A TRANSFORMATION METHOD FOR IMPLEMENTING CLASSICAL MULTI-YIELD-SURFACE THEORY USING THE HARDENING RULE OF MROZ

A new method for implementing classical multi-yield-surface theory usi ng the kinematic hardening rule of Mroz is proposed, in which a respon se formula describing initial loading is introduced, and further unloa ding and reloading response is then found by applying a transformation to the stress state variables involved in the initial loading formula . The validity of the new formulation is supported by previous experim ental results for biaxial cyclic nonproportional loading. The rules go verning the response behavior under arbitrary loading paths also:serve as a generalization of the Masing model for one-dimensional hysteresi s and they provide instructive insight into material behavior in cycli c plasticity, such as the property of erasure of memory. Copyright (C) 1996 Elsevier Science Ltd.