Abstract
It is proposed the expression of a newly extended plastic constitutive model to initial anisotropy materials. Proposed flow rule permits a plastic strain rate tensor to follow up a certain extent a stress rate tensor which rotates instantly from the direction of current stress tensor as is the case of plastic instability phenomenon. It has quite same structure of the non-associated normality model in which the plastic potential function is defined independently from yield function. It is also suggested the expression of the equivalent plastic strain iate which is conjugated with the equivalent stress corresponding to the proposed yield function in plastic work rate. This is important to express generalized work-hardening rule for materials which have plastic flow stress anisotropy. The proposed theory may overcome the serious problems in the associated plastic flow theory.
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