含点蚀缺陷高钢级弯管剩余强度有限元分析

Finite Element Analysis of the Residual Strength of High Steel Bending Pipe with Pitting Defects

以点蚀缺陷为研究对象,采用有限元分析法,建立含点蚀缺陷弯管有限元模型,进一步分析了点蚀缺陷的位置和几何形状及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,当缺陷位于弯管内拱处时,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的增加而减小,随点蚀缺陷半径的增大而减小;管道尺寸、管道弯曲半径及管材性能等敏感因素也会对管道极限内压产生影响,所得结论对于含缺陷弯管的安全评定有着一定的参考价值。

Through taking pitting defects as the object of research,having finite element analysis method employed to establish the finite element model of the pipe with pitting defects was implemented,including further analyzing the influence of both location and geometric shape of the pitting defects and the pipe properties on the ultimate internal pressure of the pipe.The results show that,the relative position of the defects affects ultimate internal pressure of the pipe with pitting defects.When the defects stay at the inner arch of the pipe,the ultimate internal pressure of the pipe becomes smallest;the defect size also influences the ultimate internal pressure of the pipe with pitting defects and the ultimate internal pressure decreases with the increase of the pitting defect’s depth and the increase of the pitting defect radius.In addition,the sensitive factors such as pipe size,pipe bending radius and pipe properties also have an impact on the limit internal pressure of the pipe.The conclusions obtained have certain reference value for the safety assessment of pipes with defects.