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Modélisation de l'anisotropie plastique et application à la mise en forme des tôles métalliques

Abstract : This research work, realized in two laboratories (LPMM of ENSAM of Metz and LPMTM of Paris 13 university) proposed to study the plastic anisotropy of sheet metals during forming operations. The applications in mind concern the prediction, through the forming process numerical simulation, of the initial plastic anisotropy and its influence on the global behaviour of the sheet. An anisotropy that manifest, during forming operation, by the apparition of undulations on the sheet edge. To do this, a class of strain rate potential has been introduced. Potential written in the frame of so called dual approach (less commonly used), where the introduce variable is the plastic strain rate, contrary to the classical approach (commonly used), where the criterion is defined with stress tensor. In addition, the material work-hardening has been considered by introducing internal variables. A large study has been devoted to the identification of the different criteria introduced, basing on the experimental data, as well as those of material texture measure. The materials under study are some steel grades and aluminium alloys. Different identification strategies have been investigated, in order to insure of the good determination of the behaviour model parameters. To allow the exploitation of the different criteria in the frame of the forming process simulation, a robust and efficient computer implementation has been performed in a finite element code. A solver routine following implicit time integration scheme has been developed in order to obtain a good accuracy. The modelling has been applied to the prediction of anisotropic coefficient. This study highlighted the capability of each criterion to reproduce the strong plastic anisotropies. Then, the application of this modelling to the study of deep drawing corns has been realized and allowed to show the effects of the criterion on the number of the formed corns as well as there pronunciation degree. A correlation between the Lankford coefficient and the deep drawing corns has been established
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Meziane Rabahallah. Modélisation de l'anisotropie plastique et application à la mise en forme des tôles métalliques. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ044S⟩. ⟨tel-01749000⟩



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