Effect of Underload Cycles on Oxide-Induced Crack Closure Development in Cr-Mo Low-Alloy Steel

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dc.contributor.authorPokorný, Pavelcs
dc.contributor.authorVojtek, Tomášcs
dc.contributor.authorJambor, Michalcs
dc.contributor.authorNáhlík, Lubošcs
dc.contributor.authorHutař, Pavelcs
dc.coverage.issue10cs
dc.coverage.volume14cs
dc.date.accessioned2021-11-26T11:54:55Z
dc.date.available2021-11-26T11:54:55Z
dc.date.issued2021-05-01cs
dc.description.abstractUnderload cycles with small load amplitudes below the fatigue crack growth threshold are dominantly considered as insignificant cycles without any influence on fatigue lifespan of engineering structural components. However, this paper shows that in some cases these underload cycles can retard the consequent crack propagation quite significantly. This phenomenon is a consequence of oxide-induced crack closure development during cyclic loading below the threshold. The experimentally described effect of fatigue crack growth retardation was supported by measurement of the width and the thickness of the oxide debris layer using the EDS technique and localized FIB cuts, respectively. Both the retardation effect and the amount of oxide debris were larger for higher number and larger amplitudes of the applied underload cycles. Crack closure measurement revealed a gradual increase of the closure level during underload cycling. Specimens tested in low air humidity, as well as specimens left with the crack open for the same time as that needed for application of the underload cycles, revealed no retardation effect. The results can improve our understanding of environmental effects on fatigue crack propagation and understanding the differences between the results of laboratory testing and the fatigue lives of components in service.en
dc.formattextcs
dc.format.extent1-22cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationMaterials . 2021, vol. 14, issue 10, p. 1-22.en
dc.identifier.doi10.3390/ma14102530cs
dc.identifier.issn1996-1944cs
dc.identifier.other172960cs
dc.identifier.urihttp://hdl.handle.net/11012/202975
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofMaterialscs
dc.relation.urihttps://www.mdpi.com/1996-1944/14/10/2530cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1996-1944/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectunderload cyclesen
dc.subjectcrack closureen
dc.subjectthresholden
dc.subjectfatigue crack growthen
dc.subjectoxidationen
dc.subjectEA4T steelen
dc.titleEffect of Underload Cycles on Oxide-Induced Crack Closure Development in Cr-Mo Low-Alloy Steelen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-172960en
sync.item.dbtypeVAVen
sync.item.insts2021.11.30 12:55:19en
sync.item.modts2021.11.30 12:15:31en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav mechaniky těles, mechatroniky a biomechanikycs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé kovové materiály a kompozity na bázi kovůcs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Příprava a charakterizace nanostrukturcs
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Příprava a charakterizace nanostruktur
Pokročilé kovové materiály a kompozity na bázi kovů
Ústav mechaniky těles, mechatroniky a biomechaniky