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A Fully Coupled Thermomechanical Model of Friction Stir Welding(FSW) and Numerical Studies on Process Parameters of Lightweight Aluminum Alloy Joints

查看全文 作　　者：Saad [1]B.Aziz;Mohammad [1]W.Dewan;Daniel [1]J.Huggett;Muhammad [1]A.Wahab;Ayman [2]M.Okeil;T.Warren [1]Liao 高影响力作者 机构地区：[1]Department of Mechanical and Industrial Engineering,Louisiana State University;[2]Department of Civil and Environmental Engineering,Louisiana State University高影响力机构 出　　处：《Acta Metallurgica Sinica(English Letters)》索引2018年第31卷第1期,共18页高影响力期刊 基　　金：financial support provided by Louisiana Economic Development Assistantship (EDA) program;partially supported by NASA through the NASA-SLS Grant # NNM13AA02G 摘　　要：This paper presents a new thermomechanical model of friction stir welding which is capable of simulating the three major steps of friction stir welding(FSW) process, i.e., plunge, dwell, and travel stages. A rate-dependent Johnson–Cook constitutive model is chosen to capture elasto-plastic work deformations during FSW. Two different weld schedules(i.e., plunge rate, rotational speed, and weld speed) are validated by comparing simulated temperature profiles with experimental results. Based on this model, the influences of various welding parameters on temperatures and energy generation during the welding process are investigated. Numerical results show that maximum temperature in FSW process increases with the decrease in plunge rate, and the frictional energy increases almost linearly with respect to time for different rotational speeds. Furthermore, low rotational speeds cause inadequate temperature distribution due to low frictional and plastic dissipation energy which eventually results in weld defects. When both the weld speed and rotational speed are increased, the contribution of plastic dissipation energy increases significantly and improved weld quality can be expected. 关 键 词：焊接速度 模型 磨擦 铝合金 旋转速度 进程 关节 焊接过程
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