Abstract
A formability assessment using the crystal plasticity model is conducted to investigate the effect of deformation twinning on the formability of polycrystalline magnesium sheet. For presenting the polycrystalline behaviors of magnesium, the homogenization-based finite element method is introduced, and the Marciniak-Kuczyńsk type sheet necking analysis is demonstrated. Two kinds of deformation twinning model, i.e., the asymmetric slip type and van Houtte’s models are adopted, and the effect of those models on the forming limit analysis is numerically discussed. It is revealed that the lattice reorientation due to deformation twinning plays an important role in plastic flow localization of magnesium, while shear deformation caused by deformation twinning has an insignificant effect.
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