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Title:Local stress strain approach to cumulative fatigue damage analysis final report
Author(s):Morrow, JoDean; Martin, J. F.; Dowling, N. E.
Subject(s):Local Stress-strain
Fatigue Damage
Cumulative Fatigue
Load Histories
Abstract:A cumulative fatigue damage procedure for estimating the fatigue crack initiation life of notched structural members subjected to known load histories is outlined. This procedure assumes that a knowledge of the local cyclic stress-strain response of the metal at the most severely strained region in a member is sufficient to predict when a crack will form there. Some of the steps in this procedure that are of current interest and which are especially applicable to a local stress-strain approach are discussed. Alternative, approximate and/or abbreviated steps in the cumulative fatigue damage procedure are given wherever possible. Limitations of the method and areas where research is needed are pointed out. Cumulative fatigue test results for smooth specimens, notched plates and built-up box beams are compared to life calculations made using the local stress-strain approach. Cyclic deformation and fracture properties, used in the analysis, were obtained from tests on a limited number of axially loaded unnotched specimens. These examples indicate that a cumulative fatigue damage analysis based on the local stress-strain approach employing a minimum amount of materials test data can be used to make reasonable life estimates for members similar to many practical structural members. While there appears to be no serious limitations on the complexity of load histories that can be analyzed, the fatigue analysis of parts with complex geometric form is presently impractical without direct measurements of critical strains in the part.
Issue Date:1974-01
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 379
Genre:Technical Report
Sponsor:Aero Structures Department, Naval Air Development Center, Warminster, PA, Contract No. N00156-70-C-1256, 74/01
Rights Information:Copyright 1974 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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