光学精密工程2012，Vol.20Issue(7)：1636-1644,9.DOI:10.3788/OPE.20122007.1636
数字图像相关法测量金属薄板焊接的全场变形
Measurement of full-field deformations in metal sheet welding processes by image correlation method
摘要
Abstract
A new three-dimensional deformation measurement method was proposed based on digital image correlation and binocular stereovision to measure the full-field deformation in metal sheet welding processes. Firstly, an algorithm based on a seed point was proposed to provide a reliable initial value for the least-square nonlinear optimization in the correlation matching. Then, the algorithms for three-dimensional coordinate reconstruction, three-dimensional displacement and the strain calculation were discussed separately. Finally, based on these algorithms and the VC+ + 6. 0 platform, a welding deformation measurement system was developed for the full-field deformation of metal sheet welding. With self-developed image acquisition devices and a standard material testing machine, a steel standard tensile test and a welding deformation measurement test were conducted to validate the performance of proposed mthod. Experimental results demonstrate that the accuracy of strain measurement is not lower than 0.5%, which is very close to that of a extensometer and the measured 3-D displacement time history is reasonable. It concludes that the proposed method can satisfy the requirements of non-contact, higher precision, and it is a more intuitive way for full-field deformation measurement during metal sheet welding processes.关键词
双目视觉/图像相关法/种子点匹配/薄板焊接/全场变形Key words
binocular vision/ digital image correlation/ seed matching/ metal sheet welding/ full-field deformations分类
矿业与冶金引用本文复制引用
胡浩,梁晋,唐正宗,卢岗..数字图像相关法测量金属薄板焊接的全场变形[J].光学精密工程,2012,20(7):1636-1644,9.基金项目
国家自然科学基金资助项目(No.50975219 （）
No.50975221) （）
