Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock
Fracture characteristics of silicon nitride ceramic ball subjected to thermal shock
复制标题
氮化硅陶瓷球热冲击断裂特性
DOI：
10.1007/s10853-016-9855-1
复制
发表时间：
2016
影响因子：
4.5
通讯作者：
Shinya Matsuda
中科院分区：
文献类型：
--
作者：
浦長瀬 正幸; 松本 龍介;松田伸也，黄木景二;Shinya Matsuda
本研究的目的是阐明轴承中使用的陶瓷球在受到热冲击时的断裂特性。首先，对各种尺寸的陶瓷球进行水淬试验。然后观察断口形貌和断口表面。经受热冲击后，在陶瓷球表面观察裂纹扩展和分支行为。然后在破裂的陶瓷球的裂纹表面观察到制造缺陷。接下来，从理论上讨论了使用热冲击断裂起始温度差的 FEM 分析计算出的断裂强度与根据制造缺陷尺寸计算出的等效裂纹长度之间的关系，以引入虚拟裂纹模型。结果得出结论，可以通过应用基于不同断裂类型的断裂强度测试获得的实验数据的虚拟裂纹模型来估计该关系，即温度差取决于制造缺陷的大小。最后，基于二参数Weibull分布的结果结合虚拟裂纹模型对温差散射进行了理论上的讨论。
The aim of this study was to clarify the fracture characteristics of ceramic balls, as used in bearings, when subjected to thermal shock. First, water-quench tests were performed on ceramic balls of a range of sizes. The fracture morphology and fracture surface were then observed. The crack propagation and branching behaviors were observed on the surfaces of the ceramic balls after they had been subjected to thermal shock. Manufacturing flaws were then observed on the surface of the fractures in the ruptured ceramic balls. Next, the relationship between the fracture strength, as calculated using a FEM analysis of the temperature difference at thermal shock fracture initiation and the equivalent crack length calculated from the manufacturing flaw size, was theoretically discussed to introduce a virtual crack model. As a result, it was concluded that the relationship can be estimated by applying a virtual crack model based on experimental data obtained from fracture strength tests for the difference fracture type, i.e., the temperature difference depends on the size of the manufacturing flaw. Finally, the temperature difference scatter was theoretically discussed based on the results of the two-parameter Weibull distribution in conjunction with a virtual crack model.