Crack path prediction of thermal cracks arising in self-stressed two-phase brittle compounds
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The crack path prediction of thermal cracks in self-stressed two-phase compounds subjected to uniform and nonuniform temperature distributions, respectively, has been studied by using the finite element method as well as by applying an appropriate crack growth criterion. A series of different self-stressed two-phase solids subjected to uniform as well as nonuniform temperature distributions, respectively, have been investigated. A comparison of the numerically obtained results in case of the existence of a uniform temperature distribution in the cross sections of two-phase composite structures for both the thermal crack paths and the corresponding fracture mechanical data at the crack tips with the experimental results gained from associated cooling experiments showed a good agreement.
In addition, the influence of additional local temperature changes onto the prospective thermal crack paths has been investigated by means of the crack growth criterion already mentioned. Thereby some remarkable effects of interference between the centers of local temperature changes located in the vicinity of the tips of thermal cracks and their further crack paths could be stated. This interference is also observable concerning the corresponding fracture mechanical parameters at the tips of the arising curvilinear thermal cracks.
KeywordsStress Intensity Factor Energy Release Rate Crack Path Uniform Temperature Distribution Thermal Crack
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