Non-autoclave (prepreg) manufacturing technology for primary aerospace structure / Gail L. Hahn in SAMPE JOURNAL, Vol. 47, N° 1 (01-02/2011)

[article]  inSAMPE JOURNAL > Vol. 47, N° 1 (01-02/2011) . - p. 6-13 Titre : Non-autoclave (prepreg) manufacturing technology for primary aerospace structure Type de document : texte imprimé Auteurs : Gail L. Hahn, Auteur ; Gary G. Bond, Auteur Année de publication : 2011 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Avions -- Matériaux Composites à fibres Fibres de silice Hors autoclave (technologie) Industries aérospatiales Matériaux -- Imprégnation Index. décimale : 668.4 Plastiques, vinyles Résumé : In the past, use of non-autoclave manufacturing technology was limited by processes which provided lower quality than autoclave cured approaches and materials which did not meet the properties or structural life demanded. Non-Autoclave Manufacturing Technology is a program jointly accomplished by a Boeing-led team and the U.S. Government (DARPA) under the guidance of the Air Force to address the challenges to enable disruptive, pervasive use of vacuum-bag-only prepreg for reduced recurring cost and cycle time for primary structures. This paper provides an overview of the expanded program which includes transition and replication to fabricators, material characterization and process modeling, and scale-up studies for several processing/design concepts for primary aerospace structure. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12737 [article]

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Prepreg non-autoclave manufacturing technology : program overview and co-cure enablers for disruptive, pervasive use / Gary G. Bond in SAMPE JOURNAL, Vol. 48, N° 5 (09-10/2012)  

[article]  inSAMPE JOURNAL > Vol. 48, N° 5 (09-10/2012) . - p. 8-15 Titre : Prepreg non-autoclave manufacturing technology : program overview and co-cure enablers for disruptive, pervasive use Type de document : texte imprimé Auteurs : Gary G. Bond, Auteur ; Gail L. Hahn, Auteur ; K. M. Jost, Auteur ; T. Storage, Auteur Année de publication : 2012 Article en page(s) : p. 8-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Hors autoclave (technologie) Matériaux -- Imprégnation Index. décimale : 668.4 Plastiques, vinyles Résumé : In 2007, non-autoclave manufacturing technology was initiated by a boeing-led team and the U.S. government (DARPA) under the guidance of the Air Force to enable disruptive, pervasive use of vacuum-bag-only prepreg for reduced recurring cost and cycle time for primary composite structures. This paper will provide a program overview as well as focusing specifically on composite co-curing technology out of the autoclave. Composite co-cures can be complicated and difficult to repeatedly produce with high quality. Factors that can contribute to these difficulties include autoclave pressure and the flow of the resin. By moving to out-of-autoclave systems, improvements in quality by reducing pressure and resin flow are achievable. Through the DARPA/Boeing co-funded, Air Force guided program non-autoclave manufacturing technology, two different co-cure designs were evaluated. The first was an existing production co-cure utilizing production tooling and engineering but substituting Cytec's toughened epoxy non-autoclave system 5320-1 for the baseline autoclave system. The second non-autoclave co-cure was a new design for a cooling outer aft duct (COAD) that utilized a novel large-scale tooling concept for the co-cured stiffeners. Non-destructive evaluation (ultrasonic inspection) and visual inspection were conducted on both co-cured structures and demonstrated that reduced resin flow and pressure during cure does improve some aspects of co-cure quality. Note de contenu : - EXPERIMENTATION : Program developmental approach - The path to very large structures - Fabrication of complex co-cure production structure (CCPS) - Cooling outer aft duct (COAD) - RESULTS : Complex co-cure production structure (CCPS) results - Cooling outer aft duct (COAD) results En ligne : http://vucoe.drbriansullivan.com/wp-content/uploads/Out-of-Autoclave-SAMPE-artic [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16078 [article]

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A study of non-autoclave prepreg manufacturing technology / Gary G. Bond in SAMPE JOURNAL, Vol. 45, N° 3 (05-06/2009)

[article]  inSAMPE JOURNAL > Vol. 45, N° 3 (05-06/2009) . - p. 6-19 Titre : A study of non-autoclave prepreg manufacturing technology Type de document : texte imprimé Auteurs : Gary G. Bond, Auteur ; J. M. Griffith, Auteur ; Gail L. Hahn, Auteur ; C. Bongiovanni, Auteur ; J. Boyd, Auteur Année de publication : 2009 Article en page(s) : p. 6-19 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Use of non-autoclave manufacturing technology has been limited by processes which provide lower quality than autoclave cured approaches and materials which do not meet the properties or structural life demanded. Non-Autoclave Manufacturing Technology is a program jointly accomplished by a Boeing-led team and the US Gouvernment (DARPA) under the guidance of the Air Force to address the challenges to enable disruptive, persuasive use of vacuum-bag-only prepreg for reduced recurring cost and cycle time for primary structures. The program addresses the following: - Autoclave-like properties with an initial cure temperature of 93°C with vacuum only and free standing post cure at 177°C - Reduced cost/span time tooling family for use in 10-25 units - Processing and tooling to match production, besause the tooling concepts are also production-worthy One key to achieving these goals is a 121°C use, medium tough epoxy prepreg system, representing a third generation of prepreg processed under vacuum pressure only. This article summarizes progress during the first year of the program. Note de contenu : - TECHNICAL EVALUATION : Material evaluation - Processing - Manufacturing/Tooling - Part feature based manufacturing limits - DISCUSSION : Materials - Processing - Manufacturing/Tooling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23272 [article]

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