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A numerical study of the effect of single overloads on plasticity induced crack closure

2017Journal article Open access
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dc.contributor.authorBaptista, J.B.
dc.contributor.authorAntunes, F.V.
dc.contributor.authorCorreia, Luís M.
dc.contributor.authorBranco, R.
dc.date.accessioned2017-09-12T16:16:41Z
dc.date.available2017-09-12T16:16:41Z
dc.date.issued2017
dc.description.abstractIn this work, the effect of single overloads on plasticity induced crack closure is studied. An elastic-plastic finite element model was developed and the crack opening level was calculated from the contact forces along the crack flank. The effects of the loading parameters and stress state are analysed, and the mechanisms behind crack closure variations are identified. An overload is a traumatic event that eliminates material’s memory relative to the load history. Crack tip blunting is the mechanism behind this memory loss, since it eliminates crack closure. Material hardening has a major relevance on the evolution of plastic blunting, which was evident in the variation of the CTOD parameter. On the other hand, the overload produces strong plastic deformation ahead of the crack tip, giving rise to conditions for the rapid generation of crack closure higher than before the event. The peak of crack closure was found to increase linearly with the load increase above the maximum baseline value. The crack is totally closed for overload ratios of about 2.5. Empirical models were developed for the peak of crack closure, for the delay of this peak and for the stabilization distance after the overload. Finally, the stress state was found to have a major effect on crack closure level after an overload.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBAPTISTA, J.B. [et al.] (2017) - A numerical study of the effect of single overloads on plasticity induced crack closure, Theoretical and Applied Fracture Mechanics, ISSN 0167-8442.Volume 88, p.51-63,pt_PT
dc.identifier.doihttps://doi.org/10.1016/j.tafmec.2016.12.001pt_PT
dc.identifier.issn0167-8442
dc.identifier.urihttp://hdl.handle.net/10400.11/5685
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevier BVpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0167844216301793pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPlasticity induced crack closurept_PT
dc.subjectOverloadpt_PT
dc.subjectBluntingpt_PT
dc.subjectResidual plastic deformationpt_PT
dc.subjectFinite element methodpt_PT
dc.titleA numerical study of the effect of single overloads on plasticity induced crack closurept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FEMS-PRO%2F3148%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/COMPETE/PEst-C%2FEME%2FUI0285%2F2013/PT
oaire.citation.endPage63pt_PT
oaire.citation.startPage51pt_PT
oaire.citation.titleTheoretical and Applied Fracture Mechanicspt_PT
oaire.citation.volume88pt_PT
oaire.fundingStream5876-PPCDTI
oaire.fundingStreamCOMPETE
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublication63f1192d-c477-4a6d-accf-745bae20c35c
relation.isProjectOfPublicationa5bee73c-f286-4cae-9cf1-b0cebff5d9c0
relation.isProjectOfPublication.latestForDiscovery63f1192d-c477-4a6d-accf-745bae20c35c

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