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大型船舶构件尺寸大、焊缝分布广,传统的有限元焊接仿真方法难以满足其大尺寸结构计算的要求。基于热弹塑性有限元法对T型局部接头进行焊接变形计算,获取焊缝处平均固有应变值,然后将其作为初始载荷施加在全尺寸壳单元分段模型上进行弹性计算,最终得到大型分段的整体焊接变形。仿真结果表明,结合小模型的热弹塑性法和大结构固有应变法,能准确高效的预测大型结构的焊接变形。
The size of large-scale ship components, weld widely distributed, the traditional finite element method of welding simulation is difficult to meet the requirements of its large-size structural calculations. Based on the thermo-elasto-plastic finite element method (FEM), the T-shape local joints are calculated and the mean value of inherent strain is obtained. Then the initial strain is applied to the full-scale shell element model to calculate the elastic deformation. Finally, Section of the overall welding deformation. The simulation results show that the welding deformation of large structures can be accurately and efficiently predicted by combining the thermal elasto-plastic method of small model and the inherent strain method of large structure.