大型船体舷侧分段装焊顺序仿真及其变形预测研究

Study on Subsection Welding Sequence Simulation and Deformation Prediction of Large Ship Sides

针对大型船体结构焊接仿真及变形预测困难等问题,综合运用热弹塑性有限元法和固有应变法实现船体舷侧分段装焊工艺仿真,重点研究不同装焊顺序对焊接变形的影响。系统分析了船体舷侧分段的焊缝类型及其焊接工艺:基于热弹塑性有限元法获取典型焊缝接头的固有应变;进而采用固有应变法分析了不同装焊顺序下舷侧分段的焊接变形及其分布规律.结果表明:舷侧分段呈现纵向两端向中间收缩变形趋势,最大变形量发生在内外板衔接处。反造法相对于正造法的装焊工艺,焊后变形在x、y方向的最大变形量分别提高0.8%、5%,在z方向的最大变形量降低4.4%为提高大型船体结构装焊效率和质量提供了理论支撑。

Aiming to solve the difficulties about large hull structure's welding simulation and deformation prediction,the thermal elastic-plastic finite element method and inherent strain method were combined and used to realize the welding process simulation of large ship side subsection.And the influence of different welding sequences on welding deformation was researched.The weld type of hull shipboard segment and welding process were analyzed systematically.The inherent strains of the typical weld joints were obtained based on the thermal elastic-plastic finite element method.Then,the welding deformation and its distribution rule of shipboard segment under different welding sequences were analyzed according to the inherent strain method.The simulation results reveal that the side subsection presents the contraction trend from the both longitudinal ends to the middle and the maximum deformation occurs in the connection of inner and outer plate.Compared with the normal method,the maximum deformations in the x,y directions by reverse method increase by 0.8%,5%, repectively.The maximum deformation in z direction reduces by 4.4%.The research provides theoretical support for improving the welding efficiency and quality of hull structure.