Large deformation measurement scheme for 3D digital image correlation method
Large deformation measurement scheme for 3D digital image correlation method
复制标题
3D数字图像相关法大变形测量方案
DOI：
10.1016/j.optlaseng.2011.09.018
复制
发表时间：
2012-02
影响因子：
4.6
通讯作者：
Guo, Cheng
中科院分区：
文献类型：
--
作者：
Tang, Zhengzong;Liang, Jin;Xiao, Zhenzhong;Guo, Cheng
当参考图像与变形图像之间存在严重的去相关性时，数字图像相关（DIC）技术往往会遇到困难。对于大变形的情况，可以采用更新参考图像的方法，但这会引入累积误差。提出了一种结合改进的粗搜索法和更新参考图像法的大变形测量方案。对于一系列变形图像，相关性计算从种子点开始并扩展。提出了一种改进的粗搜索方法来计算种子点的初始相关参数，保证了相关计算在大变形情况下也能顺利进行。仅对于非常大的变形，更新参考图像。该方法不仅可以成功地测量出大变形量，而且可以控制累积误差。通过高分子材料拉伸试验和泡沫塑料压缩试验验证了该方案的可行性。实验结果表明，该系统可以成功地测量450%的拉伸变形和83%的压缩变形。
Difficulties often arise for digital image correlation (DIC) technique when serious de-correlation occurs between the reference image and the deformed image due to large deformation. An updating reference image scheme could be employed to deal with large deformation situation, however that will introduce accumulated errors. A large deformation measurement scheme, combining improved coarse search method and updating reference image scheme, is proposed in this paper. For a series of deformation images, the correlation calculation begins with a seed point and spreads out. An improved coarse search method is developed to calculate the initial correlation parameters for the seed point, which guarantees that the correlation calculation can be carried out successfully even in large deformation situation. Only for extremely large deformation, the reference image is updated. Using this method, not only extremely large deformation can be measured successfully but also the accumulated error could be controlled. A polymer material tensile test and a foam compression test are used to verify the proposed scheme. Experimental results show that up to 450% tensile deformation and 83% compression deformation can be measured successfully.
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