[SY-F1] Nonlocal multiscale modeling of deformation behavior of polycrystalline copper by second-order homogenization method
The macroscopic mechanical property of metal materials relates to the microscopic polycrystalline structure. In the present study, micro- to macroscopic nonuniform deformation of the polycrystalline pure copper is evaluated by experimental and numerical studies. The uniaxial tension of the specimen having curved gage section was performed. The effects of the curvature and the grain size on the deformation localization in the specimen were experimentally evaluated by digital image correlation method. The strain localization around the curvature is modulated for the specimen with larger crystal grain. The computational simulations of the tensile tests were then performed using the second-order homogenization method. A series of the numerical simulation clarified the size-depended strain localization in the macroscopic scale.