Considering that submarine oil and gas pipelines are susceptible to damage and destruction caused by impact and corrosion,based on the Coupled Euler-Lagrange(CEL)algorithm,a finite element model of falling object-corroded pipeline-seabed soil impact was built to analyze the influence of falling object mass,velocity,bur-ied depth and corrosion depth on the damage of pipeline containing corrosion defects,and a comparison was made with uncorroded intact pipelines.Then,the influence of internal pressure and corrosion depth on the stress of cor-roded pipelines after impact was analyzed.The results show that the impact damage values of pipelines with corro-sion defects are greater than that of intact pipelines.Under the same impact speed,mass and buried depth,the maximum difference in impact damage values is 68.6%,14.3%and 194.7%respectively.The maximum equiva-lent stress of corroded pipeline and intact pipeline after impact increases with the increase of internal pressure,and the maximum difference in equivalent stress value of the same internal pressure is 50.4%.At the same corrosion depth,the maximum difference in equivalent stress value of non-impacted corroded pipelines and impacted corro-ded pipelines is 11.7%.This indicates that corrosion defects should be considered when conducting impact damage analysis of submarine oil and gas pipelines.The research method and results provide reference for the impact dam-age analysis and evaluation of submarine oil and gas pipelines.
关键词
海底管道/腐蚀管道/冲击载荷/冲击损伤/管道损伤/有限元模型
Key words
submarine pipeline/corroded pipeline/impact load/impact damage/pipeline damage/finite el-ement model
维普
万方数据