Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach

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dc.contributor.authorShittu, Abdulhakim Adeoye
dc.contributor.authorMehmanparast, Ali
dc.contributor.authorShafiee, Mahmood
dc.contributor.authorKolios, Athanasios
dc.contributor.authorHart, Phil
dc.contributor.authorPilario, Karl Ezra
dc.date.accessioned2020-07-13T14:25:58Z
dc.date.available2020-07-13T14:25:58Z
dc.date.freetoread2020-07-13
dc.date.issued2020-07-12
dc.description.abstractThe structural integrity of offshore wind turbine (OWT) support structures is affected by one of the most severe damage mechanisms known as pitting corrosion‐fatigue. In this study, the structural reliability of such structures subjected to pitting corrosion‐fatigue is assessed using a damage tolerance modelling approach. A probabilistic model that ascertains the reliability of the structure is presented, incorporating the randomness in cyclic load and corrosive environment as well as uncertainties in shape factor, pit size and aspect ratio. A non‐intrusive formulation is proposed consisting of a sequence of steps. First, a stochastic parametric Finite Element Analysis (FEA) is performed using SMART© crack growth and Design Xplorer© facilities within the software package ANSYS. Secondly, the results obtained from the FEA are processed using an Artificial Neural Network (ANN) response surface modelling technique. Finally, the First Order Reliability Method (FORM) is used to calculate the reliability indices of components. The results reveal that for the inherent stochastic conditions, the structure becomes unsafe after the 18th year, before the attainment of the design life of 20 years. The FEA results are in very good agreement with results obtained from analysis steps outlined in design standard BS 7910 and other references designated as ‘theoretical analysis methods’ in this study. The results predict, for the case study, that the pit growth life is approximately 56% of the total pitting corrosion fatigue life. Sensitivity analysis results show that the aspect ratio of pits at critical size plays a significant role on the reliability of the structure.en_UK
dc.identifier.citationShittu AA, Mehmanparast A, Shafiee M, et al., (2020) Structural reliability assessment of offshore wind turbine support structures subjected to pitting 23 (November 2020).corrosion-fatigue: a damage tolerance modelling approach. Wind Energy, Volume 23, November 2020, pp.2004-2026en_UK
dc.identifier.cris27074068
dc.identifier.issn1095-4244
dc.identifier.urihttps://doi.org/10.1002/we.2542
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/15550
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectartificial neural networken_UK
dc.subjectnon-intrusive formulationsen_UK
dc.subjectoffshore wind structuresen_UK
dc.subjectpitting corrosion fatigueen_UK
dc.subjectreliability indexen_UK
dc.subjectstructural reliability analysisen_UK
dc.titleStructural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approachen_UK
dc.typeArticleen_UK

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