AN ENDOCHRONIC THEORY ACCOUNTING FOR DEFORMATION-INDUCED ANISOTROPY OF METALS UNDER BIAXIAL LOAD

Using the experimental results of yield surfaces obtained by Wu and Ye h [1991] (Int, J. Plasticity, 7, 803) for 304 stainless steel, this wo rk provides a verification of the endochronic theory of plasticity acc ounting for deformation induced anisotropy. The experiments were perfo rmed under proportional loading conditions. The main difference betwee n this paper and other papers that attempt to describe the distortion of a yield surface is that, in addition to distortion, motion of yield surface (kinematic hardening) has also been addressed by this paper. The result has shown that the theory predicts the experimental data wi th substantial accuracy. However, since in this theory the plastic str ain increment, although normal to the initial yield surface, is in the radial direction emanating from the center of the subsequent yield su rface, validity of the present model must be further studied for the c ase involving nonproportional loading conditions. Copyright (C) 1996 E lsevier Science Ltd