摘要
在油气管道运输过程中,由于荷载和腐蚀介质等因素,弯管相比直管更容易发生腐蚀。以点蚀缺陷为研究对象,建立含有点蚀缺陷弯管的三维非线性有限元模型,进一步分析了点蚀缺陷的位置、缺陷的几何形状和管材性能等因素对弯管极限内压的影响。研究结果表明,含点蚀缺陷弯管的极限内压受缺陷相对位置的影响,当缺陷位于弯管的内拱时,弯管的极限内压最小;含点蚀缺陷弯管的极限内压同样受缺陷尺寸的影响,极限内压随点蚀缺陷深度增加而减小,随点蚀缺陷半径增大而减小;管道尺寸、管道弯曲半径和管材性能等敏感因素也会对管道极限内压产生影响。研究结论对于含缺陷弯管的安全评定有一定的参考价值。
In the process of oil and gas pipeline transportation,elbows are more prone to corrosion compared to straight pipes due to the factors such as load and corrosive media.This article takes pitting defects as the research object.A three-dimensional(3D)nonlinear finite element(FE)model of elbows with pitting defects was established.It further analyzes the influence of factors such as the relative position of defects,the geometric size of defects,and the material properties of elbows.The research results indicate that the ultimate internal pressure of the elbow with pitting defects is influenced by the relative position of the defects.When the defects are located at the inner arch of the elbow,the ultimate internal pressure of the elbow is the smallest.Moreover,the ultimate internal pressure of the elbow with pitting defects is also affected by the size of the defect.The ultimate internal pressure decreases with increase of the depth of the pitting defects and the radius of the pitting defects.Sensitive factors such as pipeline size,pipeline bending radius,and material properties can also have an impact on the ultimate internal pressure of pipelines.Therefore,the conclusions obtained have certain reference value for the safety assessment of elbows with pitting defects.
作者
张延兵
张涛
孙佶沛
赵永涛
张颖
ZHANG Yanbing;ZHANG Tao;SUN Jipei;ZHAO Yongtao;ZHANG Ying(Jiangsu Institute of Safety Supervision and Inspection of Special Equipment,Nanjing 210000,China;School of Safety Science and Engineering,Changzhou University,Changzhou 213164,China;CNPC Safety and Environmental Protection Technology Research Institute Co.,Ltd.,Beijing 102206,China)
出处
《常州大学学报（自然科学版）》
CAS
2024年第2期75-84,共10页
Journal of Changzhou University：Natural Science Edition
基金
中国石油常州大学创新联合体资助项目(2021DQ06)。
关键词
点蚀
弯管
极限内压
有限元分析
等效应力
pitting defects
elbows
ultimate internal pressure
finite element analysis
equivalent stress
