摘要
在柔性立管长期服役过程中,其环空层可能出现渗透及层间摩擦问题,在交变荷载作用下加速抗拉铠装条带疲劳损伤。针对陡波型柔性立管开展安全评估,建立考虑层间摩擦及腐蚀效应的全局-局部-疲劳有限元模型,重点研究全耦合模型下柔性立管的动力响应及疲劳寿命。结果表明,层间摩擦与腐蚀效应均会影响柔性立管的在役寿命。层间摩擦主要使抗拉铠装条带应力幅值增大,而腐蚀效应不仅会减小截面尺寸,而且因腐蚀环境的存在,需要选取对应的S-N曲线,对疲劳寿命的影响更显著。因此进行在役立管评估时,应当充分考虑层间摩擦及腐蚀效应,采取有效措施对柔性立管进行完整性管理。
During the long-term service of flexible risers,problems such as permeation in the annular layer and interlayer friction may occur.Under alternating loads,the fatigue damage of the tensile armor wire will accelerate.This paper conducts a safety assessment for steep-waveform flexible risers.By establishing a global-local-failure finite element model that takes into account interlayer friction and corrosion effects,the dynamic response and fatigue life of the flexible risers under the full coupling model are mainly studied.The results show that both interlayer friction and corrosion effects will affect the in-service life of the flexible risers.Interlayer friction mainly increases the stress amplitude of the tensile armor wire,while the corrosion effect not only reduces the crosssectional size but also requires the selection of the corresponding S-N curve due to the presence of the corrosive environment.The corrosion effect has a greater impact on the fatigue life.Therefore,when conducting in-service riser assessment,interlayer friction and corrosion fatigue issues should be fully considered,and effective measures should be taken to manage the integrity of the flexible risers.
作者
冯猛
刘兴华
阳帅
陈土顺
FENG Meng;Liu Xinghua;YANG Shuai;CHEN Tushun(Zhanjiang Branch,Safety and Technology Services Co.,Ltd.,China National Offshore Oil Corporation,Zhanjiang 524057,Guangdong,China;School of Marine Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)
出处
《海洋工程装备与技术》
2025年第4期133-140,共8页
Ocean Engineering Equipment and Technology
关键词
柔性立管
层间摩擦
腐蚀效应
局部强度
疲劳寿命
flexible riser
interlayer friction
corrosion effect
local strength
fatigue life
