摘要
以大型通用有限元软件ANSYS为基础,建立了对焊管道三维有限元计算模型。通过对焊接温度场、应力场计算结果的分析,得出了对焊管道焊接残余应力的应力集中区域以及焊接残余应力在管道厚度方向的分布规律。分析结果表明:线热源无法准确模拟出施焊过程中焊缝的热交换过程和熔池现象;管道对接焊时,会在施焊终点处形成较大的应力集中区域;在管道内、外表面,径向残余应力在焊趾处均表现为拉应力,随距焊趾距离的增加迅速转化为压应力,轴向残余应力在管道外表面表现为压应力,在管道内表面表现为拉应力;在管道厚度方向,径向残余应力在焊趾处表现为拉应力,并随深度的增大而增大,轴向残余应力在近外表面区域表现为压应力,随着深度的增大,逐渐转化为拉应力。
Three dimensional finite element model of welding pipes was built based on the large popular finite element software ANSYS. The distribution law of stress concentration region of residual stress of butt-welded pipeline was studied through the analysis of calculation results of temperature and stress fields. Meanwhile, the law of welding residual stress in the thickness direction was also analyzed. The results show that line heat source can not accurately simulate the heat exchange and pool phenomenon of seam in the welding process; larger stress concentration regions will appear in the end point of welding parts; in the inner and outer surface, radial residual stress in the welding toes becomes tensile stress, and it turns into compressive stress with the increase in the distance from welding toes; however, the axial residual stress becomes compressive stress in the outer surface of pipeline and turns into the tensile one in the inner side; fourthly, radial residual stress is the tensile one in the welding toe and increases with the depth in the pipeline thickness direction; however, the axial residual stress is the compressive one in the near surface region and gradually turns into tensile one with the increase in the depth.
出处
《钢结构》
北大核心
2015年第4期77-81,共5页
Steel Construction
基金
国家重点基础研究发展计划(973计划)项目(2014CB046801
2014CB046804)
国家自然科学基金(KYGYJJGJ1203)
关键词
焊接残余应力
面热源
应力集中
有限元分析
welding residual stress
surface heat source
stress concentration
finite element analysis
作者简介
白林越，男，1989年出生，硕士研究生。Email：baily016@126．com
