Fabrication and testing of durable redundant and fluted-core joints for composite sandwich structures / S.-Y. Lin in SAMPE JOURNAL, Vol. 49, N° 4 (07-08/2013)

[article]  inSAMPE JOURNAL > Vol. 49, N° 4 (07-08/2013) . - p. 30-39 Titre : Fabrication and testing of durable redundant and fluted-core joints for composite sandwich structures Type de document : texte imprimé Auteurs : S.-Y. Lin, Auteur ; S. C. Splinter, Auteur ; C. Tarkenton, Auteur ; D. A. Paddock, Auteur ; S. S. Smeltzer, Auteur ; S. Ghose, Auteur ; J. C. Guzman, Auteur ; D. A. McCarville, Auteur ; D. J. Sutkus, Auteur Année de publication : 2013 Article en page(s) : p. 30-39 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité) Assemblages (technologie) Construction sandwich -- Propriétés mécaniques Contraintes (mécanique) Essais dynamiques Industries aérospatiales -- Matériaux Polytétrafluoréthylène Structure en nid d'abeilles Traction (mécanique) Index. décimale : 620.19 Autres matériaux Résumé : The development of durable bonded joint technology for assembling composite structures is an essential component of future space technologies. White NASA is working toward providing an entirely new capability for human space exploration beyond low Earth orbit, the objective of this project is to design, fabricate, analyze, and test a NASA patented durable redundant joint (DRJ) and a NASA/Boeing co-designed fluted-core joint (FCJ). The potential applications include a wide range of sandwich structures for NASA's future launch vehicles. Three types of joints were studied — splice joint (SJ, as baseline), DRJ, and FCJ. Tests included tension, after-impact tension, and compression. Teflon strips were used at the joint area to increase failure strength by shifting stress concentration to a less sensitive area. Test results were compared to those of pristine coupons fabricated utilizing the same methods. Tensile test results indicated that the DRJ design was stiffer, stronger, and more impact resistant than other designs. The drawbacks of the DRJ de¬sign were extra mass and complex fabrication processes. The FCJ was lighter thon the DRJ but less impact resistant. With barely visible but detectable impact damages, all three joints showed no sign of tensile strength reduction. No compression test was conducted on any impact-damaged sample due to limited scope and resource. Failure modes and damage propagation were also studied to support progressive damage modeling of the Si and the DRJ. Note de contenu : - DESIGN AND FABRICATION : Design features - Durable redundant joint (DRJ) - Fluted-Core joint (FCJ) - Fabrication - EXPERIMENTATION - RESULTS : SJ tensile test - DRJ tension test - Tension test with impact damage - SJ and DRJ compression test - Fluted-core compression test Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18941 [article]

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Manufacturing overview of a 2.4 mater (7.9 foot) composite cryotank / D. A. McCarville in SAMPE JOURNAL, Vol. 49, N° 5 (09-10/2013)

[article]  inSAMPE JOURNAL > Vol. 49, N° 5 (09-10/2013) . - p. 7-13 Titre : Manufacturing overview of a 2.4 mater (7.9 foot) composite cryotank Type de document : texte imprimé Auteurs : D. A. McCarville, Auteur ; J. C. Guzman, Auteur ; J. L. Sweetin, Auteur ; J. R. Jackson, Auteur ; L. Pelham, Auteur ; J. Steenland, Auteur ; C. W. Petersen, Auteur Année de publication : 2013 Article en page(s) : p. 7-13 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Avions -- Matériaux Composites à fibres Contrôle non destructif Hors autoclave (technologie) Industries aérospatiales -- Matériaux Procédés de fabrication Réservoirs (récipients) -- Conception et construction Stratifiés Index. décimale : 620.11 Matériaux (propriétés, résistance) Résumé : As part of the Space Technology Game Changing Development Program (GCDP) Composite Cryotank Technology Development (CCTD) contract, Boeing fabricated a 2.4 m diameter test article as a precursor to a 5.5 meter cryotank design, fabrication, and test. This component encompasses several challenging design features: (a) one-piece co-cured/co-bonded spherical geometry with integral skirts, (b) out-of-autoclave curing materials, (c) permeation resistant thin/hybrid ply laminate skins, and (d) thin and thick off-angle slit tape (tow) construction. The component was built on a 24 piece collapsible composite tool using robotic fiber placement. This paper details the tooling and manufacturing flow with an emphasis on process development building block activities. Cessons leamed are compiled that will be used to help guide the build of a 5.5 m diameter tank during the next phase of the CCTD contract. Note de contenu : - INTRODUCTION : CCTD program background - Cryotank design overview - Cryotank manufacturing overview - PRECURSOR TANK TOOLING : Tank tool design - Spindle and skirt tooling - Tank tool fabrication - PRECURSOR MANUFACTURING : Manufacturing summary - Facilities and equipment - Tank automated fiber placement - Fluted core manufacture - Cryotank nondestructive inspection Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19262 [article]

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