Development of stress analysis method by hybrid system combining photoelasticity with numerical method

光弹性与数值方法相结合的混合系统应力分析方法的发展

基本信息

批准号：
60460079
负责人：
OKAMURA Hiroyuki
金额：
$ 4.74万
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：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

项目摘要

1.Development of high speed F.E.M system;We developed high performance stress analysis system by combining image processing system for photoelasticity with high speed F.E.M system. As the F.E.M system was developed on 16-bit micro-computer, on-line real time procedure can be executed efficiently.2.Development of video system for photoelastic analysis;We developed image processing system for photoelastic fringe by using micro-computer and image frame memory. Basic image processing software such as smoothing, filtering were also developed by using C-language.3.Development of conversational hybrid system;We developed conversational hybrid system, which can compare the result of FEM analysis with the experimental results of photoelasticity. In this system, boundary shape of the specimen is acknowledged by the image processing procedure and is converted to the coordinate data. Then, finite element mesh, which satisfy those boundary condition, are generated and FEM analvsis is executed. The isochromatic fringe positions are calculated from the FEM result and those are superimposed on the image moritor of photoelasticity. The difference of both results are detected easily and are feed-backed to the calculation.4.Stress analysis of complicated structure by developed system;By using the developed image processing system, we conducted stress analysis for contact problem and cracked body. As a contact problem, two different size circle plates are pressed on each other and the stress distribution is analysed by the developed system. We could not find the good method to attain the final answer easily, we confirmed that the difference of the result of two methods are detected easily by the hybrid system. For the crack problem, we developed new method to analyse the mode I stress intensity factor from the image data easily. The results are compared with the theoretical one and satisfactory results are obtained.

1.高速F.E.M系统开发；将光弹性图像处理系统与高速F.E.M系统相结合，开发出高性能应力分析系统。由于有限元系统是在16位微机上开发的，可以高效地执行在线实时程序。2.光弹分析视频系统的开发；利用微机和图像技术开发了光弹条纹图像处理系统帧存储器。还利用C语言开发了平滑、滤波等基本图像处理软件。3.会话式混合系统的开发;我们开发了会话式混合系统，可以将有限元分析的结果与光弹性实验结果进行比较。在该系统中，样本的边界形状由图像处理程序识别并转换为坐标数据。然后，生成满足这些边界条件的有限元网格并执行有限元分析。根据有限元结果计算等色条纹位置并将其叠加在光弹性图像传感器上。两种结果的差异很容易检测出来并反馈到计算中。4.通过开发的系统进行复杂结构的应力分析;利用开发的图像处理系统，我们对接触问题和裂纹体进行了应力分析。作为接触问题，两个不同尺寸的圆板相互挤压，并通过开发的系统分析应力分布。我们找不到容易获得最终答案的好方法，但我们证实混合系统可以轻松检测到两种方法结果的差异。针对裂纹问题，我们开发了新方法，可以轻松地从图像数据中分析 I 型应力强度因子。结果与理论结果进行了比较，得到了满意的结果。