Abstract
AbstractExperiments were performed to determine the effects of strain rate, temperature, and pressure on the flow stress of polyethylene and Lexan polycarbonate deformed in shear. The results were analyzed to determine the activation enthalpy and the shear and dilatation activation volumes of the rate‐limiting mechanism of the deformation process. Results show that the activation event involves a volume containing several monomer units and that this volume must dilate by as much as 7% during the activation event. The activation enthalpy was approximately 2.5 × 10−12 erg for polyethylene and 1.1 × 10−12 erg for polycarbonate. The rate‐limiting mechanism for polyethylene seemed to be unchanged by plastic strains of up to 250%.
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