SEDL / STP / STP942-EB / STP24509S

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

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,

Pages: 11    Published: Jan 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.