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Fatigue Assessment of Welded Ship Structures
Petershagen, H. Computational Structural Engineering Institute of 1997 전산구조공학 Vol.10 No.3
Modern ocean-going vessels are highly dynamically loaded all-welded structures. Traditionally, this fact has been taken into account in the design of ship structures by keeping the overall stress level within permissible limits and by limiting notch effects in the design of local structures. With an improving knowledge of loads and the rapid development of calculation means more detailed calculation-based methods are increasingly introduced. A brief review on fatigue assessment methods used in the design of ship structures has been given during the 1993 IIW International Conference in Glasgow. The rapid development during recent years underlines the importace of the subject and justifies its extended discussion in this paper.
Repair of Offshore Structures by Underwater Wet Welding Design and Fatigue Assessment
Krohn, A.,Petershagen, H.,Pohl, R.,Szelagowski, P.,Lafaye, G The Society of Naval Architects of Korea 1997 Journal of ship and ocean technology Vol.1 No.1
Under water wet welding is an economically alternative for the repair of offshore structures. In this paper investigations on the fatigue strength of a wet welded pipe structural member have been reported. For the connection a special sleeve patch design has been developed. The joint was fatigue tested. The evaluation of the test was carried out by means of the hot-spot approach with regard to several extrapolation rules of the hot-spot stress. Obtained results have been compared to actual classfication rules and recommendations.
A New Concept of Energy Absorbing System for the Double Hull Tanker
Lee, J. W.,Petershagen, H.,Rorup, J.,Kim, J. Y.,Yoon, J. H. The Society of Naval Architects of Korea 1999 Journal of ship and ocean technology Vol.3 No.1
A new concept of collision energy absorbing system for ;he New Oil-tankers with Advanced Double Hull Structure(NOAHS and NOAHS II) are presented through the joint-research pro-gran between Inha and Hamburg-Harburg University. A comparative study on col vision resistance of these proposed side structures with standard double hull structure of 310K DWT class VLCC, is carried out. The fatigue investigation of structural detail parts is also included. It contains a comparative fatigue study based on pertinent regulations of Classification Societies.