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The stress relaxation models (1) describe a nonlinear (strain\u2010dependent) behavior that becomes linear at very low strains, (2) quantify the effect of temperature, (3) may quantify the effects of changes in free volume, and (4) ensure very fast computations of the materials\u2019 response irrespective of the experimental time scale. The models are sensitive to the influence of different initial states of the material, as may result from varying degrees of molecular orientation and aging levels, and are able to predict from experimental stress relaxation moduli (for a poly (methylmethacrylate)\u2014PMMA and a bis\u2010phenol\u2010A polycarbonate\u2014PC) the values of the crossover frequency, \u03bd<jats:sub><jats:italic>c<\/jats:italic><\/jats:sub>, crossover temperature, <jats:italic>T<jats:sub>c<\/jats:sub><\/jats:italic>, and the minimum activation energy, in addition to the initial and long\u2010time plateau moduli, in agreement with independently measured values.  POLYM. ENG. 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