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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: | 2021-11-02 |
| Downloads: | 19 View Download Statistics |
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