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Interdependencies between variables in fatigue analysis of a weight-optimised naval ship

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Magoga, TF ORCID: 0000-0003-1636-264X, Ojeda, R ORCID: 0000-0002-2421-0032, Cannon, S and Thomas, G 2019 , 'Interdependencies between variables in fatigue analysis of a weight-optimised naval ship', in J Correia (ed.), Structural Integrity Procedia , Elsevier, Netherlands, pp. 1-8 .

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Abstract

Modern warships are often constructed from aluminium alloys or high tensile steel, and their increasing range of roles indicatesexposure to harsh seaway loads including slamming. These factors can lead to fatigue cracking, which can reduce operationalavailability. The objective of the present study is to improve understanding of the influence of variables in the fatigue analysis ofa weight-optimised warship. The objective is met by analysing hull monitoring data acquired from a 56 m naval aluminium patrolboat, to determine the long-term importance of slamming and the correlation between the hourly number of slams, ship speed,significant stress, and fatigue damage at two structural details. It was found that the effect of the ship’s speed on the fatiguedamage is not statistically significant, which differs from the results of a numerical fatigue analysis based on the patrol boat’slong-term speed profile. In addition, a sizable proportion of the fatigue damage accumulated when the patrol boat experiencedslamming at low to moderate ship speed. As such, it is suggested that the use of long-term distributions of the significant waveheight and wave period as well as ship speed may mask voluntary and/or involuntary speed reduction, which affects theprobability of the ship experiencing slamming and in turn the fatigue damage. This finding can lead to improved requirementssetting and through-life structural management of weight-optimised warships.

Item Type: Conference Publication
Authors/Creators:Magoga, TF and Ojeda, R and Cannon, S and Thomas, G
Keywords: fatigue life, naval ships, hull monitoring slamming
Journal or Publication Title: Structural Integrity Procedia
Publisher: Elsevier
ISSN: 2452-3216
Copyright Information:

Copyright 2019 The Authors CC BY-NC-ND

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