Further Investigation of a Relation for Cumulative Fatigue Damage in Bending

[+] Author and Article Information
S. S. Manson, A. J. Nachtigall, C. R. Ensign, J. C. Freche

Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio

J. Eng. Ind 87(1), 25-35 (Feb 01, 1965) (11 pages) doi:10.1115/1.3670753 History: Received June 17, 1964; Online December 08, 2011


The fatigue behavior of several steels, AISI 4130, E52100, and 304 ELC stainless, as well as that of a nonferrous alloy, 5456-H311, was investigated in rotating bending fatigue after these materials were subjected to a prestress for different cyclic histories. The data obtained corroborated the hypothesis proposed by the authors earlier that lines representing the S – log N relation of a material prestressed in varying amounts will intersect the S – log N line of the original material near a common point. A correlation was found between the stress at this intersection point and the ultimate tensile strength. Thus, the only requirements for establishing the fatigue behavior of a prestressed material in the range of stresses where the S – log N line is inclined are the S – log N line of the original material and the ultimate tensile strength. The importance of determining the new endurance limit of a material after prestressing was shown analytically. The omission from cycle ratio summations of cyclic histories applied below the original, but above the new, endurance limit of a material was shown for an illustrative example to result in a cycle ratio summation less than unity, which leads to unconservative estimates of fatigue life. Cyclic histories so applied can produce damage and must be taken into account. A new hypothesis based upon actual fatigue behavior and incorporating a cycle ratio-modified stress ratio factor is suggested, which holds promise for predicting more accurately the new endurance limit than most existing methods. Extensive additional tests are required to verify this concept.

Copyright © 1965 by ASME
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