Development of Strength Confirmation Testing Method of Ceramics by Reliability Engineering

可靠性工程陶瓷强度确认测试方法的开发

基本信息

批准号：
04555028
负责人：
ICHIKAWA Masahiro
金额：
$ 5.82万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

The aim of this research is to develop the method of strength confirmation testing of ceramics by the reliability engineering. The principal results of the research are summarized as follows.1.The mean reliability was applied to the determination of design-allowable stress S_a for the case where the material strength follows a two-parameter Weibull distribution. It was found that for the case when the shape parameter alpha is known and only the scale parameter beta is unknown, the design-allowable stress S_a was obtained analytically and for the case when both alpha and beta are unknown, S_a was obtained numerically.2.The mean reliability was applied to the estimation of the size of reliability for the case when a design-allowable stress is determined by reliability R and confidence level C.It was found that for the case when the strength follows a normal distribution and Weibull distribution, the mean reliability was obtained analytically or numerically and for the case when the distr … More ibution of strength is unknown, the lower limit of the mean reliability was obtained by the product reliability R by confidence level C regardless of the distribution of strength.3.The ring crack initiation load was studied for a ceramic ball from a statistical point of view experimentally. The ring crack initiation load P_R was much larger than the static load rating given by the ISO method for steel bearings. The former is about ten times of the latter.4.Which of the inter-ball variability and the intra-ball variability is responsible for the scatter of the ring crack initiation load P_R of ceramic bearing balls was studied experimentally. It was found that scatter of P_R evaluated by measuring P_R at per single position per ball is mainly due to intra-ball variability or spatial variation of P_R within one ball.5.The mechanism of crushing fracture of ceramic bearing balls was studied experimentally. It wa found that a radial crack led to final fracture.6.The rolling fatigue of ceramic bearing balls was studied experimentally. It was found that the rolling fatigue life followed approximately a two-parameter Weibull distribution. Less

这项研究的目的是开发可靠性工程对陶瓷测试的强度确认方法。研究的主要结果总结如下。1。对于确定材料强度遵循两参数Weibull分布的情况，将平均可靠性应用于确定可允许应力S_A的确定。已经发现，对于形状参数alpha已知并且只有比例参数β尚不清楚的情况，可以在分析上获得设计 - 可允许的压力S_A，并且对于alpha和beta均未知的情况下，S_A均未清楚地获得。遵循正态分布和威布尔分布，平均可靠性是通过分析或数值获得的，对于区域的情况，强度更多的情况是未知的，置于置信级C可以通过置信度C获得了平均可靠性的下限，而不管强度的分布如何。3。从固定的固定点上研究了一个陶器的固定型，从而使环形裂纹的载荷研究了。环形裂纹启动负载P_R比ISO方法给出的钢轴承的静态负载额定值大得多。前者大约是后者的十次。4。实验研究了陶瓷轴承球的环裂纹启动载荷P_R的散射的哪种球间变异性和球内变异性。发现通过以每个球的每个位置测量P_R评估的P_R的散射主要是由于球内变异性或一个球内P_R的空间变化。5。实验研究了陶瓷轴承球碎裂的机制。 WA发现径向裂纹导致了最终的裂缝。6。陶瓷轴承球的滚动疲劳是通过实验研究的。发现滚动疲劳寿命大约是两个参数的威布尔分布。较少的