LPSO型マグネシウム合金におけるキンク形態が巨視的材料挙動に及ぼす影響

抄録

Magnesium alloys with the long period stacking order (LPSO) structure show the superior strength and are expected as the next generation structural material. In the mechanical behavior of LPSO-structured magnesium, the kink band in the LPSO phase may play an important role. In this study, to evaluate the deformation around kink band, a higher-order gradient crystal plasticity model is adopted. The reproducing kernel particle method (RKPM), which is a kind of meshfree method, is introduced to solve the higher-order crystal plasticity. The numerical integration scheme is essential in a meshfree analysis, and the stabilized conforming nodal integration (SCNI) is utilized. A numerical analysis of a specimen with kind band is demonstrated using the present method, and it is shown that kind band increases the macroscopic flow stress of material. Also, the effect of kink band shape on strengthening of flow stress is discussed.