Estimation of dynamic thermo viscoelastic moduli of short fiber-reinforced polymers based on a micromechanical model considering interphases/interfaces conditions

A novel three-dimensional micromechanical model describing frequency- and temperature-dependent viscoelastic behavior of short fiber-reinforced polymers (SFRPs) with graded interphase and slightly weakened interfaces are established. Elastic-viscoelastic correspondence approach, time-temperature superposition principle and Rao and Dai's (Compos. Struct. 2017; 168: 440) modification on the calculation of interface damage tensors are applied for dynamic thermo viscoelasticity prediction of the composite with the consideration of interphase/interface conditions. Certain parameters like filler content, interphase property, the aspect ratio of inclusions, frequency, and temperature were thoroughly analyzed to see their effect on the dynamic behavior of unidirectional SFRPs. Some valuable conclusions are made, which constitutes a valuable contribution to the theoretical prediction of SFRPs' mechanical properties.