2018 年 3 巻 p. 135-140
The estimation of the slip deformation under the multiaxial stress state in the polycrystalline structure, which is caused by highly anisotropic deformation in microscopic scale of material, can provide an important information to understand the deformation mechanisms of crystalline material. In the present study, an evaluation method of slip deformation in the microscopic local region is proposed by coupling the Digital Image Correlation (DIC) Method and the crystalline plasticity theory. Microscopic strain field and slip deformation of the polycrystalline pure copper under uniaxial tension were evaluated using the proposed method. The nonuniform deformation in the crystal grain was firstly evaluated by DIC. Then, the slip deformation for all grains and all slip systems were estimated using the proposed method. Although the initial crystalline orientations were similar for different grains, the active slip systems for the grains did not coincide due to the interaction with surrounding grains. The multiple slip deformation occurred for almost crystal grain regardless of the degree of the total slip in the FCC metal.
