5052铝合金搅拌摩擦焊残余应力场数值模拟研究  

Numerical Simulation Study of Residual Stress Field of Friction Stir Welding of 5052 Aluminum Alloy

作　　者：苗臣怀 曹丽杰[1] 殷凯 王楠楠 MIAO Chenhuai;CAO Lijie;YIN Kai;WANG Nannan(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院

出　　处：《轻工机械》2020年第1期46-50,共5页Light Industry Machinery

基　　金：国家自然科学基金资助项目(41807235)

摘　　要：针对目前铝合金搅拌摩擦焊的焊后残余应力过大,且内部残余应力难以测量的现象,课题组提出了基于热弹塑性法和顺序热力耦合方式的搅拌摩擦焊应力模拟的热源模型、边界条件模型和有限元模型,采用正交设计的方法对影响残余应力3个主要因素进行数值模拟的设计,并对模拟结果进行试验验证。模拟与试验结果均表明合适的焊接参数(转速取1000 r·min^-1,焊速取120 mm·min^-1,预热时间取3 s)能有效减小5020铝合金搅拌摩擦焊的焊后残余应力,且数值模拟得到残余应力与实际焊后残余应力结果较为吻合。Aiming at the excessive residual stress and the difficulty to measure the residual stress of friction stir welding of aluminum alloy,the heat source model,boundary condition model and finite element model was proposed based on thermal elastic-plastic method and sequential thermal coupling stress simulation of friction stir welding.The orthogonal design method was adopted to simulate the three main factors that affect the residual stress in the design of the numerical simulation,and the simulation results were verified by experiments.The results show that suitable welding parameters(speed 1000 r·min^-1,welding speed take 120 mm·min^-1,preheating time take 3s)can effectively reduce the residual stress after welding of friction stir welding for 5020 aluminum alloy,and the numerical simulation results was coincident with the actual residual stress after welding results.

关 键 词：搅拌摩擦焊 应力场 正交设计 热弹塑性法 顺序热力耦合 

分 类 号：TH131.2[机械工程—机械制造及自动化] TG457[金属学及工艺—焊接]