Simple mechanics model and Hertzian ring crack initiation strength characteristics of silicon nitride ceramic ball subjected to thermal shock
Simple mechanics model and Hertzian ring crack initiation strength characteristics of silicon nitride ceramic ball subjected to thermal shock
复制标题
氮化硅陶瓷球热冲击简单力学模型及赫兹环裂纹萌生强度特性
DOI：
10.1016/j.engfracmech.2018.05.003
复制
发表时间：
2018
影响因子：
5.4
通讯作者：
Shinya Matsuda and Takeshi Nakada
中科院分区：
文献类型：
--
作者：
Yuichi Tadano;Jiun-Shyan Chen;Shinya Matsuda and Takeshi Nakada
研究了氮化硅陶瓷球在热震作用下的环裂纹萌生强度特性。在空气和真空中进行水淬火和炉冷操作后，对陶瓷球进行了球形压痕试验。由于高温空气中的热处理形成了非常薄的二氧化硅(SiO_2)层，因此环裂纹半径明显较小。此外，水冷陶瓷球的环裂纹萌生载荷和魏布尔形状参数随温差的增大而减小，受高温氧化的影响相对较小。这种现象主要是由于水淬火过程中产生的瞬时热应力引起的陶瓷球表面附近的微观损伤。提出了一种基于恒能量释放率准则的简单力学模型，用于将实验结果与理论预测进行比较，比较结果充分验证了上述陶瓷球在热震作用下的强度特性。
This study investigated the ring crack initiation strength characteristics of silicon nitride ceramic balls subjected to thermal shock. Sphere indentation tests were conducted on ceramic balls following water quenching and furnace cooling operations performed in air and vacuum. The ring crack radius was significantly smaller because of the very thin silicon oxide (SiO2) layer formed owing to heat treatment in air at high temperatures. In addition, the ring crack initiation load and Weibull shape parameter of water-quenched ceramic balls decreased with increasing temperature difference and remained relatively unaffected by the high-temperature oxidation. This phenomenon was mainly due to microscopic damage, which occurs near the surface of ceramic balls, caused by transient thermal stress developed during water quenching. A simple mechanics model based on the constant energy release rate criterion has been proposed for comparing experimental results obtained in this study against theoretical predictions, and results of the said comparison adequately verify strength characteristics of the aforementioned ceramic balls subjected to thermal shock.
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