![]() ![]() Under these conditions the newly formed crack is subcritical and requires a finite increase in temperature difference before propagation will proceed. For short initial crack length, crack propagation occurs kinetically, with the total area of crack propagation proportional to the factor St2 (1-2v)/EG, where St is tensile strength, v is Poisson's ratio, E is Young's modulus, and G is surface fracture energy. ![]() Thermal stress crack instability occurs between two values of critical crack length. The criteria of crack stability are derived for a brittle solid uniformly cooled with triaxially constrained external boundaries. A fracture-mechanical theory is presented for crack propagation in brittle ceramics subjected to thermal shock. ![]()
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