K型管节点焊接残余应力及其对应力集中系数的影响-中国石油大学学报.PDF

2013年摇 第37卷摇 摇 摇 摇 摇 摇 中国石油大学学报(自然科学版)摇 摇 摇 摇 摇 摇 摇 摇 Vol.37摇 No.2 摇 第2期摇 摇 摇 摇 摇 摇 摇 摇 Journal of China University of Petroleum摇 摇 摇 摇 摇 摇 摇 摇 Apr.2013 摇 摇 文章编号:1673鄄5005(2013)02鄄0130鄄05摇 摇 摇 doi:10.3969/ j.issn.1673鄄5005.2013.02.022 K型管节点焊接残余应力及其对应力集中系数的影响 蒙 占彬1,2 (1. 中国石油大学机电工程学院,山东青岛266580;2.胜利油田钻井工艺研究院,山东 东营257017) 摘要:采用有限元软件ANSYS,以K型管节点为研究对象,利用生死单元技术,模拟焊接过程和退火处理过程,研究 管节点的焊接残余应力,得到焊接温度场和应力场的分布。 分别对考虑焊接残余应力与不考虑焊接残余应力而只 考虑焊缝对结构影响的管节点模型施加轴向载荷,计算这两种模型的热点应力集中系数,得到焊接残余应力对管节 点应力集中系数的影响。 结果表明:对焊接管节点进行退火处理可以显著降低焊接残余应力,降低发生变形和断裂 失效的风险,大幅度提高管节点的安全性能;管节点结构中热点位置及热点应力集中系数与尺寸参数、载荷类型、加 载方式、焊缝结构等有关。 关键词:K型管节点;焊接残余应力;退火处理;应力集中系数 中图分类号:TE952摇 摇 摇 文献标志码:A Welding residual stress of K鄄joint and its influence on stress concentration factor MENGZhan鄄bin1,2 (1.College of Electromechanical Engineering in China University of Petroleum,Qingdao266580,China; 2.Drilling Technology Research Institute of Shengli Oilfield,Dongying 257017,China) Abstract:Using thefinite element software ANSYS,taking K鄄jointsasthe study object,numerial simulationwasperformed for theweldingprocessandtheannealingprocessusingthebirth鄄deathelementtechnology. Theweldingresidual stressofthe managed nodewas studied and the distributions of welding temperature field and stress field were obtained. The axial loads were applied on two different K鄄joint models,one with welding residual stress and the other without welding residual stress whilejust consideringtheinfluenceofwelding seamonthe K鄄joint. The stressconcentrationfactorsof thesetwomodelswere calculated and the influence of thewelding residual stress on stress concentration factor was obtained. The results show that thewelding residual stress is reduced significantly usin