A constitutive equation for small strain viscoelastic response is considered in which stress relaxation occurs faster as strain increases. The constitutive equation is of single integral type and has a psuedo-or material time function which is calculated from a strain dependent shift function. First, it is shown that such a consti tutive equation can account for yield as observed in polymers for a number of different stress and strain histories. Next, the constitutive equation is used in the analysis of the p…
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