铝合金搅拌摩擦焊接过程传热和塑性流动数值分析  

Numerical analysis of heat transfer and plastic flow during friction stir welding process of aluminum alloy

作　　者：董学伟[1] 黎向锋[1] 左敦稳[1] 王吉胜[1] 董春林 李光 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]中国搅拌摩擦焊接中心,北京100024

出　　处：《兵器材料科学与工程》2011年第5期44-48,共5页Ordnance Material Science and Engineering

基　　金：空装十一五预研项目

摘　　要：利用大型计算流体动力学软件FLUENT,建立铝合金板搅拌摩擦焊接过程热流耦合三维有限元模型。通过求解三维质量、动量和能量守恒方程,得到焊接过程粘塑性金属三维流场和温度场。结果表明,相比较搅拌头的进给速度,搅拌头转速对促进其周围塑性金属流动效果明显。同时与纯流场模型相比,热流耦合模型显示金属流动性较充分。此外,仿真得到的温度场得到了实验结果的验证。A coupled flow-thermal finite element model of friction stir welding process was built by using FLUENT, which is a computational fluid dynamics software. By solving equation of mass, momentum and energy conservation equation, three- dimensional flow field and temperature field of viscoplastic metal were obtained. Results show that compared with feed speed of stir tool, the effect of rotational speed on promoting plastic metal flow is more obvious. At the same time, compared with simple flow field model, the coupled flow-thermal model shows higher fluidity of plastic metal. Moreover, the simulated temperature field was verified by experimental data.

关 键 词：铝合金 搅拌摩擦焊 热流耦合 塑性流动 温度场 

分 类 号：TG402[金属学及工艺—焊接]