数字图像相关法焊接热影响区应变原位测量及应力计算

doi:10.3901/JME.2019.17.029

机械工程学报 ›› 2019, Vol. 55 ›› Issue (17): 29-34.doi: 10.3901/JME.2019.17.029

• 特邀专栏：焊接机器人 • 上一篇

数字图像相关法焊接热影响区应变原位测量及应力计算

宋育林^1,2, 白旭东^1,2, 陈小奇^1,2, 陈善本^1,2, 陈华斌^1,2

1. 上海交通大学材料科学与工程学院上海 200240;
2. 上海交通大学上海市激光制造与材料改性重点实验室上海 200240

收稿日期:2018-12-01 修回日期:2019-04-26 发布日期:2020-01-07
通讯作者: 陈华斌(通信作者),男,1977年出生,博士,副教授。主要研究方向为材料精密成型及智能制造。E-mail:hbchen@sjtu.edu.cn
作者简介:宋育林,男,1993年出生。主要研究方向为焊接自动化与智能化技术。E-mail:songyulin@sjtu.edu.cn
基金资助:
国家自然科学基金资助项目（51575348）。

Calculation and In-situ Measurement of HAZ Stress Based on Digital Image Correlation Method

SONG Yulin^1,2, BAI Xudong^1,2, CHEN Xiaoqi^1,2, CHEN Shanben^1,2, CHEN Huabin^1,2

1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240;
2. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240

Received:2018-12-01 Revised:2019-04-26 Published:2020-01-07

摘要/Abstract

摘要： 提出了焊接热影响区全场高温应变在线测量及评价方法，设计了一种新型具有抗高温烧损、随机分布特征的散斑点阵。为解决焊接电弧强弧光干扰问题，采用脉冲激光辅助光源和近红外窄带滤光系统获取清晰焊缝热影响区散斑图像。针对焊接热影响区焊接变形复杂性，开发了基于二阶形函数与双三次插值的反向组合型Gauss-Newton算法，获得焊接热影响区全场高温应变场。建立多维应力、应变空间加载规律的弹塑性增量本构关系，定量求解焊接热影响区的残余应力分布。结果表明，所研制的焊接全场高温应变视觉测量系统，为焊接接头全场高温应变测量及可靠性评估提供了高效、准确的表征手段。

关键词: 焊接热影响区, 数字图像相关, 原位测量, 残余应力

Abstract: An in-situ measurement and evaluation methods are proposed about the high temperature full field strain in the welding heated affected zone (HAZ). A novel speckle preparation method is developed. The random speckle pattern can survive at temperatures up the melt point of the base metal. A pulsed laser based auxiliary illumination and near infrared filtering system are utilized to suppress the intense welding arc and obtain the clear speckle pattern image in the HAZ during arc welding process. The inverse compositional Gauss-Newton algorithm with the second-order shape function and bi-cubic interpolation is developed for the welding deformation complexity in the HAZ. The incremental constitutive relations is built considering the multi-dimensional stress and strain space, and the full-field residual stress is calculated quantitatively in the HAZ. The results show that the digital image correlation (DIC) system setup can provide an effective and accurate characterization method for the full-field strain measurement and reliability assessment of the welded joint.

Key words: welding heated affect zone, digital image correlation, in-situ measurement, residual stress

中图分类号:

TG404

宋育林, 白旭东, 陈小奇, 陈善本, 陈华斌. 数字图像相关法焊接热影响区应变原位测量及应力计算[J]. 机械工程学报, 2019, 55(17): 29-34.

SONG Yulin, BAI Xudong, CHEN Xiaoqi, CHEN Shanben, CHEN Huabin. Calculation and In-situ Measurement of HAZ Stress Based on Digital Image Correlation Method[J]. Journal of Mechanical Engineering, 2019, 55(17): 29-34.

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数字图像相关法焊接热影响区应变原位测量及应力计算

Calculation and In-situ Measurement of HAZ Stress Based on Digital Image Correlation Method

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