玻纤增强柔性管等效简化模型研究

玻纤增强柔性管作为一种新型海底油气输送管道,具有比强度高、柔度大和抗腐蚀性强等特点,因此在深海油气开发中具有非常广阔的应用前景。玻纤增强柔性管主要由内衬层、增强层和外保护层组成,其中增强层的等效模拟是玻纤增强柔性管设计成功与否的关键。根据玻纤增强柔性管的结构特征和材料特性,选取了四种不同的等效简化模型,对比研究了玻纤增强柔性管在轴向拉压荷载、弯曲荷载以及内压荷载作用下的力学性能。将不同简化模型的计算结果与相应的试验数据进行对比,进行等效模型的优选。研究结果表明,在内压载荷和弯曲载荷作用下,基于Halpin-Tsai模型数值结果与试验结果最为接近。在轴向载荷作用下,采用分离式模型或回形模型计算精度更高,若材料达到屈服状态时,则建议采用分离式模型进行模拟。

Research on equivalent simplification model of glass fiber reinforced flexible pipes

As a new type of submarine pipeline for oil and gas transportation, glass fiber-reinforced flexible pipes have the characteristics of high strength, large flexibility, and strong corrosion resistance, etc. Therefore, it has a very broad application prospects in the development of deep-sea oil and gas. Glass fiber-reinforced flexible pipes are mainly composed of liner, reinforced layer and cover, in which equivalent simulation of reinforced layer is very important to successfully design the glass fiber-reinforced flexible pipes. In this paper, according to the structural characteristic and material property of glass fiber-reinforced flexible pipes, four differentequivalent simplification models have been selected for studying the mechanical performance of the glass fiber-reinforced flexible pipes under axial tension and compression load, bending load and internal pressure load, respectively. The calculation results of different simplified models have been compared with the corresponding experimental data. The results show that the numerical results based on Halpin Tsai model are close to the experimental results under the action of internal pressure and bending load. When the axial load is applied, the accuracy of the separated model or the back shape model is higher. If the material reaches the yield state, it is suggested to use the separated model to simulate it.