Pages 345-346
In order to evaluate slip behavior inside a crystalline material, a stress calculation by finite element method (FEM) and a high cycle fatigue test in a multicrystalline copper specimen were carried out. 17PSBs are observed near grain boundaries on the surfaces and the FEM result shows that the PSBs are generated where maximum resolved shear stress, τ_<mrss> is high. It suggests slip behavior inside materials is depicted with distribution of τ_<mrss>. The region of τ_<mrss> concentration is within 50μm from the surface and the maximum magnitude of τ_<mrss> on the surfaces is larger than that inside the specimen. This implies initial slips occur at surface near grain boundaries.
