基于DIC方法的铝合金焊接接头拉伸性能研究
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摘要
为准确表征铝合金焊接接头拉伸性能,针对2219铝合金搅拌摩擦焊焊接接头,采用数字图像相关(DIC)方法,测量焊接接头在拉伸载荷作用下的全场应变历程,得到铝合金焊接接头焊接区在拉伸时的连续屈服强度曲线。进而结合材料弹塑性本构模型,拟合焊接区内各点处材料本构关系,并分别构造了铝合金焊接接头焊缝区及热影响区力学性能连续变化的拟合函数,使之可以表达铝合金焊接接头焊接区内任意一点力学性能。最后利用所构造的力学性能函数模拟了铝合金焊接接头的拉伸过程,数值结果与试验相吻合,表明基于数字图像相关法的应变测量可以准确地表征其焊接区内的材料力学性能。
In order to obtain the properties of 2219 aluminum alloy welding joint, this work uses digital image correlation(DIC) method, then the whole strain history within the welding zone of 2219 aluminum alloy friction stir welded joint subjected to tensile load is obtained, which in turn facilitates a continuous yield strength curve for the welding zone. The elastic-plastic constitutive equation is employed to describe mechanical properties of the welding zone with its parameters determined by the measured strain history. Then, the relationship between the distances from any location to the weld zone center and parameters in the equation can be established by fitting. Finally, a numerical simulation of welding joint subjected to tensile load is conducted using the mechanical properties given by the obtained relationship. The simulation results agree well with the experimental data. Therefore, it is proposed that the mechanical properties of the welding zone in a welding joint can be accurately obtained by analyzing its stress-strain curves measured by DIC method.
In order to obtain the properties of 2219 aluminum alloy welding joint, this work uses digital image correlation(DIC) method, then the whole strain history within the welding zone of 2219 aluminum alloy friction stir welded joint subjected to tensile load is obtained, which in turn facilitates a continuous yield strength curve for the welding zone. The elastic-plastic constitutive equation is employed to describe mechanical properties of the welding zone with its parameters determined by the measured strain history. Then, the relationship between the distances from any location to the weld zone center and parameters in the equation can be established by fitting. Finally, a numerical simulation of welding joint subjected to tensile load is conducted using the mechanical properties given by the obtained relationship. The simulation results agree well with the experimental data. Therefore, it is proposed that the mechanical properties of the welding zone in a welding joint can be accurately obtained by analyzing its stress-strain curves measured by DIC method.
引文
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[10]Rief T,Hausmann J,Motsch N.Development of a New Method for Residual Stress Analysis on Fiber Reinforced Plastics with Use of Digital Image Correlation[J].Key Engineering Materials,2017(742):660-665.
[11]Hector L G,Chen Y L,Agarwal S,et al.Friction stir processed AA5182-O and AA6111-T4 aluminum alloy.Part 2:Tensile properties and strain field evolution[J].Journal of Materials Engineering and Performance,2007,16(4):404-417.
[12]Lemmen H J K,Alderliseten R C,Pieters R R G M,et al.Yield strength and residual stress measurements on friction-stir-welded aluminum alloys[J].Journal of Aircraft,2010,47(5):1570-1583.
[13]Khaled J.Fadhalah.Microstructure and mechanical properties of multi-pass friction stir processed aluminum alloy 6063[J].Materials and Design,2014(53):550-560.
[14]GB/T 228.1-2010,金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010:1-25GB/T 228.1-2010,Metallic materials-Tensile testing-Part 1:Method of test at room temperature[S].Beijing:China Standards Press,2010:1-25(In Chinese)
[2]朱春沅,李桓,黄超群,等.2219铝合金焊接残余应力分布分析[J].焊接学报,2017,38(11):32-36.ZHU ChunYuan,LI Huan,HUANG ChaoQun,et al.Study on residual stress distribution of 2219 aluminum alloy[J].Transactions of the China Welding Institution,2017,38(11):32-36(In Chinese).
[3]LV Zongliang,LI Chong,WAN Long,et al.The influence of gradient mismatches on mechanical properties and microstructure of2219-T6 aluminum alloy VP-TIG joints[J].China Welding,2017,26(4):20-28.
[4]HAN Wenfeng,YU Min,FANG Xifeng,et al.Effect of flame heating pass on microstructure and properties of A6N01 aluminum alloy welded joint[J].China Welding,2017,26(1):21-28.
[5]Rao D,Huber K,Heerens A,et al.Asymmetric mechanical properties and tensile behaviour prediction of aluminium alloy 5083friction stir welding joints[J].Materials Science&Engineering A,2013(565):44-50.
[6]Ambriz R R,Chicot D,Benseddiq N,et al.Local mechanical properties of the 6061-T6 aluminum weld using micro-traction and instrumented indentation[J].European Journal of Mechanics,2011,30(3):307-315.
[7]Rojek J,Hyrcza-Michalska M,Bokota A,et al.Determination of mechanical properties of the weld zone in tailor-welded blanks[J].Archives of Civil and Mechanical Engineering,2012,12(2):156-162.
[8]Yazdipour A,Heidarzadeh A.Effect of friction stir welding on microstructure and mechanical properties of dissimilar Al 5083-H321 and 316L stainless steel alloy joints[J].Journal of Alloys and Compounds,2016(680):595-603.
[9]Bartlett J L,Croom B P,Burdick J,et al.Revealing mechanisms of residual stress development in additive manufacturing via digital image correlation[J].Additive Manufacturing,2018,22(8):1-12.
[10]Rief T,Hausmann J,Motsch N.Development of a New Method for Residual Stress Analysis on Fiber Reinforced Plastics with Use of Digital Image Correlation[J].Key Engineering Materials,2017(742):660-665.
[11]Hector L G,Chen Y L,Agarwal S,et al.Friction stir processed AA5182-O and AA6111-T4 aluminum alloy.Part 2:Tensile properties and strain field evolution[J].Journal of Materials Engineering and Performance,2007,16(4):404-417.
[12]Lemmen H J K,Alderliseten R C,Pieters R R G M,et al.Yield strength and residual stress measurements on friction-stir-welded aluminum alloys[J].Journal of Aircraft,2010,47(5):1570-1583.
[13]Khaled J.Fadhalah.Microstructure and mechanical properties of multi-pass friction stir processed aluminum alloy 6063[J].Materials and Design,2014(53):550-560.
[14]GB/T 228.1-2010,金属材料拉伸试验第1部分:室温试验方法[S].北京:中国标准出版社,2010:1-25GB/T 228.1-2010,Metallic materials-Tensile testing-Part 1:Method of test at room temperature[S].Beijing:China Standards Press,2010:1-25(In Chinese)