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

可靠性工程搜索的陶瓷强度方法的目的。分布。仅刻度参数beta是未知的，可允许的应力S_A是通过分析获得的，并且对于alpha和beta的情况都未知。对于C ASE时，当设计应力由可靠性r和置信度确定时。强度是未知的，通过强度分布的置信度获得了乘积可靠性R的平均可靠性。3。环形裂纹启动负载以实验性观察。与钢轴承的ISO方法给出的静态载荷等级大约是后者的时间。4.4。通过实验研究，发现P_R @ P_R的单个位置的散射主要是由于球内变异性或空间变化P_R西澳州发现红色至最终骨折。6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.两个