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Numerical evaluation on fatigue crack growth and life predictions of an FPSO mooring system

Lookup NU author(s): Professor Zhiqiang Hu



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


This study aims to systematically study the fatigue crack propagation characteristics of the mooring system for afloating production storage and offloading vessel (FPSO) through the fracture mechanics-based approach. Theremaining fatigue life of the mooring lines is predicted by a self-integrated program through the simulation of thecrack growth behavior. Additionally, parametric studies are performed to investigate the influence of initialcrack status (location/size/shape) on mooring crack propagation characteristics. Results illustrate that theremaining fatigue life at the uppermost position of mooring lines at the wave-ward side is similar, which isapproximately 178 years longer than that of mooring lines at the wave-back side. Fatigue issues are the severestin the crown region, where the critical fatigue life is about 49% of that in the bend region and 19.9% of that inthe straight region. With the increase of the initial crack size and aspect ratio, the remaining fatigue life experiencesa remarkable decrease with amplitudes up to 47.8% and 30.1% respectively. The integrated evaluationprogram is a promising tool for the damage tolerance design of mooring system due to the excellent capability inpredicting the remaining fatigue life and charactering the crack growth behavior.

Publication metadata

Author(s): He W, Gao S, Hu Z, Xie D, Zhang Z, Wang C

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2022

Volume: 265

Print publication date: 01/12/2022

Online publication date: 21/09/2022

Acceptance date: 03/09/2022

Date deposited: 23/09/2022

ISSN (print): 0029-8018

ISSN (electronic): 1873-5258

Publisher: Elsevier Ltd


DOI: 10.1016/j.oceaneng.2022.112501

ePrints DOI: 10.57711/xg3e-ds47


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Funder referenceFunder name
China Postdoctoral Science Foundation
National Natural Science Foundation of China