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Dynamic Simulation Of Crack Propagation With Dislocation Emission And Migration

Published online by Cambridge University Press:  15 February 2011

N. Zacharopoulos ,
D.J. Srolovitz  and
R.A. LeSAR
N. Zacharopoulos
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136, [email protected], [email protected]
D.J. Srolovitz
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136, [email protected], [email protected]
R.A. LeSAR
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, [email protected]
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Abstract

We present a simulation procedure for fracture that self-consistently accounts for dislocation emission, dislocation migration and crack growth. We find that the dislocation microstructure in front of the crack tip is highly organized and shows a complex temporal-spatial evolution. The final dislocation microstructure and the number of emitted dislocations immediately proceeding fracture varies rapidly with the loading rate. For high loading rates, fracture occurs at smaller loads with increasing loading rate. However, the load at fracture shows a maximum with respect to loading rates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 115
Copyright
Copyright © Materials Research Society 1996

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