STP668

    Elastic-Plastic Fracture Mechanics Analyses of Notches

    Published: Jan 1979


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    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


    Author Information:

    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,


    Paper ID: STP35855S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP35855S


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