Strain Hardening in Polymer Glasses: Limitations of Network Models

Details Strain Hardening in Polymer Glasses: Limitations of Network Models Strain Hardening in Polymer Glasses: Limitations of Network Models

2007-05-29

arxiv.org/abs/0705.4301v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.117801

Simulations are used to examine the microscopic origins of strain hardening in polymer glasses. While traditional entropic network models can be fit to the total stress, their underlying assumptions are inconsistent with simulation results. There is a substantial energetic contribution to the stress that rises rapidly as segments between entanglements are pulled taut. The thermal component of stress is less sensitive to entanglements, mostly irreversible, and directly related to the rate of local plastic arrangements. Entangled and unentangled chains show the same strain hardening when plotted against the microscopic chain orientation rather than the macroscopic strain.

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