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Title: Thermal effects in dislocation theory. II. Shear banding

Abstract

The thermodynamic dislocation theory presented in previous papers is used in this paper to describe shear-banding instabilities. Central ingredients of the theory are a thermodynamically defined effective configurational temperature and a formula for the plastic strain rate determined by thermally activated depinning of entangled dislocations. This plastic strain rate is extremely sensitive to variations of the stress and the ordinary temperature. As a result of this sensitivity, the system undergoes rapid shear banding instabilities when ordinary thermal relaxation is slow. Finally, it also undergoes rapid changes from elastic to plastic behaviors at yielding transitions.

Authors:
 [1]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Physics
Publication Date:
Research Org.:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1352805
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 95; Journal Issue: 1; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Langer, J. S. Thermal effects in dislocation theory. II. Shear banding. United States: N. p., 2017. Web. doi:10.1103/PhysRevE.95.013004.
Langer, J. S. Thermal effects in dislocation theory. II. Shear banding. United States. doi:10.1103/PhysRevE.95.013004.
Langer, J. S. Wed . "Thermal effects in dislocation theory. II. Shear banding". United States. doi:10.1103/PhysRevE.95.013004.
@article{osti_1352805,
title = {Thermal effects in dislocation theory. II. Shear banding},
author = {Langer, J. S.},
abstractNote = {The thermodynamic dislocation theory presented in previous papers is used in this paper to describe shear-banding instabilities. Central ingredients of the theory are a thermodynamically defined effective configurational temperature and a formula for the plastic strain rate determined by thermally activated depinning of entangled dislocations. This plastic strain rate is extremely sensitive to variations of the stress and the ordinary temperature. As a result of this sensitivity, the system undergoes rapid shear banding instabilities when ordinary thermal relaxation is slow. Finally, it also undergoes rapid changes from elastic to plastic behaviors at yielding transitions.},
doi = {10.1103/PhysRevE.95.013004},
journal = {Physical Review E},
issn = {2470-0045},
number = 1,
volume = 95,
place = {United States},
year = {2017},
month = {1}
}

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