Multi-scale analyses of a floating marine hose with hybrid polyaramid/polyamide reinforcement cords. (July 2018)

• Record Type: Journal Article
• Authors: Tonatto, Maikson L.P.; Tita, Volnei; Forte, Maria M.C.; Amico, Sandro C.
• Is Part Of: Marine structures. Volume 60(2018)
• Page Start: 279
• Page End: 292
• Publication Date: 2018-07
• Subjects: Floating hose -- Hose stiffness -- Finite element modeling -- Multi-scale analyses -- Aramid/polyamide cords; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2018.04.005
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: This study reports a multi-scale structural analyses of a mainline floating double carcass marine hose (nominal diameter 508 mm, length 10.7 m, design pressure 2.1 MPa, weight 4100 kg). A material change in the reinforcement cords of the traditional hose is proposed, from polyester and polyamide to hybrid aramid/polyamide cords, allowing an improvement in design, reducing weight and increasing flexibility. Two models have been developed to obtain the hose responses. Firstly, a finite element model of the traditional system was built to perform a macro-scale analysis of global hydrodynamics loads in the hose line using Orcaflex™ software. Then, a non-linear finite element model was developed for meso-scale analysis using Abaqus™ software. Rubber and cords were modeled using hyperelastic models, and axial, bending and torsional stiffnesses were evaluated. Experimental tests were carried out to assess the mechanical response of an actual full-scale hose. The reduced number of layers of the hose using hybrid cords, compared to the traditional one, allowed a reduction in weight of 15%, and brought also a decrease in specific axial, torsional and bending stiffnesses of 43.9%, 52.2% and 21.6%, respectively. The multi-scale analysis predicted well the structural response of the hose line, and the reduced potential failure may increase life-time of the structure. Highlights: A floating hose using hybrid aramid/polyamide reinforcement cords has been proposed. The hyperelastic effects are incorporated in a 3D meso-scale model to obtain a nonlinear structural response of the hose. The hydrodynamics loads have been considered in a macro-scale model to evaluate the hose line forces, using beam elements. The hybrid cords have demonstrated potential to reduced internal loads of the hose.