53 巻 (1987) 485 号 p. 139-147
The present paper proposes a new law of anisotropic hardening of plasticity, using an internal time concept developed by the endochronic theory. This report describes a fundamental aspect of the present law as well as comparison with the previous experiments under tension-torsion conditions. The present law can accurately predict shape change of yield surface with only two parameters of deformations, and also express vertex effects of yield surface as a special case of the present theory.