Crystal Plasticity Based Numerical Modelling of Large Strain Deformation inHexagonal Closed Packed Metals

In this chapter the finite strain plastic deformation of hexagonal closed packed polycrystals have been simulated using crystal plasticity theories. The simulations have been carried out using a rate-dependent elastic-viscoplastic crystal plasticity constitutive models. Two models are considered in the analyses; a model based on the classical Taylor assumptions and a model based on crystal plasticity finite element method. The plastic deformation mechanisms accounted for in the models are the slip systems in the matrix (parent grain), extension twinning systems, and the slip systems inside the extension twinned regions. The parameters of the constitutive model have been calibrated using the experimental data. The calibrated model has then been used to predict the deformation of AM30 magnesium alloy in uniaxial tension and compression as well as in bending. For the bending strain path, the effects of texture on the strain accommodated by the deformation mechanisms and bending moment have been investigated.