Scantling Optimization of Ship Structures Considering Fatigue at the Early Design Stage

Amrane, Amirouche; Rigo, Philippe

Reference : Scantling Optimization of Ship Structures Considering Fatigue at the Early Design Stage


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Civil engineering
	To cite this reference:	http://hdl.handle.net/2268/126468

Title :	Scantling Optimization of Ship Structures Considering Fatigue at the Early Design Stage
Language :	English
Author, co-author :	Amrane, Amirouche [Université de Liège - ULiège > Département Argenco : Secteur TLU+C > ANAST (Systèmes de transport et constructions navales) >]
	Rigo, Philippe [Université de Liège - ULiège > Département ArGEnCo > Constructions hydrauliques et navales >]
Publication date :	Mar-2011
Main document title :	Advances in Marine Structures - Proceedings of the 3rd International Conference on Marine Structures, MARSTRUCT 2011
Pages :	925-944
Peer reviewed :	Yes
Audience :	International
ISBN :	978-041567771-4
Event name :	Marstruct
Event date :	2011
Event organizer :	Advances in Marine Structures - Proceedings of the 3rd International Conference on Marine Structures, MARSTRUCT 2011
Event place (city) :	Hamburg
Event country :	Germany
Keywords :	[en] Fatigue ; Scantling Optimization ; Multi-criteria Optimization
Abstract :	[en] ABSTRACT: Fatigue aspects are leading criterion for the scantling optimization of ships structures. LBR-5 software is an integrated package which performs, at the early design stage, cost and/or weight optimization of ships structures (scantling). This software takes into account structural constraints (yielding, buckling, displacement, ultimate strength). Until now, the fatigue failure issue was not implicitly included in the optimization loop. At the early design stage, limited information and details are available. Therefore simplified methods have to be applied. LBR-5 software provides the nominal stress, so chosen procedure uses the nominal stress and the Miner’s rule. This approach requires a library of stress concentration factors for predefined typical structural details. The goal of the present work is to develop a tool for fatigue assessment that can be integrated on LBR5 optimization process, to realize global optimization taking into account the fatigue issues. Until now, the integration of the fatigue tool is not finished. Only fatigue verification on the optimized structure is possible. On the present paper, the procedure adopted is presented and a longitudinal scantling of the mid-ship section of a LNG is optimized with LBR-5. Production cost is considered as objective functions. The optimized scantling is checked by the fatigue tool. The fatigue criterion is not respected on some panels. Corrections are performed on these panels to have an optimized scantling without fatigue problems.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/126468

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Open access	V2-marstruct2010 Fatigue Amirouche_final.pdf		Publisher postprint	381.26 kB	View/Open

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