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Effect Of Crack Blunting On Subsequent Crack Propagation

Published online by Cambridge University Press:  15 February 2011

J. SchiØtz ,
A. E. Carlsson ,
L. -M. Canel  and
Robb Thomson
J. SchiØtz
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130–4899
A. E. Carlsson
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130–4899
L. -M. Canel
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130–4899
Robb Thomson
Affiliation:
National Institute of Standards and Technology, Gaithersburg, MD 20899
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Abstract

Theories of toughness of materials depend on an understanding of the characteristic instabilities of the crack tip, and their possible interactions. In this paper we examine the effect of dislocation emission on subsequent cleavage of a crack and on further dislocation emission. The work is an extension of the previously published Lattice Greens Function methodology[1, 2, 3]. We have developed a Cavity Greens Function describing a blunt crack and used it to study the effect of crack blunting under a range of different force laws. As the crack is blunted, we find a small but noticeable increase in the crack loading needed to propagate the crack. This effect may be of importance in materials where a dislocation source near the crack tip in a brittle material causes the crack to absorb anti-shielding dislocations, and thus cause a blunting of the crack. It is obviously also relevant to cracks in more ductile materials where the crack itself may emit dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 95
Copyright
Copyright © Materials Research Society 1996

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References

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