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Дисертації з теми "Mousses de polyuréthanes – Propriétés mécaniques – Modèles mathématiques"
Le, Bail Jean-Baptiste. "Modélisation du comportement mécanique sous chargement d’une butée d’amortisseur en mousse de polyuréthane : vers une démarche de dimensionnement en fatigue." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0003.
Повний текст джерелаPolyurethane foam jounce bumpers are widely used in the automotive industry. Their main function is to absorb vertical shocks to the wheels and contribute to the integrity of the vehicle suspension. The mechanical response of this type of parts implies to take into account different mechanisms, from the buckling of the walls of the part to the self-contact through the geometrical non-linearities. The current characterization of these polyurethane foam jounce bumpers in fatigue is currently limited to the customer’s specifications and to the tests predefined by him. The objective of this thesis is to carry out a complete experimental characterization of the mechanical behavior in order to identify an Hyperfoam type behavior law. This characterization is also based on imaging techniques, SEM and tomographic, in order to characterize the link between the microstructure and the mechanical behavior of the jounce bumper. This study should allow to define a global approach for the fatigue design of polyurethane foam jounce bumper
Mamoud, Fady. "Modélisation de l'élasticité et du fluage des empilements gravitaires de sphères creuses métalliques brasées." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0056.
Повний текст джерелаThis thesis was about studying a cellular material intended to combine mechanical and acoustical properties in order to be used to reduce aircraft engines noise. The study focused on elasticity and creep of cellular materials based on gravity-driven packings of brazed metallic hollow spheres. The approach was, at first, to numerically generate and characterize experimental-like gravity-driven packings. Then, in order to enable us to simulate the mechanical behaviour of these materials, a simplified calculation model based on shell finite elements has been set-up. This model allowed us to numerically characterize the elastic properties of this kind of but could not be used to simulate the creep behaviour of the packings. We thus studied the creep behaviour of some model structures to assess the difference between these materials and metal foams behaviour. This study has shown that, unlike foams, hollow spheres based materials almost never display a steady creep state
Bénito, Sylvain. "Modélisation et simulation du comportement mécanique des milieux plastiques mous : mousses liquides, émulsions." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13858/document.
Повний текст джерелаAbstract
Jadawi, Akram. "Expanded bio-thermoplastic foam obtained from starch : thermo-physical and mechanical characterizations." Rouen, 2014. http://www.theses.fr/2014ROUES019.
Повний текст джерелаDabo, Mouhamadou. "Analyse du comportement mécanique des mousses polymères : apport de la tomographie X et de la simulation numérique." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE041/document.
Повний текст джерелаPolymer foams materials combine mechanical, thermal, chemical and optical interesting properties going with light weighting structures problems. However, to diversify their applications and make them even more efficient in health field, transportation or building, a fine study of the relationships between manufacturing processes to generated microstructures and resulting properties must be conducted. These mechanical properties are highly depending on the properties of material with which foams are made but also on the morphology of their microstructures (orientation, distribution and pore size, wall thickness). Thus it is crucial to quantify and measure these parameters to strive for a detailed understanding of the mechanical properties and define models capable of linking global behavior of cellular materials to bulk materials and microstructures. Working closely with research and development division of INTEREP, European leader in waterproof cellular rubber, an experimental characterization of the mechanical behavior of polymer foams of different natures and different topologies has been performed first. Then geometrical modeling was developed from micro structural observations of real foams in x-ray micro-tomography and from virtually generated microstructures through a physical description of polymer foams manufacturing process. Finally finite element simulation in 2D and 3D of these microstructures were coupled with the experimental characterization of bulk material allowing thus to reproduce and finely study deformation mechanisms experimentally observed on polymer foams and refine empirical behavior laws by taking into account additional characteristic parameter of cells statistical distribution in space like their location and their size distribution and shape
Jmal, Hamdi. "Identification du comportement quasi-statique et dynamique de la mousse de polyuérathane au travers de modèles de mémoire." Phd thesis, Université de Haute Alsace - Mulhouse, 2012. http://tel.archives-ouvertes.fr/tel-01017088.
Повний текст джерелаLei, Lei. "Étude des matériaux poreux thermo compressés pour la modélisation des écrans acoustiques automobiles." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2428/document.
Повний текст джерелаThis work was carried out in the framework of the project EcOBEx, whose main objective was to reduce the passby noise by mean of acoustic shields in the engine compartment of the vehicle. The acoustic shields are manufactured by thermocompression of uniform porous materials. The material’s properties and thickness evolve according to the degree of compression experienced by the material. The objective of this work is to propose some laws to predict the evolution of the materials properties from their initial non compressed values and the compression rate. Firstly, we focus on the parameters of the Johnson-Champoux-Allard-Lafarge (JCAL) equivalent fluid model : porosity, air-flow resistivity, tortuosity, viscous characteristic lengths, thermal characteristic length, static thermal permeability. Some analytical expressions are proposed to predict the variation of these parameters as a function of compression. They are derived from a physical model of cylindrical fibres where the fibre orientation variations induced by the thermocompression can be taken into account. The results are in good agreement with the measurements made two types of materials (open cell foam and fibrous). A generalized empirical model is finally proposed for the air-flow resistivity.In a second part, we focus on the elastic parameters, which are necessary to take into account the vibration of the skeleton. The quasi-static experimental method is first applied to study the evolution of the Young’s modulus along the compression rate for fibrous and open cell foams. A power law is then proposed to predict these variations. Finally, an inverse method for estimating the elastic properties of an orthotropic poro-elastic material from a vibratory measurement of a thermocompressed three layer sandwich structure is proposed. This method allows us to characterize the elastic properties of a porous material in a situation close to its actual application