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<p>As offshore oil and gas exploration advances into deeper waters, double carcass hoses (DCHs) are subjected to increasingly complex combined loading conditions, necessitating enhanced reliability and durability in extreme environments. This paper presents a theoretical analysis methodology for evaluating the stress and deformation of DCHs under concurrent internal pressure and axial tensile forces. The approach, based on the laminated plate theory and Mooney-Rivlin model, incorporates the nonlinear characteristics of the rubber matrix and geometric nonlinearity within reinforcement layers. Through iterative loading processes, material parameters and reinforcement layer winding angles are systematically updated. The failure criteria are established using the maximum tensile strength of the cord and Von Mises criterion for helical steel wires. The model’s validity was verified through axial tensile tests on a DCH with a 500 mm inner diameter. The analysis reveals distinct variations in load-bearing contributions between helical steel wire and cord layers at different internal pressure levels. The hose demonstrates complex nonlinear behavior under combined loading conditions. Comprehensive sensitivity analyses examined the influence of critical parameters, including cord winding angle, layer count, hose diameter, helical steel wire pitch, and wire diameter, on hose failure characteristics. A failure envelope for DCHs under various parameter conditions was developed, providing a theoretical framework for optimizing DCH structural design.</p>

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Theoretical Investigation of Double Carcass Hoses Under Combined Internal Pressure and Axial Loading

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Song-lin Gao,
  • Chen An,
  • Dai-feng Wei,
  • Jian Tan,
  • Ren-jie Yang,
  • Segen F. Estefen

摘要

As offshore oil and gas exploration advances into deeper waters, double carcass hoses (DCHs) are subjected to increasingly complex combined loading conditions, necessitating enhanced reliability and durability in extreme environments. This paper presents a theoretical analysis methodology for evaluating the stress and deformation of DCHs under concurrent internal pressure and axial tensile forces. The approach, based on the laminated plate theory and Mooney-Rivlin model, incorporates the nonlinear characteristics of the rubber matrix and geometric nonlinearity within reinforcement layers. Through iterative loading processes, material parameters and reinforcement layer winding angles are systematically updated. The failure criteria are established using the maximum tensile strength of the cord and Von Mises criterion for helical steel wires. The model’s validity was verified through axial tensile tests on a DCH with a 500 mm inner diameter. The analysis reveals distinct variations in load-bearing contributions between helical steel wire and cord layers at different internal pressure levels. The hose demonstrates complex nonlinear behavior under combined loading conditions. Comprehensive sensitivity analyses examined the influence of critical parameters, including cord winding angle, layer count, hose diameter, helical steel wire pitch, and wire diameter, on hose failure characteristics. A failure envelope for DCHs under various parameter conditions was developed, providing a theoretical framework for optimizing DCH structural design.