Experimental observation and modeling of the retardation of fatigue crack propagation under the combination of mixed-mode single overload and constant amplitude loads

Jeong Moo Lee, Byoung Ho Choi

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    It is well-known that one of the major characteristics of variable fatigue loads, especially overloads, is the retardation of the fatigue crack due to the complex interaction of many factors such as the overload ratio, the timing of overloads, the stress ratio, the yield stress of the material, the thickness of the structure, and the stress history. However, studies of the combined effect of mixed-mode I+II constant amplitude fatigue loadings and a mixed-mode I+II single overload on fatigue behavior are still scant. In this study, fatigue tests were conducted under mixed-mode I+II constant amplitude loadings with a mixed-mode I+II single overload, with reference to the variation of fatigue crack retardation. The formation of the overload plastic zone (OPZ) ahead of the crack tip under a mixed-mode I+II single overload is studied experimentally by the measurement of the shape and size of the OPZ. The behavior of fatigue crack propagation under mixed-mode loading conditions is examined by changing the loading mode of a single overload, and the relationship between the mixed-mode I+II single overload and the behavior of fatigue crack propagation in terms of the characteristics of the OPZ is evaluated. The empirical modeling of the fatigue life under mixed-mode I+II constant amplitude loadings is proposed by considering the characteristics of both the OPZ and the combination of the mode-mixity of mixed-mode I+II constant amplitude loadings and a mixed-mode I+II single overload.

    Original languageEnglish
    Pages (from-to)1848-1857
    Number of pages10
    JournalInternational Journal of Fatigue
    Volume31
    Issue number11-12
    DOIs
    Publication statusPublished - 2009 Nov

    Bibliographical note

    Copyright:
    Copyright 2009 Elsevier B.V., All rights reserved.

    Keywords

    • Fatigue crack propagation
    • Fatigue life
    • Mixed-mode I+II
    • Retardation
    • Single overload

    ASJC Scopus subject areas

    • Modelling and Simulation
    • General Materials Science
    • Mechanics of Materials
    • Mechanical Engineering
    • Industrial and Manufacturing Engineering

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