Analyse structurelle des composites tissés prenant en compte le procédé de mise en forme

Abstract : During the forming process, the woven fabric/prepreg can undergo large fiber rotations due to plane shear deformation. These rotations are mostly important in zones with complexe gometries such as double curvature. Therefore, the fiber reorientations in the new sheared fabric affects significantly the strength and performance of final product. The aim of this thesis work is to develop a constitutive model that taking into account the angle's between the weft and warp yarns. An hypoelastic model has been developed in order to simulate the forming of dry fabric. The forming simulation allows to determine the final reorientations between yarns through the shear angles. The later are transferred into an orthotropic elastic model, developed to perform a structural analysis of a cured composite after its forming. The orthotropic model has been validated by a tensile test on cured specimens after a bias extension test. Finally, to demonstrate the performance of this orthotropic model (taking into account the reorientation of yarns), FE analysis on cured hemisphere and double dome have been performed. The results obtained by the orthotropic model have been compared with those obtained from a model without taking into account the reorientation of yarns.
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Abderrahmen Aridhi. Analyse structurelle des composites tissés prenant en compte le procédé de mise en forme. Matériaux. Université de Lyon; École nationale d'ingénieurs de Tunis (Tunisie), 2019. Français. ⟨NNT : 2019LYSEI012⟩. ⟨tel-02187368⟩

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