急熱または急冷時のセラミックスの熱破壊について

抄録

In this paper, the derivation of the equations of temperature distribution and stress intensity factors in a material was shown based on the correlative equations of maximum thermal stresses and Biot's numbers and the equations of thermal conditions at abrupt cooling or heating. Then, the case that the material was subjected to cyclic thermal stresses was examined and the correlative equation between the time exposed to thermal stress σ(=0.9σ_max, σ_max=maximum thermal stress) and Boit's numbers was obtained. It was shown that the cyclic lives of the materials could be easily evaluated by use of these equations.
It is considered that the present method is widely applicable to estimate the possibility of thermal fracture of a material at abrupt cooling or heating.