铝合金搅拌摩擦焊温度场及残余应力场研究  

Temperature field and residual stress field of friction stir welding of aluminum alloy

作　　者：周文静 许振波 杜柏松[1] ZHOU Wenjing;XU Zhenbo;DU Baisong(School of Architecture and Construction,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《兵器材料科学与工程》2020年第3期74-79,共6页Ordnance Material Science and Engineering

基　　金：重庆交通大学研究生创新项目(2018S0122)。

摘　　要：建立8 mm厚铝合金板有限元模型模拟搅拌摩擦焊稳态和动态过程,得到温度场和残余应力场的分布,将稳态及瞬态残余应力与实测值进行比较,分析了下压力和主轴转速改变对温度场和残余应力场影响,为实际工艺提供合理的取值范围。结果表明:应力温度非对称分布随转速、下压力增大而增强;稳态计算结果与瞬态计算结果在焊缝区、热机影响区、热影响区分布趋势一致,数值相差较小,可用稳态计算代替瞬态计算;上、下表面残余应力分布形式相似、个别数值略有差异,残余应力以纵向应力为主,轴肩处拉应力最大为90 MPa,远离焊缝的母材区压应力最大为40 MPa。The finite element model of 8 mm thick aluminum alloy plate was established to simulate the friction stir welding of steady state and dynamic process,the distribution of temperature field and residual stress field was obtained,and the steady state and transient residual stress were compared with the measured values. The influence of the stress and spindle speed change on the temperature field and residual stress field was analyzed to provide reasonable value range of practical process. The results show that the asymmetric distribution of stress and temperature increases with the increase of rotational speed and downforce.The steady-state calculation results are consistent with the transient calculation results in the weld area,the thermodynamic affected area and the heat affected area. The distribution of residual stress on the upper and lower surfaces is similar,and some values are slightly different. The residual stress is mainly longitudinal stress with the maximum tensile stress at the axial shoulder being 90 MPa and the maximum compressive stress in the base material away from the weld being 40 MPa.

关 键 词：搅拌摩擦焊 温度场 残余应力场 参数分析 

分 类 号：TG457.14[金属学及工艺—焊接]