摘要
针对铝合金盒体焊接力学性能研究的欠缺,通过模拟铝盒焊接成型过程研究铝盒焊接后残余应力及变形的变化规律.建立三维有限元模型模拟铝盒在焊接过程中的应力场,采用双椭球热源模型模拟焊接过程中的温度场.通过双椭球热源模型电流的变化模拟焊接过程中焊接电流对铝盒焊接的影响.仿真实验采用6种铝盒尺寸模型模拟铝盒尺寸形状的多样性.仿真实验结果表明:铝盒焊接残余应力集中在开口处角点上,变形在焊缝后半位置处,铝盒沿4条侧边依次焊接后,第2条焊缝对应的铝盒顶点等效塑性应变最大且随电流的增大而增大,第4条焊缝对应的铝盒顶点最大主应力最大而受电流影响较小,铝盒总体尺寸变化随电流的增大而增大,实验铝盒厚0.8,mm时,最大变形量近5,mm.
To fill the lack of research on mechanical properties of aluminum alloy box welding,the change rule of residual stress and deformation of aluminum alloy box after welding was investigated by simulating the welding process of aluminum alloy box.A three-dimensional finite element model was developed to simulate the stress fields of the aluminum alloy box and a double-ellipsoidal volumetric model was developed to simulate the temperature fields of the aluminum alloy box during the welding process.The effect of welding current on the aluminum alloy box welding was simulated by changing the current of double-ellipsoidal volumetric model.In the simulation experiment,six kinds of aluminum alloy box size models were used to simulate the diversity of the size of aluminum alloy box.The simulation experiment results show that aluminum alloy box welding residual stress concentrates in the opening corner and deformation centers around the second half of the weld.The equivalent plastic strain of the aluminum alloy box vertex corresponding to the second weld is the largest and increases with the increase of current,while the maximum principal stress of the aluminum alloy box vertex corresponding to the fourth weld is the largest and is less affected by current after aluminum alloy box is welded along four sides in turn.Aluminum alloy box overall dimensions increase with the increasing of current,and the maximum deformation value is close to 5,mm when the aluminum alloy box thickness is 0.8,mm.
作者
赵连玉
卢燕超
刘振忠
张伯荣
曹元
李俊伟
Zhao Lianyu;Lu Yanchao;Liu Zhenzhong;Zhang Borong;Cao Yuan;Li Junwei(Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System,Tianjin 300384,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2018年第5期483-490,共8页
Journal of Tianjin University：Science and Technology
基金
天津市科技计划项目(16ZXZNGX00090)~~
关键词
铝合金
焊接电流
应力场
温度场
aluminum alloy
welding current
stress fields
temperature fields
