Thermal Stress Analysis in Ceramic Disk Subjected to Thermal Quenching
Thermal Stress Analysis in Ceramic Disk Subjected to Thermal Quenching
复制标题
陶瓷盘经热淬火后的热应力分析
DOI：
10.2109/jcersj.103.923
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Takatsu
中科院分区：
文献类型：
--
作者：
T. Nishikawa;Y. Mizutani;Sawao Honda;M. Takatsu
为了通过淬火法评估陶瓷的抗热震性，评估样品中的热应力分布和历史非常重要。实验中无法直接测量淬火时的热应力。因此，对陶瓷盘淬火产生的温度分布进行了数值计算，并估计了瞬态热应力分布。计算出的最大热应力和所需时间分别作为相关方程。前一个最大热应力方程可用于评估陶瓷的耐热震性。断裂时间可以通过后一个最大热应力下的时间方程来估计。如果实验断裂时间与计算断裂时间一致，则认为断裂仅由热应力引起。此外，将这些方程与板坯样本的方程进行比较，以讨论热应力历史和分布的差异。评估了热常数的温度依赖性对抗热震性的影响。断裂过程中盘中积累的应变能也可以通过表面的拉伸热应力计算。
For evaluation of thermal shock resistance of ceramics by the quenching method, it is important to estimate the thermal stress distribution and history in the specimen. Thermal stress under quenching can not be measured directly in the experiment. Therefore, the temperature distribution generated by quenching was numerically calculated and the transient thermal stress distribution was estimated for the ceramic disk. The calculated maximum thermal stress and the time required were proposed as the correlative equations, respectively. The former equation of maximum thermal stress is useful to evaluate the thermal shock resistance of ceramics. The fracture time can be estimated by the latter equation of the time at the maximum thermal stress. If the experimental fracture time agrees with the calculated one, it is considered that the fracture occurs only by the thermal stress. Furthermore, these equations were compared with those of slab specimens to discuss the differences in thermal stress history and distribution. The effects of temperature dependence of thermal constants on thermal shock resistance have been evaluated. The strain energy accumulated in the disk during the fracture process was also calculated by the tensile thermal stress at the surface.