Scaling of the Strain Hardening Modulus of Glassy Polymers with the Flow Stress

Abstract

In a recent letter, Govaert et al. examined the relationship between strain hardening modulus $G_r$ and flow stress ${\sigma }_{flow}$ for five different glassy polymers. In each case, results for $G_r$ at different strain rates or different temperatures were linearly related to the flow stress. They suggested that this linear relation was inconsistent with simulations. Data from previous publications and new results are presented to show that simulations also yield a linear relation between modulus and flow stress. Possible explanations for the change in the ratio of modulus to flow stress with temperature and strain rate are discussed.

8 pages, 2 figures: clarified arguments on linear proportionality. Accepted for publication in J. Poly. Sci Part B - Polym. Phys

References in corpus (5)

• Equilibration of Long Chain Polymer Melts in Computer Simulations
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• Shear yielding of amorphous glassy solids: Effect of temperature and strain rate
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Cited by in corpus (4)

• Strain hardening in bidisperse polymer glasses: Separating the roles of chain orientation and interchain entanglement
• Viscoplasticity and large-scale chain relaxation in glassy-polymeric strain hardening
• Simultaneous memory effects in the stress and in the dielectric susceptibility of a stretched polymer glass
• Relaxation time of a polymer glass stretched at very large strains