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http://dx.doi.org/10.26748/KSOE.2017.08.31.4.299

Nonlinear Finite Element Analysis for Mooring Chain Considering OPB/IPB  

Kim, Min-suk (Department of Naval Architecture and Ocean Engineering, Inha University)
Kim, Yooil (Department of Naval Architecture and Ocean Engineering, Inha University)
Publication Information
Journal of Ocean Engineering and Technology / v.31, no.4, 2017 , pp. 299-307 More about this Journal
Abstract
The design of the mooring line to maintain the position of an offshore structure in rough marine environments is recognized as a very important consideration. Conventional fatigue evaluation of a mooring line was performed by considering the tensile force acting on the mooring line, but the mooring line broke after 238 days in the girassol area even though the expected fatigue life was expected to be longer. The causes of this event are known to be due to OPB/IPB (out-of-plane bending/in-plane bending) caused by chain link friction due to the excessive tensile strength of the mooring line. In this study, three models with different boundary conditions were proposed for fatigue analysis of a mooring line considering OPB/IPB. Interlink stiffness was calculated by nonlinear structure analysis and a stress concentration factor was derived. In addition, the sensitivity of interlink stiffness according to the magnitude of tensile force, large deformation effect, and coefficient of friction was analyzed, and the effect of critical elastic slip and bending moment calculation position on interlink stiffness was confirmed.
Keywords
Out-of-plane bending; In-plane bending; Interlink stiffness; Stress concentration factor; Critical elastic slip;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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