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Analytical and Numerical Modeling for flexible pipes

China Ocean Engineering 2011年第4期25卷 737-746页

作者：王玮陈耕 College of Shipbuilding Engineering Harbin Engineering University

The unbonded flexible pipe of eight layers, in which all the layers except the carcass layer are assumed to have isotropic properties, has been analyzed. Specifically, the carcass layer shows the orthotropic characteristics. The effective elastic moduli of the carcass layer have been developed in terms of the influence of deformation to stiffness. With consideration of the effective elastic moduli, the structure can be properly analyzed. Also the relative movements of tendons and relative displacements of wires in helical armour layer have been investigated. A three-dimensional nonlinear finite element model has been presented to predict the response of flexible pipes under axial force and torque. Further, the friction and contact of interlayer have been considered. Comparison between the finite element model and experimental results obtained in literature has been given and discussed, which might provide practical and technical support for the application of unbonded flexible pipes.

关键词： unbonded flexible pipes effective elastic modulus isotropic orthotropic carcass layer helical layer

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An Analytical Approach for Assessing the Collapse Strength of an unbonded flexible Pipe

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Journal of Marine Science and Application 2015年第2期14卷 196-201页

作者： Y. G. Chen J. Liu L. F. Zhu Z. M. Tan G. Karabelas GE Oil & Gas Newcastle Upon Tyne UK GE Oil & Gas Houston TX USA

This paper presents an analytical scheme for predicting the collapse strength of a flexible pipe, which considers the structural interaction between relevant layers. The analytical results were compared with a FEA model and a number of test data, and showed reasonably good agreement. The theoretical analysis showed that the pressure armor layer enhanced the strength of the carcass against buckling, though the barrier weakened this effect. The collapse strength of pipe was influenced by many factors such as the inner radius of the pipe, the thickness of the layers and the mechanical properties of the materials. For example, an increase in the thickness of the barrier will increase contact pressure and in turn reduce the critical pressure.

关键词： collapse strength prediction unbonded flexible pipes finite element simulations rough bore elastic collapse criticalpressure

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A Finite Element Model for the Instability Analysis of flexible pipes Tensile Armor Wires

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Journal of Mechanics Engineering and Automation 2017年第3期7卷 165-170页

作者： Gabriel Gonzalez Jose Renato Mendes de Sousa Luis Volnei Sudati Sagrilo Civil Engineering Program COPPE Federal University of Rio de Janeiro Rio de Janeiro 21941-596 Brazil

The instability of the tensile armor wire of flexible pipes is a failure mode associated with deep and ultra-deep water applications. Real compressive forces acting on the pipe are necessary to trigger this process. The loss of stability may be divided into two distinct processes, according to the main direction of the wire＇s displacement： radial or lateral instability. This study aims at proposing a numerical tool for predicting lateral and radial critical buckling loads for the tensile armor wires of flexible pipes. A simple finite element model, based on springs and beams elements, was developed in ABAQUS~ to deal with this problem in an efficient and reliable manner. A parametric study was conducted concerning the behavior of the critical load when the laying angle, the initial curvature and the total pipe length are varied. The results were consistent with previously published literature data and analytical expressions, proving its applicability to pipe engineering projects. It also has the advantage of approaching the problem three-dimensionally, which allows further modelling modifications, such as including friction effects.

关键词： unbonded flexible pipes instability finte element modeling.

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