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

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 ar...

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Bibliographic Details
Published in:Volume 3: Structures, Safety and Reliability
Main Authors: Gracia, Luis De, Osawa, Naoki, Mao, Wengang, Ichihashi, Daichi
Language:unknown
Published: 2016
Subjects:
Applied Mechanics
Marine Engineering
spatio-temporal model
wave direction
fatigue
crack propagation
storm model
crack propagation retardation
plasticity induced crack closure
Chalmers
North Atlantic
Online Access:https://doi.org/10.1115/OMAE2016-54688
https://research.chalmers.se/en/publication/245851
Description
Summary: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.

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