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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:
janebillg@prodigy.net, 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

Information

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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