Evaluating angular deflections from the digital gradient sensing method with rigid-motion deleted
Evaluating angular deflections from the digital gradient sensing method with rigid-motion deleted
复制标题
删除刚性运动的数字梯度传感方法评估角度偏转
DOI：
10.1088/0957-0233/27/6/065202
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
Zhang Rui
中科院分区：
文献类型：
--
作者：
Zhang Rui
数字梯度传感方法用于测量由于透明平面固体中的局部应力而引起的光线的小角度偏转。该方法是基于二维（2D）数字图像相关（DIC）来测量光线的角偏转;然而，当试样受到加载时，DIC的变形测量并不完美，因为加载后试样表面存在小的面内和面外运动。这些缺点将导致测量的角偏转中的误差。讨论了不可避免的面内和离面运动对应力梯度的影响，并提出了消除这种影响的方法，以显示有机玻璃的纯应力梯度。
The digital gradient sensing method is used for measuring small angular deflections of light rays due to local stresses in transparent planar solids. The method is based on two-dimensional (2D) digital image correlation (DIC) to measure the angular deflection of light rays; however, when a specimen is subjected to loading, deformation measurement from DIC is not perfect because of the existence of small in-plane and out-of-plane motions of the test sample surface that occurred after loading. These disadvantages will lead to errors in the measured angular deflections. The influence of unavoidable in-plane and out-of-plane motions was discussed, and a method to eliminate the influence to show the pure stress gradient of polymethy methacrylate is demonstrated.