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Design optimization of cruciform specimens for biaxial fatigue loading

2014-10Journal article Restricted access
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dc.contributor.authorBaptista, Ricardo
dc.contributor.authorCláudio, Ricardo A.
dc.contributor.authorReis, Luís
dc.contributor.authorGuelho, I.
dc.contributor.authorFreitas, M.
dc.contributor.authorMadeira, JFA
dc.date.accessioned2015-08-25T13:51:56Z
dc.date.available2015-08-25T13:51:56Z
dc.date.issued2014-10
dc.description.abstractIn order to correctly assess the biaxial fatigue material properties one must experimentally test different load conditions and stress levels. With the rise of new in-plane biaxial fatigue testing machines, using smaller and more efficient electrical motors, instead of the conventional hydraulic machines, it is necessary to reduce the specimen size and to ensure that the specimen geometry is appropriated for the load capacity installed. At the present time there are no standard specimen’s geometries and the indications on literature how to design an efficient test specimen are insufficient. The main goal of this paper is to present the methodology on how to obtain an optimal cruciform specimen geometry, with thickness reduction in the gauge area, appropriated for fatigue crack initiation, as a function of the base material sheet thickness used to build the specimen. The geometry is optimized for maximum stress using several parameters, ensuring that in the gauge area the stress is uniform and maximum with two limit phase shift loading conditions. Therefore the fatigue damage will always initiate on the center of the specimen, avoiding failure outside this region. Using the Renard Series of preferred numbers for the base material sheet thickness as a reference, the reaming geometry parameters are optimized using a derivative-free methodology, called direct multi search (DMS) method. The final optimal geometry as a function of the base material sheet thickness is proposed, as a guide line for cruciform specimens design, and as a possible contribution for a future standard on in-plane biaxial fatigue tests. © 2014, Gruppo Italiano Frattura. All rights reserved.por
dc.identifier.citationBAPTISTA, Ricardo; [et al] – Design optimization of cruciform specimens for biaxial fatigue loading. Frattura ed Integrita Strutturale. ISSN: 1971-8993. Vol. 30 (2014), pp. 118-126por
dc.identifier.doi10.3221/IGF-ESIS.30.16
dc.identifier.issn1971-8993
dc.identifier.urihttp://hdl.handle.net/10400.21/5004
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherGruppo Italiano Fratturapor
dc.subjectBiaxial Fatiguepor
dc.subjectDirect Multisearchpor
dc.subjectIn-plane Testingpor
dc.subjectRenard Seriespor
dc.subjectSpecimen Optimizationpor
dc.titleDesign optimization of cruciform specimens for biaxial fatigue loadingpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage126por
oaire.citation.startPage118por
oaire.citation.titleFrattura ed Integrita Strutturalepor
oaire.citation.volume30por
person.familyNameMadeira
person.givenNameJose Firmino Aguilar
person.identifier.ciencia-id6F1E-DCF0-D6EC
person.identifier.orcid0000-0001-9523-3808
person.identifier.ridN-6918-2016
person.identifier.scopus-author-id7003405549
rcaap.rightsclosedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationd495619a-a6ab-4ff5-8e70-3a1351f934dc
relation.isAuthorOfPublication.latestForDiscoveryd495619a-a6ab-4ff5-8e70-3a1351f934dc

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