A Probabilistic Model of Size Effect in the Fatigue Strength of Rounds in Bending and Torsion

[+] Author and Article Information
C. R. Mischke

Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011

J. Mech. Des 102(1), 32-37 (Jan 01, 1980) (6 pages) doi:10.1115/1.3254716 History: Received February 16, 1979; Online November 17, 2009


The use of a probabilistic premise to establish the relation of size to the attenuation of endurance strength in rounds, such as shafts subjected to bending or torsion is investigated. The method allows the designer to construct the appropriate expression for Marin fatigue strength reduction factor, kb , directly from fatigue tests that have been ordered. For probabilistic design procedures, the mean and standard deivation of the Marin fatigue strength reduction factor are required, and the method described allows these estimates to be made.

Copyright © 1980 by ASME
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