Development of practical Methods for Design and Reliablility Testing Based on Structura Reliability Engineering

基于结构可靠性工程的实用设计和可靠性测试方法的开发

基本信息

批准号：
60850021
负责人：
ICHIKAWA Masahiro
金额：
$ 1.92万
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：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

Based on structural reliability enquineering, this research project aims to develop methods for design and reliability testing which have theoretical basis and practical applicability. Methods without use of distribution forms, methods with use of distribution forms, and a computer program were developed.1. Development of methods without use of distribution forms(1) The method which uses the upper bound of the probability of failure, Pfgu, based on the mean and variance alone: A formula for Pfu was obtained for the case where no serious condition was imposed. This formula could give Pfu about 50% lowe than the value given by the existing formula. Using this new formula, the methods for design and reliability testing were developed and examined< The reliability index used in the second moment method was alos examined.(2) Method of proof testing of ceramics: Taking account of fracture occurrence during unloading, a testing method of assuring the minimum required strength was developed.(3) Method based on fuzzy set theory: Taking account of subjective fuzzyness into design and reliability tesing, a method of combining two or more subjective evaluation was developed.2. Development of methods with use of distribution forms(1) Reliability-based design method for variable amplitude fatigue: Considering scatter of the critical cumulative cycle ratio to fracture and that of the applied cumulative cycle ratio, a practical design method was developed.(2) Reliability-based design method for low cycle fatigue; The existing method based on ASME Boiler and pressure Vessel Code was examined, and a more rational method to take account of the scatter of fatigue life was devaloped.3. Development of computer programThe compute program for automatic construction of fault tree used in FTA was developed using PROLOG.

本研究项目以结构可靠性调查为基础，旨在开发具有理论基础和实际应用性的设计和可靠性测试方法。开发了不使用分发形式的方法、使用分发形式的方法以及计算机程序。 1．不使用分布形式的方法的开发 (1) 仅使用基于均值和方差的故障概率 Pfgu 上限的方法：对于没有施加严重条件的情况，获得了 Pfu 的公式。该公式可以使 Pfu 比现有公式给出的值低约 50%。利用这个新公式，开发并检验了设计和可靠性测试的方法<还检验了二阶矩法中使用的可靠性指标。(2)陶瓷的验证测试方法：考虑卸载时断裂的发生，进行测试(3)基于模糊集理论的方法：考虑设计和可靠性试验的主观模糊性，提出了两种或多种主观评价相结合的方法。2．利用分布形式开发方法（1）基于可靠性的变幅疲劳设计方法：考虑断裂临界累积循环比的分散性和应用累积循环比的分散性，开发了实用的设计方法。（2）基于可靠性的低周疲劳设计方法；对现有的基于ASME锅炉压力容器规范的方法进行了检验，提出了一种更合理的考虑疲劳寿命离散性的方法。 3．计算机程序的开发利用PROLOG开发了用于FTA中的故障树自动构建的计算机程序。