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A complete characterization of the fracture forming limits in bulk forming by means of an upset geometry sequence

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dc.contributor.authorSampaio, Rui F. V.
dc.contributor.authorPragana, João P. M
dc.contributor.authorBragança, Ivo M. F.
dc.contributor.authorBragança, I.M.F.
dc.contributor.authorSilva, Carlos M. A.
dc.contributor.authorMartins, Paulo A. F.
dc.date.accessioned2026-09-17T13:45:53Z
dc.date.available2026-09-17T13:45:53Z
dc.date.issued2023
dc.description.abstractThis paper presents an upset geometry sequence to determine the fracture forming limits in a wide variety of strain loading paths ranging from uniaxial compression to equibiaxial tension. The strains at fracture in principal strain space are obtained by combination of digital image correlation and experimental evolutions of the compression force versus time, and their representation in the effective strain versus stress triaxiality space is accomplished by means of a new analytical framework that uses the instantaneous slope of the strain loading paths. Modeling of the experimental strains at fracture by means of an uncoupled ductile fracture criterion built upon combination of the Cockcroft-Latham and McClintock criteria and fractography analysis using a scanning electron microscope allow understanding and characterizing the crack opening modes by shear and tension as well as the uncertainty region inside which mixed crack opening modes are observed. Results confirm that the overall philosophy and objectives underlying the new upset geometry sequence for determining the fracture forming limits in bulk forming resemble those of the Nakajima test that is commonly used in sheet forming.eng
dc.identifier.citationSampaio, R. F. V., Pragana, J. P. M., Bragança, I. M. F., Silva, C. M. A., & Martins, P. A. F. (2023). A complete characterization of the fracture forming limits in bulk forming by means of an upset geometry sequence. The Journal of Strain Analysis for Engineering Design, 58(8), 621–632. https://doi.org/10.1177/03093247231187015
dc.identifier.doi10.1177/03093247231187015
dc.identifier.eissn2041-3130
dc.identifier.urihttp://hdl.handle.net/10400.21/23076
dc.language.isoeng
dc.peerreviewedyes
dc.publisherSage
dc.relationUIDB/50022/2020
dc.relationPTDC/EME-EME/0949/2020.
dc.relationgrant number 2022.12351.BD
dc.relation.hasversionhttps://journals.sagepub.com/doi/10.1177/03093247231187015
dc.rights.uriN/A
dc.subjectBulk forming
dc.subjectDuctile fracture
dc.subjectFormability
dc.subjectAnalytical modeling
dc.subjectFinite element method
dc.titleA complete characterization of the fracture forming limits in bulk forming by means of an upset geometry sequenceeng
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage631
oaire.citation.issue8
oaire.citation.startPage621
oaire.citation.titleThe Journal of Strain Analysis for Engineering Design
oaire.citation.volume58
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameBragança
person.givenNameIvo
person.identifier.ciencia-idAD1C-FCD3-0E95
person.identifier.orcid0000-0001-5409-619X
person.identifier.scopus-author-id55671241900
relation.isAuthorOfPublication7205d347-961d-49ea-a212-a15930de3c41
relation.isAuthorOfPublication.latestForDiscovery7205d347-961d-49ea-a212-a15930de3c41

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