Classically determined effective Delta K fails to quantify crack growth rates

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dc.contributor.authorVojtek, Tomášcs
dc.contributor.authorPokorný, Pavelcs
dc.contributor.authorOplt, Tomášcs
dc.contributor.authorJambor, Michalcs
dc.contributor.authorNáhlík, Lubošcs
dc.contributor.authorHerrero, Diegocs
dc.contributor.authorHutař, Pavelcs
dc.coverage.issue1cs
dc.coverage.volume108cs
dc.date.issued2020-08-01cs
dc.description.abstractDecomposition of the resistance to fatigue crack growth into the intrinsic and extrinsic component is very important for understanding of fatigue failure mechanisms, relation to microstructure and modelling of residual fatigue life. Crack closure for four grades of steel were estimated by the difference between K-max values and the effective Delta K-eff values (measured at the load ratio R = 0.8) corresponding to the same crack growth rate. The results showed that crack closure values obtained by the difference K-max - Delta K-eff were not in agreement with the available crack closure models, both the Newman's model of plasticity-induced closure and the results from finite element analysis. The discrepancies could not be explained by the effect of mean stress, specimen thickness, loading amplitude or T-stress. Therefore, the application of fracture mechanics to fatigue cracks should be revisited. It was pointed out that Delta K-eff may not be a good parameter for quantification of the crack driving force, since the relationship between K-max - K-cl and the cyclic plastic deformation at the crack tip might not be linear.en
dc.formattextcs
dc.format.extent1-13cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationTheoretical and Applied Fracture Mechanics. 2020, vol. 108, issue 1, p. 1-13.en
dc.identifier.doi10.1016/j.tafmec.2020.102608cs
dc.identifier.issn0167-8442cs
dc.identifier.orcid0000-0003-2368-3126cs
dc.identifier.orcid0000-0001-9786-2034cs
dc.identifier.orcid0000-0002-1570-2705cs
dc.identifier.orcid0000-0003-3827-5408cs
dc.identifier.other165546cs
dc.identifier.researcheridE-6515-2012cs
dc.identifier.researcheridA-6475-2009cs
dc.identifier.researcheridB-2957-2009cs
dc.identifier.scopus22635754000cs
dc.identifier.scopus22634557800cs
dc.identifier.urihttp://hdl.handle.net/11012/195859
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofTheoretical and Applied Fracture Mechanicscs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0167844220301841cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0167-8442/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectCrack closureen
dc.subjecteffective Delta Ken
dc.subjectConstrainten
dc.subjectFatigue crack propagationen
dc.subjectFinite element analysisen
dc.subjectSteelen
dc.titleClassically determined effective Delta K fails to quantify crack growth ratesen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-165546en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:51:14en
sync.item.modts2025.01.17 15:17:37en
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Pokročilé kovové materiály a kompozity na bázi kovůcs
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