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Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy

2021-09Artigo científico Acesso aberto
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datacite.subject.fosCiências Naturais::Ciências Físicas
datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
datacite.subject.fosCiências Naturais::Outras Ciências Naturais
datacite.subject.sdg03:Saúde de Qualidade
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorMacek, Wojciech
dc.contributor.authorBranco, Ricardo
dc.contributor.authorCosta, José Domingos
dc.contributor.authorPereira, Cândida
dc.date.accessioned2026-02-10T12:24:56Z
dc.date.available2026-02-10T12:24:56Z
dc.date.issued2021-09
dc.description.abstractThe paper studies the effect of strain-loading sequence on fatigue lifetime and fracture surface topographies in 7075-T651 aluminum alloy specimens. Fatigue tests were performed in two ways: (i) constant-amplitude loading and (ii) two series of variable amplitude loading with non-zero mean strain values. The topography of the fatigue fractures was measured over their entire surfaces with the help of an optical confocal measurement system. The results of fatigue tests in the form of equivalent strains, εaeq, such as the weighted mean of strain components, εa1, εa2, and fatigue life, Nf, were used as the sum of the partial number of cycles N1, and N2. This study indicates, inter alia, that the values of the fracture surface parameter core height Sk, found in the two-step loading program, are linearly dependent on the equivalent strain, and logarithmically dependent on the fatigue life.eng
dc.description.sponsorshipThe author gratefully acknowledges Mr. Ryszard Czerwínski from Technolutions for providing fracture surface measurement. This research is sponsored by FEDER funds through the program COMPETE – Programa Operacional Factores de Competitividade – and by national funds through FCT – Fundação para a Ciência e a Tecnologia – under the project UIDB/00285/2020.
dc.identifier.citationWojciech Macek, Ricardo Branco, José Domingos Costa, Cândida Pereira, Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy, Mechanics of Materials, Volume 160, 2021, 103972, ISSN 0167-6636, https://doi.org/10.1016/j.mechmat.2021.103972.
dc.identifier.doi10.1016/j.mechmat.2021.103972
dc.identifier.issn0167-6636
dc.identifier.urihttp://hdl.handle.net/10400.8/15589
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationCentre for Mechanical Enginnering, Materials and Processes
dc.relation.hasversionhttps://www.sciencedirect.com/science/article/pii/S0167663621002106?via%3Dihub
dc.relation.ispartofMechanics of Materials
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSurface metrology
dc.subjectFatigue of metals
dc.subjectFractography
dc.subjectLow-cycle fatigue
dc.subjectAluminium alloys
dc.titleStrain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloyeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Mechanical Enginnering, Materials and Processes
oaire.awardURIhttp://hdl.handle.net/10400.8/13142
oaire.citation.endPage11
oaire.citation.startPage1
oaire.citation.titleMechanics of Materials
oaire.citation.volume160
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNamePereira Malça
person.givenNameCândida Maria dos Santos
person.identifier.ciencia-id8418-2828-E3C2
person.identifier.orcid0000-0003-0012-4380
person.identifier.scopus-author-id560 255 370 00
relation.isAuthorOfPublicationccbc8ddf-258c-43e2-80b9-ea2320721842
relation.isAuthorOfPublication.latestForDiscoveryccbc8ddf-258c-43e2-80b9-ea2320721842
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The paper studies the effect of strain-loading sequence on fatigue lifetime and fracture surface topographies in 7075-T651 aluminum alloy specimens. Fatigue tests were performed in two ways: (i) constant-amplitude loading and (ii) two series of variable amplitude loading with non-zero mean strain values. The topography of the fatigue fractures was measured over their entire surfaces with the help of an optical confocal measurement system. The results of fatigue tests in the form of equivalent strains, εaeq, such as the weighted mean of strain components, εa1, εa2, and fatigue life, Nf, were used as the sum of the partial number of cycles N1, and N2. This study indicates, inter alia, that the values of the fracture surface parameter core height Sk, found in the two-step loading program, are linearly dependent on the equivalent strain, and logarithmically dependent on the fatigue life.
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