Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNIFESP |
Texto Completo: | http://repositorio.unifesp.br/handle/11600/7221 http://dx.doi.org/10.1590/S1516-14392012005000080 |
Resumo: | Creep-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. |
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Inforzato, Diego JoséCosta Junior, Paulo RobertoFernandez, Fernando FerreiraTravessa, Dilermando Nagle [UNIFESP]Empresa Brasileira de Aeronáutica S.A.Universidade Federal de São Paulo (UNIFESP)2015-06-14T13:44:51Z2015-06-14T13:44:51Z2012-08-01Materials Research. ABM, ABC, ABPol, v. 15, n. 4, p. 596-602, 2012.1516-1439http://repositorio.unifesp.br/handle/11600/7221http://dx.doi.org/10.1590/S1516-14392012005000080S1516-14392012000400018.pdfS1516-1439201200040001810.1590/S1516-14392012005000080WOS:000308134300018Creep-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.Empresa Brasileira de Aeronáutica S.A.Universidade Federal de São Paulo (UNIFESP) Departamento de Ciência e TecnologiaUNIFESP, Depto. de Ciência e TecnologiaSciELO596-602engABM, ABC, ABPolMaterials Researchcreep-age formingspring backsemi-empirical modelingAA7475 alloyCreep-age forming of AA7475 aluminum panels for aircraft lower wing skin applicationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESPORIGINALS1516-14392012000400018.pdfapplication/pdf6414452${dspace.ui.url}/bitstream/11600/7221/1/S1516-14392012000400018.pdfac4d98472a3d5d160378e3a17591a727MD51open accessTEXTS1516-14392012000400018.pdf.txtS1516-14392012000400018.pdf.txtExtracted texttext/plain25849${dspace.ui.url}/bitstream/11600/7221/9/S1516-14392012000400018.pdf.txtda2bf6f0dfe06c26e36da0a894ac8cfbMD59open accessTHUMBNAILS1516-14392012000400018.pdf.jpgS1516-14392012000400018.pdf.jpgIM Thumbnailimage/jpeg6863${dspace.ui.url}/bitstream/11600/7221/11/S1516-14392012000400018.pdf.jpg52200f79be83e60ae05d0d375351290bMD511open access11600/72212023-06-05 19:05:59.748open accessoai:repositorio.unifesp.br:11600/7221Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestopendoar:34652023-06-05T22:05:59Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false |
dc.title.en.fl_str_mv |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
title |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
spellingShingle |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application Inforzato, Diego José creep-age forming spring back semi-empirical modeling AA7475 alloy |
title_short |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
title_full |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
title_fullStr |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
title_full_unstemmed |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
title_sort |
Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application |
author |
Inforzato, Diego José |
author_facet |
Inforzato, Diego José Costa Junior, Paulo Roberto Fernandez, Fernando Ferreira Travessa, Dilermando Nagle [UNIFESP] |
author_role |
author |
author2 |
Costa Junior, Paulo Roberto Fernandez, Fernando Ferreira Travessa, Dilermando Nagle [UNIFESP] |
author2_role |
author author author |
dc.contributor.institution.none.fl_str_mv |
Empresa Brasileira de Aeronáutica S.A. Universidade Federal de São Paulo (UNIFESP) |
dc.contributor.author.fl_str_mv |
Inforzato, Diego José Costa Junior, Paulo Roberto Fernandez, Fernando Ferreira Travessa, Dilermando Nagle [UNIFESP] |
dc.subject.eng.fl_str_mv |
creep-age forming spring back semi-empirical modeling AA7475 alloy |
topic |
creep-age forming spring back semi-empirical modeling AA7475 alloy |
description |
Creep-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. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-08-01 |
dc.date.accessioned.fl_str_mv |
2015-06-14T13:44:51Z |
dc.date.available.fl_str_mv |
2015-06-14T13:44:51Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
Materials Research. ABM, ABC, ABPol, v. 15, n. 4, p. 596-602, 2012. |
dc.identifier.uri.fl_str_mv |
http://repositorio.unifesp.br/handle/11600/7221 http://dx.doi.org/10.1590/S1516-14392012005000080 |
dc.identifier.issn.none.fl_str_mv |
1516-1439 |
dc.identifier.file.none.fl_str_mv |
S1516-14392012000400018.pdf |
dc.identifier.scielo.none.fl_str_mv |
S1516-14392012000400018 |
dc.identifier.doi.none.fl_str_mv |
10.1590/S1516-14392012005000080 |
dc.identifier.wos.none.fl_str_mv |
WOS:000308134300018 |
identifier_str_mv |
Materials Research. ABM, ABC, ABPol, v. 15, n. 4, p. 596-602, 2012. 1516-1439 S1516-14392012000400018.pdf S1516-14392012000400018 10.1590/S1516-14392012005000080 WOS:000308134300018 |
url |
http://repositorio.unifesp.br/handle/11600/7221 http://dx.doi.org/10.1590/S1516-14392012005000080 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.none.fl_str_mv |
Materials Research |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
dc.format.none.fl_str_mv |
596-602 |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
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reponame:Repositório Institucional da UNIFESP instname:Universidade Federal de São Paulo (UNIFESP) instacron:UNIFESP |
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Repositório Institucional da UNIFESP |
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