A Macroscopic Yield Function Coupled with Crystal Plasticity Theory for Modeling Forming of AZ31 Magnesium Alloy Sheets

摘要

We present a multi-scale computational tool that uses an anisotropic yield function developed by Cazacu et. al [5] to generate yield surfaces for forming simulations of commercial grade AZ31 magnesium alloy sheets. This macroscopic scale model uses input parameters obtained (a) only from mechanical tests and (b) a combination of mechanical test data and data generated using a microstructure based crystal plasticity model that incorporates slip and twinning mechanisms and the accompanying texture evolution. The crystal plasticity model is calibrated using experimental texture data as well as macroscopic uniaxial tension and compression data. We compare the yield surfaces generated by both sets of data to assess the robustness and sensitivity of the calibration method.