Evaluation of overload effects on fatigue crack growth and closure

Detalhes bibliográficos
Autor(a) principal: Borrego, L. P.
Data de Publicação: 2003
Outros Autores: Ferreira, J. M., Pinho da Cruz, J. M., Costa, J. M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/4272
https://doi.org/10.1016/S0013-7944(02)00119-4
Resumo: Fatigue crack propagation tests with single tensile peak overloads have been performed in 6082-T6 aluminium alloy at several baseline [Delta]K levels and stress ratios of 0.05 and 0.25. The tests were carried out at constant [Delta]K conditions. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post-overload behaviour is discussed in terms of overload ratio, baseline [Delta]K level and stress ratio. The crack closure parameter U was obtained and compared with the crack growth transients. Experimental support is given for the hypothesis that plasticity-induced closure is the main cause of overload retardation for plane stress conditions. Predictions based on crack closure measurements show good correlation with the observed crack growth rates for all the post-overload transients when discontinuous closure is properly taken into account.
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spelling Evaluation of overload effects on fatigue crack growth and closureAluminium alloysOverloadsCrack closureDiscontinuous closurePartial closure modelFatigue crack propagation tests with single tensile peak overloads have been performed in 6082-T6 aluminium alloy at several baseline [Delta]K levels and stress ratios of 0.05 and 0.25. The tests were carried out at constant [Delta]K conditions. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post-overload behaviour is discussed in terms of overload ratio, baseline [Delta]K level and stress ratio. The crack closure parameter U was obtained and compared with the crack growth transients. Experimental support is given for the hypothesis that plasticity-induced closure is the main cause of overload retardation for plane stress conditions. Predictions based on crack closure measurements show good correlation with the observed crack growth rates for all the post-overload transients when discontinuous closure is properly taken into account.http://www.sciencedirect.com/science/article/B6V2R-46WPH0W-3/1/82b49d3e31362370a08505d5d300b60c2003info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleaplication/PDFhttp://hdl.handle.net/10316/4272http://hdl.handle.net/10316/4272https://doi.org/10.1016/S0013-7944(02)00119-4engEngineering Fracture Mechanics. 70:11 (2003) 1379-1397Borrego, L. P.Ferreira, J. M.Pinho da Cruz, J. M.Costa, J. M.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:RCAAP2020-11-06T16:59:29Zoai:estudogeral.uc.pt:10316/4272Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:58:28.603597Repositório 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 Evaluation of overload effects on fatigue crack growth and closure
title Evaluation of overload effects on fatigue crack growth and closure
spellingShingle Evaluation of overload effects on fatigue crack growth and closure
Borrego, L. P.
Aluminium alloys
Overloads
Crack closure
Discontinuous closure
Partial closure model
title_short Evaluation of overload effects on fatigue crack growth and closure
title_full Evaluation of overload effects on fatigue crack growth and closure
title_fullStr Evaluation of overload effects on fatigue crack growth and closure
title_full_unstemmed Evaluation of overload effects on fatigue crack growth and closure
title_sort Evaluation of overload effects on fatigue crack growth and closure
author Borrego, L. P.
author_facet Borrego, L. P.
Ferreira, J. M.
Pinho da Cruz, J. M.
Costa, J. M.
author_role author
author2 Ferreira, J. M.
Pinho da Cruz, J. M.
Costa, J. M.
author2_role author
author
author
dc.contributor.author.fl_str_mv Borrego, L. P.
Ferreira, J. M.
Pinho da Cruz, J. M.
Costa, J. M.
dc.subject.por.fl_str_mv Aluminium alloys
Overloads
Crack closure
Discontinuous closure
Partial closure model
topic Aluminium alloys
Overloads
Crack closure
Discontinuous closure
Partial closure model
description Fatigue crack propagation tests with single tensile peak overloads have been performed in 6082-T6 aluminium alloy at several baseline [Delta]K levels and stress ratios of 0.05 and 0.25. The tests were carried out at constant [Delta]K conditions. Crack closure was monitored in all tests by the compliance technique using a pin microgauge. The observed transient post-overload behaviour is discussed in terms of overload ratio, baseline [Delta]K level and stress ratio. The crack closure parameter U was obtained and compared with the crack growth transients. Experimental support is given for the hypothesis that plasticity-induced closure is the main cause of overload retardation for plane stress conditions. Predictions based on crack closure measurements show good correlation with the observed crack growth rates for all the post-overload transients when discontinuous closure is properly taken into account.
publishDate 2003
dc.date.none.fl_str_mv 2003
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dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/4272
http://hdl.handle.net/10316/4272
https://doi.org/10.1016/S0013-7944(02)00119-4
url http://hdl.handle.net/10316/4272
https://doi.org/10.1016/S0013-7944(02)00119-4
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Engineering Fracture Mechanics. 70:11 (2003) 1379-1397
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