Statistics of Crack Growth of a Superalloy Under Sustained Load

[+] Author and Article Information
J. N. Yang

School of Engineering and Applied Science, The George Washington University, Washington, D.C. 20052

R. C. Donath

Materials Laboratory, AFWAL/MLLN, Air Force Wright Aeronautical Laboratories, WPAFB, Ohio 45433

J. Eng. Mater. Technol 106(1), 79-83 (Jan 01, 1984) (5 pages) doi:10.1115/1.3225680 History: Received July 06, 1983; Online September 23, 2009


A statistically-formulated fracture mechanics model for crack growth under sustained load is used to analyze crack growth data from 23 compact tension specimens of IN100, a turbojet engine disk material. The procedures characterize crack growth rates assuming that the growth rate is a lognormal random variable. The mean and standard deviation of the growth rate are determined from test data using the method of maximum likelihood. From these estimates, a lognormal creep crack growth rate model is developed from which is derived a statistical distribution of the crack size at any time. The distribution of time to reach some critical crack size is also presented. These distributions allow for the determination of the effect of hold time in the loading cycle on the life prediction of gas turbine engine disks.

Copyright © 1984 by ASME
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