NDLI: Enhanced multi-layer fatigue-analysis approach for unbonded flexible risers

Content Provider	Springer Nature Link
Author	Yang, He zhen Jiang, Hao Yang, Qi
Copyright Year	2014
Abstract	This paper proposes an enhanced approach for evaluating the fatigue life of each metallic layer of unbonded flexible risers. Owing to the complex structure of unbonded flexible risers and the nonlinearity of the system, particularly in the critical touchdown zone, the traditional method is insufficient for accurately evaluating the fatigue life of these risers. The main challenge lies in the transposition from global to local analyses, which is a key stage for the fatigue analysis of flexible pipes owing to their complex structure. The new enhanced approach derives a multi-layer stress-decomposition method to meet this challenge. In this study, a numerical model validated experimentally is used to demonstrate the accuracy of the stress-decomposition method. And a numerical case is studied to validate the proposed approach. The results demonstrate that the multi-layer stress-decomposition method is accurate, and the fatigue lives of the metallic layers predicted by the enhanced multi-layer analysis approach are rational. The proposed fatigue-analysis approach provides a practical and reasonable method for predicting fatigue life in the design of unbonded flexible risers.
Starting Page	363
Ending Page	379
Page Count	17
File Format	PDF
ISSN	08905487
Journal	China Ocean Engineering
Volume Number	28
Issue Number	3
e-ISSN	21918945
Language	English
Publisher	Chinese Ocean Engineering Society
Publisher Date	2014-06-10
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	unbonded flexible riser dynamic analysis fatigue finite element method Offshore Engineering Oceanography Coastal Sciences Fluid- and Aerodynamics Marine & Freshwater Sciences Numerical and Computational Physics
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering Renewable Energy, Sustainability and the Environment Mechanical Engineering

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