Quantitative relation between the relaxation time and the strain rate for polymeric solids under quasi‐static conditions

摘要: Relaxation time is an essential physical quantity reflecting the hysteresis of microstructure materials. To associate relaxation with strain rate, stress–strain curves six types polymers at low rate were normalized, and a nondimensional generalized Maxwell model incorporating strain-rate-dependent times was obtained by internal variable theory irreversible thermodynamics. The results indicate that constitutive equation may capture well normalized behaviors are not related to rate. ratio initial modulus secant maximum stress also found rely on anymore. Furthermore, strain-rate independence occurred only when proportional interval for from zero stress. varied in power law explicit relation helpful providing concise promising solution predicting quasi-static mechanical response viscoelastic solids. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44110.