Cumulative Fatigue Damage With Random Loading

[+] Author and Article Information
R. R. Gatts

The General Engineering Laboratory, General Electric Company, Schenectady, N. Y.

J. Basic Eng 84(3), 403-408 (Sep 01, 1962) (6 pages) doi:10.1115/1.3657337 History: Received June 13, 1961; Online November 04, 2011


A general concept of the accumulation of fatigue damage is applied where stress amplitude is a random time function with a specified amplitude distribution. A differential equation relating damage accumulation to the amplitude distribution of stress is derived. This equation is applicable to both continuous and discrete distributions. Solutions of the equation are used to predict life under random loading on the basis of constant amplitude S-N data. Such predictions are compared for both continuous and discrete stress amplitude distributions and found in better over-all agreement with the data than comparable predictions by the linear rule.

Copyright © 1962 by ASME
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