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Mooring system fatigue analysis for a semi-submersible

Mooring system fatigue analysis for a semi-submersible
Mooring system fatigue analysis for a semi-submersible

T-N curves, S-N curves, and fracture mechanics (FM) based mooring system fatigue analyses for a semi-submersible are presented. Stress ranges are calculated based on the tension ranges of mooring lines subjected to the combined loading process induced by the motions of wave frequency (WF) and low frequency (LF). A comparison between T-N curves, S-N curves, and FM based mooring fatigue analyses for the semi-submersible is made and the results show that the fatigue lives predicted by the three approaches are in general comparable if the safety factors suggested by API and DNVGL are considered in the T-N and S-N curves based approaches. In addition, the crown section of a mooring chain is prone to fatigue damage compared to bend and weld sections without considering the SCF. A parametric study to investigate the impact of initial crack shape, critical crack depth, and initial crack sizes on fatigue life of a mooring chain is also conducted and the results show that fatigue life of a mooring chain predicted by the FM approach is generally sensitive to initial crack shape and initial crack sizes, however, it is relatively insensitive to the critical crack depth.

Fatigue assessment, Fracture mechanics (FM), S-N curves, Semi-submersible, T-N curves
0029-8018
550-563
Xue, Xutian
b2b5233a-132a-46b8-9b4c-5763a21f9929
Chen, Nian Zhong
4c5273cb-1645-446e-8bc4-b9d513e321b9
Wu, Yongyan
5feb90ab-343f-4360-9ad2-5c7511abe112
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Guo, Yunhua
6f81f9b1-e881-4719-9acc-e9409191cd55
Xue, Xutian
b2b5233a-132a-46b8-9b4c-5763a21f9929
Chen, Nian Zhong
4c5273cb-1645-446e-8bc4-b9d513e321b9
Wu, Yongyan
5feb90ab-343f-4360-9ad2-5c7511abe112
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Guo, Yunhua
6f81f9b1-e881-4719-9acc-e9409191cd55

Xue, Xutian, Chen, Nian Zhong, Wu, Yongyan, Xiong, Yeping and Guo, Yunhua (2018) Mooring system fatigue analysis for a semi-submersible. Ocean Engineering, 156, 550-563. (doi:10.1016/j.oceaneng.2018.03.022).

Record type: Article

Abstract

T-N curves, S-N curves, and fracture mechanics (FM) based mooring system fatigue analyses for a semi-submersible are presented. Stress ranges are calculated based on the tension ranges of mooring lines subjected to the combined loading process induced by the motions of wave frequency (WF) and low frequency (LF). A comparison between T-N curves, S-N curves, and FM based mooring fatigue analyses for the semi-submersible is made and the results show that the fatigue lives predicted by the three approaches are in general comparable if the safety factors suggested by API and DNVGL are considered in the T-N and S-N curves based approaches. In addition, the crown section of a mooring chain is prone to fatigue damage compared to bend and weld sections without considering the SCF. A parametric study to investigate the impact of initial crack shape, critical crack depth, and initial crack sizes on fatigue life of a mooring chain is also conducted and the results show that fatigue life of a mooring chain predicted by the FM approach is generally sensitive to initial crack shape and initial crack sizes, however, it is relatively insensitive to the critical crack depth.

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Ocean Eng_final manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 6 March 2018
e-pub ahead of print date: 17 March 2018
Published date: 15 May 2018
Keywords: Fatigue assessment, Fracture mechanics (FM), S-N curves, Semi-submersible, T-N curves

Identifiers

Local EPrints ID: 419455
URI: http://eprints.soton.ac.uk/id/eprint/419455
ISSN: 0029-8018
PURE UUID: ec88a668-e469-46be-81e6-70c9eb585106
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

Catalogue record

Date deposited: 12 Apr 2018 16:30
Last modified: 07 Oct 2020 06:32

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