Abstract
The thermal shock cracking of solids is analyzed for a long cylinder subjected to a sudden change of temperature on its outer surface, based on a generalized heat conduction model in which the concepts of phase lags of temperature gradient and heat flux are introduced. The temperature field and associated thermal stress for an un-cracked cylinder are obtained in closed form. Then the thermal stress with an opposite sign is loaded on the crack surface to formulate the crack problem. The thermal stress intensity factor is deduced and given by a Fredholm integral equation. The cracking behavior is discussed and thermal shock resistance of the cylinder is evaluated according to the stress criterion and the fracture mechanics criterion, separately. The effects of phase lags of temperature gradient and heat flux and the crack size on the thermal shock resistance of the cylinder are also discussed.
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