Literatura académica sobre el tema "Optimisation multi-Matériaux"
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Tesis sobre el tema "Optimisation multi-Matériaux":
Montoya, Maxime. "Optimisation du perçage de multi-matériaux CFRP/Titane et/ou Aluminium". Thesis, Paris, ENSAM, 2013. http://www.theses.fr/2013ENAM0019/document.
The proposed research topic is a preliminary study to minimize costs of drilling operation in multi-materials stacks as CFRP/Al and CFRP/Ti. In order to minimize these costs, it is initially necessary to understand the cutting tools wear mechanisms and the phenomenon leading to the non-conformity of the drilled hole. In this way, drilling tests were carried out. The instrumentation of this tests allow to access to the cutting forces and to the temperature achieved during the cutting process.In association, analyses devices were used to monitored the holes quality. The cutting tools wear mechanisms were observed through scanning electron microscope. The access of the cutting edge profile, by the measures achieved on a numerical microscope, allows quantifying the tool wear.The temperature fields near the tool/chip interface influence significantly the tool life. They are difficult to reach by experimentation, but can be obtained using numerical simulation of the workpiece thermal solicitations. The model developed allow, by inverse method, to reach the hole wall temperature using the temperature reach at 4mm of it. The temperature field was obtained and the tendencies observed experimentally were confirmed by this model
Azina, Clio. "Optimisation de multi-matériaux à base de diamant pour la gestion thermique". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0767/document.
Today, the microelectronics industry uses higher functioning frequencies in commercialized components. These frequencies result in higher functioning temperatures and, therefore, limit a component’s integrity and lifetime. Until now, heat-sink materials were composed of metals which exhibit high thermal conductivities (TC). However, these metals often induce large coefficient of thermal expansion (CTE) mismatches between the heat sink and the nonmetallic components of the device. Such differences in CTEs cause thermomechanical stresses at the interfaces and result in component failure after several on/off cycles.To overcome this issue, we suggest replacing the metallic heat sink materials with a heat-spreader (diamond film) deposited on metal matrix composites (MMCs), specifically, carbon-reinforced copper matrices (Cu/C) which exhibit optimized thermomechanical properties. However, proper transfer of properties in MMCs is often compromised by the absence of effective interfaces, especially in nonreactive systems such as Cu/C. Therefore, the creation of a chemical bond is ever more relevant. The goal of this research was to combine the exceptional properties of diamond by means of a thin film and the adaptive thermomechanical properties of MMCs. Carbon-reinforced copper matrix composites were synthesized using an innovative solid-liquid coexistent phase process to achieve designed composition gradients and optimized matrix/reinforcement interface properties. In addition, the lack of chemical affinitybetween Cu and C results in poor thermal efficiency of the composites. Therefore, alloying elements were inserted into the material to form carbide interphases at the Cu/C interface. Their addition enabled the composite’s integrity to be optimized in order to obtain thermally efficient assemblies. The diamond, in the form of a thin layer, was obtained by laser-assisted chemical vapor deposition. This process allowed action on the film’s phase purity and adhesion to the substrate material. Of particular importance was the influence of the interfaces on thermal properties both within the composite material (matrix-reinforcement interface) and within the diamond film-MMC assembly. This work was carried out within the framework of a Franco-American agreement between the Institute of Condensed Matter Chemistry of the University of Bordeaux in France and the Department of Electrical Engineering at the University of Nebraska-Lincoln, in the United States. Funding, in France, was provided by the Direction Générale de l’Armement (DGA), and by the American equivalent in the United States
Jallageas, Jérémy. "Optimisation du perçage de multi-matériaux sur unité de perçage automatique (UPA)". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00982328.
Djourachkovitch, Tristan. "Conception de matériaux micro-architecturés innovants : Application à l'optimisation topologique multi-échelle". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI086.
The design on innovative micro-architectured materials is a key issue of modern material science. One can find many examples of this kind of materials such as composites materials, foams, and even micro-architectured materials (materials which come along with some periodicity properties at the small scale). A common criterion for these materials is their ratio between weight and stiffness. Topology optimization is well suited for the design of this kind of material since the criterion that is subject to improvement is directly integrated in the formulation of the minimization problem. In this context, we propose some methods for the design of micro-architectured materials using topology optimization and for several criteria. We afterwards illustrate the benefits of these materials thought multi-scale simulations based on the theory of the first gradient and the scale separability assumption in the homogenization framework.A coupled macro/micro optimization method is presented for the concurrent optimization of the these two interdependent scales. The development of a numerical demonstrator has allowed to illustrated those various methods and to test several optimization criteria, mechanical models etcetera. In order to reduce the computational costs that might become exorbitant especially for multi-scale problems since the number of design variables increases significantly, a database approach is proposed. A broad range of micro-architectured materials is stored (and enhanced) for several criteria (weight, stiffness, original behaviour). This database is then consulted throughout the coupled optimization
Rey, Pierre-André. "Caractérisation et optimisation du perçage orbital du Ti6Al4V et d'empilages CFRP/Ti6Al4V". Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30113/document.
The study presented in this thesis deals with the orbital drilling of Ti6Al4V titanium alloy and CFRP carbon fiber composite. This case study is taken from an industrial problem, from the Airbus company wishing to incorporate parts CFRP to reduce its mass. But the combination of these two materials with antagonistic properties poses many problems for drilling. This is why new alternatives to conventional drilling have been sought. Among these alternatives, orbital drilling with micro-lubrication showed interesting prospects. That is why it was chosen in this industrial application. But this process is still relatively unexplored and there is little feedback and many developments to achieve. Orbital drilling process is very different from the conventional axial bore. The bore is machined with a smaller diameter tool than the hole, which describes a helical path in the material. All work presented focus on the characterization for the optimization of the orbital drilling process. To achieve this, several aspects were discussed. First, a geometric modeling and kinematics of operation has been developed. The inclusion of the exact geometry of the tool and cutting conditions helped to define the geometry of the chip at every moment. This knowledge is important for understanding the achieved material removal mechanism, it allows to estimate the loading of the tool and the conditions in which machining is performed. From this first geometric modeling, modeling of cutting forces was established. For this, a model of mechanistic type of effort was used. Its application was adapted to orbital drilling in order to best represent the operation. The thus modeled efforts were compared to those observed experimentally in order to validate the proposed model. This allowed to consider the use of this model for a better understanding of this material removal process. The influence of model inputs, namely the cutting conditions and tool geometry was studied. Another contribution of this work is the characterization of the orbital drilling of CFRP stacks / Ti6Al4V. Indeed, many tests were developed to characterize the orbital drilling process. Experimental procedures have therefore been put in place. First of all, the instrumented test means had to be characterized so that it better corresponds to the means used by the manufacturer and above all it allows to carry out reliable and repeatable testing. The experimental design implemented subsequently helped to define the influence of cutting parameters on the efforts and realized diameters. In this phase of characterization, the bore in errors have also been studied. Thus, the trends have been observed. The results obtained in this work in the meeting helped to consider the process optimization of routes, through the control of advances, the drilling strategy, but also the geometry of the tool. Tracks have been proposed and are subject to further study. modeling implementation and the identification of phenomena occurring during the operation have also laid the foundation for process monitoring. This can be considered passively, to monitor the smooth running of the operation, but also actively to act in real time to the control of the process, based on identified phenomena, to ensure the desired quality
Sofi, Khadija. "Optimisation du générateur d'impulsions magnétiques et adaptation énergétique des machines pour les besoins d'assemblage innovants multi-matériaux". Electronic Thesis or Diss., Amiens, 2021. https://theses.hal.science/tel-03856084.
Magnetic pulse generators are being used more and more in multi-material forming and welding applications and produce a precise forming of metal parts. This PhD. thesis aims to calculate, using analytical methods, the magnetic field, the magnetic pressure, and the Lorentz force generated during electromagnetic forming of a metal tube. First, we propose to analyze the generator operation using a massive coil in interaction with a magnetic field shaper. Then, we develop the 3D models of these components using FEM and BEM methods in order to determine the evolution of the current and the temperature distributions. In this research work, we experimentally study the impact of the field shaper on the current pulse and then using a thermal camera we measure the temperature distribution in the massive coil. Afterwards, we calculate analytically the distribution of the magnetic field created around the coil based on the mutual inductance of two circular and coaxial coils. Finally, we develop an analytical and numerical study of a tube crimping by magnetic pulses. The used analytical method is based on the calculation of the self-inductance and the mutual inductance of the coil and the tube in 3D order to determine the Lorentz force and the magnetic pressure applied on the tube
Faure, Alexis. "Optimisation de forme de matériaux et structures architecturés par la méthode des lignes de niveaux avec prise en compte des interfaces graduées". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI047/document.
Shape optimization methods are promising methods and are gradually becoming industrialized. They provide the ability to automatically design structures with optimal behavior. They are outstanding tools for exploration and design of new materials.We use these methods to generate architectured multi-phased materials with prescribed thermoelastic properties. We first propose several solutions and we classify them by the mechanisms they rely on in order to control the effective properties. We also propose to evaluate the influence of an interface with a gradient of properties on the obtained architectures.Eventually we focus on the plausible manufacturing solution to produce our architectured materials. In this context, additive manufacturing methods (often considered as the support of an incoming industrial revolution) is our main option. We introduce several strategies to circumvent some limitations and side effects of these manufacturing methods during optimization process. We particularly focus on Fiber Deposition Molding, which induce an important mechanical anisotropy in processed parts. Then we consider the problem of overhangings features in design and propose a way to handle them prior to additive manufacturing using a mechanical criteria.Finally we take into account geometrical non linearities in optimization process. We highlight the pros and cons of this new modeling by presenting several applications of non linear actuators design
Alby, Delhia. "Matériaux innovants pour la rétention sélective de césium et de strontium à partir de solutions aqueuses multi-composants : synthèse, optimisation et évaluation des performances". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT168.
This work focuses on the synthesis and characterization of new nanostructured materials that can be potentially proposed as alternatives in the field of nuclear decontamination. The first part is devoted to the state of the art on the use of inorganic materials for decontamination purposes, with the emphasis placed on their sorption capacity and selectivity. The layer materials are considered as offering potential for such applications. In consequence, the main efforts in this work have been focused on manganate and vanadate nanostructures.Solvothermal synthesis of these materials was developed on the basis of micro-wave oven procedures to control the materials structuring, thus leading to vanadate nanotubes and manganate nanoflowers. The optimization of vanadates was carried out by taking into account the effect of various factors (e.g., duration of maturation and heating stages, nature and mass of the template) on both the structural and textural properties of the resulting substrates. It was demonstrated that the scrolling of the layers was strongly influenced by the amount of amine and its chemical structure. Indeed, only the amine templates possessing long chains allowed homogeneous nanotubes to be achieved. More information about the structuring process was inferred when coupling experimental and simulation approaches.The sorption performance of the resulting solid materials in terms of sorption capacity and selectivity was assessed in model and simulated systems obtained by using either ultrapure or river water with an adequate composition as solvent to prepare aqueous solutions of strontium or/and cesium. The results of sorption experiments clearly indicated strong selectivity of the vanadate structures toward Cs+ and that of the manganate ones toward Sr2+, even under conditions of competition among various ionic species.Direct calorimetry measurements of heat effects accompanying sorption were correlated with the results of molecular simulation studies to shed more light on the origin of the improved sorption selectivity
Da, Daicong. "Topological optimization of complex heterogeneous materials". Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1102/document.
Mechanical and physical properties of complex heterogeneous materials are determined on one hand by the composition of their constituents, but can on the other hand be drastically modified by their microstructural geometrical shape. Topology optimization aims at defining the optimal structural or material geometry with regards to specific objectives under mechanical constraints like equilibrium and boundary conditions. Recently, the development of 3D printing techniques and other additive manufacturing processes have made possible to manufacture directly the designed materials from a numerical file, opening routes for totally new designs. The main objectives of this thesis are to develop modeling and numerical tools to design new materials using topology optimization. More specifically, the following aspects are investigated. First, topology optimization in mono-scale structures is developed. We primarily present a new evolutionary topology optimization method for design of continuum structures with smoothed boundary representation and high robustness. In addition, we propose two topology optimization frameworks in design of material microstructures for extreme effective elastic modulus or negative Poisson's ratio. Next, multiscale topology optimization of heterogeneous materials is investigated. We firstly present a concurrent topological design framework of 2D and 3D macroscopic structures and the underlying three or more phases material microstructures. Then, multiscale topology optimization procedures are conducted not only for heterogeneous materials but also for mesoscopic structures in the context of non-separated scales. A filter-based nonlocal homogenization framework is adopted to take into account strain gradient. Finally, we investigate the use of topology optimization in the context of fracture resistance of heterogeneous structures and materials. We propose a first attempt for the extension of the phase field method to viscoelastic materials. In addition, Phase field methods for fracture able to take into account initiation, propagation and interactions of complex both matrix and interfacial micro cracks networks are adopted to optimally design the microstructures to improve the fracture resistance
Glé, Philippe. "Acoustique des Matériaux du Bâtiment à base de Fibres et Particules Végétales - Outils de Caractérisation, Modélisation et Optimisation". Phd thesis, INSA de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00923665.