Abstract
The cracking of grain boundary facets in polycrystalline materials showing anisotropic thermal expansion behaviour is controlled by several microstructural factors in addition to the intrinsic thermal and elastic properties. Of specific interest are the relative orientation of the two grains meeting at the facet, and the size of the facet; these factors thus introduce two statistical aspects to the problem. The criteria for facet fracture are critically reviewed. The statistical factors are then introduced to give quantitative data on crack density vs temperature. The theory is compared briefly with limited experimental measurements of Young's modulus for various rocks as a function of temperature.
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