摘要
大变形海底管道作为长距离深海油气运输的主要载体,其性能非常重要。Reel-lay卷管铺设方法是在传统的S型和J型铺管技术发展而来的可以陆上焊接的铺管技术,在卷管和铺设过程中管道会受到超过屈服强度的较大塑性变形,超出了常规意义上金属材料的力学应用范围,因此需要对管道的安全性进行工程临界评估(ECA)。含缺陷金属材料在塑性阶段的力学评估研究对于大变形海底管道的应用至关重要。工程临界评估常用方法包括EPRI法、参考应力法和参考应变法。介绍EPRI法,包括弯曲条件下管道环向裂纹的J积分解和高、低匹配V型坡口焊缝的极限载荷解,以及通过滑移线理论对冶金复合管V型坡口焊缝的等效转化方法。介绍参考应力法,包括管道极限载荷解的优化以及其在管道双轴应力条件下的修正。介绍修正的参考应变法,使之能够应用于大尺寸裂纹评估。最后将各种方法的优缺点和适用范围予以总结,并提出目前工程临界评估尚未解决的问题。
As a major carrier of long distance oil and gas transportation,the performance of large-scale deformation submarinepipelines is crucial.Reel-lay progress of submarine pipelines with large deformation develops from traditional s-lay and j-lay,whichis an onshore welding and laying technique.During the process of reeling and laying,pipelines subjects to large plastic deformationwhich is over yield strength.The deformation is beyond the common mechanical application range of metal.Therefore,it is necessaryto give an engineering critical assessment(ECA)of the pipelines for security.The mechanical evaluation of metal with defect on theplastic stage is crucial for the application of large-scale plastic submarine pipelines.The common method of ECA includes EPRIapproach,reference stress approach and reference strain approach.EPRI approach is introduced,including the J-integral solution ofpipeline with circumferential cracks under bending condition,the limit load solution of high and low mismatch V grove weld,andequivalent method of metallurgical clad pipe with V grove weld by slip-line theory.Reference stress approach is introduced,includingthe optimization of pipeline limit load solution and its modification under biaxial stress condition.The modification of reference strainapproach is introduced,and it can be used in the evaluation of severe cracks.At last,advantages,disadvantages and application rangeof different approaches are summarized.Issues of ECA are proposed.
作者
赵晓鑫
徐连勇
荆洪阳
贾鹏宇
黄江中
ZHAO Xiaoxin;XU Lianyong;JING Hongyang;JIA Pengyu;HUANG Jiangzhong(School of Materials Science and Engineering,Tianjin University,Tianjin 300072;Tianjin Key Laboratory of Advanced Joining Technology,Tianjin University,Tianjin 300072;Tianjin Special Equipment Supervision and Inspection Technology Research Institute,Tianjin 300192;Offshore Oil Engineering Co.,Ltd.,Tianjin 300452)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第2期82-90,共9页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51575382)
关键词
工程临界评估
滑移线模型
GE-EPRI
参考应力法
参考应变法
engineering critical assessment(ECA)
slip-line pattern
GE-EPRI
reference stress approach
reference strain approach
