基于数字图像相关法的A7N01-T4铝合金焊接接头循环变形行为实验研究
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摘要
为研究A7N01铝合金MIG焊焊接接头单轴拉伸性能和循环变形特征,采用数字图像相关方法(DIC)分析A7N01铝合金焊接接头在单调拉伸和循环加载下的应变场分布,结合焊接接头显微硬度获取焊接接头整体、焊缝、热影响区和母材的平均应力-应变曲线。实验结果表明:焊接接头母材在单调拉伸和循环变形中一直处于弹性变形,焊接接头整体的塑性变形由焊缝和热影响区主导,体现出循环稳定特征和棘轮安定状态,焊接接头的棘轮应变值依赖于当前的应力水平和加载历史。
To investigate the uniaxial tension and cyclic deformation characteristics of A7 N01-T4 aluminum alloy welded joint by the method of metal inert gas( MIG) welding,the digital image correlation( DIC) method was used to indicate strain distribution under monotonic tension and cyclic loading,and the averaged stress-strain curves strain of welded joint,weld zone,heat-affected zone and base metal were obtained by combining the observations of micro-hardness. The experimental results show that the plastic deformation of the welded joint under monotonic tension and cyclic loading is mainly dominated by the weld zone and the heat-affected zone since the base metal in welded joint has always been in the state of elastic deformation,and A7 N01-T4 aluminum alloy welded joint exhibits cyclic stable feature and ratchetting shakedown state,and the ratcheting strain of the welded joint depends on the current stress level and the loading history.
To investigate the uniaxial tension and cyclic deformation characteristics of A7 N01-T4 aluminum alloy welded joint by the method of metal inert gas( MIG) welding,the digital image correlation( DIC) method was used to indicate strain distribution under monotonic tension and cyclic loading,and the averaged stress-strain curves strain of welded joint,weld zone,heat-affected zone and base metal were obtained by combining the observations of micro-hardness. The experimental results show that the plastic deformation of the welded joint under monotonic tension and cyclic loading is mainly dominated by the weld zone and the heat-affected zone since the base metal in welded joint has always been in the state of elastic deformation,and A7 N01-T4 aluminum alloy welded joint exhibits cyclic stable feature and ratchetting shakedown state,and the ratcheting strain of the welded joint depends on the current stress level and the loading history.
引文
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[22]李钊,刘宇杰,康国政.退火和调质42CrMo合金钢单轴循环塑性行为的实验研究[J].固体力学学报,2007,28(1):77-82.
[23]KANG G Z,LIU Y J,DING J.Multiaxial ratchetting-fatigue interaction of 42CrMo steels:experimental observations[J].International Journal of Fatigue,2008,30(12):2104-2118.
[2]LEE C H,DO V N V,CHANG K H.Analysis of uniaxial ratcheting behavior and cyclic mean stress relaxation of a duplex stainless steel[J].International Journal of Plasticity,2014,62(7):17-33.
[3]LIN Y C,CHEN X M,CHEN G.Uniaxial ratcheting and low-cycle fatigue failure behaviors of AZ91D magnesium alloy under cyclic tension deformation[J].Journal of Alloys&Compounds,2011,509(24):6838-6843.
[4]彭金波.铝合金的棘轮及低周疲劳行为研究[D].成都:西南交通大学,2014.
[5]KANG G,GAO Q,YANG X.Uniaxial and non-proportionally multiaxial ratcheting of SS304 stainless steel at room temperature:experiments and simulations[J].International Journal of Non-Linear Mechanics,2004,39(5):843-857.
[6]PAUL S K,SIVAPRASAD S,DHAR S,et al.True stresscontrolled ratcheting behavior of 304LN stainless steel[J].Journal of Materials Science,2012,47(11):4660-4672.
[7]杜俊杰.16MnR及其焊接接头棘轮效应与疲劳性能研究[D].天津:天津大学,2007.
[8]张尚林,郭素娟,朱明亮,等.25 Cr2Ni2Mo V钢焊接接头循环变形行为的有限元模拟与分析[J].压力容器,2014(5):13-22.
[9]王志海,陈亮,张立民,等.车体结构铝合金焊接接头疲劳性能研究[J].电机焊,2013,43(8):12-16.
[10]KIM S J,CHOI P H,DEWA R T,et al.Low cycle fatigue properties of alloy 617 base metal and weld joint at room temperature[J].Procedia Materials Science,2014(3):2201-2206.
[11]张亮.A7N01铝合金焊接接头的不均匀特性[J].焊接学报,2012,33(11):97-100.
[12]韩晓辉.高速列车铝合金车体焊接缺陷分析及工艺研究[J].焊接技术,2009,38(2):31-34.
[13]马传平,陈辉.A7N01铝合金焊接接头中不同区域在不同介质中的电化学腐蚀行[J].材料保护,2014,47(6):72-73.
[14]FENG A H,CHEN D L,MA Z Y.Microstructure and cyclic deformation behavior of friction stir-welded 707 Al alloy[J].Metallurgical&Materials Transactions A,2010,41(4):957-971.
[15]张顺庆,高晨家,张龙.数字图像相关技术在应力应变测量中的发展与最新应用[J].影像科学与光化学,2017,35(2):193-198.
[16]孙向伟,殷咸青,王江超,等.采用三维光学测量技术对薄板焊接失稳变形的分析[J].焊接学报,2013,34(6):109-112.
[17]NAKATA T,TANIGAWA H.Evaluation of localdeformation behavior accompanying fatigue damage in F82H welded joint specimens by using digital image correlation[J].Fusion Engineering&Design,2012,87(5-6):589-593.
[18]LUO H L,KANG G Z,KAN Q H,et al.Experimental investigation on the heterogeneous ratcheting of SUS301L stainless steel butt weld joint during uniaxial cyclic loading[J].International Journal of Fatigue,2017,105:169-179.
[19]SARANATH K M,SHARMA A,RAMJI M.Zone wise local characterization of welds using digital image correlation Technique[J].Optics&Lasers in Engineering,2014,63(4):30-42.
[20]康国政,高庆.循环稳定材料的棘轮行为:I.实验和本构模型[J].工程力学,2005,22(2):206-211.
[21]丁俊,康国政,刘宇杰.LY12CZ铝合金材料的室温和高温单轴循环变形行为及其时间相关性[J].航空学报,2008,29(1):70-74.
[22]李钊,刘宇杰,康国政.退火和调质42CrMo合金钢单轴循环塑性行为的实验研究[J].固体力学学报,2007,28(1):77-82.
[23]KANG G Z,LIU Y J,DING J.Multiaxial ratchetting-fatigue interaction of 42CrMo steels:experimental observations[J].International Journal of Fatigue,2008,30(12):2104-2118.