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.

本项目基于热弹性和光弹性的混合使用，开发了一种新的实验技术，以全场应力分离测量进行测量。使用开发的技术进行了几项实验研究，用于测量缺口和裂缝的应力场。获得的结果总结如下1。使用热弹性应力分析（TSA）和光弹性应力分析（PSA）的杂种测量技术开发了用于应力分离。主应力的总和可以通过TSA测量，而P *** PAL应力的差异和主应力的方向可以通过PSA测量。所有应力成分都可以从MOHR的应力圈确定。2。研究了带有圆形孔的负载板的应力分离。将实验结果与边界元素方法分析的结果进行了比较。发现通过提出的技术在实验中获得的应力成分与边界元素分析获得的应力分量相吻合。证明了提出的杂种测量应力分离的可行性3。采用了开发的杂化应力分离测量技术来确定在经过机械载荷的破裂板中所有个别应力分量的分布。将实验结果与边界元素方法分析的结果进行了比较。发现可以准确确定中心裂缝和边缘裂纹周围的所有单个应力成分。应力强度因子和J积分从测得的应力分布计算出来。为了准确评估J构成，新提出了近尖端独家域积分方法。发现这些断裂力学参数可以通过目前的技术进行良好的精度评估。