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Mechanism Of Thermally Assisted Creep Crack Growth

Published online by Cambridge University Press:  15 February 2011

Leonardo Golubović  and
Dorel Moldovan
Leonardo Golubović
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV 26506
Dorel Moldovan
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV 26506
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Abstract

We use atomistic Monte-Carlo simulations to investigate the dynamics of cracks which sizes are smaller than the Griffith length. We demonstrate that such cracks can irreversibly grow proviso their size is larger than a certain critical length which is smaller than the Griffith length, as recently suggested [ L. Golubović and A. Peredera, Phys. Rev. E51, 2799 (1995)]. We show here that this thermally assisted creep crack growth is dominated by irreversible changes in the region of the crack tip, primarily in the form of dislocation emissions and nucleation of microcavities and voids. These processes act together during the crack growth: the crack tip region acts as a source for emissions of dislocations which subsequently serve as seeds for creation of vacancy clusters in a region away but still close to the crack tip. Eventually, passages between these vacancy clusters and the mother crack are formed and the crack thus increases in size. As this process repeats, the crack grows.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 107
Copyright
Copyright © Materials Research Society 1996

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