SS304半管夹套焊接部位残余应力三维有限元模拟

半圆管夹套设备最常见的问题是夹套焊接部位开裂引起泄漏,焊接残余应力是重要的影响因素之一.利用有限元软件ABAQUS,开发了一个多次顺次耦合焊接残余应力有限元计算程序,并利用FORTRAN语言编写移动高斯热源的分布子程序,对304不锈钢半管夹套焊接部位残余应力进行数值模拟,得到半管夹套T形接头焊接残余应力分布规律.计算结果表明,在T形接头附近,应力水平较高,易诱使焊缝开裂失效.并对半管夹套的焊接制造提出建议,为优化半管夹套焊接工艺、控制焊接残余应力提供理论依据,对提高半管夹套设备的可靠性和安全性具有重要意义.

3-D finite element analysis of welding residual stress for halfpipe jacket made of 304 stainless steel

The problem of half-pipe jacket equipment is the leakage induced by cracks in half-pipe welding position. Welding residual stress is one of the main influential factors. Using finite element analysis software ABAQUS, a multi-sequentially coupling finite element program was developed to calculate the welding residual stress for half-pipe jacket of 304 stainless steel. The moving Gaussian heat source was realized using the subroutine DFLUX complied by FORTRAN language. With this program and subroutine, 3-D welding residual stress field of T-joint for half-pipe was obtained and analyzed. The result shows that the stress is much larger near the T-joint zone, which induces the cracking and leakage easily sometimes.The analysis from calculation result provides theory references for optimizing the welding parameter and controlling the welding residual stress. It is of great significance for increasing the reliability and safety of half-pipe jacket equipment.