Добірка наукової літератури з теми "Composites à fibres – Endommagement, Mécanique de l' (milieux continus) – Modèles mathématiques"
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Дисертації з теми "Composites à fibres – Endommagement, Mécanique de l' (milieux continus) – Modèles mathématiques"
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 джерелаZitoune, Redouane. "Analyse des conditions d'usinage lors du perçage de structures composites fibres longues en carbone-époxy." Toulouse 3, 2004. http://www.theses.fr/2004TOU30182.
Повний текст джерелаThe drilling of composite structures long fibres in carbon/epoxy is accompanied by damages which are indexed according to their place of appearance. We distinguish three zones: at the entry of the hole - which corresponds to the separation of the top ply of the laminate, at the wall of the hole - with wrenching of fibres and the resin degradation, and at the exit of the hole - with the separation of the last ply. The zones of the wall and hole exit are the place of the major defects which harm the lifetime of bolted or riveted assemblies. Within the framework of this work we are interested in the analysis of the wall and exit hole defects. To analysis the wall defect, a simplified study is proposed. It consists in a numerical and experimental study of the orthogonal cutting of unidirectional laminates. The angle (q) between the fibres and the cutting speed direction (Vc) is respectively 0ʿ, +45ʿ, 90ʿ and -45ʿ. For the analysis of the defect at the hole exit, an experimental and numerical study on two types of materials in carbon/epoxy long fibres is carried out
Meraghni, Fodil. "Identification expérimentale des mécanismes d'endommagement contribuant à la modélisation micromécanique du comportement élastique-endommageable des composites à fibres discontinues orientées aléatoirement (C. F. D. O. A)." Compiègne, 1994. http://www.theses.fr/1994COMPD697.
Повний текст джерелаLai, Dawei. "Contribution à la modélisation de la rupture des plaques stratifiées entaillées sous un chargement monotone ou cyclique comprenant une sollicitation de compression." Compiègne, 1988. http://www.theses.fr/1988COMPD150.
Повний текст джерелаEste, Alexia. "Modélisation de l’endommagement d’un composite 3D carbone/carbone : comportement à température ambiante." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0006/document.
Повний текст джерела3D C/C composites are commonly employed in aerospace industry due to their outstandingmechanical properties at high temperatures. In order to ensure the integrity of structures,knowledge of the composite mechanical behaviour and fracture mechanisms is crucial.For this purpose, damage modeling of a 3D C/C composite, at room temperature, isproposed in which a meso-scale approach is considered. At this description scale, 3D C/Ccomposites are made of two materials : carbon fibers yarns and carbon matrix. Each materialbehavior is modeled by an elastic damage law (isotropic for matrix, orthotropic for yarns)with a limited number of parameters.The parameters identification process is based on experimentaldata obtained from previous work and from an experimental campaign carried outthrough this thesis work. This campaign aimed to a greater understanding of the materialmechanical behavior at mesoscopic scale. Furthermore, experimental tests were carried outto validate the composite modeling. It is shown that experimental reponses obtained fromfour-point and three-point bending tests are particularly well described from the proposedmesoscopic model
Vasiukov, Dmytro. "Damage modeling of fibre reinforced polymer composite materials under cyclic loadings by a simplified approach." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10043.
Повний текст джерелаA numerical framework for the modeling of the damage in fibre reinforced polymer composite materials has been developped. The objectives were to provide efficient numerical tools to predict the damage under static and cyclic loading. Two different models were proposed, one based on a fully computational multi-scale homogenization technique and a second one under the hypothesis of the meso-mechanics associated with a coupled damage-plastic constitutive model. The latter has been used in a new approach developped to predict the life of composite structures. As a first approach, a multi-scale application has been developed to better understand the influence of the damages occuring at lower scales on the macroscopic response. The macroscopic is defined by homogenization of a unit cell. The scheme is used to analyze the effect of the matrix damage on the material response in the case of unidirectional composites. To overcome the difficulties of the multi-scale approach, a meso-scale phenomenological model based on the coupled plasticity with continuous damage mechanics is proposed. All comparisons of the simulation with experiments and other models have shown good agreements. The third contribution is the development of a new approach to predict the life of composite materials based on the assumption that the material reaches a damage stabilized state during his life. This assumption makes it possible to use the simplified analysis. The life of the material is considered depending on the level of the thermodynamical forces associated with damage at the stabilized state by the use of a power law. Good agreements are obtained with experimental results
Maziz, Ammar. "Analyse des endommagements dans les pipes en matériaux composites." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0019.
Повний текст джерелаDamage modelling of hybrid composite materials has played an important role in the design of composite structures. Although numerical models for the progressive damage of filament wound hybrid composite pipes such, matrix cracking, delamination, and fiber failure have been developed in the literature; there is still a need for improvement. This thesis aims to develop damage models suitable for predicting dynamic behaviour and intra-laminar and inter-laminar damage in hybrid composite tubes under internal pressure subjected to dynamic loading such as the impact of an external object. Fracture mechanics and continuum damage mechanics approaches were adopted to build the damage model. A detailed analysis was performed to have an overview of all the damage mechanisms until the final failure. Cohesive elements were inserted into the two-dimensional and three-dimensional models to simulate the initiation and propagation of matrix cracking and delamination in cross-layered laminates. The damage model was implemented in the FE code (Abaqus/Explicit) by a user-defined material subroutine (VUMAT). Subsequently, validations based on test/calculation correlations on real subsystems and/or parts were performed. Damage initiation was predicted based on the stress-strain failure criteria, while the damage evolution law was based on the dissipation of failure energy. The nonlinear behavior of the material in shear was also taken into account and validated against experimental/numerical results. The predictions show excellent agreement with the experimental observations
Lévêque, David. "Analyse de la tenue au délaminage des composites stratifiés : identification d'un modèle d'interface interlaminaire." Cachan, École normale supérieure, 1998. http://www.theses.fr/1998DENS0002.
Повний текст джерелаPatamaprohm, Baramee. "Conception et durabilité de réservoirs en composites destinés au stockage de l’hydrogène." Thesis, Paris, ENMP, 2014. http://www.theses.fr/2014ENMP0021/document.
Повний текст джерелаPresently, the compressed hydrogen storage under high pressure appears to be the most sophisticated solution regarding to a compromise of mass, service pressure and also volume of pressure vessels. However, the challenges of pressure vessels nowadays are their performance improvement as well as their cost reduction. In this context, we studied the type IV hydrogen storage pressure vessel in carbon fibre/epoxy composites. This work aims to obtain a reliable pressure vessel design. Firstly, an experimental study of associated materials and pressure vessel characterisation has been carried out. Then, we proposed a probabilistic model for a composite which is dedicated in particular to fibre breakage using multi-scale simulations in accordance with its mechanical and physical properties. Once this model joined with damage criteria dedicated separately to the others damage mechanisms are integrated into the pressure vessel simulations. Finally, recommendations on composite pressure vessels have been proposed in order to improve their performances and to decrease the mass of composite directly corresponding to the reduction of composite pressure vessels cost
Gillard, Adrien. "Caractérisation et modélisation du comportement thermomécanique d'un composite 3D carbone/carbone : étude du comportement aux interfaces à haute température." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0021/document.
Повний текст джерелаC/C composites are used as shield for aerospace applications since they display beneficial thermo-mechanical properties at high temperature, as well as high resistance to ablation. Though the macro-scale behavior was thoroughly studied in the past, no model can efficiently tie the properties of the constituents at the meso-scale to the effective macroscopic behavior. In addition, the phenomenological models proposed so far cannot predict a change in the composition. Besides, the interfaces influence on the out-of-axis mechanical behavior of the composite is yet to be evaluated. Thus, the goal of this work is to build a multi-scale model for the thermo-mechanical behavior of a 3D C/C, with a particular focus on the interfacial properties and its evolution with temperature. This study is based on the morphological and thermo-mechanical characterization of the material and its constituents. An original push-out test device has been developed to conduct high-temperature interfacial characterization at two scales (yarn/yarn and fiber/matrix interfaces). Collected experimental data were used for modeling purposes at the meso-scale. A cohesive zone model has been developed to take into account the specific behavior of the interfaces. Finite element simulations were successfully performed to reproduce the non-linear behavior of the material including the effective properties evolution with temperature. This model allowed to effectively link the damage mechanisms observed atthe lower scale to the 3D C/C macro-scale behavior