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Simulation of titanium alloys behaviour for cold forming processes of metal sheets

Abstract : Simulation 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.
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Submitted on : Monday, March 7, 2011 - 11:28:03 AM
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Benoît Revil-Baudard, Elisabeth Massoni. Simulation of titanium alloys behaviour for cold forming processes of metal sheets. Mechanics & Industry, EDP Sciences, 2010, 11 (3-4), pp.Pages 265-270. ⟨10.1051/meca/2010029⟩. ⟨hal-00574128⟩

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