基于数字图像相关法的薄板焊接变形研究

发布时间：2018-06-05 19:10

本文选题：焊接 + 数字图像相关法　；参考：《中国测试》2017年01期

【摘要】：针对薄板焊接结构的大变形研究,目前采用数值模拟方法计算量大且误差较大,传统的应变片等测量手段无法实现焊缝处的在线密集测量。该文提出基于数字图像相关法的非接触检测方法对大型Q235薄板进行平板堆焊变形测量,重点研究热输入对薄板面内面外变形规律的影响。实验结果表明:基于数字图像相关技术的焊接变形测量方法能够在线、动态、全场获取薄板变形数据;随着热输入的增大,薄板的Z向面外变形及横向/纵向的面内变形也越大;冷却结束后,在焊缝处及热影响区内,薄板的纵向应变较小,而横向应变较大。热输入影响下的薄板焊接变形规律为揭示薄板焊接变形机理提供可靠的依据,为焊接结构件提供准确的制造数据。
[Abstract]:For the research of large deformation of thin plate welded structure, the numerical simulation method is used to calculate the large amount of calculation and the error is large at present, the traditional measuring methods such as strain gauge can not realize the on-line intensive measurement of weld seam. In this paper, a non-contact detection method based on digital image correlation method is proposed to measure the deformation of large Q235 thin plate by surfacing welding. The influence of heat input on the deformation of thin plate in and out of the plane is studied. The experimental results show that the welding deformation measurement method based on the digital image correlation technology can obtain the deformation data of thin plate on-line and dynamically, and with the increase of heat input, After cooling, the longitudinal strain of the thin plate is smaller and the transverse strain is larger in the weld seam and heat affected zone. The deformation law of thin plate welding under the influence of heat input provides a reliable basis for revealing the deformation mechanism of thin plate welding and provides accurate manufacturing data for welded structural parts.
【作者单位】：西安交通大学机械工程学院机械制造系统工程国家重点实验室;广东顺德西安交通大学研究院;
【基金】：国家自然科学基金项目(51421004) 广东省公益研究与能力建设专项资金(2014A010104003)
【分类号】：TG404;TP391.41

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