A nonlinear creep experiment under combined stresses and time-varying temperature is reported. By using the constitutive equations for combined stressing at various temperatures and a time-temperature superposition principle, the creep of polyurethane under constant combined tension and torsion and varying temperature was computed. Results were best described by assuming no temperature-history dependence on increasing temperature and temperature-history dependence on decreasing temperature.
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Mark et al. (1975) studied this question.
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