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Modélisation et simulation des splits dans les structures composites stratifiées

Abstract : Structural aerospace parts design in composite material requires a large number of tests and simulations at different scales. In this industrial context, constitutive laws are more and more important.The idea of this thesis is to improve the description of transverse cracking in the composite mesomodel, introduced in the LMT during the 80's. The objective is to be able to predict accurately the failure of a laminated composite structure, at cheap computational cost, in order to replace some of expensive mechanical tests.We propose a new version of our model which combine, isolated transverse cracks description such as splits, and an homogenized representation to model important transverse cracks density. To reconcile these two approcahes an ad hoc criterion is introduced, if necessary macrocracks are set in the model by using cohesive elements. A significant proportion of this works is to design and elaborate methods and computation strategy, in order to transfer from academic world to industry. To maintain computer code, and be able to compute industrial mechanical problems (large number of DOF, complex geometry) only commercial softwares must be used. For this purpose, the whole code is implemented in a non intrusive way on SAMCEF software. Finally, to challenge the new strategy, a campaign of validation, with our industrial partner AIRBUS GROUP INNOVATION was carried about structures in laminated composite material, with complex stackings with stress concentrations. Constitutive laws with softening triggers off mesh dependance issues, then the question of localization is discussed from a practical angle.
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https://tel.archives-ouvertes.fr/tel-02092438
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  • HAL Id : tel-02092438, version 1

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Hadrien Bainier. Modélisation et simulation des splits dans les structures composites stratifiées. Génie mécanique [physics.class-ph]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLN052⟩. ⟨tel-02092438⟩

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