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Title:Fatigue life and inelastic strain response under complex histories for alloy steel
Author(s):Dowling, N. E.
Subject(s):Fracture Life
Inelastic Strain
Complex Histories
Alloy Steel
Abstract:For quenched and tempered SAE 4340 steel, the inelastic strains measured during complex stress-strain histories are observed to be larger than would be estimated from constant amplitude test results. A cumulative fatigue damage procedure previously proposed is modified to account for this history dependence. Actual and calculated lives are compared for a variety of complex history fatigue tests on unnotched axially loaded specimens. To calculate fatigue lives using the modified procedure, it is necessary to have a stress-inelastic strain relationship obtained from constant amplitude fatigue tests. Initial overstraining at intermediate lives, and both initial and periodic overstraining at long lives, are employed for the constant amplitude tests so that the results are applicable to complex histories.
Issue Date:1972-04
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 354
Genre:Technical Report
Sponsor:Naval Air Dev Center, 72/04
Rights Information:Copyright 1972 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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