Modélisation et étude numérique du plissement des tôles dans les processus d'emboutissage profond

Abstract : The development of wrinkles in sheet metal stamping processes is a defect which becomes more and more frequent, owing to the trend in decreasing sheet thickness, so as to decrease the weight of structures. Te aim of this work is the prediction of wrinkling. The influence of plastic anisotropy on wrinkling behavior is also investigated. Two methods are developed in order to capture the initiation of wrinkling. An analytical study of wrinkling is first developed, which allows us to determine wrinkling limit curves (WLC) for a plate and for a doubly-curved shell. The ability of finite element (FE) simulations to capture the onset of wrinkling is also explored. Finite element simulations of real deep drawing processes are then presented. The finite element results are finally compared with the predictions of the analytical WLC and with the experiments. The influence of normal and planar anisotropy on the WLC is discusses. We obtain a good agreement between analytical predictions and the bifurcation estimated from the FE simulations. Moreover, analytical and numerical predictions are in fair agreement with experiments
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João Pedro de Magalhães Correia. Modélisation et étude numérique du plissement des tôles dans les processus d'emboutissage profond. Autre. Université Paul Verlaine - Metz, 2001. Français. ⟨NNT : 2001METZ025S⟩. ⟨tel-01748963⟩

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