A finite element analysis for unbonded flexible risers under bending loads

IF 0.9 Q4 ENGINEERING, OCEAN Ocean Systems Engineering-An International Journal Pub Date : 2015-06-25 DOI:10.12989/OSE.2015.5.2.077

Chen Xiqia, Fu Shixiao, Gaojie Yun, Du Xiaying

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引用次数: 3

Abstract

【As the exploitation of oil and gas resources advances into deeper waters and harsher environments, the design and analysis of the flexible risers has become the research focus in the offshore engineering filed. Due to the complexity of the components and the sliding between the adjacent layers, the bending response of the flexible risers is highly non-linear. This paper presents the finite element analysis of the flexible risers under bending loads. The detailed finite element model of the flexible riser is established in ABAQUS software. This finite element model incorporates all the fine details of the riser to accurately predict its nonlinear structural behavior. Based on the finite element model, the bending moment-curvature relationships of a flexible riser under various axisymmetric loads have been investigated. The results have been compared with the analytical ones obtained from the literature and good agreements have been found. Moreover, the stress of the tendon armors has been studied. The non-linear relationship between the armor tendons' stress and the bending loads has been obtained.】

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弯曲载荷作用下无粘结柔性立管的有限元分析

随着油气资源开发向更深的水域和更恶劣的环境推进，柔性隔水管的设计与分析已成为海洋工程领域的研究热点。由于构件的复杂性和相邻层间的滑动，柔性隔水管的弯曲响应是高度非线性的。本文对挠性立管在弯曲载荷作用下进行了有限元分析。在ABAQUS软件中建立了柔性立管的详细有限元模型。该有限元模型包含了立管的所有细节，可以准确地预测其非线性结构行为。基于有限元模型，研究了柔性隔水管在各种轴对称载荷作用下的弯矩-曲率关系。将所得结果与文献分析所得结果进行了比较，两者吻合较好。此外，还对腱甲的应力进行了研究。得到了装甲肌腱应力与弯曲载荷之间的非线性关系。

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来源期刊

Ocean Systems Engineering-An International Journal ENGINEERING, OCEAN-

自引率

22.20%

发文量

期刊介绍： The OCEAN SYSTEMS ENGINEERING focuses on the new research and development efforts to advance the understanding of sciences and technologies in ocean systems engineering. The main subject of the journal is the multi-disciplinary engineering of ocean systems. Areas covered by the journal include; * Undersea technologies: AUVs, submersible robot, manned/unmanned submersibles, remotely operated underwater vehicle, sensors, instrumentation, measurement, and ocean observing systems; * Ocean systems technologies: ocean structures and structural systems, design and production, ocean process and plant, fatigue, fracture, reliability and risk analysis, dynamics of ocean structure system, probabilistic dynamics analysis, fluid-structure interaction, ship motion and mooring system, and port engineering; * Ocean hydrodynamics and ocean renewable energy, wave mechanics, buoyancy and stability, sloshing, slamming, and seakeeping; * Multi-physics based engineering analysis, design and testing: underwater explosions and their effects on ocean vehicle systems, equipments, and surface ships, survivability and vulnerability, shock, impact and vibration; * Modeling and simulations; * Underwater acoustics technologies.