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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, nikzach@umich.edu, srol@umich.edu
D.J. Srolovitz
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136, nikzach@umich.edu, srol@umich.edu
R.A. LeSAR
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, ral@lanl.gov
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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.

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