【摘要】 基于通用有限元软件MSC. Marc开发了考虑材料非线性、几何非线性和边界非线性的热-弹-塑性有限元计算方法来模拟薄板长直结构的焊接变形。采用所开发的数值模拟方法，计算了含有两条焊缝的薄板长直焊接结构在激光-电弧复合焊接条件下的焊接变形，并研究了焊接顺序、焊接热输入和两条焊缝的热输入比对焊接变形的影响。数值模拟结果表明：在本研究所采用的拘束条件下，焊接顺序对焊接变形有显著影响；对于非对称焊接结构，先焊局部刚度较大焊缝产生的焊接变形相对要小些；在两条焊缝热输入相同的情况下，焊接结构的变形大小与焊接热输入大小呈现正相关关系；两条焊缝的热输入比对于非对称结构的焊接变形也有较大的影响。更多还原

【Abstract】 Based on software MSC. Marc, a thermos-elastic-plastic finite element method with consideration of material nonlinearity, geometric nonlinearity and boundary nonlinearity was developed to simulate welding deformation of long thin-plate structure. The welding deformation of a long thin-plate welded structure with two welds induced by laser-arc hybrid welding process was simulated by the developed numerical simulation method. Meanwhile, the influences of welding sequence, heat input and heat input ratio for two welds on the final welding distortion were studied numerically. The simulation results show that welding sequence has a significant effect on the welding deformation under the constraint conditions adopted in the current study. For the asymmetric welded structure, the welding deformation was relatively smaller when the weld with relatively strong restraint was performed firstly. When the heat input of two welds is identical, the welding deformation of the welded structure is positively correlated with the heat input. The heat input ratio for two welds also has significant influence on the welding deformation of the long thin-plate welded structure.更多还原