An elementary discussion is presented about the development of microcracks and resulting macroscopic crack extension behavior in brittle polycrystalline materials in connection with three dimensional distribution of intrinsic thermal stress. A simple model was prepared on the basis of finite element method for the evaluation of grain by grain stress distribution. It was revealed that polycrystalline materials have characteristic three dimensional distribution of intrinsic stress, and the macroscopic crack extension resistance would be controlled by resulting three dimensional structures of damage which might be missed by two dimensional analysis. As an example, numerical simulations of macroscopic crack extension were carried out, and the three dimensional result was different from the two dimensional case. It was concluded that three dimensional interpretation is necessary to understand correctly the macroscopic crack extension behavior of brittle polycrystalline materials.
|Number of pages||10|
|Publication status||Published - 1998 Dec 1|
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