Wedge crack growth enhanced by vacancy diffusion under creep conditions
- 1 November 1971
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 24 (191) , 1215-1220
- https://doi.org/10.1080/14786437108217079
Abstract
The creep failure of polycrystalline materials is discussed in terms of a grain boundary sliding mechanism. In the proposed model wedge cracks are nucleated due to grain boundary sliding at triple point junctions. The resulting stable cracks grow to a critical size by further boundary sliding and by diffusion of vacancies to the defects. A failure condition is given which relates the time to fracture to the creep rate, temperature and diffusion characteristics of the material.Keywords
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