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Hot Spots from Dislocation Pile-up Avalanches

Published online by Cambridge University Press:  26 February 2011

William Grisé
William Grisé*
Affiliation:
[email protected], Morehead State University, Industrial and Engineering Technology, Dept. of IET, RM LC-105C, Morehead State University, Morehead, KY, 40351, United States, 606-783-2424, 606-783-2424
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Abstract

The model of localized adiabatic heating associated with release of a dislocation pile-up avalanche is described and re-evaluated. The model supplies a fundamental explanation of shear banding behavior in metal and non-metal systems. Now, a dislocation dynamics description is provided for more realistic assessment of the hot spot heating, for both straight dislocation pile-ups and circular loop pile-ups. Such a localized heating effect was overestimated in the earlier work, in part, to show the dramatic enhancement of the work rate, and the corresponding temperature build-up, potentially occurring in the initial pile-up release, say, at achievement of the critical dislocation mechanics-based stress intensity for cleavage. Proposed applications are to potentially brittle metal, ionic, and energetic material systems.

Keywords

dislocationsenergetic materialgrain size
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 896: Symposium H – Multifunctional Energetic Materials , 2005 , 0896-H06-03
Copyright
Copyright © Materials Research Society 2006

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