Bending Failure Mode and Prediction Method of the Compressive Strain Capacity of A Submarine Pipeline with Dent Defects  

作　　者：HOU Fu-heng JIA Lu-sheng CHEN Yan-fei ZHANG Qi ZHONG Rong-feng WANG Chun-sha 

机构地区：[1]School of Mechanical and Transportation Engineering,China University of Petroleum,Beijing,Beijing 102249,China [2]CNOOC Research Institute Ltd.Beijing 100028,China

出　　处：《China Ocean Engineering》2024年第4期636-647,共12页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52171285)。

摘　　要：A dent is a common type of defects for submarine pipeline.For submarine pipelines,high hydrostatic pressure and internal pressure are the main loads.Once pipelines bend due to complex subsea conditions,the compression strain capacity may be exceeded.Research into the local buckling failure and accurate prediction of the compressive strain capacity are important.A finite element model of a pipeline with a dent is established.Local buckling failure under a bending moment is investigated,and the compressive strain capacity is calculated.The effects of different parameters on pipeline local buckling are analyzed.The results show that the dent depth,external pressure and internal pressure lead to different local buckling failure modes of the pipeline.A higher internal pressure indicates a larger compressive strain capacity,and the opposite is true for external pressure.When the ratio of external pressure to collapse pressure of intact pipeline is greater than 0.1,the deeper the dent,the greater the compressive strain capacity of the pipeline.And as the ratio is less than 0.1,the opposite is true.On the basis of these results,a regression equation for predicting the compressive strain capacity of a dented submarine pipeline is proposed,which can be referred to during the integrity assessment of a submarine pipeline.

关 键 词：submarine pipeline dent defect bending load local buckling compressive strain capacity 

分 类 号：P756.2[天文地球—海洋科学]