Browse > Article
http://dx.doi.org/10.7781/kjoss.2017.29.2.099

Bending Behavior of the Mooring Chain Links Subjected to High Tensile Forces  

Kim, Seungjun (Dept of Construction Safety and Disaster Prevention Engineering, Daejeon University)
Won, Deok-Hee (Coastal Development & Ocean Energy Research Division Korea Institute of Ocean Science and Technology)
Publication Information
Journal of Korean Society of Steel Construction / v.29, no.2, 2017 , pp. 99-110 More about this Journal
Abstract
This paper presents the study of the bending behavior of mooring chain links for keeping the position of the offshore floating structures. In general, chain links have been thought as the axial members due to the fundamental boundary condition. But, the flexural stiffness can be induced to the contact surface between chain links when friction occurs at the surface of the chain links due to high tensile force. Especially, the mooring chains for offshore floating platforms are highly tensioned. If the floater suffers rotational motion and the mooring chain links are highly tensioned, the rotation between contact links, induced by the floater rotation, generates the bending moment and relevant stresses due to the unexpected bending stiffness. In 2005, the mooring chain links for the Girassol Buoy Platform were failed after just 5 months after facility installation, and the accident investigation research concluded the chain failure was mainly caused by the fatigue due to the unexpected bending stress fluctuation. This study investigates the pattern of the induced bending stiffness and stresses of the highly tensioned chain links by nonlinear finite element analysis.
Keywords
Mooring chain; Friction; Stress concentration; Nonlinear finite element analysis; Fatigue;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 American Petroleum Institute (2005) Design and Analysis of Stationkeeping Systems for Floating Structures (API RP 2SK), API Publishing services, Washington DC, USA.
2 Det Norske Veritas (2010) Position Mooring (DNV-OSE301), DNV, Norway.
3 Det Norske Veritas (2008) Offshore Mooring Chain (DNV-OS-E302), DNV, Norway.
4 Americal Bureau of Shipping (2009) Guide for Certification of Offshore Mooring Chain, ABS, Houston, USA.
5 Bureau Veritas (2012) Classification of Mooring Systems for Permanent Offshore Units, Bureau Veritas, France.
6 Jean, P., Goessens, K., and L'Hostis, D. (2005) Failure of Chains by Bending on Deepwater Mooring Systems, Proceedings of 2005 Offshore Technology Conference, OTC 17238.
7 Cerkovnik, M., Chang, S.S., and Criffin, C. (2012) Fatigue Analysis of Tether Chain in Hybrid Risers, Proceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering, pp.799-807.
8 Bureau Veritas (2014) Fatigue of Top Chain of Mooring Lines Due to In-plane and Out-of-plane Bendings, Bureau Veritas, France.
9 Bastid, P. and Smith, S. (2013) Numerical Analysis of Contact Stresses between Mooring Chain Links and Potential Consequences for Fatigue Damage, Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013-11360).
10 Pacheno, P.M.C.L., Kenedi, P.P., and Jorge, J.C.F. (2002) Elastoplastic Analysis of the Residual Stress in Chain Links, Proceedings of the ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering, pp.39-46 (OMAE2002-28083).
11 Pacheno, P.M.C.L., Kenedi, P.P., Jorge, J.C.F., and Paiva, A.M.C (2003) Analysis of the Influence of Mechanical Properties on the Residual Stress in Offshore Chain Links Using the Finite Element Method, Proceedings of the ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering (OMAE2003-37205).
12 Pacheno, P.M.C.L., Kenedi, P.P., Jorge, J.C.F., Santos, H.G., Savi, M.A., and Paiva, A.M.C (2003) Modeling Residual Stresses in Offshore Chain Links Using Finite Element Method, Proceedings of 17th International Congress of Mechanical Engineering (COBEM2003-0320).
13 임유창, 김경수, 정준모, 강찬회(2010) 부유식 해양플랜트 계류 체인의 면외굽힘 거동에 대한 연구, 대한조선학회논문집, 대한조선학회, 제47권, 제4호, pp.580-588. Lim, Y.C., Kim, K.S., Choung, J.M., and Kang, C.H. (2010) A Study on Out-of-plane Bending Mechanism of Mooring Chains for Floating Offshore Plants, Journal of the Society of Naval Architects of Korea, SNAK, Vol.47, No.4, pp.580-588.   DOI
14 신태송(2006) STS 304 스체인리스강의 응력도-변형도 곡선에 관한 제안, 한국강구조학회 논문집, 한국강구조학회, 제18권, 제2호, pp. 271-278. Shin, T.S. (2006) A Proposal on the Stress-strain Curve of Stainless Steel STS304, Journal of Korean Society of Steel Construction, KSSC, Vol.28, No.4, pp.271-278.