热循环下铝/钢连续驱动摩擦焊接接头应力应变分析  

Stress and Strain Analysis of Aluminum/Steel Continuous Drive Friction Welding Joints Under Thermal Cycling

作　　者：张昌青[1,2] 王烨 史煜 马东东 谷怀壮 ZHANG Changqing;WANG Ye;SHI Yu;MA Dongdong;GU Huaizhuang(State Key Laboratory of Advanced Processing and Recycling of Nor-ferrous Metal,Lanzhou University of Technology,Lanzhou 730050,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《电焊机》2024年第2期24-29,共6页Electric Welding Machine

基　　金：国家自然科学基金(51961025)。

摘　　要：利用ABAQUS有限元软件,建立了一个新的连续驱动摩擦焊接头热-力耦合过程的数值模型,分析了试验过程接头温度场、应力应变分布规律,通过与实际试验结果的对比,验证模型的准确性。得出如下结论:热循环过程中,冷却及低温保温过程是热应力最大的阶段;接头颈缩形貌和产生位置与试验结果吻合较好,颈缩位置与实际试验相对误差为6%,颈缩现象的本质是铝在自由膨胀收缩时应力超过强度极限产生的塑性变形。在拉伸断口观察到解理断裂圆环,其位置、宽度与模拟结果的应变集中区域吻合度高。该模型较准确的模拟了连续驱动摩擦焊接头的热-力耦合过程,为实际生产和工艺优化提供了有力支持。Using ABAQUS finite element software,a new numerical model of thermal mechanical coupling process of continuously driven friction welded joints was established.The following conclusion is drawn:the cooling and low-temperature insulation processes during the thermal cycle are the stages with the highest thermal stress;The appearance and location of joint necking are in good agreement with the experimental results,and the relative error between the necking location and the actual experiment is 6%.The essence of the necking phenomenon is the plastic deformation caused by the stress exceeding the strength limit when the aluminum is Free expansion and shrinkage;The cleavage fracture ring was observed on the tensile fracture surface,and its position and width are highly consistent with the strain concentration area of the simulation results.The numerical model accurately simulates the thermo-force coupling process of continuously driven friction welded joints,which provides strong support for actual production and process optimaztion.

关 键 词：连续驱动摩擦焊接 热循环 热应力 有限元模拟 应力应变场 

分 类 号：TG457.1[金属学及工艺—焊接]