Theoretical investigation on ultimate bearing capacity of offshore floating hoses under internal pressure

Abstract

Floating hoses are critical components in offshore oil and gas transportation systems, engineered to withstand various loads such as internal pressure, tension, torsion, and bending. In this study, an anisotropic constitutive model for cord-rubber and helix wire-rubber composite materials was proposed based on the Mooney–Rivlin hyperelastic formulation, taking into account the nonlinear mechanical behavior of rubber. Linear systems of equations describing the displacement and stress fields within the composite layers were established, incorporating unknown integration constants. The accuracy of the proposed theoretical model was validated through full-scale burst tests. Furthermore, the mechanical behavior of the hose under a design pressure of 10 MPa—five times the rated working pressure—was analyzed. Parametric studies were conducted to examine the effects of key structural parameters, including the cord winding angle, number of cord layers, helix wire diameter, pitch, and hose inner diameter, on the ultimate internal pressure and axial stiffness. The findings provide valuable technical guidance for the structural optimization and performance improvement of offshore floating rubber hoses.