A Kt-Based Method for Calculating LCF Life of Notched Specimens

[+] Author and Article Information
N. Merah, T. Bui-Quoc, M. Bernard

Departement of Mechanical Engineering, Ecole Polytechnique of Montreal, Montreal, Quebec, Canada H3C 3A7

J. Pressure Vessel Technol 116(4), 403-408 (Nov 01, 1994) (6 pages) doi:10.1115/1.2929608 History: Received September 02, 1993; Revised June 29, 1994; Online June 17, 2008


Under cyclic loading, the effect of stress raisers on the fatigue life depends upon several parameters, the most important being the stress concentration factor, the stress level, and the material notch sensitivity. In particular, in the low-cycle fatigue region, a number of procedures are currently used, but additional developments are required for improvement of the life prediction capabilities. In this paper, a method is proposed for calculating notched specimen low-cycle fatigue life from unnotched specimen data using as the main parameter the stress concentration factor combined with the applied stress level and the cyclic-hardening properties of the material. The proposed method is then applied to several materials with a variety of notch geometries to obtain the predicted lives. The correlation between the calculated lives and the experimental data is discussed in connection with the predictions obtained from Neuber’s and Zwicky’s relations.

Copyright © 1994 by The American Society of Mechanical Engineers
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