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提出了描述非线性粘弹性材料微损伤演化的两类内变量，一类是描述粘性耗散的内变量，它服从Ｏｎｓａｇｅｒ原理；另一类是描述损伤耗散的内变量，它不服从Ｏｎｓａｇｅｒ原理，而由细观力学的规律确定．并在此基础上构造了一个含两类内变量的自由能密度函数，由此导出了一个新的含损伤演化的非线性粘弹性本构方程
Two kinds of internal variables, which describe the evolution of micro-damage of nonlinear viscoelastic material, are proposed. One is the internal variable describing viscous dissipation, which obeys the Onsager principle and the other is the internal variable that describes damage dissipation. It does not obey the Onsager principle , But by the law of meso-mechanics to determine. Based on this, a free energy density function with two kinds of internal variables is constructed, and a new nonlinear viscoelastic constitutive equation with damage evolution is derived.