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Study on the Nonlinear Tension—Torsion Coupled Stiffness of the High-Current Composite Umbilical Considering the Thermal Effect

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Abstract

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 composite 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.

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Correspondence to Zhi-xun Yang.

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Foundation item: This research was financially supported by the National Key R&D Program of China (Grant No. 2021YFA1003501), the National Natural Science Foundation of China (Grant Nos. U1906233 and 52001088), the Key R&D Program of Shandong Province (Grant No. 2019JZZY010801), and the Fundamental Research Funds for the Central Universities (Grant Nos. DUT20ZD213 and DUT20LAB308).

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Yan, J., Su, Q., Bu, Yf. et al. Study on the Nonlinear Tension—Torsion Coupled Stiffness of the High-Current Composite Umbilical Considering the Thermal Effect. China Ocean Eng 36, 588–600 (2022). https://doi.org/10.1007/s13344-022-0056-1

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  • DOI: https://doi.org/10.1007/s13344-022-0056-1

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