双离合器内片支架焊接残余应力场有限元分析  

FINITE ELEMENT ANALYSIS OF WELDING RESIDUAL STRESS FIELD OF DUAL CLUTCH TRANSMISSION INNER PLATE CARRIER

作　　者：刘纯真 褚超美[1] 顾健华 LIU ChunZhen;CHU ChaoMei;GU JianHua(College of mechanical engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Product Research & Development Center,Shanghai Automobile Transmission Co.,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093 [2]上海汽车变速器有限公司技术中心,上海200093

出　　处：《机械强度》2019年第3期702-706,共5页Journal of Mechanical Strength

基　　金：上海汽车工业科技发展基金会(1747)资助~~

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.

关 键 词：DCT双离合变速器 离合器内片支架 激光焊接过程仿真 温度场 切向残余应力 

分 类 号：TG457.2[金属学及工艺—焊接]