Strain rate and temperature dependent constitutive equations are proposed for polymer materials based on existing isotropic formulations of viscoplasticity. The proposed formulations are capable of simulating some of the important features of deformation behavior of amorphous and semicrystalline polymers. The material model is based on the assumption that the evolution of flow stress is dependent on the rate of deformation, temperature, and a n appropriate set of internal variables. The proposed theory is cap…
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