• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (14): 90-97.doi: 10.3901/JME.2018.14.090

• 材料科学与工程 • 上一篇    下一篇

外部拘束条件下Q345钢单道堆焊接头面外变形机理的探讨

刘剑桥1, 李滋亮1, 任森栋1, 梁伟2, 邓德安1   

  1. 1. 重庆大学材料科学与工程学院 重庆 400044;
    2. 重庆交通大学机电与车辆工程学院 重庆 400074
  • 收稿日期:2017-07-31 修回日期:2017-12-19 出版日期:2018-07-20 发布日期:2018-07-20
  • 通讯作者: 邓德安(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要研究方向为焊接残余应力理论预测、焊接变形的数值模拟和焊接过程中热-冶金-力学耦合行为。E-mail:deandeng@cqu.edu.cn
  • 作者简介:刘剑桥,男,1992年出生。主要研究方向为焊接数值模拟和金属材料焊接。E-mail:13508399982@163.com
  • 基金资助:
    国家自然科学基金资助项目(51375518)。

Investigating the Mechanism of Out-of-Plane Deformation in Q345 Steel Single-pass Bead-on Welded Joint with External Restraint

LIU Jianqiao1, LI Ziliang1, REN Sendong1, LIANG Wei2, DENG Dean1   

  1. 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044;
    2. School of Mechanotronics & Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074
  • Received:2017-07-31 Revised:2017-12-19 Online:2018-07-20 Published:2018-07-20

摘要: 采用数值模拟和试验手段相结合的方法研究外部拘束对低合金高强钢Q345单道堆焊接头面外变形影响的机理。基于有限元软件ABAQUS平台,开发同时考虑材料非线性、几何非线性与接触非线性的热-弹-塑性有限元算法来模拟板厚为2 mm和4 mm的低合金高强钢薄板单道堆焊的温度场、残余应力和焊接变形。同时,采用试验方法测量了薄板接头的面外变形。通过比较试验结果和模拟结果,验证了所开发的有限元计算方法的有效性。分析自由状态和外加约束条件下接头的面外变形模式;比较中央截面平均压应力和其临界失稳应力的数值;研究不同拘束位置对纵向塑性应变和横向塑性应变分布的影响。结果表明,在薄板发生失稳变形时,外加拘束对面外变形的控制作用不明显;而在薄板未发生失稳变形时,外部拘束能够明显减小面外变形。

关键词: 非线性, 焊接变形, 失稳变形, 外部拘束

Abstract: The mechanism of out-of-plane deformation in Q345 steel thin-plate bead-on joint with external restraint was investigated by means of both numerical simulation and experiment. Based on the commercial software ABAQUS, a thermo-elastic-plastic finite element method with the consideration of material nonlinearity, geometrical nonlinearity, and boundary nonlinearity was developed to simulate the temperature field, residual stress field and welding deformation in low alloy high tensile strength steel thin-plate joints. Meanwhile, the experiments are carried out to measure the out-of-plane deformations in thin-plate welded joints. The effectiveness of the developed computational approach is verified based on the comparison between the simulated results and the corresponding experimental measurements. The average compressive stress of the middle cross-section and the critical buckling stress are examined. The influence of different external constraint positions on both longitudinal and transverse plastic strain distributions is investigated numerically. The simulated results show that the external restraint cannot reduce the out-of-plane deformation effectively when buckling distortion occurs in the thin-plate welded joint. Whereas, it can decrease the out-of-plane deformation to certain extent before buckling distortion appears.

Key words: buckling distortion, external restraint, nonlinearity, welding deformation

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