dc.contributor.advisor |
Battley, M |
en |
dc.contributor.author |
Allen, Thomas |
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dc.date.accessioned |
2013-12-01T20:58:53Z |
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dc.date.issued |
2013 |
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dc.identifier.uri |
http://hdl.handle.net/2292/21184 |
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dc.description.abstract |
Dynamic impacts between a marine craft’s hull and the water surface is one of the critical load cases considered for hull structural requirements, particularly for high speed small craft. These impacts, referred to as slamming, generate highly dynamic loads, which have both local and global effects. This work focused on obtaining high quality measurements of the loading and responses of flexible hull panels during slamming events. Significant research into slamming loads and pressures has previously been undertaken, dating back to 1929, however there is a lack of experimental data on flexible structures accurate enough to allow for validation of methods for predicting structural response. A series of 1030 x 600 mm single skin and sandwich composite panels with flexural rigidities between 1,540 and 20,100 Nm have been tested in constant velocity impacts up to 6.0 m/s with deadrise angles of 10, 20 and 30 using a purpose built testing facility. The results from these tests have been compared with previous experimental work undertaken on a nominally rigid panel. Additionally a range of analytical theories for the prediction of the loads and pressures acting on a rigid wedge have been compared to the experimentally measured values. The hydroelastic effects during slamming of flexible structures have been characterised. Significant decreases in peak pressure at the centre of up to 50% and increases at the outer edge of the panel of up to 100% have been seen, both of which are predominately attributed to kinematic changes during the impact. Previous inertial based hydroelasticity onset theories are shown to be unsupported by the experimental data, with the greatest effect of inertial effects occurring at the lowest impact velocities. Strains in the long direction of the panel of up to 50% of the strain in the short direction have been recorded at the centre of the panel, illustrating the importance of considering a rectangular panel undergoing slamming impacts as three dimensional. Transverse shear force at the outer edge of the panel has been characterised and shown to be significantly higher than that predicted from traditional design methods. A range of numerical models, including a full dynamic Combined Eulerian Lagrangian model have been developed and their ability to predict the panel responses assessed. |
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dc.publisher |
ResearchSpace@Auckland |
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dc.relation.ispartof |
PhD Thesis - University of Auckland |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
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dc.title |
Mechanics of Flexible Composite Hull Panels Subjected to Water Impacts |
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dc.type |
Thesis |
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thesis.degree.grantor |
The University of Auckland |
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thesis.degree.level |
Doctoral |
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thesis.degree.name |
PhD |
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dc.rights.holder |
Copyright: The Author |
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pubs.author-url |
http://hdl.handle.net/2292/21184 |
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dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
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pubs.elements-id |
413290 |
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pubs.org-id |
Engineering |
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pubs.org-id |
Mechanical Engineering |
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pubs.record-created-at-source-date |
2013-12-02 |
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dc.identifier.wikidata |
Q112903020 |
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