船体焊接残余应力的数值分析

船体在焊接过程中产生的焊接残余应力不仅会降低船体结构的性能,还会使得建造精度难以控制,从而最终影响到船舶建造质量.本文以热弹塑性理论为基础,利用ANSYS非线性分析有限元程序,对船体结构焊缝进行了数值分析,获得了焊接顺序、构件尺寸对残余应力分布的影响规律.分析结果显示,分段焊接可以有效降低残余应力的峰值,尤其是对控制横向残余应力更为明显,焊缝方向上的残余应力会造成较大的残余变形.本文研究结果为优化生产工艺,控制残余应力提供了理论依据.

Numerical analysis of hull welding residual stress

The welding residual stress produced during the hull welding assembly process will not only reduce the performance of the hull structure,but also make the construction of precision difficult to control,thus ultimately affecting the quality of ship construction.This paper,in the basis of thermal-elastic-plastic theory,analyses finite element method using ANSYS nonlinear,and analyses numerically the weld the hull in structure,obtaining the law haw welding sequence and scantlings effect residual stress distrib...