Combined Bending-Torsion Fatigue Reliability of AISI 4340 Steel Shafting With Kt = 2.34

[+] Author and Article Information
Dimitri Kececioglu, Louie B. Chester, Thomas M. Dodge

Aerospace and Mechanical Engineering Dept., The University of Arizona, Tucson, Ariz.

J. Eng. Ind 97(2), 748-760 (May 01, 1975) (13 pages) doi:10.1115/1.3438641 History: Received July 09, 1974; Online July 15, 2010


Results generated by three, unique fatigue reliability research machines which can apply reversed bending loads combined with steady torque are presented. Six-inch long, AISI 4340 steel, grooved specimens with a stress concentration factor of 2.34 and RC 35/40 hardness were subjected to various combinations of these loads and cycled to failure. The generated cycles-to-failure and stress-to-failure data are statistically analyzed to develop distributional S-N and Goodman diagrams. Various failure theories are investigated to determine which one represents the data best. The effect of the groove and of the various combined bending-torsion loads on the S-N and Goodman diagrams are determined. Three design applications are presented. The third one illustrates the weight savings that may be achieved by designing for reliability.

Copyright © 1975 by ASME
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