Numerical Modelling of Large Strain Deformation in Magnesium

In this paper, a new constitutive framework based on a rate-dependent crystal plasticity theory is presented to simulate large strain deformation phenomena in HCP metals such as magnesium. In this new model the principal deformation mechanisms considered are crystallographic slip and deformation twinning. The new framework is incorporated into in-house finite element (FE) codes. Simulations of uniaxial tension and compression for the magnesium alloy AM30 are performed and the results are compared with experimental observations of the specimens deformed at 200°C. Limitations of the current modelling approaches are also discussed.