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

Abstract : 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. Two yield criteria have been implemented, the classical Hill 1948 criterion and a non quadratic criterion, which have been developed by Cazacu and her team, to model the plasticity of hexagonal closed packed materials. The implementation of this model in a finite element software switch between two bases, the equilibrium is calculated in a reference basis and the anisotropy axes define a local basis, updated by the deformation gradient. In this local basis, the stress increment is compute with a return mapping algorithm. Several identification procedures, based on different experimental values chosen among tension, compression or shear tests, allow defining all the parameters needed to model the elasto-plastic behaviour. Simulations of cold forming processes (bulging and deep drawing) have been done to validate this model and discuss about the best identification procedure. Numerical results are compared with experimental data, obtained from speckles analysis for bulging tests. Strain localisation and earing of deep-drawn cups are correctly predicted using a Cazacu yield criterion to model the plastic behaviour of a-titanium alloys.
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Submitted on : Wednesday, October 13, 2010 - 2:46:57 PM
Last modification on : Wednesday, October 14, 2020 - 4:02:44 AM
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  • HAL Id : pastel-00526029, version 1

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Benoît Revil-Baudard. Simulation du comportement mécanique des alliages de titane pour les procédés de mise en forme à froid. Matériaux. École Nationale Supérieure des Mines de Paris, 2010. Français. ⟨NNT : 2010ENMP0017⟩. ⟨pastel-00526029⟩

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