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Development of Hybrid Stress Measurement Technique Using Thermoelasticity and Photoelasticity and Its Application to Experimental Investigation of Fetting Problems.

利用热弹性和光弹性的混合应力测量技术的发展及其在蠕动问题实验研究中的应用。

基本信息

批准号：
12450050
负责人：
SAKAGAMI Takahide
金额：
$ 8.58万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

The present project developed a new experimental technique of full-field stress separation measurement based on the hybrid use of thermoelasticity and photoelasticity. Several experimental investigations were carried out for measuring stress field around notches and cracks using the developed technique. The results obtained are summarized as follows.1. A hybrid measurement technique using both of thermoelastic stress analysis (TSA) and photoelastic stress analysis (PSA) developed for stress separation. The sum of principal stresses can be measured by TSA, while the difference of p***pal stresses and direction of principal stress can be measured by PSA. All of the stress components can be determined from the Mohr's stress circle.2. Stress separation of a loaded plate with a circular hole was investigated. The experimental results were compared with results of boundary element method analysis. It was found that the stress components experimentally obtained by the proposed technique coincided with those obtained by the boundary element analysis. Feasibility of the proposed hybrid measurement for stress separation is demonstrated.3. The developed hybrid stress separation measurement technique was applied for determining distribution of all individual stress components in cracked plates subjected to mechanical load. The experimental results were compared with results of boundary element method analysis. It was found that the all individual stress components around the center crack and the edge crack can be accurately determined. Stress intensity factors and the J-integrals were calculated from the measured stress distribution. For the accurate evaluation of J-integral, near tip exclusive domain integral method was newly proposed. It was found that these fracture mechanics parameters can be evaluated with good accuracies by the present techniques.

本项目开发了一种基于热弹性和光弹性混合使用的全场应力分离测量新实验技术。利用该技术对缺口和裂纹周围的应力场进行了实验研究。主要研究结果如下：1.提出了一种利用热弹性应力分析（TSA）和光弹性应力分析（PSA）进行应力分离的混合测量技术。TSA可以测量主应力之和，而PSA可以测量p* pal应力之差和主应力方向。所有的应力分量都可以由莫尔应力圆确定。研究了含圆孔板在载荷作用下的应力分离问题。将实验结果与边界元法分析结果进行了比较。结果发现，所提出的技术实验得到的应力分量与边界元分析得到的应力分量相吻合。论证了所提出的应力分离混合测量方法的可行性.本文提出的杂交应力分离测量技术可用于确定裂纹板在机械载荷作用下各应力分量的分布。将实验结果与边界元法分析结果进行了比较。结果表明，该方法可以准确地确定中心裂纹和边缘裂纹周围的各个应力分量。应力强度因子和J积分计算从测量的应力分布。为了精确计算J积分，提出了近端专属区域积分法。结果发现，这些断裂力学参数可以评价具有良好的精度，通过本技术。