Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application

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dc.contributor.authorInforzato, Diego José
dc.contributor.authorCosta Junior, Paulo Roberto
dc.contributor.authorFernandez, Fernando Ferreira
dc.contributor.authorTravessa, Dilermando Nagle [UNIFESP]
dc.contributor.institutionEmpresa Brasileira de Aeronáutica S.A.
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.date.accessioned2015-06-14T13:44:51Z
dc.date.available2015-06-14T13:44:51Z
dc.date.issued2012-08-01
dc.description.abstractCreep-age forming (CAF) is an interesting process for the airframe industry, as it is able to form or shape panels into smooth, but complex, curvatures. In the CAF process, the ageing cycle of the alloy is used to relax external loads imposed to the part, through creep mechanisms. Those relaxed stresses impose a new curvature to the part. At the end of the process, significant spring back (sometimes about 70%) is observed and the success in achieving the desired form depends on how the spring back can be predicted in order to compensate it by tooling changes. Most of the applications relate to simple (non stiffened) panels. The present work deals with the CAF of aluminum panels for aircraft wing skin application. CAF was performed using vacuum-bagging autoclave technique in small scale complex shape stiffened panels, machined from an AA7475 alloy plate. An analytical reference model from the literature was employed estimate the spring back effect in such panel geometry. This model that deals with simple plates was adapted to stiffened panels using a geometric simplification, resulting in a semi-empirical model. The results demonstrate that CAF is a promising process to form stiffened panels, and the spring back can be roughly estimated through a simple model and few experiments.en
dc.description.affiliationEmpresa Brasileira de Aeronáutica S.A.
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Departamento de Ciência e Tecnologia
dc.description.affiliationUnifespUNIFESP, Depto. de Ciência e Tecnologia
dc.description.sourceSciELO
dc.format.extent596-602
dc.identifierhttp://dx.doi.org/10.1590/S1516-14392012005000080
dc.identifier.citationMaterials Research. ABM, ABC, ABPol, v. 15, n. 4, p. 596-602, 2012.
dc.identifier.doi10.1590/S1516-14392012005000080
dc.identifier.fileS1516-14392012000400018.pdf
dc.identifier.issn1516-1439
dc.identifier.scieloS1516-14392012000400018
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/7221
dc.identifier.wosWOS:000308134300018
dc.language.isoeng
dc.publisherABM, ABC, ABPol
dc.relation.ispartofMaterials Research
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectcreep-age formingen
dc.subjectspring backen
dc.subjectsemi-empirical modelingen
dc.subjectAA7475 alloyen
dc.titleCreep-age forming of AA7475 aluminum panels for aircraft lower wing skin applicationen
dc.typeinfo:eu-repo/semantics/article
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