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Characterisation of head-hardened rail steel in terms of cyclic plasticity response and microstructure for improved material modelling

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dc.contributor.author Athukorala, Asitha C.
dc.contributor.author De Pellegrin, Dennis V.
dc.contributor.author Kourousis, Kyriakos I.
dc.date.accessioned 2017-02-02T14:38:32Z
dc.date.issued 2016
dc.identifier.uri http://hdl.handle.net/10344/5491
dc.description peer-reviewed en_US
dc.description.abstract Stress- and strain-controlled tests of heat treated high-strength rail steel (Australian Standard AS1085.1) have been performed in order to improve the characterisation of the said material׳s ratcheting and fatigue wear behaviour. The hardness of the rail head material has also been studied and it has been found that hardness reduces considerably below four-millimetres from the rail top surface. Historically, researchers have used test coupons with circular cross-sections to conduct cyclic load tests. Such test coupons, typically five-millimetres in gauge diameter and ten‐millimetres in grip diameter, are usually taken from the rail head sample. When there is considerable variation of material properties over the cross-section it becomes likely that localised properties of the rail material will be missed. In another case from the literature, disks 47 mm in diameter for a twin-disk rolling contact test machine were obtained directly from the rail sample and used to validate ratcheting and rolling contact fatigue wear models. The question arises: How accurate are such tests, especially when large material property gradients exist? In this research paper, the effects of rail sampling location on the ratcheting behaviour of AS1085.1 rail steel were investigated using rectangular-shaped specimens obtained at four different depths to observe their respective cyclic plasticity behaviour. The microstructural features of the test coupons were also analysed, especially the pearlite inter-lamellar spacing which showed strong correlation with both hardness and cyclic plasticity behaviour of the material. This work ultimately provides new data and testing methodology to aid the selection of valid parameters for material constitutive models to better understand rail surface ratcheting and wear. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Wear;366-367, pp. 416-424
dc.relation.uri http://dx.doi.org/10.1016/j.wear.2016.03.024
dc.rights This is the author’s version of a work that was accepted for publication in Wear. 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 Wear, 366-367, pp. 416-424, http://dx.doi.org/10.1016/j.wear.2016.03.024 en_US
dc.subject rail steel en_US
dc.subject plasticity en_US
dc.subject ratcheting en_US
dc.subject wear en_US
dc.subject hardness en_US
dc.subject inter-lamellar spacing en_US
dc.title Characterisation of head-hardened rail steel in terms of cyclic plasticity response and microstructure for improved material modelling 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.identifier.doi 10.1016/j.wear.2016.03.024
dc.date.embargoEndDate 2018-11-15
dc.embargo.terms 2018-11-15 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2694126


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