作　　者： ; ; ; ;

机构地区： 山东大学机械工程学院

出　　处： 《材料科学与工程学报》 2003年第2期231-233,共3页

摘　　要： 在陶瓷材料临界应力断裂理论的基础上 ,通过求解陶瓷圆球体第三类边界条件的瞬态温度场和瞬态热应力场 ,研究了陶瓷圆球的热冲击行为 ,建立了一个引起陶瓷圆球表面临界应力的临界温差表达式 ,并以此作为陶瓷圆球的抗热震参数。计算结果表明 ,陶瓷圆球体的临界温差大于相同Biot模数的无限大陶瓷平板的临界温差 。 Based on the critical stress fracture theory of ceramic materials, the thermal shock behaviors of ceramic ball was investigated by means of the calculations of transient temperature fields and transient thermal stresses for a ceramic ball under the third boundary conditions, according to which the formula of critical temperature difference leading to the critical stress at the surface as thermal shock resistance parameter for ceramic ball was obtained. It can be concluded from the calculation results that the critical temperature difference for ceramic ball is lower than that for infinite ceramic plate with the same Biot number, whereas the dimensionless time for the surface to attain the maximum thermal stress is shorter than that for infinite plate.

关 键 词： 陶瓷圆球 陶瓷材料 瞬态温度场 瞬态热应力 抗热震性 临界应力断裂理论 非稳态热传导

领　　域： [化学工程] [化学工程]