ANALYSIS OF TEMPERATURE STRESS DISTRIBUTIONS IN THERMAL SHOCKED CERAMIC DISKS IN RELATION TO TEMPERATURE-DEPENDENT PROPERTIES/

An infrared irradiation heating method has previously been proposed as a technique for directly estimating thermal shock parameters from an electric charge. In this method, a thin circular disk is irradiated wi th infrared rays over its central area at a constant heat flux. In thi s report, we analyzed the temperature/thermal stress distributions in the disk in relation to the temperature-dependent material properties of ceramics, namely the temperature distributions relating to temperat ure-dependent thermal conductivity and thermal diffusivity, and the th ermal stress distributions relating to temperature-dependent thermal c onductivity, thermal diffusivity and thermal expansion. The results re veal that these temperature dependent properties yield marked effects on the temperature/stress distributions in the disk. A number of possi bilities are suggested for decreasing thermal stresses in ceramic stru ctures by selecting appropriate combinations of temperature-dependent properties.