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

Detalhes bibliográficos
Autor(a) principal: Macek, Wojciech
Data de Publicação: 2021
Outros Autores: Branco, Ricardo, Costa, José Domingos, Pereira, Cândida
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/95917
https://doi.org/10.1016/j.mechmat.2021.103972
Resumo: 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. © 2021 The Author(s)
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spelling Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloyAluminium alloysFatigue of metalsFractographyLow-cycle fatigueSurface metrologyThe 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. © 2021 The Author(s)Elsevier2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/95917http://hdl.handle.net/10316/95917https://doi.org/10.1016/j.mechmat.2021.103972eng01676636Macek, WojciechBranco, RicardoCosta, José DomingosPereira, Cândidainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-05-25T01:41:39Zoai:estudogeral.uc.pt:10316/95917Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:14:18.762901Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
title Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
spellingShingle Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
Macek, Wojciech
Aluminium alloys
Fatigue of metals
Fractography
Low-cycle fatigue
Surface metrology
title_short Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
title_full Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
title_fullStr Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
title_full_unstemmed Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
title_sort Strain sequence effect on fatigue life and fracture surface topography of 7075-T651 aluminium alloy
author Macek, Wojciech
author_facet Macek, Wojciech
Branco, Ricardo
Costa, José Domingos
Pereira, Cândida
author_role author
author2 Branco, Ricardo
Costa, José Domingos
Pereira, Cândida
author2_role author
author
author
dc.contributor.author.fl_str_mv Macek, Wojciech
Branco, Ricardo
Costa, José Domingos
Pereira, Cândida
dc.subject.por.fl_str_mv Aluminium alloys
Fatigue of metals
Fractography
Low-cycle fatigue
Surface metrology
topic Aluminium alloys
Fatigue of metals
Fractography
Low-cycle fatigue
Surface metrology
description 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. © 2021 The Author(s)
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/95917
http://hdl.handle.net/10316/95917
https://doi.org/10.1016/j.mechmat.2021.103972
url http://hdl.handle.net/10316/95917
https://doi.org/10.1016/j.mechmat.2021.103972
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 01676636
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
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