The gradual advances of offshore oil and gas exploitation and the development tendency of equipment integration have prompted the design of a new type of the high-current composite umbilical to meet development needs. In order to study the mechanical behavior of the high-current composite umbilical (HCCU) and provide design suggestions, a theoretical analysis framework of the tension?torsion coupled behavior of the spirally wound structure is proposed, which focuses more on the radial mechanical behavior. Then, by considering the mechanical and thermal conditions during the operation of HCCU, a semi-analytical method of the tension and torsion stiffness of the high-current com- posite umbilical considering the temperature effect is established. Furthermore, a practical case of HCCU is given, and the thermal effect on the radial and axial mechanical behaviors are analyzed. It is found that the thermal effect has a significant influence on the radial stiffness, and shows non-linear variation characteristics. Finally, the sensitivity analysis is carried out to study the influence of the design parameter on the stiffness of tension and torsion. The results indicated that the equivalent radial stiffness and helical angle have obvious effect on the tension?torsion coupled stiffness, which can provide reasonable reference for the design of HCCU.

YAN Jun;SU Qi;BU Yu-feng;LU Qing-zhen;YANG Zhi-xun

State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics,Dalian University of Technology, Dalian 116024, China;Ningbo Institube of Dalian University of Technology, Ningbo 315040, China;State Key Laboratory of Structural Analysis for Industrial Equipment, School of Ocean Science and Technology,Dalian University of Technology, Panjin 124221, China;Institute of marine machinery, College of Mechanical and Electrical, Engineering Harbin Engineering University,Harbin 150001, China

中国海洋工程（英文版）

[1]YAN Jun;SU Qi;BU Yu-feng;LU Qing-zhen;YANG Zhi-xun-.Study on the Nonlinear Tension?Torsion Coupled Stiffness of the High-Current Composite Umbilical Considering the Thermal Effect)[J].中国海洋工程（英文版）,2022(04):588-600

HCCU,spirally

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