Abstract
Effects of the microstructures in a material on the thermal stress during thermal-shock were analyzed using a triangular spring-lattice model which was originally proposed by Sridhar et al, to analyze thermal contraction induced microcracking in single-phase ceramics. In the present study, maximum energies in a spring-lattice model were simulated for modified multi-phase polycrystalline materials with different microstructures. The simulations were carried out for variations of grain size, aspect ratio, and of physical properties of surrounding structures in the multi-phase polycrystalline structure which was observed in cermets. The results show that reductions of thermal stress were predicted by the changes of the geometry of grains and physical properties of surrounding structures.
