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    Volume 4, Issue 2 (February 2015)

    Special Issue Paper

    Characterization of Threshold Stress Intensity as a Function of Near-Tip Residual Stress: Theory, Experiment, and Applications

    (Received 9 March 2014; accepted 6 October 2014)

    Published Online: 28 February 2015

    CODEN: MPCACD

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    Abstract

    Threshold stress intensity, ΔKth, is not a material constant, but a variable that is extremely sensitive to load history. This effect has nothing to do with crack closure. It is associated with the influence of near-tip residual stress, σ*, on instantaneous resistance of crack tip surface layers to failure under atmospheric conditions. An analytical procedure is proposed to estimate σ* under constant amplitude loading as well as after tensile or compressive overloads. An experimental procedure is proposed to determine ΔKth under these loading conditions. ΔKth estimates obtained under a variety of overloads and underloads as well as under constant amplitude loading show an excellent correlation with computed σ*. The proposed experimental procedure and analytical relationships appear suitable for adoption as standard practice for an engineering application of threshold stress intensity under variable amplitude loading.


    Author Information:

    Sunder, R.
    BiSS (P) Ltd., Bangalore,


    Stock #: MPC20140037

    ISSN:2165-3992

    DOI: 10.1520/MPC20140037

    Author
    Title Characterization of Threshold Stress Intensity as a Function of Near-Tip Residual Stress: Theory, Experiment, and Applications
    Symposium ,
    Committee E08