ON DILATATIONAL PLASTIC CONSTITUTIVE EQUATION OF DUCTILE MATERIALS AND PLASTIC LOADING PATHS AT BIFURCATION

摘要

The dilatational plastic constitutive equation presented in this paper is proved to be in aform of generality. Based on this equation, the constitutive behaviour of materials at themoment of bifurcation is demonstrated to follow a loading path with the response as "soft"as possible.