STP668: Elastic-Plastic Fracture Mechanics Analyses of Notches

    Hammouda, MM
    Research fellow and professor, Faculty of Engineering, University of Sheffield, Sheffield,

    Miller, KJ
    Research fellow and professor, Faculty of Engineering, University of Sheffield, Sheffield,

    Pages: 17    Published: Jan 1979


    Abstract

    Fatigue failures invariably start at a surface notch. Crack initiation is due to plasticity while crack propagation can continue in an elastically stressed material due to the crack generating its own crack tip plasticity.

    From elastic-plastic analyses, it is possible to predict the effect of notch plasticity on the behavior of short propagating cracks. Elastic-plastic finite-element analysis solutions to cracks in notch fields indicate that a crack will initially propagate at a decreasing rate until the crack can generate a crack tip plasticity that is greater than the elastic threshold stress intensity condition.

    Keywords:

    notch root radius, notch depth, crack initiation, crack propagation, nonpropagating crack, threshold stress intensity factor, plain fatigue limit, notch fatigue limit, stress concentration factors, strength reduction factors, notch stress-strain field, crack tip stress-strain field, bulk stress-strain field, elastic-plastic finite-element analysis


    Paper ID: STP35855S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP35855S


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