Plastic Strain Distribution at the Tips of Propagating Fatigue Cracks

[+] Author and Article Information
D. L. Davidson, J. Lankford

Southwest Research Institute, San Antonio, Texas

J. Eng. Mater. Technol 98(1), 24-29 (Jan 01, 1976) (6 pages) doi:10.1115/1.3443330 History: Received November 29, 1974; Revised March 26, 1975; Online August 17, 2010


The techniques of selected area electron channeling and positive replica examination have been used to study the plastic zones attending fatigue crack propagation in 304 SS, 6061-T6 aluminum alloy, and Fe-3Si steel. These observations allowed the strain distribution at the crack tip to be determined. The results indicate that the concepts of a monotonic and a cyclic plastic zone are essentially correct, with the strains at demarcation between these two zones being 3 to 6 percent. Strain distribution varies as r −1/2 in the cyclic zone and as ln r in the monotonic plastic zone. The strain distributions for all materials studied may be made approximately coincident by using a dimensionless parameter related to distance from the crack tip.

Copyright © 1976 by ASME
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