NUMERICAL MODELLING OF LARGE STRAIN DEFORMATION IN MAGNESIUM ALLOY AM30

摘要

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. The new framework is incorporated into in-house codes. The simulations are performed using a crystal plasticity model in which crystallographic slip and deformation twinning are the principal deformation mechanisms. Simulations of various stress states (uniaxial tension, uniaxial compression and the ring hoop tension test) for the magnesium alloy AM30 are performed and the results are compared with experimental observations of specimens deformed at 200°C.