Long-Life Notch Strength Reduction Due to Local Biaxial State of Stress

[+] Author and Article Information
B. N. Leis

Battelle’s Columbus Laboratories, Columbus, Ohio

T. H. Topper

Department of Civil Engineering, University of Waterloo, Waterloo, Ontario, Canada

J. Eng. Mater. Technol 99(3), 215-221 (Jul 01, 1977) (7 pages) doi:10.1115/1.3443522 History: Received May 27, 1976; Revised September 28, 1976; Online August 17, 2010


An explanation for the observed difference between the values of the long-life, fatigue-notch strength-reduction factor (Kf ) and the elastic stress concentration factor based on the influence of biaxial-notch root stresses is presented for a limited class of problems for which the local stresses are elastic. Results of three-dimensional linear elasticity solutions for notch stresses are reviewed and then used in conjunction with a biaxial fatigue criterion suitable for elastic straining to predict values of Kf for a variety of notched components for which values have been experimentally determined. Comparison of actual and predicted values of Kf indicates a close correspondence suggesting that the influence of local biaxial stresses on the life to crack initiation of notched components is responsible for the reduced notch severity observed in many of the experimental investigations of long-life (fatigue) notch sensitivity.

Copyright © 1977 by ASME
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