Evaluation of Methods for the Treatment of Mean Stress Effects on Low-Cycle Fatigue

[+] Author and Article Information
M. Doner, K. R. Bain, J. H. Adams

Detroit Diesel Allison Division, General Motors Corporation, Indianapolis, Ind. 46206

J. Eng. Power 104(2), 403-411 (Apr 01, 1982) (9 pages) doi:10.1115/1.3227294 History: Received December 15, 1980; Online September 28, 2009


Several methods proposed for the treatment of mean stress effects on time-independent low cycle fatigue (LCF) lifetime were critically evaluated using LCF crack initiation data on a number of materials used in gas turbine design. The methods evaluated included Jaske’s equivalent strain (εeq ) formulation, Manson ’s mean stress correction method and nonlinear Goodman diagram representation of the strain-controlled LCF data. LCF crack initiation data on STA Ti-6-4 (533K), Ti-5522S (783K), IN-706 (866K) and MAR-M246 (1033K) were utilized in the evaluations. The evaluations were carried out in terms of each method’s capability to back-predict the experimetnal data used in its construction. Also considered were the implications associated with the type and the extent of data required for each method.

Copyright © 1982 by ASME
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