摘要
热塑性复合材料柔性管（Thermoplastic Composite Flexible Pipe, TCFP）是一种完全非金属纤维增强复合材料管道，具有轻质高强、抗疲劳、耐腐蚀等综合优势，是金属增强柔性管的潜在替代品。为系统评估其承压性能，研究基于三维各向异性弹性理论与最小势能原理，建立了TCFP在内压下的应力-应变场理论模型，并通过Abaqus建立精细化有限元模型进行对比验证，结果表明理论模型与有限元模型在应力分布上具有较好的一致性。进一步结合改进的Hashin失效准则，分析了抗拉层与抗压层的缠绕角度和相对厚度对首层失效压力的影响。通过对847组参数组合的系统计算，得到了以下结论：（1）随着抗拉层与抗压层的厚度比的增大，抗拉层和抗压层的最佳缠绕角度的总体趋势也在增大；（2）失效位置均位于抗压层，约89%为基体拉伸失效；（3）提高抗压层基体拉伸强度是提升TCFP首层失效压力的有效途径。本研究为TCFP的结构设计与性能优化提供了理论依据与分析手段，对其工程应用具有一定的参考价值。
关键词： 热塑性复合材料柔性管；理论模型；有限元；失效准则；首层失效压力
Abstract
The Thermoplastic Composite Flexible Pipe (TCFP) is a fully-non-metallic, fiber-reinforced composite pipe. It offers a combination of lightweight structure, high strength, excellent fatigue resistance, and superior corrosion resistance, making it a promising alternative to conventional unbonded flexible pipes. To evaluate its pressure-bearing capacity, this study established a theoretical model for the stress-strain distribution of TCFP under internal pressure. This model is formulated based on three-dimensional anisotropic elasticity theory and the principle of minimum potential energy. Its accuracy is validated through comparison with a refined finite element model developed in Abaqus, showing good agreement across the stress field. Further, by incorporating a modified Hashin failure criterion, this study examines the influence of the winding angles and relative layer thicknesses of the tensile and pressure armor layers on the first-ply failure pressure. A systematic evaluation of 847 parameter configurations yields the following findings: (1) As the thickness ratio of the tensile armor layers to the pressure armor layer increases, the optimal winding angles of both armor layers exhibit an overall increasing trend. (2) Failure consistently occurs in the pressure armor layer, with approximately 89% attributed to matrix tensile failure. (3) Increasing the matrix tensile strength of the pressure armor layer effectively enhances the first-ply failure pressure of TCFP. This work provides a theoretical basis and analytical framework for the structural design and performance optimization of TCFP, offering guidance for its engineering application.
Key words： Thermoplastic composite flexible pipe; Theoretical model; Finite element; Failure criterion; First-ply failure pressure
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