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Characterization of sheet formability limits using a novel diagonal-cruciform test specimen

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datacite.subject.fosEngenharia e Tecnologia::Engenharia Mecânica
dc.contributor.authorSampaio, Rui F. V.
dc.contributor.authorDias, Eduardo B. G.
dc.contributor.authorViegas, João M. A.
dc.contributor.authorPragana, João P. M.
dc.contributor.authorBragança, Ivo M. F.
dc.contributor.authorSilva, Carlos M. A.
dc.contributor.authorMartins, Paulo A. F.
dc.contributor.authorBragança, Ivo
dc.date.accessioned2026-09-21T09:23:26Z
dc.date.available2026-09-21T09:23:26Z
dc.date.issued2025
dc.description.abstractThis paper introduces an innovative diagonal-cruciform test specimen that significantly enhances the characterization of formability limits in sheet metal forming. The specimen's unique design features a reticular two-dimensional geometric structure, with four triangular arms connecting at the center, which effectively induce biaxial tension stress states when subjected to uniaxial loading. Furthermore, the incorporation of machined spherical cups at its center to locally reduce thickness ensures that damage accumulates in this region. Experimental strain loading paths are captured using digital image correlation (DIC) and analyzed with in-house software developed specifically for research and education on material formability. The software identifies and plots the onsets of necking and fracture in principal strain space, and results prove that the diagonal-cruciform specimen is highly effective in generating stable biaxial tension strain loading paths in C11000 copper sheets, operating under friction-independent conditions without the necessity for specialized testing equipment. The fracture limits are subsequently validated by comparing them against the strain loading paths obtained from a single-point incremental sheet-formed part up to failure. The investigation confirms the versatility and robustness of the novel diagonal-cruciform test specimen for evaluating the formability of C11000 copper sheets and provides valuable insights into its potential application across the broader field of sheet formability characterization.eng
dc.identifier.citationSampaio, R. F. V., Dias, E. B. G., Viegas, J. M. A., Pragana, J. P. M., Bragança, I. M. F., Silva, C. M. A., & Martins, P. A. F. (2025). Characterization of sheet formability limits using a novel diagonal-cruciform test specimen. Advances in Industrial and Manufacturing Engineering, 11, Article 100171. https://doi.org/10.1016/j.aime.2025.100171
dc.identifier.doi10.1016/j.aime.2025.100171
dc.identifier.eissn2666-9129
dc.identifier.urihttp://hdl.handle.net/10400.21/23099
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectDiagonal-cruciform test specimen
dc.subjectFormability
dc.subjectSheet metal forming
dc.subjectDuctile fracture
dc.subjectExperimentation
dc.titleCharacterization of sheet formability limits using a novel diagonal-cruciform test specimenpor
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.issue100171
oaire.citation.titleAdvances in Industrial and Manufacturing Engineering
oaire.citation.volume11
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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