Residual stresses in rail-ends from the in-service insulated rail joints using neutron diffraction

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dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorRathod, Cen_AU
dc.contributor.authorWexler, Den_AU
dc.contributor.authorBoyd, Pen_AU
dc.contributor.authorDhanasekar, Men_AU
dc.date.accessioned2015-10-14T01:12:17Zen_AU
dc.date.available2015-10-14T01:12:17Zen_AU
dc.date.issued2013-09-23en_AU
dc.date.statistics2015-10-09en_AU
dc.description.abstractInsulated rail joints (IRJs) are an integral part of the rail track signaling system and pose significant maintenance and replacement costs due to their low and fluctuating service lives. Failure occurs mainly in rail head region, bolt- holes of fishplates and web-holes of the rails. Propagation of cracks is influenced by the evolution of internal residual stresses in rails during rail manufacturing (hot-rolling, roller-straightening, and head-hardening process), and during service, particularly in heavy rail haul freight systems where loads are high. In this investigation, rail head accumulated residual stresses were analysed using neutron diffraction at the Australian Nuclear Science and Technology Organisation (ANSTO). Two ex-service two head-hardened rail joints damaged under different loading were examined and results were compared with those obtained from an unused rail joint reference sample in order to differentiate the stresses developed during rail manufacturing and stresses accumulated during rail service. Neutron diffraction analyses were carried out on the samples in longitudinal, transverse and vertical directions, and on 5mm thick sliceed samples cut by Electric Discharge Machining (EDM). For the rail joints from the service line, irrespective of loading conditions and in-service times, results revealed similar depth profiles of stress distribution. Evolution of residual stress fields in rails due to service was also accompanied by evidence of larger material flow based on reflected light and scanning electron microscopy studies. Stress evolution in the vicinity of rail ends was characterised by a compressive layer, approximately 5 mm deep, and a tension zone located approximately 5- 15mm below the surfaces. A significant variation of d0 with depth near the top surface was detected and was attributed to decarburization in the top layer induced by cold work. Stress distributions observed in longitudinal slices of the two different deformed rail samples were found to be similar. For the undeformed rail, the stress distributions obtained could be attributed to variations associated with thermo-mechanical history of the rail.© 2014, Trans Tech Publications.en_AU
dc.identifier.citationLuzin, V., Rathod, C., Wexler, D., Boyd, P., & Dhanasekar, M., & (2013). Residual stresses in rail-ends from the in-service insulated rail joints using neutron diffraction. Paper presented to the 9th International Conference on Residual Stresses (ICRS 9), 7 – 9 October 2012, Garmisch-Partenkirchen, Germany. In S.J.B. Kurz, E.J. Mittemeijer & B. Scholtes (Eds.) Materials Science Forum, 768-769, (pp. 741-746). Switzerland: Trans Tech Publications Inc. doi:10.4028/www.scientific.net/MSF.768-769.741en_AU
dc.identifier.conferenceenddate9 October 2012en_AU
dc.identifier.conferencename9th International Conference on Residual Stresses (ICRS 9)en_AU
dc.identifier.conferenceplaceGarmisch-Partenkirchen, Germany.en_AU
dc.identifier.conferencestartdate7 October 2012en_AU
dc.identifier.govdoc6156en_AU
dc.identifier.issn0255-5476en_AU
dc.identifier.journaltitleMaterials Science Forumen_AU
dc.identifier.pagination741-746en_AU
dc.identifier.urihttp://dx.doi.org/10.4028/www.scientific.net/MSF.768-769.741en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6322en_AU
dc.identifier.volume768-769en_AU
dc.language.isoenen_AU
dc.publisherTrans Tech Pblicationsen_AU
dc.subjectRailwaysen_AU
dc.subjectCargoen_AU
dc.subjectANSTOen_AU
dc.subjectResidual stressesen_AU
dc.subjectElectron microscopyen_AU
dc.subjectDecarburizationen_AU
dc.titleResidual stresses in rail-ends from the in-service insulated rail joints using neutron diffractionen_AU
dc.typeConference Paperen_AU
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