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Effet de la porosité dans les réservoirs composites à parois épaisses : Observations expérimentales et modélisation numérique

Abstract : The topic of this thesis is the influence of voids on the mechanical properties of carbon fibre reinforced polymers used in high performance applications, such as pressure vessels for hydrogen storage. Manufactured through filament winding, these thick-walled structures can show a significant void content. The effect of these voids on the strength of pressure vessels and, more in general, on the strength of composite structures subjected to multiaxial loads, is not thoroughly understood. The work presented in this thesis is carried out in the context of an existing model of tensile failure of unidirectional composites developed at MINES ParisTech. The objective of the work presented here is to take into account additional factors, such as void content. X-ray tomography and optical microscopy observations are carried out to characterize voids in a carbon-epoxy pressure vessel. In another experimental study, mechanical tests are performed on carbon-epoxy specimens with different levels of void content. The influence of a biaxial load (longitudinal tension and through-thickness compression) is evaluated using a custom-designed experimental setup.At the microscopic scale, tests on notched epoxy specimens are carried out to investigate microscopic void growth and the mechanical behaviour of the resin under a multiaxial stress state. Finally, a numerical approach to modelling failure of a thick-walled cylinder is proposed in the framework of the multiscale fibre break model, taking into account the experimental observations.
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Submitted on : Tuesday, November 3, 2020 - 1:10:10 PM
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  • HAL Id : tel-02986921, version 1

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Jan Rojek. Effet de la porosité dans les réservoirs composites à parois épaisses : Observations expérimentales et modélisation numérique. Mechanics of materials [physics.class-ph]. Université Paris sciences et lettres, 2020. English. ⟨NNT : 2020UPSLM015⟩. ⟨tel-02986921⟩

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