Fractographic Reassessment of the Significance of Fatigue Crack Closure

    Volume 2, Issue 6 (June 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 1 June 2005

    Page Count: 18


    Sunder, R
    BiSS Research, 41A, 1stA Cross, AECS 2nd Stage, Bangalore,

    (Received 30 October 2003; accepted 23 August 2004)

    Abstract

    Experiments were performed on Al-alloy test coupons under specially programmed variable amplitude load sequences to assess crack closure as well as actual microscopic crack extension. Quantitative fractography of the fractures suggests that closure can account for only a fraction of observed load interaction effects. Much of the observed retardation may be attributed to the shielding effect of the overload plastic zone, which can occur even if the crack is fully open. The study also indicates that load sequence effects attributed to notch root stress-strain hysteresis can occur only if closure is absent.


    Paper ID: JAI12003

    DOI: 10.1520/JAI12003

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    Author
    Title Fractographic Reassessment of the Significance of Fatigue Crack Closure
    Symposium Fatigue and Fracture Mechanics: 34th Volume, 2003-11-21
    Committee E08