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Influence of different wave load sequence models on fatigue life prediction of ship structures based on fracture mechanics approach

Luis De Gracia ; Naoki Osawa ; Wengang Mao (Institutionen för sjöfart och marin teknik, Marin teknik) ; Daichi Ichihashi
Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016) in Busan, Korea, June 19-24, 2016 Vol. 3 (2016),
[Konferensbidrag, refereegranskat]

FCP (Fatigue Crack Propagation) based fatigue assessments of a welded joint in a 2800 TEU container ship which sails on North Atlantic routes are performed. The Great-circle course with small variation of relative heading angle and a southerly course with large variation of relative heading angle are considered. Short sea sequences are generated by using ‘storm model’ developed by Osaka University and ‘spatio-temporal model’ developed by Chalmers University. Sea keeping analyses are performed for both cases wherein the variation in wave direction’s occurrence probability is considered (‘real headings model’) or not (‘all-headings model’). FCP analyses are performed considering plasticity-induced crack closure by using FASTRAN-II. Fatigue crack propagation lives and characteristics of crack propagation retardation due to excessive loads are compared. Based these results, the influence of the difference in load sequence model on FCP-based fatigue assessment result is discussed.

Nyckelord: fatigue, crack propagation, plasticity induced crack closure, spatio-temporal model, storm model, wave direction, crack propagation retardation.



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Denna post skapades 2016-12-05. Senast ändrad 2017-01-20.
CPL Pubid: 245851

 

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Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Marin teknik (2015-2017)

Ämnesområden

Energi
Transport
Hållbar utveckling
Fastkroppsmekanik
Marin teknik

Chalmers infrastruktur