Modélisation de la plasticité orthotrope en contraintes planes : application à la détermination des limites de formage des tôles

Abstract : The prediction of strain distributions and forming limits in sheet-metal forming process requires the use of accurate constitutive relations of the plastic behaviour in numerical computations codes. The aim of this work is to propose a modelling of plastic yielding that apllies to orthotropic materials under plane stress conditions. This modelling is based on a planar coordinate representation of the yield surface in principal stress-space, with account of the orientation of principal stress axes with respect to principal directions of orthotropy. In comparison with classical plastic yield criteria, the modelling allows us to obtain improved agreement with experimental yield surfaces or with results from homogenisation computations. It also allows an improved description of the variation of the uniaxial yield stress as a function of the angle between tensile axis and rolling direction. The yield criterion has been implemented in calculations of the forming limits of sheets with transversely-isotropic behaviour, in the stretching range. The results show that realistic improvements concerning the shape of the yield surface lead to a better prediction of the forming limits
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Rabih Makkouk. Modélisation de la plasticité orthotrope en contraintes planes : application à la détermination des limites de formage des tôles. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ053S⟩. ⟨tel-01776807⟩

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