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Elbows are an important component of oil and gas pipelines. The force state and the medium flow state are more complex than that of the straight pipe. Once the defect occurs at the elbow, the elbow pipe is more prone to fail. The high steel grade pipeline is the development trend of the long distance oil and gas pipeline construction, and it is urgent to evaluate the residual strength of the high steel grade bending pipe. Through the establishment of the finite element model, the defect size, relative position, bending radius, pipe parameters and pipe performance influence were studied on the ultimate internal pressure of the elbow, and finally the prediction formula of the bending was established. The results show that with the increase of defect length and defect depth, the ultimate internal pressure of the elbow is significantly reduced. The trench defect affects the ultimate internal pressure when the trench defect is located in the inner arch of the elbow. The bending radius, the wall thickness and the pipe material will affect the ultimate internal pressure. The error analysis shows that the prediction formula is more accurate, which can provide the basis for the residual strength evaluation of high steel grade elbows with trench defects.
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弯管是油气管道中的重要组成部分,其受力状态和介质流动状态相较于直管更为复杂,一旦在弯头处产生缺陷,弯管更容易发生失效。高钢级管道是长距离油气管道建设的发展趋势,所以急需开展对高钢级弯管剩余强度评价的工作。以含沟槽缺陷的高钢级弯管作为研究对象,通过建立有限元模型,研究缺陷尺寸、相对位置、弯曲半径、管道参数及管材性能对弯管极限内压的影响规律,最后建立含沟槽缺陷高钢级弯管的极限内压预测公式。研究结果表明,随着缺陷长度和缺陷深度的增加,弯管的极限内压明显降低;沟槽缺陷位于弯管的内拱处时对极限内压影响最大;弯曲半径、管径壁厚及管材都会对弯管极限内压产生影响;误差分析显示拟合所得到的预测公式精度较高,该公式可为含沟槽缺陷高钢级弯管的剩余强度评价提供依据。
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张颖(通信作者),男,1972年生,黑龙江北安人,博士,教授;主要研究方向为特种设备健康监测与结构完整性评价等;E-mail:
aezy163@163.com。
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张涛,男,1999年生,江苏常州人,硕士研究生;主要研究方向为特种设备健康监测及智能诊断;E-mail:1216702570@qq.com。
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张涛,男,1999年生,江苏常州人,硕士研究生;主要研究方向为特种设备健康监测及智能诊断;E-mail:1216702570@qq.com。
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2.Qingdao Qinggang Tongda Energy Co., Ltd., Qingdao 266555, China), AuthorCompanyExt(id=1241049276588028171, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, companyId=1241049276529307912, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2.青岛青港通达能源有限公司,青岛 266555)]), AuthorCompany(id=1241049276848075024, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, xref=3., ext=[AuthorCompanyExt(id=1241049276860657938, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, companyId=1241049276848075024, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.Oil and Gas Technology Research Institute, Changqing Oilfield Company, Xi’an 710018, China), AuthorCompanyExt(id=1241049276869046547, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, companyId=1241049276848075024, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3.长庆油田分公司 油气工艺研究院,西安 710018)])], figs=[ArticleFig(id=1241049283324080599, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.1, caption=
Mesh division of the finite element model, figureFileSmall=QEozG7U+sK0ep+dnD1wk2g==, figureFileBig=w/bwU7XhOZhg2CEr2aE6hA==, tableContent=null), ArticleFig(id=1241049283433132510, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图1, caption=
有限元模型网格划分, figureFileSmall=QEozG7U+sK0ep+dnD1wk2g==, figureFileBig=w/bwU7XhOZhg2CEr2aE6hA==, tableContent=null), ArticleFig(id=1241049285194740207, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.2, caption=
Position relation of the defect and the pipe elbow, figureFileSmall=a2t9/xmqG7YSXoGp8aqMPg==, figureFileBig=9NhcLunKUSRwr/H2IqI3Qw==, tableContent=null), ArticleFig(id=1241049285492535800, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图2, caption=
缺陷与管道弯头的位置关系, figureFileSmall=a2t9/xmqG7YSXoGp8aqMPg==, figureFileBig=9NhcLunKUSRwr/H2IqI3Qw==, tableContent=null), ArticleFig(id=1241049285765165569, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.3, caption=
True stress-strain curve of X80 steel pipe, figureFileSmall=kgbj+qSz7HAVOiVzieQ+hA==, figureFileBig=NdkiQn6giJ+0D10PU6xSww==, tableContent=null), ArticleFig(id=1241049285979075077, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图3, caption=
X80钢级材料真实应力-应变曲线, figureFileSmall=kgbj+qSz7HAVOiVzieQ+hA==, figureFileBig=NdkiQn6giJ+0D10PU6xSww==, tableContent=null), ArticleFig(id=1241049286167818761, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.4, caption=
Stress nephogram of the defective pipe elbow under different inner pressures, figureFileSmall=bqZezKtjSiwTGCRCBx7GCw==, figureFileBig=2T7qxmr2LVDn0cERYYZaHQ==, tableContent=null), ArticleFig(id=1241049286352368143, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图4, caption=
不同内压下的含缺陷弯管的应力场云图, figureFileSmall=bqZezKtjSiwTGCRCBx7GCw==, figureFileBig=2T7qxmr2LVDn0cERYYZaHQ==, tableContent=null), ArticleFig(id=1241049286528528922, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.5, caption=
Effect of relative defect depths on the ultimate inner pressure of the pipe elbow, figureFileSmall=euJYt6UOxca2RcdxSYCXbg==, figureFileBig=pFsqRVNbcgzGRgAe/gaqFg==, tableContent=null), ArticleFig(id=1241049286675329569, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图5, caption=
缺陷相对深度对弯管极限内压的影响规律, figureFileSmall=euJYt6UOxca2RcdxSYCXbg==, figureFileBig=pFsqRVNbcgzGRgAe/gaqFg==, tableContent=null), ArticleFig(id=1241049286838907431, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.6, caption=
Effect of defect lengths on the ultimate inner pressure of the pipe elbow, figureFileSmall=AYxzFChdduL26FnmYYKteg==, figureFileBig=TLJ0g+GAeZC4T0lac6xNsg==, tableContent=null), ArticleFig(id=1241049286989902381, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图6, caption=
缺陷长度对弯管极限内压的影响, figureFileSmall=AYxzFChdduL26FnmYYKteg==, figureFileBig=TLJ0g+GAeZC4T0lac6xNsg==, tableContent=null), ArticleFig(id=1241049287073788469, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.7, caption=
Effect of defect position on the ultimate inner pressure of the pipe elbow, figureFileSmall=ljOrF/VRBgwRZ74nwx3cJw==, figureFileBig=FAUu1T/tIoiiFj94PL+sEQ==, tableContent=null), ArticleFig(id=1241049287153480250, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图7, caption=
缺陷位置对弯管极限内压的影响, figureFileSmall=ljOrF/VRBgwRZ74nwx3cJw==, figureFileBig=FAUu1T/tIoiiFj94PL+sEQ==, tableContent=null), ArticleFig(id=1241049287312863809, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.8, caption=
Stress nephogram of the defective pipe elbow at different clock angles, figureFileSmall=1QOJfj7VmQhhcUSzv5Wufg==, figureFileBig=eC+ZqfMubh3KsIHiqG8U2A==, tableContent=null), ArticleFig(id=1241049287577104968, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图8, caption=
不同时钟角度下的含缺陷弯管的应力场云图, figureFileSmall=1QOJfj7VmQhhcUSzv5Wufg==, figureFileBig=eC+ZqfMubh3KsIHiqG8U2A==, tableContent=null), ArticleFig(id=1241049287757460049, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.9, caption=
Effect of bending radii on the ultimate inner pressure of the pipe elbow, figureFileSmall=PFk3wCtZgnRAk7zGu1f0mQ==, figureFileBig=fkjLNrhNu5zZgPaZvzlsPg==, tableContent=null), ArticleFig(id=1241049287925232214, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图9, caption=
弯曲半径对弯管极限内压的影响, figureFileSmall=PFk3wCtZgnRAk7zGu1f0mQ==, figureFileBig=fkjLNrhNu5zZgPaZvzlsPg==, tableContent=null), ArticleFig(id=1241049288051061340, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.10, caption=
Effect of pipeline sizes on the ultimate inner pressure of the pipe elbow, figureFileSmall=NMZV9on/haBdk8/OugBBYg==, figureFileBig=8iQmXwOp/jv7tx791TDwBQ==, tableContent=null), ArticleFig(id=1241049288202056288, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图10, caption=
管道尺寸对弯管极限内压的影响, figureFileSmall=NMZV9on/haBdk8/OugBBYg==, figureFileBig=8iQmXwOp/jv7tx791TDwBQ==, tableContent=null), ArticleFig(id=1241049289766531686, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.11, caption=
Effect of material parameters on the ultimate inner pressure of the pipe elbow, figureFileSmall=ktUu4h/Snl18cLnkZgwvTw==, figureFileBig=7bbkLhKYokHhXRAIkLRFEQ==, tableContent=null), ArticleFig(id=1241049290248876651, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图11, caption=
材料参数对弯管极限内压的影响, figureFileSmall=ktUu4h/Snl18cLnkZgwvTw==, figureFileBig=7bbkLhKYokHhXRAIkLRFEQ==, tableContent=null), ArticleFig(id=1241049290810913393, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Fig.12, caption=
Error analysis of prediction formulas of the ultimate inner pressure, figureFileSmall=WN8bX3Vb+2ZPOXAPDw+sXw==, figureFileBig=DzpDDcslXAtvuKYhBoJK/g==, tableContent=null), ArticleFig(id=1241049290890605176, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=图12, caption=
极限内压预测公式误差分析, figureFileSmall=WN8bX3Vb+2ZPOXAPDw+sXw==, figureFileBig=DzpDDcslXAtvuKYhBoJK/g==, tableContent=null), ArticleFig(id=1241049290974491261, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=EN, label=Tab.1, caption=
Validation results of the finite element model
, figureFileSmall=null, figureFileBig=null, tableContent=
序号 Serial number | 管径 Pipe diameter/mm | 壁厚 Wall thickness/mm | 缺陷长度 Defect length/mm | 缺陷宽度 Defect width/mm | 缺陷深度 Defect depth/mm | 极限内压 Ultimate inner pressure/MPa | 爆破失效压力 Burst failure pressure/MPa | 相对误差 Relative error/% |
|---|
| 1 | 133 | 4.1 | 24 | 20.50 | 2.60 | 29.78 | 29.00 | 2.69 |
| 2 | 133 | 4.1 | 54 | 20.50 | 2.60 | 23.15 | 22.00 | 5.23 |
| 3 | 72 | 7.0 | 91.44 | 128.93 | 5.50 | 34.66 | 35.90 | 3.45 |
), ArticleFig(id=1241049291062571653, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1241049259211026514, language=CN, label=表1, caption=
有限元模型验证结果
, figureFileSmall=null, figureFileBig=null, tableContent=
序号 Serial number | 管径 Pipe diameter/mm | 壁厚 Wall thickness/mm | 缺陷长度 Defect length/mm | 缺陷宽度 Defect width/mm | 缺陷深度 Defect depth/mm | 极限内压 Ultimate inner pressure/MPa | 爆破失效压力 Burst failure pressure/MPa | 相对误差 Relative error/% |
|---|
| 1 | 133 | 4.1 | 24 | 20.50 | 2.60 | 29.78 | 29.00 | 2.69 |
| 2 | 133 | 4.1 | 54 | 20.50 | 2.60 | 23.15 | 22.00 | 5.23 |
| 3 | 72 | 7.0 | 91.44 | 128.93 | 5.50 | 34.66 | 35.90 | 3.45 |
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