Development of Real Time Stress Measurement System by Infrared Thermal Video System

作者开发了一种新的技术，用于应力分析和监测裂纹的红外热视频系统的帮助下。（1）提出了一种真实的应力分析方法。（2）用这种方法可以测量裂纹尖端的应力强度因子。(3)提出了一种估算J积分的方法。它可以通过测量裂纹尖端塑性区的温度分布来获得。(4)发展了监测裂纹类缺陷的方法。对三种不同的加热方法进行了试验。这些是（1）自加热方法。(2)高频电流法;（3）激光加热法。对它们进行了比较，并讨论了它们在实际问题中的应用.

The authors have developed new techniques for the stress analysis and the monitoring of a crack with the aid of an infrared thermal video system. The summary of results are as follows :(1) The method of a real time stress analysis has been developed(2) It is shown that the stress intensity factors at the crack tip can be measured by this method.(3) The method of estimating J-integral has been developed. It can be obtained by measuring the temperature distribution in the plastic zone at the crack tip.(4) The methods of monitoring crack-like-defects have been developed. Three different methods for heating the speciment have been examined. These are (1) self-heating method. (2) high frequency current method, and (3) laser heating method. They are compared each other and applications to the practical problems have been discussed.