Liu, Liu;
(2019)
On the design requirements against external blasts for naval ships.
Masters thesis (M.Phil), UCL (University College London).
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Abstract
This thesis attempts to rationalise and assess the existing design guidelines (by Lloyd‘s Register) for sizing the outer plating of a ship superstructure to resist an external air blast. Three-dimensional finite elements (FE) simulations and single degree of freedom (SDOF) analytical model were developed in this thesis that could model the dynamic structural response of the platings and to perform parametric investigations. A review of the current design guidelines, specifically on how the blast load parameters were specified by the Rules and Regulations of Lloyd’s Register and the assumptions behind the use of the scantling equation, is first provided by way of a design case study. Next, a non-linear SDOF model is formulated, together with three-dimensional FE simulations, to model the large plastic deformation of the plates. Results were presented in a format that will be useful to designers. The final part of this thesis compares the required plate thickness, predicted by the three different methods ( i.e. Lloyd‘s Register design rules, SDOF and FE), needed to resist a specified load intensity. It will be shown that the design guidelines by Lloyd‘s Register achieves the purpose of maintaining water or gas-tight integrity of a plating (this is to be expected); however, there exists significant unnecessary redundancies (over-design), with implications on light weighting, when compared to the results of the SDOF model and FE simulations. Additionally, the results will be summarised in the form of a failure map, which will facilitate the work of designers.
| Type: | Thesis (Masters) |
|---|---|
| Qualification: | M.Phil |
| Title: | On the design requirements against external blasts for naval ships |
| Event: | UCL |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2019. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/ 4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10073597 |
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