三维电子散斑干涉法在检测残余应力中的应用  

Application of 3D-ESPI in Inspection of Residual Stresses

作　　者：张熹 孙平 金华[2] 

机构地区：[1]上海七一一研究所,上海200090 [2]中国科学院上海光机所,上海201800

出　　处：《实验力学》2000年第2期125-131,共7页Journal of Experimental Mechanics

基　　金：上海市科技发展基金资助项目!(项目编号 :9750 1 4 0 2 7)

摘　　要：本文提出一种新的大错位三维电子散斑干涉法 ,并将其和钻孔法检测残余应力技术结合起来 .其特点一是利用三个激光器 ,从不同的方向照射被测物体 ,二是在被测物附近放置一参考物 ,利用大错位棱镜 ,使物体表面的信息和参考物上的信息都进入 CCD中 ,可以得到与三个位移场有关的电子散斑干涉条纹图 ,并可以运算和分离获得独立的 u,v和 w场信息 .本文介绍了大错位三维电子散斑干涉法的原理、方法和系统 ,并将其应用于用钻孔法释放残余应力而引起的 u,v和 w场的检测 .本文将实验结果与计算机模拟的结果作了对比 ,证实了方法的正确 ,并可以直接计算出残余应力的大小 .A 3D ESPI technique with large shearing is presented. In the technique, the specimen is illuminated by three laser beams coming from different directions, and a reference object in the optical field is also arranged. By using a special crystal lens with large shearing, which is placed in front of the CCD camera. The optical information from both the specimen and the reference object is collected by the CCD camera. Then by means of 3D ESPI image processing techniques, the u,v,w displacement fields are obtained independently. As an application, the technique is used in an experiment for residual stresses inspecting, where the displacement fields for a specimen after releasing its residual stresses are needed. The experiment is successful.

关 键 词：三维位移场 电子散斑干涉 残余应力 

分 类 号：O348[理学—固体力学]