6061-T6铝合金MIG焊接头微区拉伸性能表征及接头拉伸性能的有限元仿真
Tensile Properties Characterization of Micro-zone of 6061-T6 Aluminum Alloy MIG Welded Joint and Finite Element Simulation of Tensile Properties of Joint
摘 要
建立了6061-T6铝合金MIG焊接接头微区拉伸性能测试的高精度等效试验方法；采用有限元模拟了焊接过程的温度变化情况，建立了温度与接头各微区拉伸性能的关系；获得了可表征接头各微区材料性能的参数，验证了将接头等效为不同热状态材料所建立的精细模型对接头性能预测的可靠性。结果表明：微区温度场、焊缝熔池形貌和拉伸性能的仿真模拟与试验结果的吻合性较好；采用等效焊接接头的拉伸仿真模拟与试验的峰值力的误差仅为0.1%，断裂失效时的位移误差仅为5.7%，根据温度分布将热影响区网格划分为不同热状态材料可以有效预测焊接接头的拉伸性能。
温度分布
拉伸性能
有限元仿真
heat affected micro-zone
temperature distribution
tensile property
finite element simulation
Abstract
A high precision equivalent experimental method for measuring micro-zone tensile properties of 6061-T6 aluminum alloy MIG welded joint was established. The temperature changed during the welding process was simulated by finite element, and relationship between temperature and tensile properties of joint micro-zone was established. The parameters that could characterize properties of each micro-zone material of joint was obtained, and verified that joint was equivalent to materials in different thermal states to established the fine model for predicting the properties of joint was reliability. The results show that the simulation of the temperature field, weld pool morphology and tensile properties were in good agreement with the experimental results. The error of the peak force between simulation by eguivalent weld joint and experiment was only 0.1%, and the displacement error of fracture failure was only 5.7%. The heat affected zone grid was divided into different thermal state materials on the basis of temperature distribution could effectively predict tensile properties of weld joint.
中图分类号 TG406 DOI 10.11973/jxgccl202103015
所属栏目 物理模拟与数值模拟
基金项目 国家重点研发计划项目（2016YFB0101700）；国家自然科学基金资助项目（U1664252，51975201）
收稿日期 2020/1/19
修改稿日期 2020/11/10
网络出版日期
作者单位点击查看
备注王前进(1993-),男,河南商丘人,硕士研究生
引用该论文: WANG Qianjin,XU Congchang,LI Jia,XU Hong,HE Hong,LI Luoxing. Tensile Properties Characterization of Micro-zone of 6061-T6 Aluminum Alloy MIG Welded Joint and Finite Element Simulation of Tensile Properties of Joint[J]. Materials for mechancial engineering, 2021, 45(3): 76～82
王前进,徐从昌,李佳,许红,何洪,李落星. 6061-T6铝合金MIG焊接头微区拉伸性能表征及接头拉伸性能的有限元仿真[J]. 机械工程材料, 2021, 45(3): 76～82
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【4】赵波, 陈娜娜, 刘少权. 常用连接结构在简化有限元模型中的模拟方法[J]. 数学建模及其应用, 2016, 5(1):9-17. ZHAO B,CHEN N N,LIU S Q.Structural joining modeling methods in the simplified finite element models[J].Mathematical Modeling and Its Applications,2016,5(1):9-17.
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【7】王志成, 乔及森, 陈剑虹, 等. 轿车用铝合金焊接接头局部力学性能分析[J]. 焊接学报, 2009, 30(1):21-24. WANG Z C,QIAO J S,CHEN J H,et al.Investigation on the local mechanical properties of the automobile aluminium alloy welded joint[J].Transactions of the China Welding Institution,2009,30(1):21-24.
【8】石圩, 樊丁, 陈剑虹. 基于神经网络方法的焊接接头力学性能预测[J]. 焊接学报, 2004, 25(2):73-76. SHI X, FAN D,CHEN J H.Prediction of mechanical properties of welded joints based on neural network method[J].Transactions of the China Welding Institution,2004,25(2):73-76.
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【10】郑振太. 大型厚壁结构焊接过程的数值模拟研究与应用[D]. 天津:天津大学, 2007. ZHENG Z T.Numerical simulation research and application of welding process of large thick-walled structure[D].Tianjin:Tianjin University,2007.
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