STP995V2

    Plasticity Near a Blunt Flaw Under Remote Tension

    Published: Jan 1988


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    Abstract

    Elastic-plastic analyses of a group of blunt-tipped crack-like flaws were performed. Elliptical, semicircular, and circular tip geometries were considered. Results show very minor excursions of the plastic zone along the crack faces in contained plasticity, even after the characteristic butterfly shaped crack-tip zone has developed. As a result of this yielding behavior, it was found that stress triaxiality predictions following from slipline theory significantly overestimate the elastic-plastic results. J-integral computations show that there is significant path dependency near the tip, which can be associated with the nonproportional stress histories and partial crack face unloading that was detected. The results should be important in applications of critical stress and J-integral concepts to fracture from crack-like imperfections.

    Keywords:

    elastic-plastic fracture, plasticity, finite-element analysis, plane strain, J, -integral, tip field, cracks, stresses, fracture mechanics, nonlinear fracture mechanics


    Author Information:

    Tracey, DM
    Mechanical engineers, U.S. Army Materials,

    Freese, CE
    Mechanical engineers, U.S. Army Materials,


    Paper ID: STP27704S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27704S


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