A Cumulative Damage Rule Based on the Knee Point of the S-N Curve

[+] Author and Article Information
S. Subramanyan

Mechanical Engineering, PSG College of Technology, Coimbatore, India

J. Eng. Mater. Technol 98(4), 316-321 (Oct 01, 1976) (6 pages) doi:10.1115/1.3443383 History: Received March 14, 1975; Revised August 02, 1975; Online August 17, 2010


Making use of a set of isodamage lines, a fresh concept for predicting the fatigue life, under variable amplitude loading, is presented. It is assumed that all isodamage lines converge at the knee point of a S-log N diagram. The life predictions based on this concept are closer to the experimental data than given by Miner’s linear damage rule. The concept is verified with the step-test data obtained on unnotched C-35 steel specimens in rotary bending. Several other reported experimental data in rotary bending tests also confirm the reliability of this simple damage rule.

Copyright © 1976 by ASME
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