Digital image correlation using ring template and quadrilateral element for large rotation measurement
Digital image correlation using ring template and quadrilateral element for large rotation measurement
复制标题
使用环模板和四边形单元进行大旋转测量的数字图像相关
DOI：
10.1016/j.optlaseng.2012.02.014
复制
发表时间：
2012-07-01
影响因子：
4.6
通讯作者：
Wang, Ricao
中科院分区：
文献类型：
--
作者：
Zhang, Xiaochuan;Chen, Jinlong;Wang, Ricao
High accuracy measurement of the large rotation is a crucial issue in engineering. In this paper, the displacement hypothesis of quadrilateral element in finite element method (FEM) is chosen for digital image correlation (DIC) technique, and Newton-Raphson iterative method is selected to solve the partial differential equation to measure the displacement field. Because the ring template possesses rotation invariance and translation invariance, ring template matching technique is presented to estimate the integer pixel displacements of nodes which could make the initial value of the iterative method close to the real value. Simulated images are used to verify the performance of the improved DIC technique which shows that this method has a low request to the speckle pattern and the measurement range of the rotational angle is from 0 degrees to 360 degrees with high accuracy. Furthermore, the improved DIC technique is used to measure the large deflection deformation of the polyurethane specimen and the measured deformation is in accordance with the actual deformation of the specimen. All the results show that the improved DIC technique could be used to measure the large rotation and the application scope of DIC technique is extended. (C) 2012 Elsevier Ltd. All rights reserved.
