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An analytical method for predicting bi-directional torsional stiffness of unbonded flexible pipes
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Shang-hua WU1, Zhuo-yuan SHEN1, Zhi-xun YANG2, Yuan-chao YIN1, Jun-yu LIU1
Journal of Ship Mechanics | 2025, 29(9) : 1444 - 1453
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Journal of Ship Mechanics | 2025, 29(9): 1444-1453
• Structural Mechanics •
An analytical method for predicting bi-directional torsional stiffness of unbonded flexible pipes
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Shang-hua WU1, Zhuo-yuan SHEN1, Zhi-xun YANG2, Yuan-chao YIN1, Jun-yu LIU1
Affiliations
  • 1.School of Chemical Engineering, Ocean and Life Sciences, Dalian University of Technology, Panjin 124221, China
  • 2.College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
Published: 2025-09-20 doi: 10.3969/j.issn.1007-7294.2025.09.010
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An analytical model of pipe torsional stiffness in clockwise and counterclockwise directions is derived based on the helical winding structural characteristics of steel wires in the unbonded flexible pipe armour layers considering radial contraction and expansion phenomena. Taking a typical unbonded flexible pipe as an example, the bi-directional torsional stiffness analysis is conducted. The results show that the analytical model has a close match with the results of existing numerical model. It can be found that the error is 3.5% in clockwise torsion, and the error in counterclockwise torsion is 4.6%. This paper can provide a useful reference for the design and analysis of the torsional performance of flexible pipes.

flexible pipes  /  torsional stiffness  /  radial expansion  /  radial contraction  /  analytical model
Shang-hua WU, Zhuo-yuan SHEN, Zhi-xun YANG, Yuan-chao YIN, Jun-yu LIU. An analytical method for predicting bi-directional torsional stiffness of unbonded flexible pipes[J]. Journal of Ship Mechanics, 2025 , 29 (9) : 1444 -1453 . DOI: 10.3969/j.issn.1007-7294.2025.09.010
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Year 2025 volume 29 Issue 9
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Article Info
doi: 10.3969/j.issn.1007-7294.2025.09.010
  • Receive Date：2025-03-24
  • Online Date：2026-03-26
  • Published：2025-09-20
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  • Received：2025-03-24
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Affiliations
    1.School of Chemical Engineering, Ocean and Life Sciences, Dalian University of Technology, Panjin 124221, China
    2.College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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