深海保温输油管后屈曲及屈曲传播的有限元分析  

Finite Element Analysis for Post-Buckling and Buckle Propagation of Undersea Thermal Insulation Pipelines

作　　者：林积新 薛江红[1] 陈叔华[1] 张建文[1] 

机构地区：[1]暨南大学力学与土木工程系重大工程灾害与控制教育部重点实验室,广东广州510632

出　　处：《力学季刊》2016年第3期590-598,共9页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(11172113)

摘　　要：本文运用ABAQUS有限元软件模拟深海输油管道的后屈曲及屈曲传播现象.将深海输油管道视为内、外层为合金钢材,夹心为聚氨酯泡沫的输油管道.采用线弹性-线性硬化的本构关系,运用Riks分析法获得后屈曲平衡路径,以此模拟管道中的屈曲传播过程,并获得屈曲传播压力.通过数值算例,综合讨论了不同初始缺陷、不同径厚比、不同夹层与夹心厚度比对、不同的材料弹性模量对屈曲传播过程和压力的影响.最后将输油管退化为单层管,将传播压力的有限元结果与实验结果、Palmer理论解比较.结果表明有限元值、实验结果、理论值三者比较吻合.验证了有限元分析的正确性.This paper presents a finite-element approach to simulate the unique phenomenon of post-buckling and buckle propagation in undersea thermal insulation pipelines. The thermal insulation pipelines consist of a polyurethane foam core, sandwiched between an outer and an inner pipe made of steel. A bilinear elasto-plastic material model is used to describe the stress-strain relationship in the pipes after collapsing. Using Riks method the post-buckling equilibrium path is obtained and is used to simulate the buckle propagation procedure. Buckle propagation pressure is acquired from the post-buckling analysis. Parametric analyses are conducted to investigate the effect of initial imperfection, radius-thickness ratio, facesheet-core thickness ratio and the Young’s modulus of material on the buckling and buckle propagation performances. Finally, the finite element predictions for a single wall pipeline are obtained and are compared with the available theoretical solutions and experimental results. It is found that they are in good agreement, validating the finite element simulation.

关 键 词：深海保温输油管道 后屈曲 屈曲传播 有限元分析 

分 类 号：O344.7[理学—固体力学]