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Three-dimensional simulation of crack extension in brittle polycrystalline materials |
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| Authors: | S Kamiya T Yamauchi H Ab |
| Affiliation: | a Department of Mechanical Engineering, Tohoku University, Aramaki aza Aoba 01, Aoba-ku, Sendai 980-8579, Japan b Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan |
| Abstract: | Crack extension resistance in brittle polycrystals was investigated from the viewpoint of three-dimensional microcrack evolution. Even in the case of macroscopically two-dimensional cracks, inhomogeneous distribution of microscopic stress along the crack front gives rise to three-dimensional structures of extended crack surfaces. Numerical simulations of macroscopic crack extension were carried out, which showed that three-dimensional distribution of grain-by-grain thermal stress leads to a significant increase in the crack extension resistance. It was concluded that three-dimensional interpretation on the microscopic inhomogeneity is necessary for the correct comprehension of macroscopic crack extension behavior in brittle polycrystals. |
| Keywords: | Brittle polycrystals Anisotropic thermal expansion Three-dimensional residual stress distribution Microcracks Crack extension resistance |
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