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Piper and Riser Technology

An Experimental and Numerical Study on the Axial Compression Response of Flexible Pipes

[+] Author and Article Information
José Renato M. de Sousa1

COPPE/UFRJ, Department of Civil Engineering, Centro de Tecnologia, Bloco I2000, Sala I116,  Cidade Universitária, Ilha do Fundão Rio de Janeiro, Brazil, CEP 21945-970jrenato@laceo.coppe.ufrj.br

Paula F. Viero, Carlos Magluta, Ney Roitman

COPPE/UFRJ, Department of Civil Engineering, Centro de Tecnologia, Bloco I2000, Sala I116,  Cidade Universitária, Ilha do Fundão Rio de Janeiro, Brazil, CEP 21945-970

1

Corresponding author.

J. Offshore Mech. Arct. Eng 134(3), 031703 (Feb 02, 2012) (12 pages) doi:10.1115/1.4005181 History: Received December 09, 2010; Revised July 26, 2011; Published February 02, 2012; Online February 02, 2012

This paper deals with a nonlinear three-dimensional finite element (FE) model capable of predicting the mechanical response of flexible pipes subjected to axisymmetric loads focusing on their axial compression response. Moreover, in order to validate this model, experimental tests are also described. In these tests, a typical 4 in. flexible pipe was subjected to axial compression until its failure is reached. Radial and axial displacements were measured and compared to the model predictions. The good agreement between all results points out that the proposed FE model is effective to estimate the response of flexible pipes to axial compression and; furthermore, has potential to be employed in the identification of the failure modes related to excessive axial compression as well as in the mechanical analysis of flexible pipes under other types of loads.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical unbounded flexible pipe

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Figure 2

Birdcaging (Bectarte and Coutarel [8])

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Figure 3

High strength tape

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Figure 4

Lateral buckling (Bectarte and Coutarel [8])

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Figure 5

View of the FE model

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Figure 6

Coordinate systems

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Figure 7

Axial compression imposed to the FE model (pipe free to axially translate and rotate)

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Figure 8

(a) Detail of the extremity of a sample of the high strength tape; (b) Sample ready to be tested

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Figure 9

Sequence of images of the high strength tape at different levels of loading: (a) 0 kN; (b) 10.0 kN; (c) 20.0 kN; (d) 22.5 kN; (e) 25.0 kN; (f) 26.8 kN; (g) to (i) after rupture

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Figure 10

Image processing sequence: (a) original image; (b) image after binarization; (c) removal of spurious points; (d) detail of the linear approximation

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Figure 11

Variation of the elongation per unit length in the high strength tape

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Figure 12

General overview of the experimental setup

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Figure 13

Electrical transducer at the extremity of the 4 in. flexible pipe

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Figure 14

Radial displacement measure: (a) clamp with the inductive sensors; (b) schematic view

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Figure 15

Inclinometer positioned at the extremitiy of the 4 in. flexible pipe

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Figure 16

Axial compression versus shortening per unit length at the extremity of the pipe

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Figure 17

Axial compression versus radial expansion in the middle section of the pipe

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Figure 18

Axial compression versus twist angle per unit length at the extremity of the pipe

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Figure 19

Birdcaging of sample 1

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Figure 20

Radial displacements, mm, along the flexible pipe for a compressive load of 290 kN (displacements magnified 5×)

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Figure 21

Compressive load versus equivalent (Von Mises) stress ratios in the outer plastic and the reinforcement tape of the 4 in. flexible pipe

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Figure 22

Compressive load versus normal stress ratios in the wires of the inner and outer tensile armors of the 4 in. flexible pipe

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Figure 23

Compressive load versus bending normal stress ratios in the wires of the inner and outer tensile armors of the 4 in. flexible pipe

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Figure 24

Compressive load versus twist moments in the wires of the inner and outer tensile armors of the 4 in. flexible pipe

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Figure 25

Compressive load versus nondimensional gap between the inner tensile armor and the pressure armor

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