STP1207

    A Void Growth Model Relating Fracture Toughness and Constraint

    Published: Jan 1994


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    Abstract

    Loading of a metal results in the nucleation of voids around particles. Further deformation results in void growth and coalescence. This work combines mathematical models for void nucleation, growth, and coalescence into a simulation of a ductile fracture to examine the effects of stress triaxiality and constraint loss on ductile fracture.

    Nucleation of voids from the particles is assumed to depend on the particle-matrix interface strength; subsequent void growth occurs according to equations developed by Rice and Tracey. The coalescence criterion involves a consideration of microstructural geometry.

    Two types of loading are considered: proportional loading and near crack tip loading. In the latter case, a near crack tip region with a relatively large plastic zone and with significant constraint loss is considered. Results include a two-parameter failure locus for initiation of ductile fracture, which predicts the effect of constraint on ductile initiation.

    Keywords:

    void nucleation, void growth, void coalescence, intervoid necking, cohesive strength, proportional loading, near crack tip loading, stress triaxiality, constraint loss


    Author Information:

    Miller, TC
    Graduate assistant and associate professor, Texas A&M University, College Station, TX

    Anderson, TL
    Graduate assistant and associate professor, Texas A&M University, College Station, TX


    Paper ID: STP13701S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP13701S


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