow a greater freedom of parameterization for each function. The result is an assembly of flexible algorithmic bricks adapted to the specificities of the tire manufacturing process.This thesis also explores the use of a reduced physical model to control the tension in a suspended gum strip, one end of which is wrapped around a spool while the other is manipulated by a robot. We distinguish three contributions: vision-based estimation of the tension, a closed-loop control law to regulate the rotation speed of the reel and thus vary the length of the suspended part of the strip, and a planning algorithm to achieve the desired tension.A last contribution concerns a visual feedback control allowing to join end to end the two ends of a web wrapped around a cylindrical surface. This complex operation is based on visual perception and 3D reconstruction of the edge of the ply as well as a control law considering a weighted measure of the error.Our developments have enabled the design and production of an industrial demonstrator that is ready for deployment in a factory. This means that industrial constraints such as sizing, cycle time, available hardware and software architecture, and quality tolerances have been considered from the beginning of the scientific reflection. Experimental validations were carried out on this test bench
Trouvain, Guillaume. "Evolution des outils de simulation rapide du procédé de fabrication du pneumatique avant cuisson." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22546/document.
Повний текст джерелаThis thesis deals with fast simulation tools used to manufacture of a tire. The goal is to predict the displacement and position of the components of a tire taking into account the deformations induced by the associated mechanical actions. This work is based on the implementation of an algorithm for modeling the inflation of a tool and the development of a deformation model in order to compute the deformation of geometric shapes taking into account different mechanical properties. The algorithm to model the inflation of the tool is based on the theory of inextensible membranes and its industrialization is validated for standard sizes of tires. Mass-Spring method is used to achieve the deformation of geometric shapes in order to compute deformation in real time. In this work, this method is suitable for materials of a tire from geometric and mechanical characterizations validated by comparison with FEM. To conclude, the developed modelization allows a description for each step of the manufacturing process
Béraud, Nicolas. "Fabrication assistée par ordinateur pour le procédé EBM." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI052/document.
Повний текст джерелаThe Electron Beam Melting (EBM) process allows to build metallic parts from powder. Thanks to the geometric and mechanical quality of the parts produced, the EBM process can be used to manufacture functional parts and not only prototypes. This process, with other additive metallic processes, make it possible to consider a transition from 3D printing to metallic additive manufacturing.The use of additive manufacturing in an industrial environment requires compliance with quality, cost and time criteria for the parts produced. The production of manufactured parts involves a series of numerical stages which is called the numerical chain. The numerical chain has a significant impact on the three criteria mentioned above. Thus, this thesis provides an answer to the following question:How Computer Aided Manufacturing can improve the quality, cost and time of the EBM manufacturing process?This problem is addressed through the following underlying question:What are the required characteristics for a Computer Aided Manufacturing system adapted to the EBM process?In order to answer this question, the current numerical chain is analyzed. Three main limitations are found:- the use of STL files format- the process cannot be optimized at different scales- the process cannot be simulatedTo solve these issues, a CAM environment is proposed. It allows the centralization of all numerical operations in a single environment. All supported formats can be used within this environment, such as native CAD file formats or STEP format. Software developments are done to prove the feasibility of such an environment.The CAM environment implementation reveals the crucial role of simulation in this system. It is therefore necessary to answer this second question:How to obtain an EBM process simulation allowing the development of parameters, virtually?Although EBM simulation is a recurrent subject in scientific literature, existing studies are based on the finite elements method but the calculation time needed is too important to be used in an CAM environment. Thus, an alternative type of simulation is created in this thesis: a simulation based on abacus. It is composed of a finite elements model, that allows heat maps generation for standards cases of heating and cooling. These heat maps are then transformed in abacus. The simulation algorithm based on abacus search the nearest abacus from the simulated situation in order to estimate the temperatures at the next time step.This simulation method was used to reduce the calculation time while keeping a sufficient precision to optimize process parameters.With the simulation based on abacus, a tool for the optimization of melting strategies is developed. This tool allows quality improvement for the produced parts through the calculation of melting strategies according to thermic criteria.To summarize, the main contributions of this work are:- the definition of requirements specifications of a powerful numerical chain for the EBM process- the development of a CAM environment adapted to the EBM process- the proposal of a fast simulation for the EBM process, based on abacus- the development of a tool for the optimization of melting strategies
Langlois, Pierre L. "Développement d'un procédé de fabrication de transistors en technologie MESFET." Mémoire, Université de Sherbrooke, 2004. http://savoirs.usherbrooke.ca/handle/11143/1232.
Повний текст джерелаRobert, Pascal. "Conception et fabrication de pièces métalliques intelligentes par procédé WAAM." Thesis, Université Grenoble Alpes, 2022. http://www.theses.fr/2022GRALI055.
Повний текст джерелаIndustry 4.0 highlights the need for massive data collection and therefore relies partly on the use of smart parts that are capable of providing data when they are used. In addition, metal additive manufacturing technologies seem to be a way to easily make smart parts and particularly the Wire & Arc Additive Manufacturing (WAAM) process that uses arc-welding technology. This raises the following issue, how to manufacture and design a smart metal part by WAAM? The research scope is limited to stress measurement in aluminum parts. In order to answer this problem, four scientific issues are identified and resolved in this manuscript:• The integration of a sensing technology within a part requires the part to be massive (composed of juxtaposed beads). Thus, making massive parts in aluminum is the first scientific challenge to resolve. Manufacturing parameters of the WAAM process are listed and explained in the state of the art. Wetting, regularity and mass energy of a bead are identified as indicators of the suitability of the selected parameters to be used to produce sound massive parts. Experimental campaigns are conducted to select parameters not identified by the state of the art to produce a wetted bead with low mass energy. Blocks are made and specimens are extracted then their mechanical characteristics are determined by tensile test in order to validate the selected parameters.• The second scientific challenge identified is to correctly choose the stress measurement technology to be inserted. Many devices that can be inserted during the WAAM process but also selection methods are reviewed in the bibliographic chapter. A synthesis in four families of strain measurement technologies relevant for the insertion during the WAAM process is therefore proposed. A selection guide based on evaluation criteria, on the knowledge of these technologies and on the specifications of parts to design as smart parts is proposed. Control by induction of an embedded magnetostrictive stress indicator is the most promising technology according to the proposed guide. This technology is used in the rest of the study.• The third challenge is to make the smart part manufacturable with the selected sensing technology. This technology requires the insertion of a thin steel indicator within the aluminum host part. In order to demonstrate its feasibility, various parameters (indicator’s coating, trajectory of the welding torch) are explored during experimental campaigns. Samples produced are analyzed by tomography. Thickness maps of the indicator are thus produced and allow to evaluate their deterioration. Scanning electron microscopy analysis of the intermetallic layer shows the fusion between the indicator and the host part and thus the feasibility of producing a smart part.• Finally, to realize a smart part with this technology, the last challenge is the choice of the indicator location in the part so that it reports the evolution of the stress in this one. Thus, recommendations for the selection of the mechanical characteristics of the indicator were formulated using the analysis of its magnetostrictive behavior and its mechanical coupling to its environment. Then, a method of placing the indicator for the measurement of the part maximum stress based on finite element simulations is presented for four distinct measurement scenarios.All the studies carried out allow to conclude on the interest of the use of the WAAM process for the production of smart parts
Muhr, Laurence. "Étude du procédé de fabrication des graisses au lithium complexe." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL151N.
Повний текст джерелаSchmitt, François. "Méthodes et procédés pour l'assistance à la chirurgie laparoscopique par comanipulation." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAD033.
Повний текст джерелаThe context of this work is the development of tools in order to improve the tissues stiffness perception for cobot-assisted laparoscopic surgery. During manual procedures, this perception is distorted, notably by the fulcrum effect, due to the kinematic constraints induced by the trocar. This thesis is developed in two parts. In a first part, we study the fulcrum effect and how it distorts the perception of a user manipulating the tool in collaboration with a robot. From this model, we propose a strategy in order to compensate for this distortion. A validation experiment for this strategy is then proposed. In a second part, we discuss the design of a new architecture with RCM kinematics, integrating both structure and actuation for lightweight robotic applications. In this context, we present an approach to design articulated origami systems, manufactured using multi-material processes
Pattofatto, Stéphane. "Comportement dynamique du béton frais : application au procédé de fabrication des parpaings." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2004. http://tel.archives-ouvertes.fr/tel-00133659.
Повний текст джерелаRadu, Jorj. "La mise au point d'un procédé de fabrication d'un cidre de glace." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ46629.pdf.
Повний текст джерелаKpogbemabou, David. "Procédé de fabrication de biocarburants à partir de biomasse lignocellulosique biologiquement destructurée." Poitiers, 2011. http://nuxeo.edel.univ-poitiers.fr/nuxeo/site/esupversions/7fd615c5-8c38-410c-b7cc-cb5b1011ea0a.
Повний текст джерелаThe use of fossil carbon for energy is a major cause of emission of greenhouse gas emissions. The use of alternative energy sources such as biofuels can reduce these emissions. The second-generation biofuels is an interesting step but requires an important hydrogen consuming for hydrodeoxygenation step. The objective of this work was to develop lignocellulosic biomass by an original process combining biochemical conversions (decomposition of organic matter) and thermochemical (catalytic hydroliquefaction). Organic matter was characterized during the decomposition step by physico-chemical techniques (DRIFTS, DTA / TGA), as well as by molecular using mass spectrometry (headspace, pyrolysis, thermochemolysis). The study of lipid biomarkers showed that the biological activity is changing rapidly before stabilizing around 36 days. Lignocellulosic biomass has been converted into bio-oil by catalytic hydroliquefaction. The temperature and reaction time were optimized. The influence of the solvent, the catalyst and the decomposition were studied. The chemical fractionation (IHSS) has highlighted the important part of the refractory fraction, the "humin". This fraction appears to be most interesting for liquefaction in terms of quantity and quality of bio-oil formed
Luc, Guillaume. "Ingénierie tissulaire : Mise en oeuvre d’un procédé de fabrication d’une matrice oesophagienne biologique." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0423/document.
Повний текст джерелаDecellularized matrixes (DM) are commonly used to facilitate a constructive remodeling response in several types of tissue, including the esophagus. Surgical procedure of the esophagus is often complicated by stricture, but preclinical studies have shown that the use of a DM can mitigate stricture and promote a constructive outcome. Recognizing the potential benefits of DM derived from homologous tissue (i.e., site-specific ECM), the objective of the present study was to prepare, characterize, and assess the in-vivo remodeling properties of DM from porcine esophagus. The developed protocol for esophageal DM preparation is compliant with previously established criteria of decellularization and results in a scaffold that maintains important biologic components and an ultrastructure consistent with a good mechanical behavior. Stem cells remained viable when seeded upon the esophageal DM in vitro, and the in-vivo host response showed a pattern of constructive remodeling when implanted in soft tissue
El, youssef Mohamad. "Impact du procédé de fabrication des stators slinky sur les propriétés des matériaux." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0067/document.
Повний текст джерелаThe synchronous claw pole machine represents a widely used device, as an alternator, in the automobile industry. The production of this machine implements a line of several processes which impact the characteristics of ferromagnetic materials and, ultimately, the performance of the alternator. Therefore, this work is devoted to studying the impact of the manufacturing processes of a Slinky stator (based on a rolled sheet metal strip rather than stacked sheets) on the magnetic properties. To reach our goal, a first task consists in quantifying the impact of each manufacturing process. The aim is to separate the most detrimental processes. Thus, a magnetic measurement campaign was carried out on samples withdrawn before and after each process.The results show that the rolling step represents the most detrimental process due to the generated stresses and strains in the plane of the sheet in both modes (tension and compression). Therefore, the optimization of this process requires setting up the link between the mechanical and magnetic properties. Hence, we propose a new method of magneto-mechanical characterization. It enables to carry out magnetic measurements under uniaxial loading (tension and compression). Finally, we present results showing the evolution of the magnetic behavior of a FeSi NO material depending on the applied stress and strain
Perdu, Emmanuelle. "Contribution à la mise en route d'un procédé de fabrication sous isolateur stérile." Paris 5, 1989. http://www.theses.fr/1989PA05P165.
Повний текст джерелаBône, Stéphane. "Étude d'un procédé de fabrication de microcapsules par émulsification dans un mélangeur statique." Nantes, 2005. http://www.theses.fr/2005NANT2140.
Повний текст джерелаThe main objective of this work is to show the feasibility and to scale up a new process of hydrogel beads formulation by SMX Static mixer. The droplet cooling and breaking take place at the same time which avoid the use of a secondary step to control the temperature. Then, the energy consumption is lower but the process running is tricky. However, we have shown that a good understanding of main phenomena allows the control of the process in term of beads size distribution. A predictive tool, “SMX – break-up” has been developed to give the user the opportunity to predict the final size of beads regarding to the process parameters : Type of fluids, temperatures, flow rate. It is based on a 1D heat transfer model which follow the temperature of the continuous and the dispersed phase through the static mixer. It is coupled with the hydrocolloid break-up kinetic, which depends of the fluid viscosities and the hydrodynamic conditions. It is not necessary to use a fitting constant for this model which allows the scale-up
Cadet, Catherine. "Modélisation et étude d'une commande automatique d'un procédé industriel d'évaporation en sucrerie de cannes." Lyon 1, 1997. http://www.theses.fr/1997LYO10189.
Повний текст джерелаNekili, Mohamed. "Synthèse de réseaux de distribution d'horloges en présence de variations du procédé de fabrication." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0023/NQ37380.pdf.
Повний текст джерелаAgogué, Romain. "Analyse expérimentale et numérique de la fabrication de pièces composites par le procédé RTM." Phd thesis, Université d'Orléans, 2011. http://tel.archives-ouvertes.fr/tel-00628046.
Повний текст джерелаMorissette, Jean-François. "Fabrication par lithographie hybride et procédé damascène de transistors monoélectroniques à grille auto-alignée." Mémoire, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/1573.
Повний текст джерелаAhmadifar, Mohammad. "Etude de la rhéologie des composites polymères au cours du procédé FDM (Fabrication additive)." Thesis, Paris, HESAM, 2021. http://www.theses.fr/2021HESAE072.
Повний текст джерелаAdditive manufacturing (AM) is a novel technology that enables rapid fabrication of physical models directly from 3D computer-aided design (CAD) data without any conventional tooling or programming requirement. Thermoplastic polymers are the most useful materials for the manufacturing of parts in the FFF process. In this process, extrusion of a semi-molten road through a nozzle is taken place to form each layer, the extruded road solidifies quickly due to the existence of temperature gradient between the surroundings and the extrusion temperature. Different key parameters affect the final products manufactured by this process. These parameters can be listed in three categories. Some of them are linked to the material, others are linked either to the characteristics of the process or to the specificity of the machine. They can influence the properties of the final part through their effect on various physical phenomena. The mentioned parameters affect the polymer temperature and its evolution. It is important to know the evolution of filaments temperature with time and recognize how it is affected by major process variables as mentioned. Due to the nature of the FFF process, it is important to measure the temperature profile and its evolution during the process by the means of local measurement methods. The idea of this work took place in 2018, by start reviewing literatures related to the FFF process. As mentioned, almost all studies and works either numerical or experimental approaches were based on global consideration. In the beginning, the work was concentrated on finding a method to be applied to the FFF process to proceed with the localized investigation. Afterward, the experiment was started to see the possibility of the work. As in the FFF process, there is a deposition of filaments, and each filament itself is heated by the deposition of newer filaments, there is almost a cyclic evolution of the temperature due to multi-layer d eposition and it means that each filament is re-heated consequently because of the deposition of a new filament. This is a critical issue in creating a filament bonding and diffusion of materials. To implement and measure this cyclic temperature, it is required to apply a measurement device in which to be capable of measuring the temperature of the polymer when leaving the nozzle. One can note that the mechanical properties of 3d-printed pieces are limited. In this work, we try to improve the mechanical properties by reinforcing the fibers such as glass fibers, carbon fibers, etc. At the same time by controlling the temperature evolution, we try to improve the adhesion between the layers to have the best structure. The used material as raw material was polyamide-6 (PA6). The main objective of this research is to study the rheological characteristics of materials during FDM/FFF to process optimization for mechanical characterization improvement of the fabricated parts. Therefore, the main objective is to take into account both the temperature and viscosity parameters, and to establish the Time-Temperature-Transformation diagram for process optimization. This helps to determine the processability area
Salles, Wendell Ferreira de la. "Sulfochloration par le chlorure de surfuryle : un procédé alternatif pour la fabrication d'alcanesulfonates secondaires." Toulouse, INPT, 2004. http://www.theses.fr/2004INPT016G.
Повний текст джерелаDefauchy, Denis. "Simulation du procédé de fabrication directe de pièces thermoplastiques par fusion laser de poudre." Phd thesis, Paris, ENSAM, 2013. http://pastel.archives-ouvertes.fr/pastel-00871731.
Повний текст джерелаMahdaoui, Omar. "Etude numérique des instabilités dans le procédé de coextrusion des polyesters." Paris, ENMP, 2008. http://tel.archives-ouvertes.fr/tel-00348802.
Повний текст джерелаThe polymer coextrusion process is a new method of sheet metal lining. It allows to substitute lacquers for steel protection in food packaging industry. It consists in extruding different polymers in the same die in order to get a multi-layer product which will provide simultaneously adhesion properties (on metal) as well as mechanical and printing properties for the coating. The coextrusion process may exhibit flow instabilities at the interface between the two polymer layers. These instabilities depend on several parameters, e. G. Processing temperatures and flow rates, differences in viscosity and elasticity. The objective of this study is to check the influence of processing and rheology parameters on the instabilities. Finite element numerical simulations of the coextrusion process allow to investigate various stable and instable flow configurations. 3D finite element computation of the whole die geometry (with only one polymer) points out that the flow is 2D both at the die entry and at the die exit, which are supposed to initiate the coextrusion defects. 2D dynamic stability analysis of the coextrusion flow points out the development of progressive waves along the die geometry. In the purely viscous case, the driving force is the Reynolds number (which is obviously very small for molten polymer flows) and the initial perturbation vanishes along the die. In the viscoelastic case, the driving force is the Weissenberg number which may be much higher than the Reynolds number. The results show that the amplitude of the progressive waves may increase or decrease, depending on the processing parameters, towards the die exit. The results are compared with experiments carried out by our industrial partner. The simulations predict surprisingly well the experimental results
Proust, Bernard. "Etude et automatisation d'un procédé de cintrage pour tubes en pyrex : application aux enseignes lumineuses." Châtenay-Malabry, Ecole centrale de Paris, 1990. http://www.theses.fr/1990ECAP0271.
Повний текст джерелаParizot, Gérald. "Étude d'un procédé de fabrication de pièces en composite verre-époxyde réticulées par haute fréquence." Nancy 1, 1999. http://www.theses.fr/1999NAN10035.
Повний текст джерелаWang, Jianfei. "Modélisation et simulation numérique d'un procédé de fabrication des mousses d'aluminium et des matériaux MPPC." Troyes, 2010. http://www.theses.fr/2010TROY0012.
Повний текст джерелаThis study is dedicated to the modeling and numerical simulation of a manufacture process of aluminum foam and porous metal polymer composite (MPPC). The proposed numerical method consists in using a system of the numeric models which apply in the hydromechanics and the thermal transfer of the flow of the molten aluminum. The object of this work is control of the parameters of manufacture, as well as to predict the defect in the material. After having studied the bibliography in this field, the second chapter of this thesis presents the experimental process of manufacture of the aluminum foam and MPPC with the method of infiltration at negative pressure. The third chapter concerns the 2D macroscopic modeling in dynamic manner. It applies a system of the numeric models. In order to modeling the infiltrative flow of molten aluminum, the conservation equations (of mass, of momentum and of energy) is applied by the model of the porous media; the multiphase model is used to follow the movement of the interface between the liquid aluminum and the air. Furthermore, the model of thermal radiation and the model of natural convection are built to determine the temperature; the model of solidification allows predicting the duration of cooling. Followed in the fourth chapter, the microscopic flow and solidification of molten aluminum are dynamically modeled by using the spherical model. Finally, in the last part, the 3D model of tetrakaidecahedron is used to observe the path and the speed of the flow of liquid aluminum
Vidal, Franck. "Rhéologie de l'induction par un fluide complexe : application au procédé de fabrication des papiers couchés." Bordeaux 1, 1992. http://www.theses.fr/1992BOR10623.
Повний текст джерелаAveryanova, Maria. "Fusion laser de poudres métalliques : Maîtrise du procédé pour la fabrication directe de pièces mécaniques." Ecole nationale d'ingénieurs (Saint-Etienne), 2011. http://www.theses.fr/2011ENISE002.
Повний текст джерелаThe study conducted in the frame of this thesis focuses on mastering of the process of Selective Laser Melting (SLM) throughout the production line: from the selection of the initial metal powder till the final control of properties (mechanical, microstructure, etc. . ). Selective Laser Melting is a complex innovative manufacturing process that requires multidisciplinary knowledge in the field of Powder Metallurgy, Process Engineering, Mechanics, Optics / Photonics, etc. From a scientific point of view, it is therefore necessary to adjust and optimize a large number of input process parameters, such as characteristics of the powder material, the machine parameters, etc. , to target a set of output parameters, to identify the influence of these input parameters and to rank them. Firstly, the influence of the nature of the powder (for 2 families of materials: 17-4 PH martensitic stainless steel and Co-Cr alloy) and its properties on the SLM process and final parts quality has been studied. Applying a material with complex metallurgy, stainless steel 17-4PH, the impact of powder key chemical elements on the properties and microstructure of the final 3D part manufactured by SLM was shown. The powder properties that encourage the manufacture of dense parts were found and formulated. Secondly, according to the inherent difficulty of many parameters affecting the process, a parametric search based on the use of methods of design of experiments was performed. A link between the geometry of the weld track and function issued from the physical parameters of the process, compared to operating parameters, was identified. Thus, a stability criterion of the weld track has been proposed. It lets us to determine quickly the optimal process parameters window, and in the case of the objective function chosen in this work, namely a maximum density, it can make 3D objects with a porosity rate below 1%. The values of mechanical properties of tensile specimens of 17-4 PH powder manufactured by SLM are the same order of magnitude as the wrought material 17-4 PH elaborated by conventional methods. Finally, it was shown that using an appropriate heat treatment the microstructure can be homogenized and mechanical properties can be improved. This work led ultimately to complete the industrialization of SLM process in two specific cases: the manufacture of dental bridges and of extrusion dies
Marzaki, Abderrezak. "Développement de technique de procédé de fabrication innovante et de nouvelle architecture de transistor MOS." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4768.
Повний текст джерелаThe component miniaturization and the circuit performance improvement are due to the progress related to the manufacturing process. Despite the number of existing technology, the CMOS technology is the most used. In the 90nm CMOS technology development, with a double poly-silicon level, the research on the introduction of innovative manufacturing process techniques and a new architecture of MOS transistor with an adjustable threshold voltage are carried out to improve the integrated circuit performances. A first study, on the peak effect implementation in the integrated circuits, particularly in the non-volatile memories is undertaken. A new process to obtain a peak effect in a material is proposed. It is shown the tunnel current gain obtained on a peak structure compared with a planar structure. A second study is focused on the development of a new patterning technique. The patterning techniques allow to reduce the photolithography dimensions without using an aggressive mask. The advantages of this new technique in terms of its implementation and the suppression of alignment problems are presented. A last study on the development of a MOS transistor with an adjustable threshold voltage is developed. It is shown the advantage of this component relative to the other components with an adjustable threshold voltage. The model implementation and the first electrical simulations of elementary circuits composed with this new component are presented. The performance improvement of some elementary circuits is demonstrated
Li, Chen. "Simulation numérique de la fabrication de composites à renfort fibreux 3D par le procédé d'infusion." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30168.
Повний текст джерелаThe manufacture of composite aeronautical structural parts requires the use of more complex reinforcements, especially the 3D reinforcements. Resin infusion is the key process of Liquid Composites Molding (LCM) which will determine the quality and cost of the parts. The target of this thesis is to develop models at different scales of fibrous network of the reinforcement and to propose a finer numerical simulation of the infusion process. The influence of the 2D and 3D reinforcement structures on the infusion process will be studied at the different scales: micro (intra-tow), meso (inter-tows) and macro (reinforcement, part)
Soppera, Olivier. "Compréhension des mécanismes de photopolymérisation de systèmes sol-gels hybrides : application à la fabrication de microéléments optiques par réticulation spatialement contrôlée." Mulhouse, 2003. http://www.theses.fr/2003MULH0712.
Повний текст джерелаHallou-Beddiar, Zoulikha. "Procédé discontinu appliqué à la synthèse des éthers couronnés." Compiègne, 1991. http://www.theses.fr/1991COMPD380.
Повний текст джерелаBouillon-Camara, Anne-Laure. "Extrapolation du procédé de granulation humide en mélangeur haute vitesse." Vandoeuvre-les-Nancy, INPL, 2005. http://docnum.univ-lorraine.fr/public/INPL/2005_BOUILLON_CAMARA_A_L.pdf.
Повний текст джерелаControlling wet granulation process scale-up is still today a challenge due to the lack of tools which could describe quite accurately the mechanisms of granule growth in high shear mixers. The well-known approach consisting in characterizing a mixing process of liquid phases with non-dimensional numbers has therefore been applied to the granular medium in the high shear mixer to establish a correlation between MiPro Pro-C-epT mixers of 3 different scales. In that frame, a method to measure the consistency of the powder has been developed. In addition, the influence of key operating variables on the granule size distributions has been studied by using a D-optimal experimental plan. The results obtained allowed to conclude that phase transitions during granulation appear at constant liquid/powder ratio whatever the scale of the mixer. Finally, the granule growth kinetic has been determined in the small scale mixer and this allowed to characterize the granule growth mechanism in small scale mixer as being mainly driven by a fragmentation-layering process
Muller, Pierre. "Fabrication additive de pièces multimatériaux." Phd thesis, Ecole centrale de nantes - ECN, 2013. http://tel.archives-ouvertes.fr/tel-00918030.
Повний текст джерелаMielcarek, Didier. "Étude et développement de méthodes d'identification multi-variables : application à un procédé chimique." Vandoeuvre-les-Nancy, INPL, 1990. http://docnum.univ-lorraine.fr/public/INPL_T_1990_MIELCAREK_D.pdf.
Повний текст джерелаGaly, Cassiopee. "Etude des interactions matériau/procédé en vue d'une optimisation des conditions opératoires du procédé de fabrication additive SLM sur des alliages d'aluminium pour des applications aéronautiques." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0106/document.
Повний текст джерелаInterest in selective laser melting (SLM) has been growing in recent years, particularly with regard to the production of metal parts.The low density of aluminum alloys, combined with the possible design optimization enabled by additive manufacturing processes,ensures a significant decrease in the mass of structures which is very interesting for manufacturers in the automotive and aerospaceindustries. However, it is difficult to control the final properties of aluminum parts manufactured by SLM because many defects, suchas porosity, hot cracking, and surface roughness, are generated during the process. To better understand how to optimize theperformance of SLM aluminium parts, several studies were conducted during this work: An identification and selection of characterization methods well-adapted to the specificities of metallic materials developedby powder bed additive manufacturing processes was established. For instance, the comparison of different methods ofdetermining the relative density of parts showed the advantages and disadvantages of each of the techniques; A study of the SLM machine highlighted the influence of various factors (gas flow, positions of specimens on the constructionplate, or methods of depositing the powder) on the final properties of the produced parts. These elements have an impacton the density of the parts, their surface properties, and their mechanical properties. We found that the positioning of a pieceon the tray is a critical step in the preparation of a build that is not to be neglected; Parametric studies carried out on two types of aluminum alloys—AlSi7Mg0,6 and AM205—have shown that the chemicalcomposition of the aluminum alloy used has a significant influence on the set of operating parameters required tomanufacture an acceptable aluminum alloy part. The energy density, ψ, which is the ratio of the laser power to the productof the lasing speed, the hatching distance, and the layer thickness, is conventionally used for the optimization of the operatingconditions in SLM. Our experimental studies performed at different scales (1D and 3D) have shown the limits of this criterion.The combination of these results with the numerical simulation of the lasing of a single powder bead served as a basis forthe definition of an initial model, the final objective of which will be to optimize the choice of manufacturing parameters
Mezari, Rezak. "Etude du contrôle de procédé de projection laser pour la fabrication additive : Instrumentation, Identification et Commande." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0050/document.
Повний текст джерелаApplications using the direct metal deposition laser process have been expanded rapidly, particularly in aeronautics. However, this promising technology reported some difficult points and faced several problems, mainly the process instability. When these phenomena are not controlled, several defects was obtained (lack of mechanical strength, excessive porosity, poor surface, ... etc.). According to their distribution and size, non-conformity, deteriorate the mechanical characteristics of the parts was recorded and result in a significant cost of post-processing. Therefore, it is important to control the process, to make the process both robust and preserve the structural integrity of the piece. This requires the development of instrumentation through the control process, in order to have a real-time system able to adjust the process parameters to keep a high quality of the manufactured part. In this perspective, the studied thesis developed a technological solution (hardware and algorithms) based on cameras (vision) to monitor key parameters during manufacture. The application of this vision system has been allowed for the implementation of innovative methods by using modern automatic tools to monitor the status of the built part or even correct their defects during the manufacture parts, having a monitoring and process control in real time. Furthermore this vision system performed measurements for the inputs and outputs of the process, matched to a dynamic model that lead to the realization of the process control system
Droulers, Gabriel. "Conception et fabrication d'un automate cellulaire quantique basé sur un procédé de transistors monoélectroniques métalliques damascènes." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8380.
Повний текст джерелаCoutrot, Anne-Lise. "Etude du procédé de fabrication de microbobines par micromoulage pour des applications en IRM et CND." Paris 6, 2003. http://www.theses.fr/2003PA066075.
Повний текст джерелаRitzenthaler, Denis. "Mise au point d'un procédé d'enregistrement original pour la fabrication d'éléments optiques holographiques, utilisables dans l'infrarouge." Mulhouse, 1986. http://www.theses.fr/1986MULH0027.
Повний текст джерелаRichart, Olivier. "Les substituts osseux en hydroxyapatite : Nouveau procédé de fabrication de pièces macroporeuses à gradient de porosité." Valenciennes, 1998. https://ged.uphf.fr/nuxeo/site/esupversions/cf762061-806c-4205-b695-3f16de038391.
Повний текст джерелаDe, Terris Thibaut. "Fabrication additive par fusion laser sélective (SLM) d’un superalliage base nickel : relations procédé – microstructures – propriétés mécaniques." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0061.
Повний текст джерелаThe Selective Laser Melting (SLM) additive manufacturing process is a 3D metal printing process controlled by many parameters related to the machine and to the manufacturing environment. As a result, the quality of the parts (porosity rate, surface roughness) and the productivity depend on the parameters. The work carried out aims to optimize the SLM process in order to be able to produce exchangers for Air Liquide. On the other hand, once the process is optimized, it is necessary to qualify the microstructures induced by the process, and their effects on the mechanical properties. The first part of the study consisted in developing sets of parameters allowing to reduce as much as possible the porosity of the parts, while improving the surface roughness and the productivity. A lot of experimental work has been carried out on the SLM machine of the PIMM laboratory, and a wide exploration of the effects of the first and second order parameters has been done on Inconel 625. The second part of the study consisted of studying the microstructures of parts developed by SLM, from their raw state to their recrystallized state after heat treatment. The relationship between the manufacturing process and the microstructures has been demonstrated, and the mechanical properties of raw and heat-treated parts were then characterized. It appears that the manufacturing parameters will influence the raw microstructural state, on which the mechanical properties depend. Indeed, columnar grains are formed along the building direction. The use of a suitable heat treatment, however, makes it possible to cancel the effect of the process
Puydebois, Simon. "Fragilisation par l'hydrogène en fatigue oligocyclique de l'Inconel 718 issu d’un procédé de fabrication additive (LBM)." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI011.
Повний текст джерелаThis study focuses on the hydrogen embrittlement sensitivity (HE) under cyclic loading of a nickel based alloy, Inconel 718, manufactured by the additive manufacturing process (AM). This material is used in some components of Ariane cryogenic engines that are manufactured by ArianeGroup. Some of these components are solicited under "hydrogen atmosphere", and the risk of embrittlement is a major problem.The metallurgical states of the Inconel 718 AM alloy have been characterized at different structural scales in order to observe a possible impact of the manufacturing process on the microstructure and discuss the possible consequences on the mechanical behaviour of the alloy underhydrogen pressure. Moreover, a forged alloy has also been studied for comparison.To discuss the mechanisms of hydrogen embrittlement in the material, it is first necessary to study the hydrogen behaviour in the material. Electrochemical and gaseous permeation analyses as well as TDS were performed to provide insights into the mechanisms of hydrogen diffusion. Fromthese results, the involvement of grain boundaries in the diffusion mechanisms and the effect of microstructural heterogeneities on the trapping mechanisms in this material have been discussed.On the other hand, the influence of hydrogen on the mechanical behaviour has been investigated under monotonic and cyclic loading in terms of elasto-viscoplastic behaviour, crack initiation process, fatigue crack propagation and toughness. In a first part, the tensile behaviour of the Inconel 718 AMunder hydrogen pressure has been considered. The effects of the loading rate on the mechanisms of embrittlement have been addressed. Moreover, interrupted tensile tests have been carried out to identify the effect of hydrogen on the viscoplastic behaviour and allowing to discuss hydrogen /plasticity interactions.The fatigue behaviour of Inconel 718 AM in the presence of hydrogen gas was investigated by cyclic tests for a 0.1 load ratio (R) under a 300 bar H2 at room temperature. It has been shown that hydrogen leads to a clear decrease of the number of cycles to rupture and to a change in failure mode.The impact of hydrogen has been evaluated on the fatigue crack initiation and propagation stages as well as on the toughness of the material.Finally, all the obtained results allowed a discussion of the hydrogen embrittlement sensitivity of the material, taking into account the hydrogen / plasticity interactions
Singery, Vicky. "C-Ply (Trademark) NCF Carbone extra fin : Etude du procédé de fabrication et optimisation du renfort." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH8973.
Повний текст джерелаAircraft manufacturers are working on the improvement of their engines bymanufacturing fan blades with advanced composite materials to reduce fuel consumption.However, fan blades are made from 3D woven fabrics which often have surface irregularities.It can be minimized by an additional thin layer on the surface : our thesis work is focused onthe development of a new textile structure based on ultra-thin biaxial “Non Crimp Fabric” (NCF)technology. This spread NCF made from intermediate modulus (IM) carbon fibers must belighter than 100 gsm, regular and deformable.During our thesis work, we used Design of Experiments (DOE) methodology to improvethe spreading technology used by Chomarat to make ultra-light NCF materials and meet theestablished requirements. We were able to reach the ultra-thin ply target of less than 50 gsmper ply. After optimizing the spreading process these thin ply tapes are stitched together tocreate NCF. Stability, visual aspect, handling and deformability are dependent on the stitchingsettings (stitching pattern, tension, length, gauge, etc.). Therefore we optimized the stitchingparameters to get the desired properties.After the spreading and stitching process had been optimized, the NCF weremanufactured and tested to validate the desired properties had been achieved. The testingconfirmed that we were able to develop a new carbon fiber NCF that was less than 50 gsm perply, had a coverage rate of higher than 98 % and had good deformability characteristics
Bequet, Stéphane. "Procédé de photogreffage en continu de membranes fibres creuses." Toulouse 3, 2003. http://www.theses.fr/2003TOU30145.
Повний текст джерелаMayer, Philippe. "Contribution à la définition du processus de conception et de réalisation de pièces produitsà hautes caractéristiques spécifiques." Thesis, Paris, ENSAM, 2017. http://www.theses.fr/2017ENAM0003/document.
Повний текст джерелаThe objective of this work is to contribute to the comprehension of a new composite forming process which name is EPITHER. This forming process was created to produce massive composites parts used for structural applications in automotive and aeronautics industries. Two patents have been deposed in 2011 and in 2015/2016.There are three steps in the forming process EPITHER: winding a preform in order to maximize and optimize the anisotropy of the composite considering the mechanical specifications of the final part, forming the preform by a thermoforming step, add morphological properties in a last step.The Phd deals with three major research axis: setting up an experimental study, the comprehension of the consolidation steps and a study of the consolidation parameters
Pereyrol, Frédéric. "Interaction produit-procédé : extension de la modélisation de la commande avec suivi automatique du produit." Montpellier 2, 1993. http://www.theses.fr/1993MON20147.
Повний текст джерелаDaoussi, Rim. "Etude expérimentale et optimisation du procédé de lyophilisation d'un principe actif pharmaceutique en milieu organique." Lyon 1, 2008. http://www.theses.fr/2008LYO10148.
Повний текст джерелаHélion, Florence. "Conditionnement tropicalisé : qualification de matériel et validation d'un procédé d'ensachage." Paris 5, 1992. http://www.theses.fr/1992PA05P227.
Повний текст джерелаDurand, Pierre-Yves. "Modélisations multiphysiques à deux échelles du procédé de fabrication additive par fusion laser de lit de poudre." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4012.
Повний текст джерелаRegardless the industry, additive manufacturing processes for metallic materials have a great industrial potential, especially to product high added value parts. One of the main users of these processes, and more specifically the Selective Laser Melting (SLM), is the tooling industry for plastics processing. It make possible to reduce production costs and manufacturing times while increasing the complexity of manufactured parts. However, in order to improve the quality of the latter and ensure their certifications, a better insight into the related physical phenomena undergone by the material during the process is still needed. In this PhD thesis, the SLM process modeling is multiphysic and concerns two different scales. The first modeling scale uses the Volume Of Fluid method to model the powder bed melting and its ensuing solidification. The numerical powder bed is computed thanks to a specific generator enabling to take account for the experimental granulometry. Once some simplifying assumptions on the physical phenomena stated, the surface tension has been implemented requiring the "heights functions" method use. The second modeling scale corresponds to the building of laser tracks series through the finite element method. The thermomechanical approach uses the element birth method in order to meet as far as possible the experimental conditions. Following its assessment through experiment/simulation face off, model have enable to predict the temperature field and the melted zone width as well as the keyhole formation
Perrot, Christophe. "Optimisation du procédé de fabrication des varistances à base d'oxyde de zinc. Étude du chamottage des oxydes." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1994. http://tel.archives-ouvertes.fr/tel-00843611.
Повний текст джерела