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海底电缆的严重弯曲会导致漏电、接地、短路和断缆等事故。通过实体实验研究海底电缆的弯曲特性存在成本高、难度大,海底电缆各层结构数据不易获取等问题。为此,文中提出了单芯光纤复合海底电缆弯曲有限元建模实验方法。对海底电缆的结构进行了简化,建立了单芯海底电缆有限元模型,选用SOLID164和SHELL163单元,利用ALE算法,结合扫略和映射方法进行网格划分,对模型进行了求解,根据力学和结构特性对海底电缆进行了单端约束并施加转动惯量载荷,真实地模拟了海底电缆的弯曲过程。结果表明,模型沙漏能控制在内能的1%以内,海底电缆各层应力、应变数据符合弹塑性材料特性和工程经验,为海底电缆弯曲特性的研究和光纤传感技术的应用提供了参考。
Submarine cable serious bending can lead to leakage, grounding, short circuit and cable break and other accidents. Entanglement characteristics of submarine cable through physical experiment have the problems of high cost, high difficulty and difficult to obtain the structural data of each submarine cable. Therefore, this paper presents a single core optical fiber composite submarine cable bending finite element modeling experimental method. The structure of the submarine cable was simplified. The finite element model of the single submarine cable was established. The SOLID164 and SHELL163 units were selected. The model was solved by using the ALE algorithm combined with the sweep and mapping method. According to the mechanics and structure The characteristics of single-ended submarine cable constraints and the application of moment of inertia load, the true simulation of the submarine cable bending process. The results show that the model hourglass can be controlled within 1% of the internal energy. The stress and strain data of the submarine cables conform to the elastoplastic properties and engineering experience, which provides a reference for the bending characteristics of submarine cables and the application of optical fiber sensing technology.