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魏化中
1,2
,
陈文霞
2,
舒安庆
1,2
(1.
武汉市压力容器压力管道安全工程研究中心
,
湖北武汉
430073
2.
武汉工程大学机械工程学院
,
湖北武汉
430073)
摘要
:
凹坑是埋地管道中常见的体积型缺陷
,
是一种破坏性较大的局部缺陷
,
而弯管是埋地管道中的重要管件｡应用有限元分析软件
ANSYS ,
对含球型凹坑缺陷的燃气管道弯管在内压载荷作用下进行有限元分析
,
分析中考虑材料非线性和几何非线性
,
根据腐蚀区的载荷
-
应变图
,
对模型的塑性极限压力进行了预测
,
并得出了缺陷尺寸对塑性极限载荷的影响及变化规律
,
得到了一些对含缺陷弯管的安全评定有参考价值的结论｡
关键词
:
弯管
;
凹坑
;
塑性极限载荷
Research on the Plastic Limit Load of Gas Pipe Elbow with Pitting Corrosion
Research on the Pla stic L im it Load of Gas Pipe Elbow with Pitting Corrosion
WEIHua2zhong1, 2 , CHEN Wen2xia2 , SHU An2qing1, 2
( 1. Wuhan Research Cen ter of Pressure Vessel and Pipeline Safety Eng ineer ing,Wuhan 430073, China;
2. School ofMechan ica l Eng ineer ing,Wuhan In stitute of Technology,Wuhan 430073, China)
Abstract:
A part2through slotwhich is a common three2dimensional defect on the surface of buried p ipes, is one of destructive local defect. Elbow is a type of componentwidely used in the buried p ipelines. As a computationalmethod, FEM is adop ted to cal-culate the collap se p ressurized with p itting corrosion, by taking the immense deformation effects and stress stiffening into considera-tion. In light of the geometrical parameter, the effect of defects on the p lastic limit load are obtained and some referential conclusion
is drawn for the security assessment of elbowswith defects.
Key words:
elbow; p itting corrosion; p lastic limit load
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