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Дисертації з теми "Caoutchouc – Endommagement, Mécanique de l' (milieux continus) – Modèles mathématiques"
Glanowski, Thomas. "Compréhension et modélisation des mécanismes élémentaires d’endommagement en fatigue d’élastomères renforcés au noir de carbone." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0009.
Повний текст джерелаThe fatigue properties of carbon black filled elastomers are strongly related to the inclusions’ population, induced by complex recipes and the successive stages of the manufacturing process (mixing, injection and curing). The improvement of these properties involves at first an ability to describe the statistical features of these inclusions’ population in terms of nature, size, geometry, orientation and spatial distribution. Then, a detailed understanding of the damage mechanisms is required in order to define the mechanical criticality of inclusions according to their characteristics under cyclic loading. This study presents at first the tools developed, based on a detailed analysis of X-ray micro-tomography data. The obtained results on the inclusion’s populations and the damage induced allow highlighting the potential of these tools and their current limits for the studied materials. Atypical inclusions, unknown in the litterature, has been discovered. The cavitation mechanism appears to be the most critical regarding fatigue because it leads to micro-cracks that propagate in the matrix. A comparison of the criticality of the inclusions’ parameters regarding a cavitation criterion is carried out with a parametric study using finite elements simulations. Finally, thermographic measurements at the inclusions’s scale show the additional investiguations needed for a better understanding of the damage mechanisms at this scale
Warneboldt, 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
Touchard, Fabienne. "Spécificités du comportement mécanique de composites stratifiés à fibres longues et à matrice thermoplastique." Poitiers, 1994. http://www.theses.fr/1994POIT2338.
Повний текст джерелаMartin, Boris. "Formulation intégrale de l'approche DNRL et réflexions sur l'endommagement." Vandoeuvre-les-Nancy, INPL, 2003. http://www.theses.fr/2003INPL054N.
Повний текст джерелаWelemane, Hélène. "Une modélisation des matériaux microfissurés - Application aux roches et aux bétons." Phd thesis, Lille 1, 2002. http://oatao.univ-toulouse.fr/6638/1/Welemane_6638.pdf.
Повний текст джерелаHelfer, Thomas. "Etude de l'impact de la fissuration des combustibles nucléaires oxyde sur le comportement normal et incidentel des crayons combustible." Ecully, Ecole centrale de Lyon, 2006. http://bibli.ec-lyon.fr/exl-doc/thelfer.pdf.
Повний текст джерелаThis thesis aims to model the cracking of pressurised water reactor fuel pellets and its consequences on the mechanical behaviour of the fuel rod. Fuel cracking has two main consequences. It relieves the stress in the pellet, upon which the majority of the mechanical and physico-chemical phenomena are dependent. It also leads to pellet fragmentation. Taking fuel cracking into account is therefore necessary to adequately predict the mechanical loading of the cladding during the course of an irradiation. The local approach to fracture was chosen to describe fuel pellet cracking. Practical considerations brought us to favour a quasi-static description of fuel cracking by means of a local damage models. These models describe the appearance of cracks by a local loss of rigidity of the material. Such a description leads to numerical difficulties, such as mesh dependency of the results and abrupt changes in the equilibrium state of the mechanical structure during unstable crack propagations. A particular attention was paid to these difficulties because they condition the use of such models in engineering studies. This work was performed within the framework of the ALCYONE fuel performance package developed at CEA/DEC/SESC which relies on the PLEIADES software platform. ALCYONE provides users with various approaches for modelling nuclear fuel behaviour, which differ in terms ofthe type geometry considered for the fuel rod. A specific model was developed and implemented to describe fuel cracking for each of these approaches. The 2D axi-symmetric fuel rod model is the most innovative and was particularly studied. We show that it is able to assess, thanks to an appropriate description of fuel cracking, the main geometrical changes of the fuel rod occurring under normal and off-normal operating conditions
Guillemer-Neel, Clervie. "Comportement mécanique et endommagement de la fonte à graphite sphéroïdal." Compiègne, 1999. http://www.theses.fr/1999COMP1184.
Повний текст джерелаSupartono, Franciscus Xaverius. "Contribution à la modélisation de l'endommagement anisotrope du béton : Texte imprimé." Ecully, Ecole centrale de Lyon, 1985. http://www.theses.fr/1985ECDL0015.
Повний текст джерелаAndo, Kohei. "Modélisation théorique de l'endommagement des matériaux composites et application de l'effet de l'endommagement à la rupture et à l'optimisation." Compiègne, 1987. http://www.theses.fr/1987COMPD072.
Повний текст джерелаBatisse, Rémi. "Contribution à la modélisation de la rupture ductile des aciers : étude quantitative de l'état inclusionnaire d'un acier ferritique faiblement allié au Mn-Ni-Mo et de son influence sur l'amorçage et la propagation de la déchirure ductile." Compiègne, 1988. http://www.theses.fr/1988COMPI279.
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