Original paper(Vol.48 No.1 pp.44)

Local Stress-Strain Behavior of Polycrystalline Materials

Sakamoto Masao; Nihei Masatoshi

Abstract:The relationship between the local deformation within a grain and macroscopic deformation of material was investigated by FEM simulation and tensile tests. Tensile tests for investigating the local deformation within a grain were carried out using on the thin copper specimens in a SEM chamber. From these tests, it was found that the local stress strain behavior within a grain depends on the orientation of grains and the strain shows distribution within a grain.
It was also found that the value of local strain depends mainly on the gauge length used for the calculations of strain. A FEM simulation showed a good agreement with tensile test results by considering the crystallographic orientation of each grain and that of the constraint from circumferential grains.

Key Words:stress-strain curve, deformation, local strain, FEM simulation