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Direct calculation of fatigue damage of ship structure details

Zhiyuan Li (Institutionen för sjöfart och marin teknik, Fartygsdesign) ; Jonas Ringsberg (Institutionen för sjöfart och marin teknik, Fartygsdesign)
Proceedings of the ASME Thirtieth International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2011) in Rotterdam, the Netherlands, June 19-24, 2011 Vol. 2 (2011), p. 551-558 (OMAE2011-49758).
[Konferensbidrag, refereegranskat]

Fatigue assessment of ships using the direct calculation approach has been investigated by numerous researchers. Normally, this approach is carried out as either a global model analysis, or as a local model structural analysis. The current investigation presents a case study of a container vessel where the global and local analyses procedures are combined. A nonlinear time-domain hydrodynamic analysis followed by a global FE analysis is employed to screen for the most severe locations of the global ship’s hull with regard to fatigue damage. Once these locations have been identified, a sub-modelling technique is employed to transfer global loads from the global FE model to local FE models that have high resolution of elements for local structure details. Results from a selection of local FE model simulations are presented. Stress concentration factors at four critical locations are calculated and compared with values recommended by classification guidelines. Results are presented from a short-term fatigue analysis which has been carried out using the rainflow counting method. Finally, a long-term fatigue analysis is performed in time-domain using a designed wave scatter diagram of representative sea states.

Nyckelord: Container ship, direct calculation, fatigue, nonlinear wave loads, stress concentration factor, time-domain method

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Denna post skapades 2011-06-19. Senast ändrad 2012-02-16.
CPL Pubid: 141953


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Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Fartygsdesign (2007-2011)


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Innovation och entreprenörskap (nyttiggörande)
Övrig teknisk mekanik

Chalmers infrastruktur