作者：李润娟1, 王登峰1, 郭楠2
作者单位：1. 河南广播电视大学, 河南 郑州 450046;
2. 西安交通大学, 陕西 西安 710049
关键词：数字图像相关法;全场;全过程;局部焊接区域;实时
摘要：
针对板料焊接时温度场的极不均匀性导致应变场的复杂性,提出一种基于数字图像相关法的全场、全过程分析板料焊接变形情况的方法。首先,对板料表面进行预处理;然后,利用高速相机拍摄板料焊接及冷却自由变形的全过程,通过数字图像相关技术计算所有图像中变形点的位移;最后,直观地获得板料焊接全场的变形规律。通过对Q235钢板进行氩弧堆焊实验表明,将一种新的3D-DIC技术应用于在线焊接变形中,能得到试件表面在整个焊接过程的全场变形数据,并且在高温焊缝区获得准确的变形规律。该方法攻克长期以来不能实时测量高温焊缝处应变的难题,为数值模拟理论提供验证手段,对揭示焊接变形机理、解决矫正变形问题等具有重要意义。
Application and research of digital image correlation method for sheet metal welding deformation measurement
LI Runjuan1, WANG Dengfeng1, GUO Nan2
1. Henan Radio & Television University, Zhengzhou 450046, China;
2. Xi'an Jiaotong University, Xi'an 710049, China
Abstract: As the high temperature in the welding process, it always leads to a extreme inhomogeneous deformation in local welding area. So it is hard to measure deformation of welding real-time. A method is presented for obtain full-field and full-process deformation regularity of TIG welding based on DIC(digital image correlation) method. First of all, preprocess the sheet metal surface. Then, use two cameras to record the whole process of sheet metal welding and free deformation during cooling, and the displacements of all deforming points are all caculated by 3D digital image correlation technology. Finally, the deformation regularity of whole field of sheet metal and weld zone can be obtained intuitively. The TIG welding experiment of Q235 steel plate shows that a new 3D DIC technique applying in real-time welding deformation. This method can get the deformation curve at any point of the whole welding process and obtain the accurate deformation curve in high-temperature weld area. This method not only overcomes the problem that the deformation cannot be measured real-time in high-temperature weld area, but also provides a validation method for the numerical simulation theory. It has important significance in revealing the welding deformation mechanism and providing predict of correcting deformation.
Keywords: digital image correlation method;full-field;full-process;local welding area;real-time
2015, 41(7): 33-36 收稿日期: 2014-11-8;收到修改稿日期: 2015-1-7
基金项目:
作者简介: 李润娟(1979-),女,河南三门峡市人,讲师,硕士,研究方向为机械设计及制造。
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