The Statistical Nature of Fatigue Crack Propagation

[+] Author and Article Information
D. A. Virkler, B. M. Hillberry

School of Mechanical Engineering, Purdue University, West Lafayette, Ind. 47907

P. K. Goel

Department of Statistics, Purdue University, West Lafayette, Ind. 47907

J. Eng. Mater. Technol 101(2), 148-153 (Apr 01, 1979) (6 pages) doi:10.1115/1.3443666 History: Received September 12, 1978; Online August 17, 2010


A statistical investigation of the fatigue crack propagation process was conducted. Sixty-eight replicate constant amplitude crack propagation tests were conducted on 2024-T3 aluminum alloy. From the experimental data, the distribution of N was found to be represented best by the 3-parameter log-normal distribution. Six growth rate calculation methods were investigated and a modified secant method was found to introduce the least amount of error into the growth rate data. No one single distribution was found to describe the distribution of da/dN. A prediction scheme using the distribution parameters of da/dN was partially successful.

Copyright © 1979 by ASME
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