Energy-Release Rate and Crack Kinking Under Combined Loading

[+] Author and Article Information
K. Hayashi, S. Nemat-Nasser

Department of Civil Engineering, The Technological Institute, Northwestern University, Evanston, Ill. 60201

J. Appl. Mech 48(3), 520-524 (Sep 01, 1981) (5 pages) doi:10.1115/1.3157666 History: Received June 01, 1980; Revised October 01, 1980; Online July 21, 2009


Based on the maximum energy-release-rate criterion, kinking from a straight crack is investigated under the plane strain condition. Solutions are obtained by the method that models a kink as a continuous distribution of edge dislocations. The energy-release rate is expressed as a quadratic form of the stress-intensity factors that exist prior to the onset of kinking, and the coefficients of this quadratic form are tabulated for various values of the kink angle. The examination of the results shows that Irwin’s formula for the energy-release rate remains valid for any kink angle provided that the stress-intensity factors in the formula are taken equal to those existing at the tip of a vanishingly small kink.

Copyright © 1981 by ASME
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