Revisiting the fracture forming limits of bulk forming under biaxial tension

Detalhes bibliográficos
Autor(a) principal: Sampaio, Rui F. V.
Data de Publicação: 2022
Outros Autores: Pragana, João, Bragança, Ivo, Silva, Carlos, Martins, Paulo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.21/14472
Resumo: The formability limits of bulk metal forming in principal strain space and in the effective strain vs. stress-triaxiality space are characterized by an uncertainty region in which cracks may be triggered by tension (mode I of fracture mechanics) or by out-of-plane shear (mode III). The problem in obtaining experimental data in this region has been known for a long time and the main objective of this paper is to present a new upset formability test geometry that can effectively contribute to the characterization of the formability limits of bulk metal forming parts subjected to biaxial tension. Alongside with this objective, this paper also presents an analytical expression for converting the fracture forming limit line corresponding to crack opening by mode III in principal strain space into a hyperbolic fracture limit curve in the effective strain vs. stress-triaxiality space. The overall methodology employed by the authors combines experimentation along with analytical and numerical modelling, and the contents of the paper is a step towards diminishing the actual lack of knowledge regarding failure by fracture in bulk metal forming parts subject to stress-triaxiality values beyond uniaxial tension. Results show that a new uncoupled ductile fracture criterion built upon combination of the integrands of the Cockcroft-Latham and McClintock criteria can be successfully used to model the physics of the bulk metal forming limits for the entire range of stress-triaxiality values corresponding to cracking on free surfaces.
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spelling Revisiting the fracture forming limits of bulk forming under biaxial tensionBulk formingFormability testsBiaxial tensionDuctile fractureExperimentationFinite element modellingThe formability limits of bulk metal forming in principal strain space and in the effective strain vs. stress-triaxiality space are characterized by an uncertainty region in which cracks may be triggered by tension (mode I of fracture mechanics) or by out-of-plane shear (mode III). The problem in obtaining experimental data in this region has been known for a long time and the main objective of this paper is to present a new upset formability test geometry that can effectively contribute to the characterization of the formability limits of bulk metal forming parts subjected to biaxial tension. Alongside with this objective, this paper also presents an analytical expression for converting the fracture forming limit line corresponding to crack opening by mode III in principal strain space into a hyperbolic fracture limit curve in the effective strain vs. stress-triaxiality space. The overall methodology employed by the authors combines experimentation along with analytical and numerical modelling, and the contents of the paper is a step towards diminishing the actual lack of knowledge regarding failure by fracture in bulk metal forming parts subject to stress-triaxiality values beyond uniaxial tension. Results show that a new uncoupled ductile fracture criterion built upon combination of the integrands of the Cockcroft-Latham and McClintock criteria can be successfully used to model the physics of the bulk metal forming limits for the entire range of stress-triaxiality values corresponding to cracking on free surfaces.Sage Publications Ltd.RCIPLSampaio, Rui F. V.Pragana, JoãoBragança, IvoSilva, CarlosMartins, Paulo2022-03-15T13:55:52Z2022-062022-06-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/14472engSAMPAIO, Rui F. V.; [et al] – Revisiting the fracture forming limits of bulk forming under biaxial tension. International Journal of Damage Mechanics. ISSN 1056-7895. Vol. 31, N.º 6 (2022), pp. 882-900.1056-789510.1177/105678952110725801530-7921metadata only accessinfo: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:RCAAP2023-08-03T10:10:41Zoai:repositorio.ipl.pt:10400.21/14472Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:22:16.455829Repositório 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 Revisiting the fracture forming limits of bulk forming under biaxial tension
title Revisiting the fracture forming limits of bulk forming under biaxial tension
spellingShingle Revisiting the fracture forming limits of bulk forming under biaxial tension
Sampaio, Rui F. V.
Bulk forming
Formability tests
Biaxial tension
Ductile fracture
Experimentation
Finite element modelling
title_short Revisiting the fracture forming limits of bulk forming under biaxial tension
title_full Revisiting the fracture forming limits of bulk forming under biaxial tension
title_fullStr Revisiting the fracture forming limits of bulk forming under biaxial tension
title_full_unstemmed Revisiting the fracture forming limits of bulk forming under biaxial tension
title_sort Revisiting the fracture forming limits of bulk forming under biaxial tension
author Sampaio, Rui F. V.
author_facet Sampaio, Rui F. V.
Pragana, João
Bragança, Ivo
Silva, Carlos
Martins, Paulo
author_role author
author2 Pragana, João
Bragança, Ivo
Silva, Carlos
Martins, Paulo
author2_role author
author
author
author
dc.contributor.none.fl_str_mv RCIPL
dc.contributor.author.fl_str_mv Sampaio, Rui F. V.
Pragana, João
Bragança, Ivo
Silva, Carlos
Martins, Paulo
dc.subject.por.fl_str_mv Bulk forming
Formability tests
Biaxial tension
Ductile fracture
Experimentation
Finite element modelling
topic Bulk forming
Formability tests
Biaxial tension
Ductile fracture
Experimentation
Finite element modelling
description The formability limits of bulk metal forming in principal strain space and in the effective strain vs. stress-triaxiality space are characterized by an uncertainty region in which cracks may be triggered by tension (mode I of fracture mechanics) or by out-of-plane shear (mode III). The problem in obtaining experimental data in this region has been known for a long time and the main objective of this paper is to present a new upset formability test geometry that can effectively contribute to the characterization of the formability limits of bulk metal forming parts subjected to biaxial tension. Alongside with this objective, this paper also presents an analytical expression for converting the fracture forming limit line corresponding to crack opening by mode III in principal strain space into a hyperbolic fracture limit curve in the effective strain vs. stress-triaxiality space. The overall methodology employed by the authors combines experimentation along with analytical and numerical modelling, and the contents of the paper is a step towards diminishing the actual lack of knowledge regarding failure by fracture in bulk metal forming parts subject to stress-triaxiality values beyond uniaxial tension. Results show that a new uncoupled ductile fracture criterion built upon combination of the integrands of the Cockcroft-Latham and McClintock criteria can be successfully used to model the physics of the bulk metal forming limits for the entire range of stress-triaxiality values corresponding to cracking on free surfaces.
publishDate 2022
dc.date.none.fl_str_mv 2022-03-15T13:55:52Z
2022-06
2022-06-01T00:00:00Z
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/10400.21/14472
url http://hdl.handle.net/10400.21/14472
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv SAMPAIO, Rui F. V.; [et al] – Revisiting the fracture forming limits of bulk forming under biaxial tension. International Journal of Damage Mechanics. ISSN 1056-7895. Vol. 31, N.º 6 (2022), pp. 882-900.
1056-7895
10.1177/10567895211072580
1530-7921
dc.rights.driver.fl_str_mv metadata only access
info:eu-repo/semantics/openAccess
rights_invalid_str_mv metadata only access
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sage Publications Ltd.
publisher.none.fl_str_mv Sage Publications Ltd.
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
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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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
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