Prévision des dommages d'impact basse vitesse et basse énergie dans les composites à matrice organique stratifiés

Abstract : In order to improve the understanding and the quantification of the impact damage formation and of their consequences on the composite structure behavior, numerical simulation seems to be a necessary complement to experiments. This thesis aims at designing an impact model suited for a dynamic implicit finite element numerical simulation, able to predict the induced damages.The first step of the work consisted in building an impact model using the ply behavior law “Onera Progressive Failure Model” (OPFM) and the bilinear cohesive law defined by Alfano and Crisfield, then in evaluating the impact response and the predicted damage sensitivity to the different parameters of the behavior laws. Impact and indentation tests on carbon/epoxy laminate plates have then been performed, analyzed and compared with the numerical results, in order to evaluate the impact performance of OPFM and its limits.This work points out three key results. First, the use of cohesive zone models seems necessary to predict the typical load drop. Secondly, the out-of-plane constraints, especially the shearing, must be taken into account to correctly predict impact damages. Finally, even if the OPFM model is able to qualitatively predict impact damages, the lack of softening or viscoplasticity seems to limit their quantitative prediction.
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Emilie Trousset. Prévision des dommages d'impact basse vitesse et basse énergie dans les composites à matrice organique stratifiés. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0008⟩. ⟨pastel-00942339⟩

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