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Technical Briefs

Multiaxial Fatigue Analysis on Reeled Steel Tube Umbilical

[+] Author and Article Information
Hezhen Yang

e-mail: yanghz@sjtu.edu.cn,
yanghezhen@hotmail.com

Qingquan Li

State Key Laboratory of Ocean Engineering,
School of Naval Architecture,
Ocean and Civil Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Huajun Li

College of Engineering,
Ocean University of China,
Qingdao 266100, China

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 March 2, 2011; final manuscript received March 29, 2012; published online February 22, 2013. Assoc. Editor: Pingsha Dong.

J. Offshore Mech. Arct. Eng 135(1), 014501 (Feb 22, 2013) (6 pages) Paper No: OMAE-11-1024; doi: 10.1115/1.4007047 History: Received March 02, 2011; Revised March 29, 2012

Multiaxial fatigue analysis on reeled steel tube umbilical is proposed based on finite element analysis (FEA) results. Due to the complexity of the umbilical geometry, the stresses and strains field becomes multiaxial, worsening the fatigue resistance. The reel-lay method is one of the most efficient and cost-effective methods of umbilical installation. However, if installed by the reel-lay method, material properties of the umbilical change may have an influence in fatigue performance of the line. Finite element analysis is applied with contact formulation, and the load history through the reel, aligner, and straightener is simulated. The strain history of the whole modeling process in the critical element is given, and the properties' change after the load history is discussed. Then, the principal stress criterion and the Brown–Miller criterion (both combined with the critical plane approach) based on FEA results are used to do fatigue life prediction of reeled and nonreeled models. The results indicated that a reel-lay method has a great influence on the fatigue life of steel tube umbilical, so the influence of installation on the steel tube umbilical fatigue must be considered when the reel-lay method is adopted.

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References

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Figures

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Fig. 1

Stress condition of plane

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Fig. 3

Pipe outer fiber moment versus curvature: (a) Schematic history during reeling-lay installation and (b) schematic history on reeling simulation machines

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Fig. 4

Numerical model cross section

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Fig. 5

Axial stress distribution of the umbilical on the reel

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Fig. 6

Equivalent stress distribution of the umbilical on the reel

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Fig. 7

Axial strain history of point A during reeling process

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Fig. 8

Equivalent stress history of points B and C during the reeling process

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Fig. 9

Fatigue life distribution of the centrical tube in case 4

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Fig. 10

Fatigue life distribution of the centrical tube in case 3

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Fig. 11

Fatigue life distribution of the critical cross section in case 3

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Fig. 12

Fatigue life distribution of the critical cross section in case 4

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Fig. 13

Fatigue life distribution of the helical tube in case 8

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