Analysis of Thermal Stresses in Cored Ceramic Bricks Used in Hypersonic Wind Tunnel Heaters.

摘要

The thermostructural response of cored ceramic bricks used in hypersonic wind tunnel heaters was analyzed. The objective was to gain an understanding of the mechanisms which can cause brick fractures. The analyses were carried out by computing (1) the gross heater thermal response which furnished boundary conditions for computation of (2) the detailed temperature distribution in a brick segment which was input to compute (3) the stresses and strains in the brick segment. State-of-the-art numerical analytical techniques were applied in each step. Yttria stabilized zirconia and alumina bricks were considered. The effects of point contacts between bricks and other stress affecting phenomena were also considered. Superposition was applied to define typical combinations of thermal and mechanical loadings which could cause brick stresses equal to the estimated brick ultimate strength. (Modified author abstract)