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Rotary fatigue life of NiTi alloy wires and FEA modelling of fatigue damage

2017Conference object Open access
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dc.contributor.authorMontalvão, Diogo
dc.contributor.authorCarvalho, André
dc.contributor.authorFreitas, Manuel
dc.contributor.authorReis, Luís
dc.date.accessioned2020-05-27T18:38:13Z
dc.date.available2020-05-27T18:38:13Z
dc.date.issued2017
dc.description.abstractNickel-Titanium (NiTi) alloys with superelastic properties have been increasingly introduced as a substitute to more conventional alloys. For example, NiTi alloys used in Dentistry, such as in Endodontic rotary files, possess superelastic properties that allow for the file to follow teeth root canals more easily than their stainless-steel counterparts. Nevertheless, during surgery, the file is subjected to cyclic bending loading, since it is spinning while being deformed inside the curved canal. Therefore, these instruments are prone to fracture due to fatigue, without showing any visible signals of degradation. This problem brought new challenges on how new instruments should be tested, as NiTi alloys are highly non-linear. However, most existing test setups ignore the fracture mechanics involved in the fatigue phenomenon. In this work, the results of rotary fatigue tests for NiTi wires from different manufacturers is presented. The formulation is described, where the material strength reduction can be quantified from the determination of the strain and the number of cycles until failure. Experimental tests as well as numerical Finite Element Analysis (FEA) simulations are presented to better understand the fatigue fracture mechanisms present in NiTi alloys, showing that there is good agreement between the predicted strains (difficult to measure in such small wires) and the cycles to failure. One characteristic is that these alloys exhibit a large hysteresis in the elastic domain if loaded up to the mixture of austenitic and martensitic phases (also known as B19’ martensite) and then unloaded. Rotating bending fatigue tests of NiTi wires show that, when loaded up to the B19’ martensite, the number of cycles to failure decrease with the applied strain.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMONTALVÃO, Diogo; [et al] – Rotary fatigue life of NiTi alloy wires and FEA modelling of fatigue damage. In Proceedings of the LCF8 – Eight International conference on Low Cycle Fatigue. Dresden, Alemanha. 2017. Pp. 1-6pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/11739
dc.language.isoengpt_PT
dc.subjectEndodontic filespt_PT
dc.subjectNiTi alloyspt_PT
dc.subjectRotary bending fatiguept_PT
dc.subjectFinite Element Analysispt_PT
dc.titleRotary fatigue life of NiTi alloy wires and FEA modelling of fatigue damagept_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FEMS%2F50022%2F2013/PT
oaire.citation.conferencePlaceJune 27-29, 2017 - Dresden, Germanypt_PT
oaire.citation.endPage6pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleLCF8 – Eight International conference on Low Cycle Fatiguept_PT
oaire.fundingStream5876
person.familyNameCarvalho
person.givenNameAndré
person.identifier.ciencia-id4719-C315-3211
person.identifier.orcid0000-0002-2089-7156
person.identifier.ridI-7571-2015
person.identifier.scopus-author-id58778332900
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublication.latestForDiscovery68e457b2-45ab-449f-a240-7317c1a42c1b
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