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Research Papers: Offshore Technology

A Finite Element Model for Prediction of the Bending Stress of Umbilicals

[+] Author and Article Information
Qingzhen Lu

School of Ocean Science and Technology,
Dalian University of Technology,
2 Dagong Road,
Panjin 124221, China
e-mail: luqingzhen@dlut.edu.cn

Zhixun Yang

Department of Engineering Mechanics,
Dalian University of Technology,
2 Linggong Road,
Dalian 116024, China
e-mail: yangzhixun@mail.dlut.edu.cn

Jun Yan

Department of Engineering Mechanics,
Dalian University of Technology,
2 Linggong Road,
Dalian 116024, China
e-mail: yanjun@dlut.edu.cn

Hailong Lu

Ocean Engineering Program,
Federal University of Rio de Janeiro,
Rio de Janeiro 22290-240, Brazil
e-mail: jlluhailong8976@gmail.com

Jinlong Chen

Department of Engineering Mechanics,
Dalian University of Technology,
2 Linggong Road,
Dalian 116024, China
e-mail: cjldut@163.com

Qianjin Yue

School of Ocean Science and Technology,
Dalian University of Technology,
2 Dagong Road,
Panjin 124221, China
e-mail: yueqj@dlut.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 14, 2017; final manuscript received May 27, 2017; published online July 6, 2017. Assoc. Editor: Theodoro Antoun Netto.

J. Offshore Mech. Arct. Eng 139(6), 061302 (Jul 06, 2017) (8 pages) Paper No: OMAE-17-1009; doi: 10.1115/1.4037065 History: Received January 14, 2017; Revised May 27, 2017

Umbilical is an important equipment in the subsea production to supply a connection between the floater and the subsea well. Analyzing strength and fatigue behaviors under bending is a key requirement to assure safety. An analytical model is proposed for predicting the bending behavior of a steel tube wounded helically around a frictionless cylinder. A full three-dimensional (3D) finite element (FE) model of an umbilical is developed by considering the frictions and contacts among its components. The numerical results of the bending stress of a steel tube were validated against that of the analytical model. The impacts of friction coefficients on the bending stress, contact pressure, and friction stress have been further investigated by the established FE model.

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References

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Figures

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Fig. 1

Schematic of steel tube geometry on a cylinder

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Fig. 2

Local coordinate system of cross section of steel tube

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Fig. 3

Layout of the cross section of a steel tube umbilical

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Fig. 4

FE model of the umbilical

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Fig. 5

Bending moment change with curvature under numerical simulation and experiment

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Fig. 6

Bending deformation and stress distribution of the umbilical

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Fig. 7

Comparison of results along the external surface of the steel tube

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Fig. 8

Three selected points of the steel tube in the red circle

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Fig. 9

Von Mises stress of A point under different friction coefficients

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Fig. 10

Von Mises stress of B point under different friction coefficients

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Fig. 11

Von Mises stress of C point under different friction coefficients

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Fig. 12

Contact pressure of A point under different friction coefficients

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Fig. 13

Contact pressure of B point under different friction coefficients

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Fig. 14

Contact pressure of C point under different friction coefficients

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Fig. 15

Friction stress of A point under different friction coefficients

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Fig. 16

Friction stress of B point under different friction coefficients

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Fig. 17

Friction stress of C point under different friction coefficients

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