Comportement elastoplastique des aciers lors de Ia mise en forme : theorie micromecanique, simulations numeriques et resultats experimentaux.
Keywords:
plasticity, polycrystal, steel, texture, anisotropy, micromechanics, simulation, forming, residual stresses, slip, dislocations, grainsAbstract
Recent developments concerning the modelisation of the elastoplastic behaviour of steel sheets using micromechanical models are presented. For the polycrystalline grains, the connection of moving dislocations and the global slip rate a well as the hardening matrix describing the slip systems interaction are introduced in order to describe the behaviour of the single crystals. The field equations for heterogeneous elastoplastic metals are transformed into an integral equation which is approximate by the self consistent assumption. New results concerning hardening, plastic anisotropy, crystallographic texture evolution are compared to experimental measurements.
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