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On the utilisation of nonlinear plasticity models in military aircraft fatigue estimation: a preliminary comparison

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dc.contributor.author Agius, Dylan J.
dc.contributor.author Wallbrink, Chris
dc.contributor.author Hu, Weiping
dc.contributor.author Kajtaz, Mladenko
dc.contributor.author Wang, Chun H.
dc.contributor.author Kourousis, Kyriakos I.
dc.date.accessioned 2018-11-20T16:20:29Z
dc.date.issued 2017
dc.identifier.uri http://hdl.handle.net/10344/7335
dc.description peer-reviewed en_US
dc.description.abstract Strain-life methodologies are commonly employed for fatigue estimation in military aircraft structures. These methodologies rely on models describing the elastoplastic response of the material under cycling. Despite the numerous advanced plasticity models proposed and utilised in various engineering problems over the past decades, the Masing model remains a popular choice in fatigue analysis software, mainly due to its simplicity. However, in the case of military aircraft load spectra including scattered overloads the Masing model fails to represent adequately transient cyclic phenomena, such as mean stress relaxation and strain ratcheting. In this study, four well-known constitutive plasticity models have been selected as potential substitutes for the Masing model within a defence organisation in-house developed fatigue analysis software. These models assessed were the well-known Multicomponent Armstrong Frederick Model (MAF) and three of its derivatives: MAF with threshold (MAFT), Ohno-Wang (OW) and MAF with Multiplier (MAFM). The models were calibrated with the use of existing experimental data, obtained from aircraft aluminium alloy tests. Optimisation of the parameters was performed through a genetic algorithm-based commercial software. The models were incorporated in the fatigue analysis software and their performance was evaluated statistically and compared against each other and with the Masing model for a series of different flight load spectra for a military aircraft. The results show that all four models have achieved a drastic improvement in fatigue analysis, with the MAFT model giving a slightly better performance. Crown Copyright (C) 2017 Published by Elsevier Masson SAS. All rights reserved. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Aerospace Science and Technology;71, pp. 25-29
dc.relation.uri https://doi.org/10.1016/j.ast.2017.09.004
dc.rights This is the author’s version of a work that was accepted for publication in Aerospace Science and Technology . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Aerospace Science and Technology, 2017, 71, pp. 25-29, https://doi.org/10.1016/j.ast.2017.09.004 en_US
dc.subject Cyclic plasticity en_US
dc.subject Kinematic hardening en_US
dc.subject Isotropic hardening en_US
dc.subject Ratcheting en_US
dc.subject Fatigue life en_US
dc.subject Aircraft fatigue en_US
dc.title On the utilisation of nonlinear plasticity models in military aircraft fatigue estimation: a preliminary comparison en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.date.updated 2018-11-20T16:10:50Z
dc.description.version ACCEPTED
dc.identifier.doi 10.1016/j.ast.2017.09.004
dc.contributor.sponsor Australian Department of Defence en_US
dc.relation.projectid 2014/1032188/1 en_US
dc.date.embargoEndDate 2019-09-12
dc.embargo.terms 2019-09-12 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2735593
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Aerospace Science And Technology
dc.description.status peer-reviewed


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