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

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

2009-02-27

arxiv.org/abs/0903.0023v2

Physics

Condensed Matter

Soft Condensed Matter

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

Scientific paper

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.

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