A Yield surface and flow rule for orientationally hardening polymers subjected to arbitrary deformations

摘要

The phenomenological anisotropic flow rule and yield surface introduced previously were shown to reproduce fairly well the orientational hardening behavior of the glassy polymer polycarbonate. Rigid- plastic, rate independent behavior was assumed, and attention was restricted to loading histories in which the principal axes of stress and strain remained fixed. Here, this previous work is extended to the case of arbitrary, albeit still rate independent, elastic-plastic finite deformations.