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

Citation

Magoga, T and Ojeda, R and Cannon, S and Thomas, G, Interdependencies between variables in fatigue analysis of a weight-optimised naval ship, Structural Integrity Procedia, 1-2 July 2019, Porto, Portugal, pp. 1-8. ISSN 2452-3216 (2019) [Refereed Conference Paper]


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Copyright Statement

Copyright 2019 The Authors CC BY-NC-ND

Abstract

Modern warships are often constructed from aluminium alloys or high tensile steel, and their increasing range of roles indicates exposure to harsh seaway loads including slamming. These factors can lead to fatigue cracking, which can reduce operational availability. The objective of the present study is to improve understanding of the influence of variables in the fatigue analysis of a weight-optimised warship. The objective is met by analysing hull monitoring data acquired from a 56 m naval aluminium patrol boat, 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 fatigue damage is not statistically significant, which differs from the results of a numerical fatigue analysis based on the patrol boat’s long-term speed profile. In addition, a sizable proportion of the fatigue damage accumulated when the patrol boat experienced slamming at low to moderate ship speed. As such, it is suggested that the use of long-term distributions of the significant wave height and wave period as well as ship speed may mask voluntary and/or involuntary speed reduction, which affects the probability of the ship experiencing slamming and in turn the fatigue damage. This finding can lead to improved requirements setting and through-life structural management of weight-optimised warships.

Item Details

Item Type:Refereed Conference Paper
Keywords:fatigue life, naval ships, hull monitoring slamming
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Defence
Objective Group:Defence
Objective Field:Maritime
UTAS Author:Magoga, T (Ms Teresa Magoga)
UTAS Author:Ojeda, R (Dr Roberto Ojeda Rabanal)
UTAS Author:Cannon, S (Dr Stuart Cannon)
ID Code:135328
Year Published:2019
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2019-10-14
Last Modified:2020-03-03
Downloads:5 View Download Statistics

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