裂纹参数对深水海底管道疲劳寿命的影响  

Effects of Crack Parameters on Fatigue Life of Subsea Pipelines

作　　者：余建星[1,2] 郭帅[1,2] 余杨[1,2] 李妍[1,2] 李骁[1,2] Yu Jianxing;Guo Shuai;Yu Yang;Li Yan;Li Xiao(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200240,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]高新船舶与深海开发装备协同创新中心,上海200240

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第9期889-895,共7页Journal of Tianjin University：Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB046803);国家自然科学基金资助项目(51239008;51379145);上海交通大学国家重点实验室开放基金资助项目(1502)

摘　　要：分析海底管道在运行期间产生缺陷的类型,并统计了近几年发生的海底管道事故的原因,发现裂纹缺陷的出现是引发这些管道事故的首要原因.裂纹缺陷会引发管道泄漏甚至断裂.针对裂纹缺陷对海底管道疲劳寿命的影响,考虑断裂力学的相关理论,运用ANSYS有限元软件对管道所受的载荷情况、管壁上裂纹的长度、深度等参数进行了敏感性分析,研究了各参数对管道疲劳寿命的影响规律,并得出了管道失效的主要原因.仿真结果表明:载荷区间、裂纹长度、深度变化都会对管道的疲劳寿命产生较大的影响,其中裂纹深度的变化是管道疲劳寿命的主要影响因素.分析结果可以为海洋工程实际提供参考.Main types of defects occurring during the operation of subsea pipelines were analyzed.Recent statistics of the reasons for subsea pipelines incidents shows that the crack defect is the most critical cause.Crack defect would greatly increase the probability of leakage and fracture of pipelines.With the effect of crack on the fatigue life of pipelines and the relevant theory about fracture mechanics considered,ANSYS was adopted to analyze the sensitivities of load status,crack length and crack depth to the fatigue life of pipelines.Data from simulations were summarized in order to analyze the most critical cause for those incidents.Results from simulations showed the regularity of the sensitivities,and it was also proved that the fatigue life of subsea pipelines is sensitive to all the factors above,and especially to crack depth.The conclusion may provide reference for ocean engineering practices.

关 键 词：海底管道 裂纹 疲劳寿命 有限元分析 

分 类 号：TE88[石油与天然气工程—油气储运工程]