A crystal plasticity modeling for plane strain deformation of pure magnesium

Abstract eng:
A rate-dependent elastic-viscoplastic constitutive model is proposed to simulate the plane strain deformation of pure magnesium crystal. The basal, prismatic and pyramidal slip systems in the parent grain, compressive twinning (CT) and tensile twinning (TT) are incorporated in the model. The constitutive descriptions of CT and TT are distinguished to better characterize their effects on the overall hardening of magnesium single crystals. The plane strain numerical schemes of seven different orientations for loading and fixed boundary are considered and their various mechanisms and characteristics of plastic deformation are discussed. These computational predictions are carefully compared with their corresponding macroscopic experimental observations and other numerical results. These results prove that it is necessary to distinguish different twinning systems and their associated hardening laws for the plastic deformation of magnesium and its alloy.

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