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Title:Effect of range of stress and state of stress on fatigue strength of SAE 4340 steel
Author(s):Hanley, B.C.
Fatigue Strength
Abstract:A laboratory investigation was made to determine the effect of different states of stress on the fatigue strength of SAE 4340 Steel, and to study the influence of various mean stresses superimposed upon the alternating stresses. Groups of unnotched specimens were subjected to five different states of stress by means of fatigue tests involving: (a) bending, (b) torsion, and (c) three different combinations of bending and torsion. For each state of stress the mean stress was varied to include five different values ranging from zero to the maximum value that the specimen could sustain. The tests were conducted in modified “plate-bending” machines specially adapted to these experiments. An analysis of the 25 S-N curves obtained indicated that the endurance limit, as measured by the alternating stress amplitude, was practically independent of the value of the mean stress superimposed for the various combinations of bending and torsion investigated. For combinations of completely-reversed cycles of bending and torsion, the endurance limits agreed well with an empirical elliptic equation based on the observed endurance limits in bending only and torsion only.
Issue Date:1951-02
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 22
Genre:Technical Report
Sponsor:Office of Naval Research, U. S. Navy, Contract N6-ori-71, Task Order IV; Project NR-031-005
Rights Information:Copyright 1951 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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