A Fatigue Crack Growth Model for Single Overload Tests

[+] Author and Article Information
H. S. Goel, Satish Chand

Engineering Department, M.N.R. Engineering College, Allahabad-211004, India

J. Eng. Mater. Technol 116(2), 168-172 (Apr 01, 1994) (5 pages) doi:10.1115/1.2904268 History: Received November 01, 1991; Revised July 08, 1993; Online April 29, 2008


Crack growth rate experiments are conducted by applying an intermediate single overload cycle in constant amplitude load (CAL) tests. For a particular overload ratio, three to four tests are conducted by applying the overload cycle at different crack lengths. The loads are selected in such a way that for a given overload ratio, the size of the overload and CAL monotonic plastic zones are the same at each crack length. A functional form for the crack growth during the retardation was developed that accurately describes all the tests. For comparison, the corresponding CA-load tests are also conducted separately. Finally, a crack growth rate model is developed.

Copyright © 1994 by The American Society of Mechanical Engineers
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