弯曲载荷作用下含错边缺陷管道环焊缝应力计算  

Stress calculation of girth weld of pipeline with misalignment defect under bending load

作　　者：田野 邹斌 陈翠翠 丁融 李坤 白强 TIAN Ye;ZOU Bin;CHEN Cuicui;DING Rong;LI Kun;BAI Qiang(West Pipeline Company of PipeChina,Urumchi 830013,China;Tubular Goods Research Institute of CNPC,Xi′an 710077,China)

机构地区：[1]国家管网集团西部管道有限责任公司,乌鲁木齐830013 [2]中国石油集团工程材料研究院有限公司,西安710077

出　　处：《压力容器》2023年第1期61-67,共7页Pressure Vessel Technology

摘　　要：滑坡等地质灾害引起的弯曲载荷是导致环焊缝失效的重要因素,管道环焊缝焊接过程中的错边缺陷,容易形成局部应力集中,除设计压力外,环焊缝还能承受的弯曲载荷已成为管道完整性管理中的重点和难点。基于有限元分析数据提出了一种针对弯曲载荷作用下含错边缺陷环焊缝的应力计算方法。首先,给出了管道承受均匀内压和弯曲载荷的近似解析计算公式;然后,针对无错边和含错边缺陷的环焊缝开展有限元计算,采用子模型方法兼顾了大跨度模型的计算效率和环焊缝的计算精度;最后,基于有限元分析数据对经典解析公式进行修正,得到管道环焊缝单点应力的计算公式。经验证,该方法与有限元结果相差1%以内,可适用于弯曲载荷作用下的环焊缝应力计算,是一种可用于工程强度快速评估的精确分析方法。Bending loads caused by geological disasters such as landslides are one of the important factors leading to the failure of girth welds.Misalignment defect is a common defect in the welding process of pipeline girth welds.Misalignment defects will generate local stress concentration.In addition to design pressure,how much bending load can girth welds withstand has become the focus and difficulty in pipeline integrity management.A stress calculation method of girth welds with misalignment defects under external loads was proposed based on finite element analysis data.Firstly,the classical analytical formulas for the uniform internal pressure and bending load which the pipeline withstands were given;Secondly,finite element calculations were carried out for the girth welds with/without misalignment defects,and the sub-model method was used to balance the computational efficiency of the large-span model and the calculation accuracy of the girth weld.Finally,the classical analytical formula was corrected based on the finite element analysis data,and the single point stress of the pipeline girth weld was obtained.Compared with the finite element results,the formula error of this method can be controlled within 1%.This method is validated to be suitable for the calculation of girth weld stress under the bending deformation,and is an accurate and fast analysis method for strength evaluation in engineering.

关 键 词：油气管道 环焊缝 弯曲载荷 应力计算 

分 类 号：TH123[机械工程—机械设计及理论] TE973[石油与天然气工程—石油机械设备]