Thermal effects in dislocation theory
The mechanical behaviors of polycrystalline solids are determined by the interplay between phenomena governed by two different thermodynamic temperatures: the configurational effective temperature that controls the density of dislocations, and the ordinary kinetic-vibrational temperature that contro...
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| Published in | Physical review. E Vol. 94; no. 6-1; p. 063004 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
United States
22.12.2016
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| Online Access | Get more information |
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| Summary: | The mechanical behaviors of polycrystalline solids are determined by the interplay between phenomena governed by two different thermodynamic temperatures: the configurational effective temperature that controls the density of dislocations, and the ordinary kinetic-vibrational temperature that controls activated depinning mechanisms and thus deformation rates. This paper contains a review of the effective-temperature theory and its relation to conventional dislocation theories. It includes a simple illustration of how these two thermal effects can combine to produce a predictive theory of spatial heterogeneities such as shear-banding instabilities. Its main message is a plea that conventional dislocation theories be reformulated in a thermodynamically consistent way so that the vast array of observed behaviors can be understood systematically. |
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| ISSN: | 2470-0053 |
| DOI: | 10.1103/PhysRevE.94.063004 |