双离合器内片支架焊接残余应力场有限元分析
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摘要
针对激光焊接残余应力导致的焊接件结构失效问题,以目标DCT双离合变速器内片支架与花键轴为研究对象,借助于Sysweld有限元软件建立了三维有限元数值计算模型并对焊接过程进行了数值模拟,得到了焊接过程瞬态温度场和特征点的热循环曲线,模拟得到的焊缝形貌特征与实际焊缝形貌基本吻合。在此基础上得到了焊缝内部金相组织演变和残余应力分布状况。结果表明:冷却后的焊缝区域显微组织主要为马氏体,焊接接头具有较好的强度和韧性;切向残余应力在距焊缝中心约2 mm处达到拉应力峰值,此处是焊缝最容易出现裂纹的薄弱部位。
In view of the structural failure caused by laser welding residual stress, with the target DCT dual clutch transmission inner plate carrier and the spline as the study object,a three-dimensional finite element numerical model was established by SYSWELD finite element software and the numerical simulation of the welding process was carried out. The thermal cycle curves of the transient temperature field and characteristic points were obtained, the characteristics of the weld seams were basically in line with the actual welding seams. On this basis, the evolution of the metallurgical structure and the distribution of the residual stress in the weld were obtained.The results show that the microstructure of the weld area after cooling is mainly martensite, and the welded joint has good strength and toughness. The tangential residual stress reaches the peak value of tensile stress at about 2 mm from the center of the weld. This is where the weld is most vulnerable to the crack.
In view of the structural failure caused by laser welding residual stress, with the target DCT dual clutch transmission inner plate carrier and the spline as the study object,a three-dimensional finite element numerical model was established by SYSWELD finite element software and the numerical simulation of the welding process was carried out. The thermal cycle curves of the transient temperature field and characteristic points were obtained, the characteristics of the weld seams were basically in line with the actual welding seams. On this basis, the evolution of the metallurgical structure and the distribution of the residual stress in the weld were obtained.The results show that the microstructure of the weld area after cooling is mainly martensite, and the welded joint has good strength and toughness. The tangential residual stress reaches the peak value of tensile stress at about 2 mm from the center of the weld. This is where the weld is most vulnerable to the crack.
引文
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[2] 方洪渊.焊接结构学[M].北京:机械工业出版社,2008:23-25.FANG HongYuan.Mechanics of welding structure[M].Beijing:Machinery Industry Press,2008:23-25(In Chinese)
[3] 候海量,朱锡,刘润泉.盲孔法测量焊接残余应力应变释放系数的有限元分析[J].机械强度,2003,25(6):632-636.HOU HaiLiang,ZHU Xi,LIU RuiQuan.Finite element analysis of welding residual stress and strain release coefficient by blind hole method [J].Journal of Mechanical Strength,2003,25(6):632-636(In Chinese)
[4] 倪红芳,凌祥,涂善东.多道焊三维残余应力场有限元模拟[J].机械强度,2004,26(2):218-222.NI HongFang,LING Xiang,TU Dong.Finite element simulation of Three-dimensional residual stress field of multi pass welding [J].Journal of Mechanical Strength,2004,26(2):218-222(In Chinese)
[5] 李智钟,周建平,许燕,等.基于SYSWELD的T形管焊接件温度及应力应变场数值模拟分析[J].焊接学报,2016,37(4):77-80.LI ZhiZhong,ZHOU JianPing,XU Yan,et al.Numerical simulation analysis of temperature and stress-strain field of T tube weldment based on SYSWELD [J].Journal of Welding,2016,37(4):77-80(In Chinese)
[6] 孙雪英,卢岳川,臧峰刚.焊接残余应力有限元分析技术研究[J].原子能科学技术,2008,42(1):593-596.SUN XueYing,LU YueChuan,ZANG FengGang.Analysis technology for weld residual stress[J].Atomic Energy Science and Technology,2008,42(1):593-596(In Chinese)
[7] Khurram A,Shehzad K.FE simulation of welding distortion and residual stress in butt joint using inherentstrain[J].International Journal of Applied Physics and Mathematics,2012(2),405-408.
[8] 俞翔栋,董达善,黄婉娟.基于SYSWELD的Q690高强钢焊接数值模拟[J].热加工工艺,2014,43(19):202-203YU XiangDong,DONG DaShan,HUANG WanJuan.Numerical simulation of welding of Q690 high strength steel based on SYSWELD [J].Hot Working Process,2014,43(19):202-203(In Chinese)
[9] 黄道业.TC21钛合金激光深熔焊应力场数值模拟研究[J].长江大学学报,2013,34(10):74-77.HUANG DaoYe.Numerical simulation of stress field in laser welding of ecliptic.TC21 titanium alloy [J].Journal of Yangtze University,2013,10(34):74-77(In Chinese).
[10] 武传松.焊接热过程数值分析[M].哈尔滨:哈尔滨工业大学出版社,1990:245-246.WU ChuanSong.Numerical analysis of welding thermal process [M].Harbin:Harbin Institute of Technology Press,1990:245-246(In Chinese)
[11] 潘广善,王自力,李良碧,等.高强钢焊接结构残余热应力的有限元分析[J].船舶工程,2011(3):79-83.PAN GuangShan,WANG ZiLi,LI LiangBi,et al.Finite element analysis of residual thermal stress in welded structures of high strength steel [J].Ship Engineering,2011(3):79-83(In Chinese)