Research Papers: Structures and Safety Reliability

An Analytical Structural Strain Method for Steel Umbilical in Low Cycle Fatigue

[+] Author and Article Information
Wei Wang

College of Shipbuilding Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: mimal@126.com

Xianjun Pei

Department of Naval Architecture
and Marine Engineering,
University of Michigan,
Ann Arbor, MI 48109
e-mail: xpei@umich.edu

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 April 9, 2018; final manuscript received June 26, 2018; published online August 13, 2018. Assoc. Editor: Jonas W. Ringsberg.

J. Offshore Mech. Arct. Eng 141(1), 011605 (Aug 13, 2018) (8 pages) Paper No: OMAE-18-1037; doi: 10.1115/1.4040721 History: Received April 09, 2018; Revised June 26, 2018

Pipes, especially risers, pipelines, and umbilicals, are extensively used in the subsea production system. Umbilical, as a controlling component of subsea production system, as well as other pipes, will resist reeling, unreeling, and additional processing before on-site installation, which might lead to yielding and plastic deformation of the pipe. This plastic deformation often results in low cycle fatigue (LCF) issue of the pipes, and how to effectively estimate the corresponding fatigue life has become a topic of practical engineering interest. In the present paper, a structural strain method is applied to determine the elastic core of the pipe and to calculate the pseudo structural stress. The pseudo structural stress concept has been applied to analyze the pipe in LCF regime. Further, the results obtained have been compared with the experimental and other available data. It can be seen that the results coincide well with the experimental data. In addition to the demonstrated effectiveness, the key advantage of this pseudo structural stress approach is the simplicity in dealing with girth-welded pipe sections, since finite element stress analysis is unnecessary.

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Fig. 1

Summary of the new approach to obtain pseudo structural stress

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Fig. 2

Schematic representation of mechanical response of one-dimensional rate independent perfect plasticity model

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Fig. 3

Upper-side pipe yields

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Fig. 4

Lower-side pipe yields

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Fig. 5

Two-side yields conditions

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Fig. 6

Normalized force-moment of one-side yields

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Fig. 7

Stress distribution through cross section for two-side yield condition

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Fig. 8

Six kinds of two-side yield

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Fig. 9

Normalized force and moment in one- and two-side yield

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Fig. 10

The relationship of c and e in two-side yield

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Fig. 11

Girth butt weld test specimen for LCF test

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Fig. 12

(a) Beam element model representing a pipe section and (b) load-deflection curve for specimen G2 with calibrate equivalent yield strength

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Fig. 13

Actual stress with other fatigue data

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Fig. 14

Stress calculated from elastic core method with other fatigue data



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