THE CREEP CONSTITUTIVE LAW UNDER NONCONSTANT TEMPERATURE STATES
Zhang Yitong(Dept.of Mechanics,Tianjin University, Tianjin,300072)
This Paper presents the concept of creep curves under nonconstant temperature states,the method of determining creep curve under nonconstant temperature along a temperature history from a group of creep curves under constant temperature stain, the concept of equivalent creep curve on the terminal temperature and, finaly, the general creep constitutive equations of viscoelastic materials under nonconstant temperature states. It is proved that the theory on thermorheological simple material is a spotal case of this theory. This Paper reveals the physical meaning of the mathematical methods in theory on thermorheological simple material.