Investigation on structural behavior of ring-stiffened composite offshore rubber hose under internal pressure. (October 2018)

• Record Type: Journal Article
• Authors: Gao, Qiang; Zhang, Peng; Duan, Menglan; Yang, Xueqi; Shi, Wenbin; An, Chen; Li, Zhongli
• Is Part Of: Applied ocean research. Volume 79(2018)
• Page Start: 7
• Page End: 19
• Publication Date: 2018-10
• Subjects: Stiffened composite rubber hose -- Single carcass -- Stiffener -- Rebar -- Failure pressure; Ocean engineering -- Periodicals; 620.416205
• DOI: 10.1016/j.apor.2018.07.007
• Languages: English
• ISSNs: 0141-1187

Abstract

Highlights: A nonlinear finite element model of ring-stiffened composite rubber hose is created and verified. Stresses of stiffener, radial and axial deformation and load in reinforcement cords are obtained. A bulging phenomenon causing load concentration between two adjacent stiffeners is found. Failure modes are recognized by failure criteria. The influence of different fibers and rubbers on failure modes are evaluated. Abstract: Ring-stiffened composite offshore rubber hose of single carcass is commonly used for offshore oil transfer. Common hose dimensions are length of 10.7 m and nominal diameter of 500 mm. The nominal burst pressure is 7.5 MPa, equal to five times rated working pressure of 1.5 MPa. The hose carcass is composite cylindrical tube made of rubber, reinforcing fiber cords and steel spiral stiffener that provides radial stiffness. In hose design, the burst pressure shall be determined to verify its pressure bearing capacity. In this paper, a nonlinear finite element hose model is created with commercial software ABAQUS and validated to predict its structural behavior under internal pressure. The large deformations, interactions between components and nonlinear material properties of hyperelastic rubber and fibers are considered. Stresses of stiffener, radial and axial deformation and load in reinforcement plies are obtained. A bulging phenomenon amid two stiffeners is found, which indicates the confine effect of stiffeners. Failure pressure is jointly determined by the strength limit of polymer cords and steel stiffener. The influence of different fibers and rubbers on hose pressure-deformation response are compared. The results demonstrate good accordance with requirement of specification. The finite element model can predict hose failure pressure and provide guidance for reliable hose design in practice.