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Indexed by:Journal Papers

Date of Publication:2015-07-01

Journal:MARINE STRUCTURES

Included Journals:SCIE、EI、Scopus

Volume:42

Page Number:154-174

ISSN No.:0951-8339

Key Words:Unbonded flexible pipe; Bending behavior; Tangential compliance; Shear deformation

Abstract:Rigorous analytical formulations are given to describe the gross slip initiation and progression in tensile armor layers of unbonded flexible pipes. Then two mechanisms are thought to contribute to the decrease of layer stiffness before gross slip begins. The first one considers the micro-slip occurred at the interlayer contact interfaces. The relative displacement between an armor wire and the underlying layer is determined according to the theory of contact mechanics. Shear deformations of the supporting plastic layer are taken into account in the other mechanism where plane sections no longer remain plane. The results of bending moment-curvature relationship from the presented models are compared with the available test data and good correlations are found. The shear model is seen to describe the slip transition better than other models do. (C) 2015 Elsevier Ltd. All rights reserved.