The Extension of a Macroscopic Crack at Elevated Temperature by the Growth and Coalescence of Microvoids

The extension of a macroscopic crack is analysed based on the crack-tip stress field in a creeping body and on models for micro-void growth. The growth rate of the macro-crack depends on the applied load, which is expressed through the path-independent integral C*. At low levels of C*, i.e., small crack growth rates, the void growth mechanism by diffusion prevails, whereas at high C*-values the voids grow mainly by creep.

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