Fatigue Under Wide Band Random Stresses Using the Rain-Flow Method

[+] Author and Article Information
P. H. Wirsching, A. Mohsen Shehata

Aerospace and Mechanical Engineering, The University of Arizona, Tucson, Ariz.

J. Eng. Mater. Technol 99(3), 205-211 (Jul 01, 1977) (7 pages) doi:10.1115/1.3443520 History: Received June 10, 1976; Revised April 19, 1977; Online August 17, 2010


A fatigue design procedure is proposed for the structural elements subjected to a stress process, modeled as stationary wide-band gaussian. This procedure, restricted to high cycle fatigue design, uses available constant amplitude material fatigue data and a modified, probability based, Palmgren-Miner (PM) rule. Statistical uncertainty in fatigue behavior and nonstatistical uncertainty in the PM rule are implicitly accounted for by treating the PM index at failure as a random variable. The rain flow method of counting stress cycles is used. The fatigue design algorithm requires only that the RMS and irregularity factor of the stress process be specified in addition to the constant amplitude S-N curve for the material.

Copyright © 1977 by ASME
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