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针对大型飞机高强铝合金壁板激光焊接T型接头结构的角变形缺陷,提出了一种在蒙皮背部添加辅助热源的方法,有效地控制了角变形的产生。并基于有限元软件ABAQUS,开发了一种适用于这种焊接方法的焊接模型,同时考虑材料非线性、几何非线性和移动热源的热-弹-塑性有限元计算方法来模拟焊接过程中的热-力学耦合行为,分析焊接过程中的温度场、残余应力和焊接变形。同时,采用实验方法测量了加入辅助热源前后焊接接头的变形。结果表明,数值计算所得到的挠曲变形、角变形与实验测量结果十分吻合,验证了所开发的有限元计算方法的有效性。
Aiming at the angle deformation defect of laser welded T-joint structure of high-strength aluminum alloy siding for large aircraft, a method of adding auxiliary heat source on the back of the skin is proposed to effectively control the deformation of the corner. Based on the finite element software ABAQUS, a welding model suitable for this kind of welding method was developed. The heat-elastic-plastic finite element method of material nonlinearity, geometrical nonlinearity and moving heat source were also considered to simulate the welding heat - Mechanics Coupling Behavior, Analysis of Temperature Field, Residual Stress and Welding Deformation in Welding Process. At the same time, the deformation of welded joint before and after adding auxiliary heat source was measured by experiment. The results show that the numerical results of flexural deformation and angular deformation are in good agreement with the experimental results, which verify the effectiveness of the finite element method developed.