Fatigue and fracture mechanics of offshore wind turbine support structures

Show simple item record

dc.contributor.advisor Brennan, Feargal
dc.contributor.advisor Kolios, Athanasios
dc.contributor.author Lozano Minguez, Estivaliz
dc.date.accessioned 2016-03-08T15:16:31Z
dc.date.available 2016-03-08T15:16:31Z
dc.date.issued 2015-07
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/9756
dc.description.abstract Wind power, especially offshore, is considered to be one of the most promising sources of ‘clean’ energy towards meeting the EU targets for 2020 and 2050. However, its popularity has always fluctuated with the price of fossil fuels since nowadays wind electricity production cannot compete with nuclear or coal electricity production. Support structures are thought to be one of the main drivers for reducing costs in order to make the wind industry more economically efficient. Foundations and towers should be fit for purpose, extending their effective service life but avoiding costs of oversizing. An exhaustive review of the background and state of the art of the Fatigue-Life assessment approaches has been carried out, combining analysis of the gathered experimental data and the development of Finite Element models based on contemporary 3D solid models with diverse Regression Analyses, in order to identify their weakness and evaluate their accuracy. This research shows that the guides and practices currently employed in the design and during the operation of the offshore wind turbine support structures are obsolete and not useful for optimisation, which generally leads to conservationism and an unnecessary increase in costs. The basis for a comprehensive update of the Girth Weld and Tubular Joint S-N curves and the Stress Concentration Factors of Tubular Joints has been set out. Furthermore, a reliable methodology for deriving the Stress Intensity Factor at the deepest point of a semi-elliptical surface saddle crack in a tubular welded T-joint has been proposed. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder. en_UK
dc.subject Tubular joint en_UK
dc.subject Offshore wind support en_UK
dc.subject Stress concentration factor en_UK
dc.subject Stress intensity factor en_UK
dc.subject S-N curve en_UK
dc.subject Semi-elliptical crack en_UK
dc.subject Tubular joint weld profile en_UK
dc.title Fatigue and fracture mechanics of offshore wind turbine support structures en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Doctoral en_UK
dc.type.qualificationname PhD en_UK

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search CERES


My Account