抄録
The Natural Strain is obtained by integrating an infinitesimal strain increment on identical line element. Hence, this theory has merits that can remove the rigid body rotation from the rotating angle of a line element and it can satisfy the addition rule of strain on an identical line element. In our previous report, using the Natural Strain theory, the configuration of the yield surface has been examined by performing the proportional loading tests for tension and torsion after giving the pre-deformation of uni-axial tension to the test pieces. In this paper, the configuration of the yield surface, which is obtained after giving the pre-deformation of large simple shear, is estimated by investigating the modulus of strain hardening h for various directions in the stress space.
