固体介质中超声应力场的定量测量*

回顾了基于动态光弹技术的超声应力测量方法,分析了各方法的优缺点。优化了现有光弹系统的前端光路,提出了电控旋转偏振和自动判读技术,研制了高稳定性的动态光弹实验系统。利用Senarmont补偿法实现了高精度的应力测量。多次重复测量结果表明,该系统测量结果的相对标准偏差小于1%。光弹测量数据与电测结果相比,其相似系数为99.95%,显著性水平小于0.001,证明了测量结果的可靠性。

Quantitative measurement of ultrasonic stress field in solid

In this paper, methods of ultrasonic stress measurement based on dynamic photoelastic technique is reviewed, and the advantages and disadvantages of these methods are compared. The forepart optical path of the existing photoelastic system is optimized, and the electrically controlled rotating polarization and automatic interpretation technology are proposed, then a dynamic photoelastic experiment system with high stability is developed. High precision stress measurement is realized by Senarmont compensation method. The results of repeated measurements show that the relative standard deviation of the system is less than 1%. Compared with the results of electrical measurement, the Pearson correlation coefficient is 99.95% and the significance level is less than 0.001, which proves the reliability of the measurement results.