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

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conference contribution
posted on 2023-05-23, 14:16 authored by Magoga, T, Roberto Ojeda RabanalRoberto Ojeda Rabanal, Stuart CannonStuart Cannon, Thomas, G
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.


Publication title

Structural Integrity Procedia


J Correia






Australian Maritime College



Place of publication


Event title

First International Symposium on Risk Analysis and Safety of Complex Structures and Components

Event Venue

Porto, Portugal

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright 2019 The Authors CC BY-NC-ND

Repository Status

  • Open

Socio-economic Objectives

Maritime; Expanding knowledge in engineering