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Optimization of cruciform specimens for biaxial fatigue loading with direct multi search

2015-12Journal article Restricted access
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dc.contributor.authorBaptista, R.
dc.contributor.authorClaudio, R. A.
dc.contributor.authorReis, L.
dc.contributor.authorMadeira, JFA
dc.contributor.authorGuelho, I.
dc.contributor.authorFreitas, M.
dc.date.accessioned2016-04-15T14:23:30Z
dc.date.available2016-04-15T14:23:30Z
dc.date.issued2015-12
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 appropriate 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, appropriate 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 distributions on the loading directions are uniform and maximum with two limit phase shift loading conditions (delta = 0 degrees and (delta = 180 degrees). 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 testspt_PT
dc.identifier.citationBAPTISTA, R.; [et al.] - Optimization of cruciform specimens for biaxial fatigue loading with direct multi search. Theoretical and Applied Fracture Mechanics. ISSN.0167-8442. Vol. 80, SI, A (2015), pp. 65-72.pt_PT
dc.identifier.doi10.1016/j.tafmec.2015.06.009pt_PT
dc.identifier.issn0167-8442
dc.identifier.issn1872-7638
dc.identifier.urihttp://hdl.handle.net/10400.21/6000
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevier Science BVpt_PT
dc.relation.ispartofseriesA
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0167844215201644pt_PT
dc.subjectBiaxial fatiguept_PT
dc.subjectIn-plane testingpt_PT
dc.subjectSpecimen optimizationpt_PT
dc.subjectDirect multisearchpt_PT
dc.subjectRenard seriespt_PT
dc.titleOptimization of cruciform specimens for biaxial fatigue loading with direct multi searchpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage72pt_PT
oaire.citation.issueSIpt_PT
oaire.citation.startPage65pt_PT
oaire.citation.volume80pt_PT
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.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd495619a-a6ab-4ff5-8e70-3a1351f934dc
relation.isAuthorOfPublication.latestForDiscoveryd495619a-a6ab-4ff5-8e70-3a1351f934dc

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