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

1.专家友好系统新算法的开发为了使专家友好系统更加有效，我们开发了一种新的算法。通常情况下，专家系统由几个独立的程序模块组成，它们必须容易地连接在一起，以便进行交互分析。利用MS-DOS系统中的一个子进程，解决了这些问题。最后，我们可以将疲劳强度估算系统、热冲击问题估算系统和可靠性分析系统结合起来。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评价结果的物理意义。在本研究中，利用载荷-位移曲线和缺陷尺寸、J积分值，建立了评价延性断裂稳定条件极限的系统。最后，将热应力评价体系与这些系统相结合，对热震现象有了更好的理解。疲劳强度评估专家系统的开发首先，将日本材料科学学会提供的、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。其次，利用原理1.将用FORTRAN语言编写的主程序结合到数据库系统中，即可完成对专家友好的疲劳强度评估系统。可靠性分析专家系统的开发通过将可靠性分析系统加入到该系统中，完成了全专家友好系统的开发。通过该系统可以方便地进行可靠性分析，给出从数据库系统中提取的载荷和疲劳强度数据的统计繁荣程度。反之，可以确定荷载和强度数据的离散度的容许界，以满足任意的可靠性水平。

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.