Effects of residual stress on crack growth of silicon nitride balls under cyclic pressure loads
Effects of residual stress on crack growth of silicon nitride balls under cyclic pressure loads
复制标题
循环压力载荷下残余应力对氮化硅球裂纹扩展的影响
DOI：
10.1117/12.851650
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
E. Santos
中科院分区：
文献类型：
--
作者：
J. Koga;K. Kida;E. Santos
为了研究氮化硅陶瓷球在循环压力载荷下的劈裂失效机理，对预裂纹陶瓷球进行了疲劳试验。在我们以前的工作中，我们发现球的劈裂失效是由预裂纹引起的，预裂纹是由维氏压头在球的赤道上引发的。在本工作中，为了进一步研究这一现象，我们进行了两个尺寸的球（4.762毫米和9.525毫米）的疲劳试验。重点研究了初始裂纹长度为0.260 ~ 0.290μm的裂纹扩展行为，并讨论了钢球直径对疲劳强度的影响。基于两种球的经验特征，我们发现每个球的等效应力强度因子范围的初始阈值界限是不同的。为了研究这一点，我们使用X射线应力测量方法测量了残余应力。
In order to examine the mechanism of splitting failures of silicon nitride balls under cyclic pressure loads, we carried out the fatigue tests of pre-cracked balls. In our previous works, we discovered that splitting failures of the balls were caused by pre-cracks which were initiated on their equators by Vickers indenter. In the present work, in order to further investigate this phenomenon, we carried out fatigue tests of two size balls (4.762mm and 9.525mm). We focus on the growth behavior of cracks whose initial length ranged from 0.260 to 0.290μm and discuss about the effects of ball diameters on the fatigue strength. Based on the empirical features of the two balls, we found that the initial threshold limits of the equivalent stress intensity factor ranges ▵Keq for each ball were different. In order to look into this, we measured the residual stresses using the X-ray stress measuring method.