Development of Optimum Proof Testing Method of Structural Ceramics

结构陶瓷最佳验证测试方法的开发

基本信息

批准号：
01850021
负责人：
ICHIKAWA Masahiro
金额：
$ 4.86万
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
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01850021/
关键词：
Fine Ceramics Structural Ceramics Proof Test Reliability 信頼性ファインセミラックス

项目摘要

The aim of this research is to develop the optimum method of proof testing of structural ceramics. The optimum method implies such a method by which the highest probability of surviving proof testing is attained under the condition that S_<fmin>*S_d, where S_<fmin> is the minimum strength after proof testing and S_d is the required strength. The principal results of the research are summarized as follows.1. The optimum proof testing method was first studied for the case of uniform stress distribution. It was found that the optimum testing method is to use the maximum unloading rate available and the test load which satisfies S_<fmin>=S_d under this unloading rate.2. The optimum proof testing method was then studied for the case of non-uniform stress distribution. This case Is Important as real machine components are generally subjected to non-uniformly distributed stresses. It was found that the optimum testing method is to use the maximum unloading rate available and the test load whi … More ch satisfies S_<fmin>=S_d at the point of the maximum stress in the component.3. The influence of the K-V relation on the effect of proof testing was studied by means of computer simulation, where K is the stress intensity factor and V=da/dt is the stable crack growth rate. It was found that when the unloading rate is larger than the critical unloading rate, exterpolation of the first region's K-V relation to the second and third regions does not result in substantial error in calculation of the minimum strength after proof testing and the probability of surviving the proof test.4. A method for estimating the critical unloading rate was proposed, and the usefulness of this method was demonstrated experimentally.5. For application of proof testing to ceramic bearing balls, the statistical properties of the ring crack initiation strength and the final fracture strength under crushing load were clarified experimentally. Furthermore, a probabilistic theory for interpreting the experimental results was proposed.6. Proof testing of Si_3N_4 bearing balls was conducted and importance of unloading rate was demonstrated experimentally. Less

在S_ <fmin>*S_D的情况下，实现了最佳方法的最佳方法。 S_D是所需的强度。在此卸载下，对于不均匀的条纹应力分布而言，最佳的证明测试方法很重要。 …更多的s_ <fmin> = s_d在组件中的最大应力点处。3。裂纹生长速率。发现卸载速率是关键的卸载速率，即Therst区域的K-V与第二个区域的关系和IRD区域的关系。预防测试。4提出了一种估计关键的卸载率的方法。5。用于陶瓷轴承球的应用，环裂纹启动强度的统计特性和在压碎负载下的最终断裂强度.6。