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Contribution à la simulation de l'emboutissage de préformes textiles pour applications composites.

Abstract : In this work, a discrete approach for the simulation of the preforming of dry woven reinforcementis proposed. A “unit cell” is built using elastic isotropic shells and axial connectors instead of bars and beams used in previous studies. Shell elements are used to take into account the in-plane shear stiffness and to manage contact phenomenon with the punch and die. Connectors reinforce thestructure in the yarn directions and naturally capture the specific behavior of the fabric. To identify the material parameters, uniaxial tensile tests and bias tests have been employed. A numerical algorithm,coupling Matlab and Abaqus/Explicit, is used to determine the shear parameters by an Inverse method. The model has been implemented in Abaqus to simulate hemispherical stamping.Experimental results are compared to numerical simulations, good agreement between both resultsis shown for the case of single layer forming.This model has been then used to simulate a multilayer performing and a numerical study of the effect of fiction coefficient has been performedFinally a tool which interfaces a CAD Software to the Abaqus/code has been developed.
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  • HAL Id : pastel-00841194, version 1

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Walid Najjar. Contribution à la simulation de l'emboutissage de préformes textiles pour applications composites.. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2012. Français. ⟨NNT : 2012ENAM0036⟩. ⟨pastel-00841194⟩

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