セラミックスの耐熱衝撃性評価に関する研究 : 第2報, Na中急冷時の熱伝達率および熱応力

抄録

It is essential to evaluate thermal stresses with time and their distribution at quenching in order to estimate the thermal shock resistance of ceramics. Therefore, local heat transfer coefficients during forced convection at quenching in liquid sodium were obtained by experiments and numerical analyses. Using these results, average heat transfer coefficients were obtained as a function of initial temperature of a specimen and quenching medium when a ceramic specimen was falling through liquid sodium. Thermal stresses for a cylindrical body with a conical nose were analyzed numerically using the finite-element method, and maximum tensile stress and stress distributions were indicated in relation to Bi's number.