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    STP942

    A Micromechanics Model of the Initiation of Grain-Boundary Crack in High-Temperature Fatigue

    Published: 01 January 1988


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    Abstract

    A continuum mechanics model which incorporated the recovery effect by diffusion of atoms is presented to explain the initiation of grain-boundary wedge-type crack in high-temperature fatigue. The direction of deformation is periodically changed in fatigue, and the crack initiation depends on the deformation history of the grain boundary. A theoretical calculation based on the present model was made on the grain-boundary crack initiation in high-temperature fatigue where the deformation is path-dependent. The calculation results satisfactorily explained the experimental observations in polycrystalline metallic materials.

    Keywords:

    fatigue, high temperature, micromechanics model, grain boundary, wedge-type crack, crack initiation, stress concentration, grain-boundary sliding, polycrystalline metallic materials


    Author Information:

    Tanaka, M
    Associate Professor and Research Associate, Mining College of Akita University, Akita,

    Iizuka, H
    Associate Professor and Research Associate, Mining College of Akita University, Akita,


    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24509S