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Surface Stress Effects On Fracture

Published online by Cambridge University Press:  15 February 2011

R.C. Cammarata  and
K. Sieradzki
R.C. Cammarata
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA
K. Sieradzki
Affiliation:
Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ 85287-6106, USA
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Abstract

The effects of surface stress on fracture are reviewed. Calculations by Thomson et al. seem to suggest that surface stresses do not affect cleavage fracture when the crack propagates in a self similar manner even though the surface stress can lead to large stresses near the crack tip. However, surface stresses may have an important effect on dislocation emission near the crack tip. A simple analysis is offered to show how these effects may be incorporated into a modified Rice ductile-brittle fracture criterion by adding a term to the unstable stacking energy that takes into account the energy to form an incipient ledge.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 409: Symposium Q – Fracture-Instablility Dynamics, scaling and Ductile/Brittle Behavior , 1995 , 87
Copyright
Copyright © Materials Research Society 1996

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