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Дисертації з теми "Caoutchouc – Contraintes (mécanique) – Déformations (mécanique)"
Carcan, Alain. "Modélisation des grandes déformations axisymétriques de membranes minces hyperélastiques incompressibles." Compiègne, 1985. http://www.theses.fr/1985COMPS134.
Повний текст джерелаWarneboldt, Iona. "Multiaxial fatigue design of elastomeric parts using Equivalent Fatigue Loads." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0002.
Повний текст джерелаThis thesis introduces an Equivalent Fatigue Load (EFL) approach for the multiaxial fatigue design of elastomeric parts. As direct Finite Element Analysis (FEA) calculations of automotive in-service loads (Road Load Data (RLD)) are too expensive, the objective is to derive simplified load blocks as a realistic input for numerical damage calculations. Three streps are applied for this method: the localization method, the material damage function and the EFL determination process. Various fatigue tests have been conducted (415 samples) to study the fatigue behavior of this complex type of relaxing and non-relaxing multiaxial loading on natural rubber specimens. Lifetime and crack features are analyzed to eventually introduce an appropriate critical planebased fatigue measure and to establish a novel mean strain effect model. This criterion is generalized throughout an original critical plane search method. To estimate the local mechanical response (localization method), this thesis identifies an axes-coupling method that is fitted for the nonlinear nature of elastomeric structures. It is based on the multiplicative decomposition of the deformation gradient tensors. These two steps are then implemented in the framework of the EFLdetermination process. For this, a global optimization method is added to determine the simplified load blocks, causing locally the same fatigue behavior in the given structure. The computational costs of this optimization are reduced by only considering a subset of the most damaged material points for EFLdetermination. Finally, the method has been challenged on a specimen to outline its capabilities and to validate the approach
Courtois, Philippe. "Application des éléments cinématiques au calcul du forgeage de pièces en déformations planes ou axisymétriques." Lille 1, 1986. http://www.theses.fr/1986LIL10025.
Повний текст джерелаBuy, François. "Étude expérimentale et modélisation du comportement plastique du tantale : prise en compte de la vitesse de déformation et de l'histoire du chargement." Metz, 1996. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1996/Buy.Francois.SMZ9632.pdf.
Повний текст джерелаThe growing interest numerical results showing the response of structures to dynamic loading conditions implies the development of very sophisticated constitutive models. These models must take two points into account: transcribe a bunch of experimental facts and predict the behaviour of the material under specific loading conditions. Through the mechanical behaviour of tantalum, we tried to understand and describe the phenomena occuring in b. C. C. Metals. Plastic strain cannot be considered as a parameter describing the physical state of the material. Klepaczko's model based on the evolution of a single state parameter (the total dislocations density) fitted already fairly well with the experimental results for f. C. C. Metals. We performed quasistatic and dynamic torsion tests on high-purity polycrystalline tantalum at room temperature. Moreover, on the same type of samples, we performed jump tests in strain rate with Split Hopkinson Torsion Bars. Although Klepaczko's model can correctly fit our experimental results, the introduction of a second state parameter (the mobile dislocations density) seems necessary for a better understanding and restituion of the phenomena occuring during plastic flow. We present a proceeding to determine analytically the contributions to the flow stress of the microstructure and of the loading conditions (temperature and strain rate). Finally, we compare the results in compression and torsion. It appears that the kind of solicitation has a major role on the mechanical behaviour of tantalum which limits at present the proposed model
Estivalèzes, Erik. "Étude et développement d'un élément de poutre composite pour un revêtement déséquilibré." Toulouse, INSA, 1995. http://www.theses.fr/1995ISAT0002.
Повний текст джерелаLegrand, Laurène. "Etude linéaire et non linéaire de la déformation de fronts de fissures planes au cours de leur propagation et notamment de leur coalescence." Paris 6, 2011. http://www.theses.fr/2011PA066662.
Повний текст джерелаDursapt, Michel. "Contribution expérimentale de la métrologie des états de surface à l'étude du comportement des surfaces rugueuses soumises à l'action de contraintes mécaniques." Ecully, Ecole centrale de Lyon, 1999. http://www.theses.fr/1999ECDL0014.
Повний текст джерелаSaad, Patricia. "Modélisation et identification du comportement non linéaire des cales en caoutchouc." Ecully, Ecole centrale de Lyon, 2003. http://bibli.ec-lyon.fr/exl-doc/psaad.pdf.
Повний текст джерелаWe develop a numerical model to compute non linear rubber bush response. The objective is to take into account elasticity, damping, and non linear properties in a simple model dedicated to full vehicle modelling simulation. It is therefore important that the constitutive model a accurately capture theses aspects of the mechanical behaviour. To take into account these properties, Finite Element Codes use several complex constitutive laws. All these constituve equations can be integrated in finite element models and many algorithms are developed for this purpose. The main drawback of this procedure is its complexity. The number of dof is too high to be integrated in a vehicle study. Our work aims at giving a simplified approximation of the force as a function of the displacement and its derivatives, starting from a microscopic constitutive equation. Starting from a finite element model and a constutive law, we want to generate an equivalent rheological model, with a few dof. This model aims at predicting the frequency response of the bush, function of its geometry, of the load, of the parameters of the constitutive law. To do so, we approximate the displacement as a linear combination of admissible kinematic displacement fields, according to the Rayleigh-Ritz approximation. Hyperelastic models are used to fit on linear quasi static force deflection curves. Viscoelastic constitutive laws are also developped. In order to predict amplitude dependency observed when we measure steady state harmonic response, we use a Volterra development of the stress strain constitutive equation. To take into account preload effects, we linearize a viscohyperelastic model. The predictions of these models are compared to experimental data
Perrin, Henri-François. "Étude des déformations de pièces composites induites par le procédé d'infusion de résine." Paris, ENSAM, 2011. http://www.theses.fr/2011ENAM0041.
Повний текст джерелаThe dimensional instability of the composite parts limits the large diffusion of composites materials. It has to effect a shape complexity limitation and the increasing of the joined part number. This works is focused on the deformation induced by liquid resin infusion process. The main purpose is the characterization of the link between the product-processresources interactions and the final part shape. Experimental analyze on flat composite part has underlined a specific deformation mechanism, responsible of a majority of the transferred stress. The influence of industrialization parameters has been experimentally highlighted. Based on this experimental data, a prediction model has been established and his robustness has been evaluated. Than, the role of theses interactions in case of angled part has been investigated. Their contribution on the spring-in angle is minor compare to the intrinsic contribution such as the thermal and cure shrinkage anisotropies. Liquid resin infusion process can induce significant stress transfer into the part. This work represents a tool that enable a prediction of the deformation amplitude as function of number of industrialization parameters
Detraux, Jean-Michel. "Formulations et applications en grandes déformations des solides." Compiègne, 1985. http://www.theses.fr/1985COMPI199.
Повний текст джерелаКниги з теми "Caoutchouc – Contraintes (mécanique) – Déformations (mécanique)"
Mechanics of materials: An introduction to the mechanics of elastic and plastic deformation of solids and structural materials. 3rd ed. Oxford: Butterworth-Heinemann, 1997.
Знайти повний текст джерелаMechanics of materials: An introduction to the mechanics of elastic and plastic deformation of solids and structural components. 2nd ed. Oxford: Butterworth-Heinemann, 1995.
Знайти повний текст джерелаHearn, E. J. Mechanics of materials: An introduction to the mechanics of elastic and plastic deformation of solids and structural components. 3rd ed. Boston: Butterworth-Heinemann, 1997.
Знайти повний текст джерелаHearn, E. J. Mechanics of materials: An introduction to the mechanics of elastic and plastic deformation of solids and structural components. 2nd ed. Oxford, OX, England: Pergamon Press, 1985.
Знайти повний текст джерелаRésistance des matériaux. Ecole Polytecnique de, 2003.
Знайти повний текст джерелаBazergui. Résistance des matériaux. Ecole Polytechnique Montreal, 1993.
Знайти повний текст джерелаReference Stress Methods: Analysing Safety and Design. Wiley, 2003.
Знайти повний текст джерелаHearn, E. J. Mechanics of Materials: An Introduction to the Mechanics of Elastic and Plastic Deformation of Solids and Structural Components. Elsevier Science & Technology Books, 2013.
Знайти повний текст джерела