DP780双相钢电阻点焊接头动态载荷下失效行为研究

doi:10.3901/JME.2021.02.070

机械工程学报 ›› 2021, Vol. 57 ›› Issue (2): 70-79.doi: 10.3901/JME.2021.02.070

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DP780双相钢电阻点焊接头动态载荷下失效行为研究

崔俊佳, 董东营, 王琼, 李光耀

湖南大学汽车车身先进设计制造国家重点实验室长沙 410082

收稿日期:2020-04-01 修回日期:2020-08-13 出版日期:2021-01-20 发布日期:2021-03-15
通讯作者: 李光耀(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为新能源汽车制造、异种材料高效连接技术、汽车轻量化。E-mail:gyli@hnu.edu.cn
作者简介:崔俊佳,男,1983年出生,博士,教授,博士研究生导师。主要研究方向为汽车轻量化、异种材料高效连接技术。E-mail:cuijunjia@hnu.edu.cn
基金资助:
国家自然科学基金（51975202）和湖南省优秀青年基金（2019JJ30005）资助项目。

Failure Behavior Analysis of Resistance Spot Welding Joints of DP780 Dual-phase Steel under Dynamic Load

CUI Junjia, DONG Dongying, WANG Qiong, LI Guangyao

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082

Received:2020-04-01 Revised:2020-08-13 Online:2021-01-20 Published:2021-03-15

摘要/Abstract

摘要： 采用DP780双相钢电阻点焊接头，针对不同拉伸速度下接头的失效行为进行了研究。利用数字图像相关（Digital image correlation，DIC）技术分析接头的全场应变，同时对不同失效模式下的接头微观断口形貌进行分析。结果表明，准静态与动态拉伸下接头的失效模式主要有界面断裂与熔核拔出两种。随着拉伸速度的增加，接头的失效位置由界面断裂向母材撕裂变化，同时接头失效的峰值载荷与吸能值逐渐增大。2 mm/min测试速度下的峰值载荷为21.08 kN，相比2 mm/min，2 m/s、6 m/s、10 m/s的峰值载荷分别提升了26.57%、46.92%、63.99%。四种测试速度下的失效吸能值分别为10.16 J、31.37 J、52.83 J和63.77 J。由于拉伸时搭接接头焊点会发生偏转，造成了焊点上方拉伸作用为主，下方压缩作用为主。焊点不同程度的偏转，将使接头发生不同的失效模式。随着拉伸速度的提升，接头断口韧窝的摩擦分层越发剧烈。

关键词: 电阻点焊, 双相钢, 动态拉伸, 数字图像相关, 失效行为

Abstract: The resistance spot welding joints of DP780 dual-phase steel are used to study the failure behavior under different tensile speeds. The digital image correlation (Digital image correlation, DIC) technique is used to analyze the full-field strain of the joints. At the same time, the micro fracture morphology of the joints under different failure modes is analyzed. Results show that the failure modes of the joints are interface fracture and nugget pull-out under quasi-static and dynamic stretching. With the increase of tensile speed, the failure position of the joints changes from interface fracture to base metal tear. The peak load and energy absorption values of joint failure increase gradually. The peak load of 2 mm/min is 21.08 kN. Compared with 2 mm/min, the peak load of 2 m/s, 6 m/s and 10 m/s is increased by 26.57%, 46.92% and 63.99%, respectively. The energy absorption values at these four test speeds are 10.16 J, 31.37 J, 52.83 J, and 63.77 J, respectively. Due to the nugget deflection of the lap joints during stretching, the tensile action above the solder joint is dominant and the compression action is dominant below. Different degrees of the nugget deflection will cause different failure modes of the joints. The friction stratification of the joint fracture dimples becomes more and more severe with the increase of tensile speed.

Key words: resistance spot welding, dual-phase steel, dynamic stretching, digital image correlation, failure behavior

中图分类号:

TG443

崔俊佳, 董东营, 王琼, 李光耀. DP780双相钢电阻点焊接头动态载荷下失效行为研究[J]. 机械工程学报, 2021, 57(2): 70-79.

CUI Junjia, DONG Dongying, WANG Qiong, LI Guangyao. Failure Behavior Analysis of Resistance Spot Welding Joints of DP780 Dual-phase Steel under Dynamic Load[J]. Journal of Mechanical Engineering, 2021, 57(2): 70-79.

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DP780双相钢电阻点焊接头动态载荷下失效行为研究

Failure Behavior Analysis of Resistance Spot Welding Joints of DP780 Dual-phase Steel under Dynamic Load

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