含双裂纹缺陷海底管道疲劳寿命的分析  

Analysis of Fatigue Life for Subsea Pipelines with Double Cracks

作　　者：余建星[1,2] 郭帅[1,2] 吴朝晖[3] 黄福祥[3] 李妍[1,2] 

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 [3]海洋石油工程股份有限公司,天津300451

出　　处：《中国海洋平台》2016年第4期66-72,共7页China offshore Platform

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB046804);国家自然科学基金资助项目(51239008);国家自然科学基金资助项目(51379145)

摘　　要：裂纹缺陷是制约海底油气管道正常运行的关键因素,裂纹会引起管道运行期间的泄漏、断裂,双裂纹共同作用对管道的破坏更为严重。该文研究了含双裂纹缺陷管道的疲劳寿命变化规律,计算了裂纹与管道轴线夹角的变化,双裂纹之间夹角和距离变化对管道疲劳寿命的影响,并对其进行敏感性分析。结果表明,双裂纹之间夹角和距离固定,疲劳寿命随着裂纹与管道轴线夹角的增加而降低,但是变化率逐渐增加;裂纹与管道轴线夹角固定,双裂纹之间夹角和距离变化时,疲劳寿命曲线会出现多个极值点,极小值多出现在夹角为90°时。分析结果可以为海洋工程的实际情况提供参考。Crack defects are the key to determine the smooth operation ot subsea oil-gas pipelines. Crack defects would greatly increase the probability of pipelinesr leakage and frac- ture, and double cracks would cause severer damage to pipelines. Aiming at fatigue lifers vari- ation of pipelines with crack defects, calculation was adopted to analyse the sensitivity of in- cluded angle between cracks and pipelinePs axis, and sensitivity of included angle and distance between cracks. In conclusion, when angle and distance between cracks are determined, fa- tigue life of pipeline decreases at an increasing rate due to increase of angle between cracks and pipelinets axis. Besides, when angle between cracks and pipeliners axis is determined but an- gle and distance between cracks are not, there are 2 or 3 extreme value of the fatigue life, mostly located at θ= 90°. The conclusion tices. may provide reference for ocean engineering prac-tices.

关 键 词：海底管道 双裂纹 疲劳寿命 有限元分析 

分 类 号：P75[天文地球—海洋科学]