Development of expert-friendly system for the evaluation of damage and strength of structures

开发专家友好的系统来评估结构的损伤和强度

基本信息

批准号：
62460077
负责人：
OKAMURA Hiroyuki
金额：
$ 4.29万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

1. Development of a new algorithm for the expert-friendly systemTo make a expert-friendly effectively, we have developed a new algorithm. Normally, expert system consists of several independent program modules and they must be linked easily for the interctive analysis. Using a child process in MS-DOS system, we have solved those problems. Finally we can combine a estimation system for fatigue strength, one for thermal shock problems and one for reliability analysis.2. Development of a expert system of the evaluation for the unstable ductile fracture of pipesIt is hard to understand the physical meaning of the result by using the normal elastic-plastic fracture. In the present research, the system to evaluate the limitation of stable condition in ductile fracture has been developed by using the load-displacement curve together with the flaw size, J integral values. Finally, evaluation system for thermal stresses is combined to those system and we get to understand the thermal shock phenomena well.3. Development of a expert system for the evaluation of the fatigue strengthFirst, the fatigue data, which is provided from the Society of Materials Science, Japan and is widely prevailed in Japan, was installed on the peripheral database system DBASE III. Next, by using the principle 1., a main program written in FORTRAN language is combined to the database system and the expert-friendly evaluation system for the fatigue strength evaluation can be completed.4. Development of a expert system for the reliability analysisTotal expert-friendly system was completed by adding the reliability analysis system to the above system. By the system, the reliability analysis can be executed easily by giving the statistical prosperity of the load and the fatigue strength data which is extracted from the database system. On the contrary, the tolerable boundary of the scatter of both the load and the strength data can be decided so as to satisfy the arbitrary reliability level.

1. 开发专家友好系统的新算法为了有效地实现专家友好系统，我们开发了一种新算法。通常，专家系统由多个独立的程序模块组成，它们必须易于链接以进行交互式分析。在MS-DOS系统中使用子进程，我们已经解决了这些问题。最后我们可以结合一个疲劳强度估计系统、一个热冲击问题估计系统和一个可靠性分析估计系统。2．管道不稳定延性断裂评价专家系统的研制用正常的弹塑性断裂很难理解其结果的物理意义。在本研究中，通过使用载荷-位移曲线以及缺陷尺寸、J积分值，开发了评估延性断裂稳定条件限制的系统。最后将热应力评估系统与这些系统相结合，使我们能够更好地理解热冲击现象。 3．疲劳强度评估专家系统的开发首先，将日本材料学会提供的、在日本广泛流行的疲劳数据安装在外围数据库系统DBASE III上。接下来，利用1.原理，将FORTRAN语言编写的主程序与数据库系统结合起来，就可以完成专家友好的疲劳强度评估系统。4．可靠性分析专家系统的开发通过在上述系统中添加可靠性分析系统，完成了整个专家友好型系统。通过该系统，通过给出载荷的统计丰富度和从数据库系统中提取的疲劳强度数据，可以方便地进行可靠性分析。相反，可以确定载荷和强度数据分散的容许边界以满足任意可靠性水平。