Anti-impact performance analysis of single-layer and double-layer full scale submarine pipelines

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 286-296.

XIE Liyuan, SHAO Yongbo, GAO Xudong

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Abstract

Besides conventional loads, submarine pipelines may be damaged by various unexpected impact loads. Here, to study dynamic characteristics of submarine pipelines under lateral impact load, drop hammer impact tests were conducted for 3 single-layer and one double-layer full-scale pipelines. Failure mode, impact force time history curve, displacement time history one and strain time history one of pipelines under transverse impact were obtained. A finite element model was established to analyze failure process of submarine pipeline under impact load, and the accuracy of the model was verified through comparing with test results. Effects of impact height, material yield strength, slenderness ratio and diameter to thickness ratio of pipeline on anti-impact performance of pipelineswere studied using the finite element model. Results indicated that the failure mode of submarine pipelines under impact load is bending yield at local dent, it is formed by coupling of whole bending deformation of pipeline and local bending of impact dent; compared with the single-layer pipeline, the double-layer pipeline has better anti-impact performance due toits inner layer pipe participating in anti-impact load; increasing yield strength of pipeline steel material can effectively reduce local sag deformation under impact load.

Key words

submarine pipelines / anti-impact performance / failure mode / time history curve of impact force / parametric analysis

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XIE Liyuan, SHAO Yongbo, GAO Xudong. Anti-impact performance analysis of single-layer and double-layer full scale submarine pipelines[J]. Journal of Vibration and Shock, 2021, 40(1): 286-296

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