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Out-of-autoclave sandwich structure : processing study in SAMPE JOURNAL, Vol. 48, N° 4 (07-08/2012)
[article]
Titre : Out-of-autoclave sandwich structure : processing study Type de document : texte imprimé Année de publication : 2012 Article en page(s) : p. 24-31 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Assemblages collés
Collage
Colles:Adhésifs
Composites
Construction sandwich
Hors autoclave (technologie)
Stratifiés
Stratifiés -- Propriétés mécaniques
Structure en nid d'abeillesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Composite sandwich structures offer several advantages such as reduced weight, high bending/torsion stiffness, superior thermal insulation and excellent acoustic damping over conventional structural materials. One failure mechanism in a composite sandwich structure is the debonding of the composite facesheets from the core structure. A well-formed adhesive fillet at the interface of the honeycomb core cell walls and the laminate is a significant factor preventing bond failure. Improved adhesion strength with a well-formed adhesive fillet at the interface of the honeycomb core walls and laminate is the aim of sandwich composite manufacturing, and is one area of investigation in this work. Out-of-autoclave (OOA) processing of composites offers several key benefits compared to autoclave processing such as lower manufacturing cost resulting from a lower capital cost and lower energy consumption. In the present work, the effects of moisturized adhesive film, core type, material system and variable levels of vacuum on adhesive fillet formation are evaluated. Aluminum honeycomb and vented aluminum honeycomb are used as core materials in this study. Two material systems of prepregs and adhesive films, Cycom 5320 prepreg with FM 309-1M adhesive, and MTM45-1 prepreg with MTA-241/PK13 adhesive are used to manufacture the panels and evaluate the performance. A quantitative investigation of the adhesive fillet geometry is carried out for all the panels. Manufactured panels are evaluated for peel strengh and flatwise tensil strength in accordance with ASTM standards. Various combinations of core material, moisture content, material system and vacuum level are evaluated for effects on adhesive strength and adhesive foaming. Note de contenu : - Materials
- Manufacturing
- Statistical analysis
- Performance evaluation : Flatwise tensile strength - Climbing drum peel strength - Photomicrography
- Results and discussion : Flatwise tensile test - Climging drum peel testEn ligne : http://www.nxtbook.com/nxtbooks/sampe/journal_20120708/index.php?startid=24 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15607
in SAMPE JOURNAL > Vol. 48, N° 4 (07-08/2012) . - p. 24-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14011 - Périodique Bibliothèque principale Documentaires Disponible PAEK composite prepreg / Stuart Green in JEC COMPOSITES MAGAZINE, N° 131 (11-12/2019)
[article]
Titre : PAEK composite prepreg : fast and efficient part manufacturing Type de document : texte imprimé Auteurs : Stuart Green, Auteur ; Didier Padey, Auteur ; Gilles Larroque, Auteur ; Justin Merotte, Auteur ; Alexandre Hamlyn, Auteur ; Victorien Merle, Auteur ; Denis Cartier, Auteur Année de publication : 2019 Article en page(s) : p. 70-73 Langues : Anglais (eng) Catégories : Bandes composites
Composites à fibres de carbone -- Propriétés mécaniques
Fibres à orientation unidirectionnelle
Hors autoclave (technologie)
Matériaux -- Imprégnation
Placement automatisé de fibres
Polyaryl éther cétones
Polymères semi-cristallins
Procédés de fabrication
Stratifiés
Technique de la production
Temps de cycle (production) -- RéductionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Coriolis composites and Victrex teamed up to use an automated fibre placement (AFP) process to unlock the potential of VICTREX AE TM 250 UDT. The results showed a significant increase in lay-up speed was possible while achieving industry-acceptable levels of porosity (<2%) for in-situ consolidation. Out-of-autoclave) OoA consolidation showed its potential to reduce the cycle time and energy consumption. Note de contenu : - Automated fibre placement (AFP)
- In-situ consolidation
- Crystallinity (in-situ processing)
- Out-of-autoclave post-processing
- Fig. 1 : VICTREX AE 250 unidirectional carbon fibre-reinforced tape
- Fig. 2 : View of the Coriolis C1 laser assisted AFP head Governing physical mechanisms during laser assisted AFP (adapted from kok, 2018)
- Fig. 3 : Comparison of oven consolidation cycle between VICTREX AE 250 and a conventional high-temperature polymer
- Fig. 4 : Polished optical microsection through an oven-consolidated laminate made from VICTREX AE 250 composite tape laid up on a Coriolis C-Solo machine at 60 m/min. The white circle illustrates the area of polymer flow at a ply-drop. These results are in accordance with CScans performed on entire panels and showing no delamination nor volumetric porosities whatsoever
- Table 1 : In-situ consolidation of VICTREX AE 250 unidirectional tape at constant speed (3 m/min)
- Table 2 : In-situ consolidation of VICTREX AE 250 unidirectional tape at increasing speeds (6-20 m/min)
- Table 3 : Post-consolidation of VICTREX AE 250 unidirectional tape laid-up at increasing speeds (48-60 m/min)
- Table 4 : Mechanical properties comparison between oven-consolidated VICTREX AE 250 composite laminates and press-consolidated laminates against which the data have been normalisedPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33883
in JEC COMPOSITES MAGAZINE > N° 131 (11-12/2019) . - p. 70-73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21273 - Périodique Bibliothèque principale Documentaires Disponible 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)
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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 -- ImprégnationIndex. 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) resultsEn ligne : http://vucoe.drbriansullivan.com/wp-content/uploads/Out-of-Autoclave-SAMPE-artic [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16078
in SAMPE JOURNAL > Vol. 48, N° 5 (09-10/2012) . - p. 8-15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14093 - Périodique Bibliothèque principale Documentaires Disponible Properties and applications of nanosilica-modified tooling prepregs / J. M. Nelson in SAMPE JOURNAL, Vol. 49, N° 1 (01-02/2013)
[article]
Titre : Properties and applications of nanosilica-modified tooling prepregs Type de document : texte imprimé Auteurs : J. M. Nelson, Auteur ; A. M. Hine, Auteur ; D. P. Goetz, Auteur ; P. Sedgwick, Auteur ; R. H. Lowe, Auteur ; E. Rexeisen, Auteur ; R. E. King, Auteur ; C. Aitken, Auteur ; Q. Pham, Auteur Année de publication : 2013 Article en page(s) : p. 7-17 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone -- Propriétés mécaniques
Dureté (matériaux)
Epoxydes
Essais (technologie)
Hors autoclave (technologie)
Matériaux -- Imprégnation
Nanoparticules
Outillage
Résistance des matériaux
SiliceLa silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux.
La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...).
Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale.Index. décimale : 668.4 Plastiques, vinyles Résumé : Recently, 3M has developed a new nanosilica-modified tooling prepreg. Fortified tooling prepreg 140°F epoxy (FTP 140F) is an out-of autoclave/autoclave-curable epoxy system which cures at low temperature and is suitable for high temperature cure cycles. This paper uses this system to examine the effect of incorporating nanosilica into tooling-specific prepreg resins on both resin and carbon fabric composites properties. Nanosilica modification using spherical nanoscale silica produces desirable changes in matrix coefficient of thermal expansion, cure shrinkage, cure exotherm, and hardness, as well as resin mechanical properties including modulus and fracture toughness. Surface hardness is quantified by both macroscale and nanoscale testing. The effect on thermal distortion of curved composite laminates is illustrated. Tooling specific enhancements include improved tool design flexibility, improved tool life, and improved dimensional stability. Real world applications of the materials are featured. Note de contenu : - The development of 3M fortified tooling prepreg 140F epoxy FTP 140F
- EXPERIMENTAL : Materials and resin sample preparation - Carbon fiber composite sample preparation
- RESULTS AND DISCUSSION : Summary and neat resin and composite properties
1. INCREASED DESIGN FLEXIBILITY : Improved tolerances - Reduced springback
2. IMPROVED MANUFACTURING EFFICIENCY : Improved scratch resistance - Exotherm reduction - Efficient tool build
3. TOOL LIFE IMPROVEMENT : Resistance to microcraking - Resistance to delamination - Enhanced flexural modulus after thermal cycling
- APPLICATIONS : Fortified tooling prepreg bismaleimide (FTP-BMI)En ligne : http://www.nxtbook.com/nxtbooks/sampe/journal_20130102/index.php?startid=51#/8 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17775
in SAMPE JOURNAL > Vol. 49, N° 1 (01-02/2013) . - p. 7-17[article]The innovative infusion airframe manufacturing systems (IIAMS) in JEC COMPOSITES MAGAZINE, N° 148 (11-12/2022)
[article]
Titre : The innovative infusion airframe manufacturing systems (IIAMS) Type de document : texte imprimé Année de publication : 2022 Article en page(s) : p. 31-32 Langues : Anglais (eng) Catégories : Avions -- Matériaux
Composites à fibres de carbone
Hors autoclave (technologie)
Placement automatisé de fibres
StratifiésIndex. décimale : 668.4 Plastiques, vinyles Résumé : Along with Airbus Defence and Space, MTorres developed an AFP lay-up system for dry fibre that can be used with high-temperature hot forming and infusion technologie. This project was recognized as the most innovative in the Aerospace - Process category in this year's JEC Composites Innovation Awards. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38319
in JEC COMPOSITES MAGAZINE > N° 148 (11-12/2022) . - p. 31-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23661 - Périodique Bibliothèque principale Documentaires Disponible