Floating roller peel test indicates excellent current condition / Heinrich Dinnebier in ADHESION - ADHESIVES + SEALANTS, N° 4/2008 (04/2008)  

[article]  inADHESION - ADHESIVES + SEALANTS > N° 4/2008 (04/2008) . - p. 20-23 Titre : Floating roller peel test indicates excellent current condition Type de document : texte imprimé Auteurs : Heinrich Dinnebier, Auteur ; Jürgen von Czarnecki, Auteur Année de publication : 2008 Article en page(s) : p. 20-23 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Adhésifs dans les avions Assemblages collés Assemblages collés -- Détérioration Avions -- Fuselage Construction sandwich Essais dynamiques Pelage Index. décimale : 668.3 Adhésifs et produits semblables Résumé : 40-year-old sandwich components - The ageing behaviour of adhesive bonds has been the subject of numerous studies, research programmes and component qualification processes, primarily because of the fundamental importance of these bonds for the safety and reliability of the components in question. The outcome of these time-consuming investigations is almost always a series of relatively inconclusive forecasts. Against this background, the results described in this article of studies of samples that have aged over 40 years of practical use are highly interesting. Note de contenu : - Fig. 1 : The Breguet Atlantic Br.1150 maritime long-range reconnaissance plane - Fig. 2 : Fuselage sergment with sandwich construction - Fig. 3 : Floating roller peel device in accordance DIN EN 1464 - Fig. 4 : Roller peel samples made of sandwich components, top : tested sample, below : new component - Fig. 5 : Modified floating roller peel device for testing sandwich components - Fig. 6 : Testing sandwich samples using the modified floating roller peel test - Fig. 7 : The peel force for a sandwich structure in the modified floating roller peel test. Comparison between the samples as they were supplied and after ageing. Sample width : 25 mm - Fig. 8 : Cohesive failure of the adhesive also after exposure En ligne : https://drive.google.com/file/d/1Dr2lSvguGOZk2ImcxeFhq3mfp0chVxMs/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25471 [article]

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High-performance epoxy paste for aircraft applications in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 21, N° 4 (04/2014)  

[article]  inADHESIVES & SEALANTS INDUSTRY (ASI) > Vol. 21, N° 4 (04/2014) Titre : High-performance epoxy paste for aircraft applications : A new structural adhesive for metal and composite aircraft parts reduces cure time and costs Type de document : texte imprimé Année de publication : 2014 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adhésifs -- Propriétés mécaniques Adhésifs dans les avions Adhésifs structuraux Assemblages collés Collage structural Composites -- Collage Epoxydes Hors autoclave (technologie) Résistance au cisaillement Résistance thermique Transition vitreuse Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Primary and secondary structures that comprise modern aircraft are typically combinations of metals and lightweight carbon fiber- or glass fiber-reinforced polymer composites joined using high-performance adhesives. Historically, the adhesive bonding process required joined substrates to be cured in an autoclave to minimize voids and ensure reliable, high-quality parts. This procedure was time consuming as well as capital intensive. Aircraft OEMs are now seeking more cost-effective technologies, such as out-of-autoclave (OOA) curing that can produce parts more inexpensively than those fabricated via conventional autoclave processing. In response to this trend, a new structural paste has been developed—designated Epibond® 100-A/B epoxy adhesive—that is formulated for OOA curing. The toughened epoxy exhibits outstanding mechanical properties at temperatures from sub-ambient to 149°C (300°F) and retains its high glass-transition temperature (Tg) values even after long-term exposure to hot/wet conditions. The advanced material also accommodates the needs of aircraft OEM and repair facilities for adhesives that can be stored at room temperature, are easy handle and apply, and oven cure in 1-5 hours. As a result, the new OOA paste adhesive can decrease labor time and production costs. Note de contenu : - AIRCRAFT ADHESIVE CHEMISTRIES : Resins - Toughening - HardenerS - ADHESIVE HANDLING AND PROCESSING - TESTING CONDITIONS - ADHESIVE PERFORMANCE En ligne : http://www.adhesivesmag.com/articles/92776-advancing-adhesives-high-performance- [...] Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23341 [article]

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Non-destructive evaluation of the mechanical strength of a TA6V4/composite bond using LASAT / Simon Bardy in JEC COMPOSITES MAGAZINE, N° 116 (10/2017)  

[article]  inJEC COMPOSITES MAGAZINE > N° 116 (10/2017) . - p. 58-62 Titre : Non-destructive evaluation of the mechanical strength of a TA6V4/composite bond using LASAT Type de document : texte imprimé Auteurs : Simon Bardy, Auteur ; Mathieu Ducousso, Auteur ; Laurent Berthe, Auteur ; Frédéric Jenson, Auteur ; Nicolas Cuvillier, Auteur Année de publication : 2017 Article en page(s) : p. 58-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésifs dans les avions Assemblages collés -- Propriétés mécaniques Avions -- Conception et construction Avions -- Matériaux Contrôle non destructif Index. décimale : 668.4 Plastiques, vinyles Résumé : In the current context of aircraft weight reduction and considering the trend for lowering production and maintenance costs, the aeronautics industry is promoting the use of adhesive bonds to replace mechanical fasteners. However, the main limitation of structural bonding in the aircraft industry is the ability to certify the good quality of a structural bond in a non-invasive way, i.e. to certify that the bond can resist up to a predefined strength value. Note de contenu : - LASAT PRINCIPLE - EXPERIMENTS : Materials - Laser facility - Procedure - RESULTS : Disbonding thresholds - Time-position diagrams - Free surface velocity measurement - Non-destructive testing - FIGURES : 1. Schematic view of the generation of a laser-induced shockwave in a confined geometry - 2. Laser adhesion test configuration - 3. Front face of a TA6V/composite sample after laser ablation - 4. Summary of laser shots for each configuration with US disbonding diagnostic (green circles - no disbonding detected, red circles - disbonding detected) and disbonding thresholds as black lines (threshold uncertainly is shown with dotted lines) - 5. a) Time-position (X-t) stress diagram ; and b) stress evolution at the epoxy/composite interface in the composite illumination case - 6. a) Time-position (X-t) stress diagram ; and b) stress evolution at the epoxy/composite interface in the TA6V illumination case - 7. Evolution of the free surface velocity with time for composite illumination shots on a weak bond - Temporal resolution = 50 ns - Signals in dotted lines correspond to identified disbonding configurations En ligne : https://drive.google.com/file/d/1HySmF9LIpO3k__ZAT3QvZRNjsHDEYJ6f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29361 [article]

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Non-destructive, quick and visual / Thomas Krell in ADHESION - ADHESIVES + SEALANTS, N° 1/2012 (2012)  

[article]  inADHESION - ADHESIVES + SEALANTS > N° 1/2012 (2012) . - p. 37-41 Titre : Non-destructive, quick and visual : Thermographic testing for adhesive bonding Type de document : texte imprimé Auteurs : Thomas Krell, Auteur ; Michael Wetzel, Auteur ; Jens Holtmannspötter, Auteur Année de publication : 2012 Article en page(s) : p. 37-41 Langues : Multilingue (mul) Catégories : Adhésifs dans les avions Assemblages collés Collage Contrôle non destructif Thermographie Index. décimale : 668.3 Adhésifs et produits semblables Résumé : In comparison to other non-destructive test methods thermography offers several special advantages. The benefits for adhesive bonding can be exemplary verified by results of non-destructive testing of delaminated components and by passive thermographic investigations of a research project for the development of contamination-tolerant adhesive bonding processes. Note de contenu : - Passive or active thermography - Example 1 : Testing of aircraft main gear flap - Example 2 : Testing of a rotor blade - Example 3 : Investigation of cavitation structures En ligne : https://drive.google.com/file/d/1ADkewo0ifrJsD-W8Nc73m0ldILvDCfj4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25443 [article]

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