多缺陷相互作用及对油气管道强度影响研究  

Interaction of Multi Defect and Its Influence Study on the Strength of Oil and Gas Pipeline

作　　者：穆怀 曾祥国[1] 李洋[1] 肖雨果 耿清华[1] 

机构地区：[1]四川大学建筑与环境学院,成都610065

出　　处：《四川理工学院学报（自然科学版）》2016年第2期46-50,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：四川省应用基础研究计划项目(13JC0277);四川大学大学生创新创业训练计划项目(201510610882)

摘　　要：采用有限元数值计算方法,对单个均匀腐蚀管道进行模拟评价,得出管道的剩余强度,进而与标准的API579准则评价结果进行对比分析,结果表明有限元计算结果与API579准则评价结果接近,验证了有限元模型的正确。对含有不同轴向间距和不同缺陷长度的两个腐蚀缺陷的管道进行计算和分析,研究发现腐蚀缺陷的长度和轴向间距并不是单独作用的参数,在计算腐蚀干涉极限影响距离时应考虑其相互影响。通过ABAQUS有限元软件计算分析,拟合得到腐蚀缺陷在不同长度下的极限距离影响公式。该公式综合考虑了两腐蚀缺陷的长度和腐蚀轴向间距的影响,可以用于快速判断两腐蚀缺陷之间是否发生相互干涉作用。Through simulating and evaluating for pipes that contains a single uniform corrosion by using finite element numerical calculation method,and obtaining residual strength of pipeline,the result of numeral calculations compared with standard API 579 guidelines have shown that the results of the standard API 579 guidelines were close to the result of finite element simulation,the corrcetness of finite element model was verified. Calculated and analyzed for pipeline containing two different axial spacing corrosion defects,the study found corrosion defect length and axial spacing parameters were not a single parameter. Considering their mutual influence when calculating limit interference distance,calculated by ABAQUS finite element analysis software,the formula for limit effect distance of corrosion defect in different length was obtained,which has taken into account the influence of the length of corrosion and axially spaced. It can quickly determine whether is mutual interference effects between the two corrosion defects.

关 键 词：有限元 剩余强度 API579 腐蚀缺陷长度 腐蚀缺陷轴向间距 极限影响距离 

分 类 号：TE973[石油与天然气工程—石油机械设备]