微視組織中の界面とすべり面の相互の空間配置に関する情報を取り入れた新しい臨界分解せん断応力の検討

抄録

A new model of critical resolved shear stress with the effect of geometrical relationship between slip plane and microstructure interface, was investigated using a crystal plasticity analysis with Cu polycrystals. The extended expression of the Bailey-Hirsch type model was used for the critical resolved shear stress. The effect of geometrical relationship between slip plane and microstructure interface was incorporated into the values for microstructural size parameter that express size effects in the extended expression of the Bailey-Hirsch type model l. The distribution of equivalent plastic strain and plastic shear strain on slip systems were investigated. At a nominal strain of 0.03, almost the same distributions of equivalent plastic strain were obtained with the simple grain size model and the new model where the effect of geometrical relationship between slip plane and microstructure interface were taken into account. On the other hand, the distributions of plastic shear strain on slip systems were different in the two models.