Large Strain Constitutive Modeling of Poly(ethylene terephthalate)and Poly(ethylene terephthalate)-Glycol

摘要

Poly(ethylene terephthalate)is a widely used polymer for consumer products such as carbonated beverage containers,drawn fibers and stretched films.Much of its commercial success lies in the fact that it crystallizes at large strains.The stress-strain behavior of PET is strongly dependent on time,temperature,and state of deformation and these dependencies are particularly complex above the glass transition temperature.A robust constitutive model to accurately account for its stress-strain behavior is therefore highly desirable in order to simulate and predict its behavior during processing.