巨視ひずみ勾配を受ける多結晶純銅の力学的応答に及ぼす試験片寸法の影響の実験的評価

抄録

To clarify the effect of specimen size on the nonuniform deformation of polycrystalline copper, the tensile test of specimens having curved gage section with various sizes was performed. The digital image correlation method was used to evaluate the distribution of nonuniform strain on the specimen surface during the tensile deformation. A series of the experiment indicate clarified that the size effect on the mechanical property of polycrystalline copper. For large specimens, a symmetric strain distribution was observed in the center of the specimens. On the other hand, because the crystal grains are relatively large when the size of the specimen is small, the deformation is likely to be influenced by factors in the microscopic region due to the crystal orientation.