光弹性技术测试应力

Photoelastic technology is used to measure stress

有机玻璃等透明材料在航空航天工业、建筑业、电子工业和汽车工业上有广泛的应用,如何测量其初始应力和加工应力,消除其对构件的危害影响,确保工程结构的强度与安全具有重大意义。本文采用光弹性法,当此种受力模型置于偏振光场中,就会观察到由这种暂时双折射而引起的干涉条纹即受力模型的等差线和等倾线图,从而获取受力模型的主应力差和主应力方向。然后,借助于一些辅助手段,如:全息光弹法或者斜射法可以测得模型内的应力。

Transparent material such as plexi glass is commonly used in aviation, space flight, building construction, electronic industry and motorcar industry. So it is of great significance to study the measuring of its initial stress, processing stress and stress under different kinds of load to eliminate the danger to its structure and make sure its intensity and safety. In this paper, photo elasticity measured by the arithmetic model lines, such as dumping and map it in order to gain power by the model of the principal stress difference and principal stress directions. Then, by a similar theory could be converted into model stress actual components of stress. Then, through some of the aid, such as, holographic photoelastic law or headlamp can be measured within the model of stress.