Crack tip mechanisms: a numerical analysis
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/101633 https://doi.org/10.1016/j.prostr.2020.01.147 |
Resumo: | Fatigue crack propagation is usually studied using da/dN-∆K curves obtained experimentally. However, the use of ∆K does not provide any information into the mechanics which occur at the crack tip and are effectively responsible for fatigue crack growth. The objective here is to study crack tip phenomena using the CTOD. The aspects studied are the crack closure level, the elastic regime of ∆K and the crack tip plastic deformation, which was related with fatigue crack propagation. The elastic load range, ∆Kel, was found to increase linearly with material’s yield stress. Well defined relations were found between the elastic and the plastic deformations, which greatly depend on material. The fatigue crack growth rate, obtained experimentally, was plotted versus plastic CTOD range, δp, for the different materials. Finally, the CTOD versus load curves were used to predict fatigue threshold and to study material hardening after crack propagation. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Crack tip mechanisms: a numerical analysisFatigue crack propagationCTODcrack closurefatigue thresholdFatigue crack propagation is usually studied using da/dN-∆K curves obtained experimentally. However, the use of ∆K does not provide any information into the mechanics which occur at the crack tip and are effectively responsible for fatigue crack growth. The objective here is to study crack tip phenomena using the CTOD. The aspects studied are the crack closure level, the elastic regime of ∆K and the crack tip plastic deformation, which was related with fatigue crack propagation. The elastic load range, ∆Kel, was found to increase linearly with material’s yield stress. Well defined relations were found between the elastic and the plastic deformations, which greatly depend on material. The fatigue crack growth rate, obtained experimentally, was plotted versus plastic CTOD range, δp, for the different materials. Finally, the CTOD versus load curves were used to predict fatigue threshold and to study material hardening after crack propagation.2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/101633http://hdl.handle.net/10316/101633https://doi.org/10.1016/j.prostr.2020.01.147eng24523216Antunes, F. V.Borges, M. F. M.Marques, B.Prates, P.Branco, R.info: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:RCAAP2022-09-05T20:43:30Zoai:estudogeral.uc.pt:10316/101633Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:18:47.171420Repositório 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 |
Crack tip mechanisms: a numerical analysis |
title |
Crack tip mechanisms: a numerical analysis |
spellingShingle |
Crack tip mechanisms: a numerical analysis Antunes, F. V. Fatigue crack propagation CTOD crack closure fatigue threshold |
title_short |
Crack tip mechanisms: a numerical analysis |
title_full |
Crack tip mechanisms: a numerical analysis |
title_fullStr |
Crack tip mechanisms: a numerical analysis |
title_full_unstemmed |
Crack tip mechanisms: a numerical analysis |
title_sort |
Crack tip mechanisms: a numerical analysis |
author |
Antunes, F. V. |
author_facet |
Antunes, F. V. Borges, M. F. M. Marques, B. Prates, P. Branco, R. |
author_role |
author |
author2 |
Borges, M. F. M. Marques, B. Prates, P. Branco, R. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Antunes, F. V. Borges, M. F. M. Marques, B. Prates, P. Branco, R. |
dc.subject.por.fl_str_mv |
Fatigue crack propagation CTOD crack closure fatigue threshold |
topic |
Fatigue crack propagation CTOD crack closure fatigue threshold |
description |
Fatigue crack propagation is usually studied using da/dN-∆K curves obtained experimentally. However, the use of ∆K does not provide any information into the mechanics which occur at the crack tip and are effectively responsible for fatigue crack growth. The objective here is to study crack tip phenomena using the CTOD. The aspects studied are the crack closure level, the elastic regime of ∆K and the crack tip plastic deformation, which was related with fatigue crack propagation. The elastic load range, ∆Kel, was found to increase linearly with material’s yield stress. Well defined relations were found between the elastic and the plastic deformations, which greatly depend on material. The fatigue crack growth rate, obtained experimentally, was plotted versus plastic CTOD range, δp, for the different materials. Finally, the CTOD versus load curves were used to predict fatigue threshold and to study material hardening after crack propagation. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019 |
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/10316/101633 http://hdl.handle.net/10316/101633 https://doi.org/10.1016/j.prostr.2020.01.147 |
url |
http://hdl.handle.net/10316/101633 https://doi.org/10.1016/j.prostr.2020.01.147 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
24523216 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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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1799134082298281984 |