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Conference Computational-Structural-Mechanics-Association Meeting Giens, France, May 25-29, 2009 - Computational Structural Mech Assoc (CSMA)International audienceSimulation of titanium alloys behaviour for cold forming processes of metal sheets. In this paper, the mechanical behaviour of a titanium alloys is modelised for the cold forming processes. The elasto-plastic constitutive law is decomposed in an anisotropic plastic criterion, an isotropic hardening and a kinematic hardening. Non quadratic criteria have been developed by Cazacu et al. (Orthotropic yield criterion for hexagonal closed packed metals, Int. J. Plasticity 22 (2006) 1171-1194), to model the plasticity of hexagonal closed packed materials. The implementation of this model in a finite element software switches between two bases, the equilibrium is calculated in a reference basis and the anisotropy axes define a local basis, updated by the deformation gradient. An identification procedure, based on tensile tests, allows to define all the parameters needed to model the elasto-plastic behaviour. Simulation of cold forming processes (bulging and deep drawing) have been done to validate this model. Numerical results are compared with experimental data, obtained from speckles analysis

Simulation du comportement mécanique des alliages de titane pour les procédés de mise en forme à froid de produits plats