LNG低温复合软管疲劳特性及参数化分析研究  

Research on fatigue characteristics and parameterization analysis of LNGcryogenic composite hoses

作　　者：张玉[1] 熊红祥 程子云 崔腾飞 张飞凡 方加瑜 ZHANG Yu;XIONG Hongxiang;CHENG Ziyun;CUI Tengfei;ZHANG Feifan;FANG Jiayu(College of Safety and Ocean Engineering,China University of Petroleum,Beijing 102249,China;Shanghai Marine Diesel Engine Research Institute,Shanghai 201108,China)

机构地区：[1]中国石油大学(北京)安全与海洋工程学院,北京102249 [2]中国船舶集团有限公司第七一一研究所,上海201108

出　　处：《海洋工程》2024年第3期95-106,共12页The Ocean Engineering

基　　金：国家自然科学基金资助项目(52222111)。

摘　　要：LNG低温复合软管具有强度高、重量轻、柔韧性好等优点,可以满足恶劣海况下LNG的输送需求,但其结构复杂,且面临多种耦合载荷作用下的疲劳失效问题。首先建立了LNG低温复合软管的有限元模型,研究了复合软管在弯曲和内压载荷下的力学响应和弯曲疲劳寿命特性;然后改变螺旋钢丝直径、预紧间距、导程和纤维层数及摩擦系数等参数,对软管的弯曲疲劳寿命进行了参数化分析。结果表明预紧间距、导程和纤维层数对复合软管的疲劳损伤影响显著:预紧间距增大时,复合软管疲劳损伤先增大后减小;导程减小或者层数增加时,复合软管的疲劳损伤会明显减小。摩擦系数对疲劳损伤几乎没有影响。研究成果可为低温复合软管的结构设计提供理论参考。LNG cryogenic composite hoses have advantages such as high strength,lightweight,and good flexibility,which can meet the transportation needs of LNG under harsh sea conditions.However,they face fatigue failure problems due to their complex structure and various coupled load effects.Firstly,a finite element model of LNG cryogenic composite hoses was established to study the mechanical response and bending fatigue life characteristics of composite hoses under bending and internal pressure loads.Then,parameters such as the diameter of spiral steel wire,pre-tightening spacing,pitch,fiber layers,and friction coefficient were varied to perform parameterized analysis of the bending fatigue life of the hoses.The results indicate that pre-tightening spacing,pitch,and fiber layers significantly affect the fatigue damage of composite hoses:when the pre-tightening spacing increases,the fatigue damage of composite hoses first increases and then decreases;reducing the pitch or increasing the number of layers will significantly reduce the fatigue damage of composite hoses;the friction coefficient has almost no effect on fatigue damage.The research findings can provide theoretical reference for the structural design of cryogenic composite hoses.

关 键 词：LNG低温复合软管 强度分析 参数化分析 疲劳分析 

分 类 号：P756.2[天文地球—海洋科学] TE832[石油与天然气工程—油气储运工程]