Strain hardening in polymer glasses: Limitations of network models

被引:122
作者
Hoy, Robert S. [1 ]
Robbins, Mark O. [1 ]
机构
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.99.117801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 rearrangements. 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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页数:4
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