玻纤增强柔性管结构敏感性研究与数值分析

Structural sensitivity study and numerical analysis of glass fiber-reinforced flexible pipes

针对在海洋油气开采中传统钢管质量大、易腐蚀老化等问题,亟需找到一种质量小、强度高且耐腐蚀的新型柔性管道,选用玻纤增强柔性管开展了研究,基于复合材料层合板理论建立了玻纤增强柔性管的理论模型,采用ABAQUS建立了管道整体的有限元模型,通过相关文献验证了模型的准确性,分析了缠绕角度在拉伸、压缩、弯曲、拉伸-弯曲以及压缩-弯曲5种荷载工况下对管道应力的影响,并着重分析了拉伸工况下增强层缠绕层数对管道应力的影响.结果表明:柔性管增强层是管道主要的承载结构.综合5种工况模拟结果,得到柔性管增强层最佳缠绕角度为(±45°)~(±55°),增强层缠绕层数在4~16层时,柔性管承载能力有较大提高,超过16层后,承载能力无明显提高.

Aimed at solving the problems of high quality and easy corrosion and aging of traditional steel pipes in offshore oil and gas exploitation,a new type of flexible pipe with low quality and high strength and corrosion re⁃sistance is urgently needed.In the report,the glass fiber reinforced flexible pipe was selected for research.Based on the theory of composite laminates,a theoretical model of glass fiber reinforced flexible pipe was con⁃structed,ABAQUS was used to construct the finite element model of the pipeline.After the accuracy of the mod⁃el was verified with the relative literatures,the stress effects of winding angle on the pipe under five load condi⁃tions,tension,compression,bending,tensile-bending,and compression-bending were analyzed,and the influ⁃ence of the number of winding layers of the reinforcement layer on the stress of the pipeline under tensile condi⁃tions was also analyzed.The results showed that the flexible pipe reinforcement layer is the main bearing struc⁃ture of the pipeline.Based on the simulation results of five working conditions,the optimal winding angle of the flexible pipe reinforcement layer was(±45°)~(±55°),and when the number of winding layers of the reinforce⁃ment layer was 4~16 layers,the bearing capacity of the flexible pipe was greatly improved,and after more than 16 layers,the bearing capacity was not significantly improved.