Développement de méthodologies dédiées à l’analyse robuste de la tenue de structures composites sous chargements complexes tridimensionnels.

Abstract : Composite materials, particularly unidirectional laminates, are increasingly used for the design of airplane structures because of their interesting mass/rigidity/strength ratio. Their use is now extended to the design of primaries structures (in metallic so far) for the future range of aircrafts. In those primaries structures, lots of composite components are subjected to complex out-of-plane loadings such as L-angle structures. The main failure mechanism encountered is delamination in the radius mainly due to the applied out-of-plane loadings. Nevertheless, the main weakness of the unidirectional laminates is their out-of-plane mechanical properties and the prediction of this failure mode in laminated structures (subjected to 3D loadings) remains a scientific challenge. It is thus necessary to propose an innovative 3D failure approach, physically based, and the associated identification procedure for the out-of-plane strengths. The aim of this Phd-thesis is thus to propose a 3D strength analysis method dedicated to 3D loadings and matching the requirements of a design office (low time of computation and easy to identify and to carry out). A 3D progressive failure approach which permits to predict damages and failure modes encountered in laminated structures has been proposed. The out-of-plane strengths (tensile and shears) are identified through the analysis of tests performed on L-angle structures, representative of the final aeronautical components. Finally, some unfolding/folding tests on L-angle specimens have been performed in order to validate the proposed 3D failure approach.
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Jean-Sebastien Charrier. Développement de méthodologies dédiées à l’analyse robuste de la tenue de structures composites sous chargements complexes tridimensionnels.. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0004⟩. ⟨pastel-00966987⟩

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