Prediction of Fatigue Threshold of Notched Components

[+] Author and Article Information
K. Tanaka

Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pa. 18015

Y. Nakai

Department of Mechanical Engineering, Osaka University, Suita, Osaka 565, Japan

J. Eng. Mater. Technol 106(2), 192-199 (Apr 01, 1984) (8 pages) doi:10.1115/1.3225698 History: Received March 14, 1983; Online September 15, 2009


A consistent method is proposed to predict significant properties concerning the notch fatigue threshold from three experimental data: the fatigue limit of smooth specimens, the threshold stress intensity range for a long crack, and the effective stress intensity range at the threshold for a long crack. Based on the model of the intrinsic crack combined with crack closure, the fatigue limits for crack initiation and fracture from a notch, the length of a nonpropagating crack, and the notch tip radius at the branch point are all derived in a consistent way. The predicted results are compared with the experimental data of a low-carbon steel, and good agreement is obtained.

Copyright © 1984 by ASME
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