Nouveaux Matériaux Légers pour Airframers
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 13:19 | |
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Bnjour! Toujours des infos Titanium, d'Aout celles là ! Le marché au repos, même down de 5% d'aprés les US ! La grève Boeing va encore alléger les tensions, bien que j'ai vu que Boeing maintiens ses appros pour l'instant (Stockage prudent!) 50% du Titane va à l'aviation (Surtout depuis que les Russes ont un peu levé le pied sur leurs sous marins "Titane") ------------Un article d'Aout de Purchasing.com ------------ http://www.purchasing.com/article/CA6584615.html Reduced titanium purchasing in 2008 may just be a bump in the road Long-term projections still show titanium demand on the rise. By Tom Stundza -- Purchasing, 8/14/2008 Purchasing of titanium is stagnating this year, even with prices off somewhat from year-ago levels, mostly because of delays in constructing Boeing's next-generation 787 jet and Airbus'A380. However, purchasing of titanium is expected to increase long-term when airlines accelerate the buy of new fuel-efficient jetliners powered by engines from Rolls-Royce, General Electric and Pratt & Whitney. Longbow Research analyst David MacGregor in Chicago says that titanium producers Allegheny Technologies, Titanium Metals and RTI International Metals have been scrambling to find replacement markets for swelling inventories. There is a lot of titanium metal in the processing and metalworking pipeline because it can take up to 18 months for parts and components to be attached to in-production aircraft. JPRS Paris _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 13:44 | |
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Bonjour ! Contrairement aux prévisions de l'ami Dupont !  Ce n'est pas Boeing qui va arraser la production de Fibres de Carbone ou de Pré-Peg !!! Airbus non plus d'ailleurs !! Mais bien la prochaine entrée, (bien avant 2020) dans le marché automobile du CFRP !!  -------------------------------------------- http://nextbigfuture.com/2008/08/future ... -cars.html Year Carbon Fiber (CF) Market 2007 35,000 tons 2008 40,000 tons 2009 46,000 tons 2010 52,000 tons 2011 60,000 tons 2012 69,000 tons 2015 88,000 tons 70-80% of the CF market is for industrial purposes (10-15% growth in industrial), but the market for aircraft parts is growing the fastest (15-24% growth). The overall market is projected to grow at 10-15% per year. A new and growing CF market will be for car parts and body panels. Using 100kg in 6.5 million cars would see a CF market of 654,000 tons per year in the 2020s. J'ajoute, que, une fois les risques de shortage passés, on pourrait bien voire aussi les prix de la FC baisser drastiquement, avec une production qui se dirigerait vers le million de tonnes !! JPRS Paris (Message édité par Beochien le 13/09/2008 13h54) _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 14:06 | |
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Pour répondre à Alain et Maîtrefollace ! Un procédé Allemand qui mixte rivets (Moins) et collage du CFRP ! Peut être plus sûr que de dépendre d'une couche de crazy glue !! --------------- Extrait ----------------------- http://www.scientificblogging.com/news_ ... _less_fuel Bonding Carbon-Fiber Reinforced Plastics Could Mean Lighter Airplanes (and less fuel) Submitted by News Staff on 8 September 2008 - 12:00am. Aerospace The lighter an aircraft is, the less fuel it consumes. Given the need to cut carbon dioxide emissions, this is a key aspect of materials research. Aircraft manufacturers are therefore pinning their hopes on particularly lightweight construction materials. These include not only lightweight metals, but also fiber composite plastics, particularly carbon-fiber reinforced plastics (CFRPs). Whenever two CFRP components have to be joined together, this has so far been accomplished primarily by riveting. Researchers at the Fraunhofer Institute for Manufacturing Technology and Applied Materials Research IFAM in Bremen are experts in adhesive techniques and plan to enlarge their expertise to include mechanical joining. At the Composites Europe trade fair in Essen, they show a state-of-the-art C-clamp riveting machine (Hall 10-11, Stand 150). This device enables the necessary rivet holes, complete with one- or two-part riveted bolts, to be installed accurately and automatically in compliance with aviation standards. JPRS Paris _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 14:29 | |
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Bonjour! De Suede, Oxeon, fabrique des tissus CF, avec beaucoup moins d'intersctices, réduisant ainsi la présence de résines pour remplir les vides .... et totalement inutile côté résistance! Ces textures sont disponibles pour les Prépeg ! De sérieux gains de poids (Moins d'excés de résine époxy) à espérer ! Avis à Boeing et Airbus !! Il y à pas mal à gratter de ce côté !! Noter quand même que les fabricants de clubs de Golf et de cadres de Vélos, semblent aller plus vite que l'aviation commerciale !! ----------------- Le Site du fabricant -------------- http://www.oxeon.se/index.php?page=product-examples Oxeon provides tailormade fabrics to suit your specific demands. TeXtreme® and TeXero® is tailormade and available in a wide variety of configurations with regard to areal weights, choice of materials, and so on. Please contact our sales department to discuss what will suit your needs. TeXtreme® carbon fabric TeXtreme® carbon fabrics are available in a wide variety of different areal weights (starting from 80 g/m2), fabric widths (300 –1500 mm) constructed from tape widths (20–50 mm) to fully meet specific customer needs. Through cooperation with impregnating companies, TeXtreme® fabrics can be delivered as a thermoset prepreg. TeXtreme® is available, even in low areal weights, as it is produced from the more easily available 12k, 24k or 48k tows. Some examples of TeXtreme® fabrics are shown below. JPRS Paris _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 16:49 | |
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Il n'y a pas que la structure pour les Prépeg ! Les intérieurs aussi !! http://www.eppm.com/x/guideArticle.html?id=32317 Custom Prepregs for Aerospace Interiors Advanced Composites Group (ACG), part of the Composites Division of Umeco, manufactures a range of aircraft interior prepreg materials, which are qualified to Airbus specifications. ACG’s range of prepreg products includes epoxy, phenolic and bismaleimide resin systems that are supplied in a number of different formats, and fibre reinforcements, such as carbon, E, R and S glass. For aircraft interior applications, ACG’s prepreg materials exhibit excellent fire performance characteristics that enable components to meet mandatory regulations, such as the Federal Aviation Authority’s FAR25.853 and Airbus ABD0031 directives. ACG’s phenolic prepregs are widely used in passenger cabin interior applications for components such as side wall and ceiling panels, partitions, and modular fittings, including lavatories, galleys, wardrobes and overhead luggage bins, where they exhibit remarkable stiffness even at minimal weight, which is particularly true for honeycomb-cored parts. ACG’s phenolic prepregs exhibit low heat release, as well as minimal emission of smoke and toxic gasses. ACG also offers prepreg materials exclusively manufactured for other interior fittings, such as seat outer shells and inner structures, air ducting and mixers, cabin and cargo flooring, and cargo liners. Le site conglomerat du fabricant ! http://www.eppm.com/x/user_circulation.html _________________ JPRS |
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TanteJu
Inscrit le 03/01/2007 |
# 13 septembre 2008 19:34 | |
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On peut prendre sur des clubs de golfs des risques concernant la tenue dans le temps la résistance etc mais pour l'aviation il faut être totalement sûr d'abord. Les exigences de la sécurité humaine n'ont strictement rien à voir, cette comparaison est ridicule |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 20:11 | |
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Les matériaux FC tissés sont les mêmes .... La texture change (Intelligemment) et paraît suffisamment au point pour que ce fabriquant Suédois fasse figurer un avion militaire dans son catalogue ! Les prépeg sont apparemment sous traités on peut supposer à des fabricants qualifiés Aviation et avec des époxy de même, quand cela est nécessaire ! C'est bien certain que le marché des cadres de bicyclertte est d'un développement plus instantané aussi ! La remarque de Tante Ju pas forcément circonstanciée ni adaptée à la présentation faite ! Et le mot ridicule est de trop ! JPRS Paris _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 13 septembre 2008 20:57 | |
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Juste pour info concernant Oxeon ! Pour que le ridicule ne tue pas cette fois encore !! http://www.oxeon.se/index.php?page=textreme Aerospace & Aviation Whether you are in the commercial, military or small air craft market, low weight is the key to success. With TeXtreme® you can optimize fiber reinforcement where you need it the most. The braiding process developed by Oxeon AB produces a fibre architecture that offers remarkable structural properties. -------------------- http://www.netcomposites.com/news.asp?1951 At Jec Composites Show 2004, Swedish company Oxeon will introduce Oxeon TeXtreme™, an innovative carbon reinforcement that is achieved by braiding stabilized unidirectional tapes that are 20-50 mm wide. The resulting fibre architecture combines the structural performance of unidirectional fibres with the handling benefits of a woven textile. Oxeon TeXtreme™ offers improved mechanical properties, lower production costs and improved surface smoothness. The material is currently available in 0,90° orientation and will soon be available in ±45° orientation. The main applications are in the automotive, aeronautics, and boat-building sectors. ------------------------ http://www.textileworld.com/Articles/20 ... ition.html TeXtreme® Wins Fiberrik Competition TeXtreme® — a spread tow carbon reinforcement fabric manufactured by Sweden-based Oxeon AB, a producer of tow carbon fiber fabrics — recently was named winner of the Fiberrik competition, a Swedish contest for technical textiles innovations. The jury stated its reasoning behind the decision as follows: “[TeXtreme] is a highly innovative and all textile product within the field of technical textiles with great market potential, now and in the future. The product has already come a long way in its development and commercialization. This technical textile can be used to produce lighter, firmer and stronger composites at a low cost.” TeXtreme carbon fabrics are used in a variety of applications, including aerospace and aviation, sports and consumer goods, racing boats and cars, and industrial applications. Oxeon will invest the 200,000-Swedish-kronor (US$33,134) prize in further weaving technology and product development. June 24, 2008 ----------------------------------- Comme quoi on peutfaire des cadres de bicyclette des clubs de golf et de l'aviation quand on a la techno ! Et que des cadres de vélo peuvent porter plus de techno, qu'un renfort de structure ou de porte bagages étudié par Boeing et ses sous traiotants !! JPRS Paris _________________ JPRS |
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TanteJu
Inscrit le 03/01/2007 |
# 14 septembre 2008 15:09 | |
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le ridicule n'est pas dans l'utilisation d'une technologie par les deux, mais sur l'avance prise par l'industrie du vélo je maintiens il sera toujours plus rapide d'adapter une technologie d'abord pour des produits à moindre exigence de sécurité et donc de tests. |
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TanteJu
Inscrit le 03/01/2007 |
# 14 septembre 2008 15:20 | |
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avant de faire de longues réponses une étude de textes s'impose : quel comparaison y a t-l dans le texte d'origine? A vouloir répondre trop vite on se méprend sur le sens d'un texte |
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Viking
Inscrit le 18/10/2006 |
# 15 septembre 2008 11:26 | |
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Attention aux raccourcis, souvent en compression ou en cas de chocs on est bien content de l'avoir l'interstice avec la résine.... _________________ Merci de ne pas me citer ailleurs.... |
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Beochien
Inscrit le 13/02/2007 |
# 16 septembre 2008 20:24 | |
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Bonsoir Hexcel se noye dans sa fibre de carbone ! Au secours Dupont ! Carbone Fiber Glut à l'horizon ! http://www.marketwatch.com/news/story/h ... siteid=rss Hexcel scales back production due to Boeing strike By Christopher Hinton Last update: 7:25 a.m. EDT Sept. 16, 2008 NEW YORK (MarketWatch) -- About 25% of the Stamford, Conn., manufacturer's sales last year were to Boeing and related subcontractors, according to a Hexcel filing. "Start-up costs for new facilities and inflationary pressures continue to present challenges," said David Berges, chairman and CEO, in a statement late Monday. Hexcel will update its guidance at the end of the third quarter JPRS Paris (Message édité par Beochien le 16/09/2008 20h25) _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 19 septembre 2008 16:19 | |
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bonjour, pour les courageux ! Un long article de composite world, sur les Fan plastoc, dans les Turbo-Fan, documenté GE et Snecma, à lire surtout la fin, pour les comparaisons et gains depoids !! http://www.compositesworld.com/articles ... gines.aspx _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 26 octobre 2008 14:45 | |
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bonjour Les contributions de SKF au A380 (Non daté) Intéressant, pour les composites injectés du wingbox ... Et les roulmements titane des attaches de train semble t'il ! http://www.skf.com/portal/skf_gb/home/s ... tId=511146 The unique requirements of the Airbus 380 resulted in the adoption of many new materials in place of the traditional options of aluminium and steel. For example, SKF developed struts, which are used in the wing boxes, manufactured from composite materials using a resin transfer moulding process. These were supplied in the form of a kit comprising the 143 struts , each around 2.5m in length, along with over 3,000 bolts and ancillary components that were required for the construction of the wing box. The use of these unique materials has allowed the weight of the A380 wing boxes to be reduced by as much as 40% compared with those constructed using conventional materials. In addition, SKF developed and manufactured a new range of lightweight titanium bearings specifically for this application for use in landing gear, pylon attachments and wing assemblies. During the development of these bearings, SKF engineers tested dozens of different material combinations and, in the early stages, were not even certain if titanium could be a feasible material option. The key to producing a viable bearing is the development of a coating to prevent galling, a severe form of adhesive wear which can occur during sliding contact between two surfaces. This is a particular problem with titanium, which has a relatively high coefficient of surface friction combined with low tensile and shear strength. In addition, titanium is prone to oxidation, with the oxide formed as a surface layer that is transferred to the sliding surface, producing wear debris. SKF developed a solution to these problems using two different coatings to eliminate the galling issue and make possible the titanium-to-titanium contact needed for the self-aligning function of the bearings. For the landing gear of the Airbus A380, twelve of the self-aligning spherical bearings, with bronze bushings, were used per aircraft to provide structural attachment between the landing gear and the fuselage, and to facilitate the rotation of the support pivot axis. This cutting edge application resulted in weight savings of over 100Kg, compared with the use of traditional bi-metal, bronze and steel, bearings. JPRS Paris _________________ JPRS |
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Viking
Inscrit le 18/10/2006 |
# 7 novembre 2008 08:18 | |
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http://www.cao.fr/actu/2523/IAO-calculs ... ique-.html Ca avance dans la simulation, il y qq mois j'avais vu une démo de MSC sur du ply by ply failure, sans doute un des modèles les plus avancés de calcul de rupture des "plastocs". _________________ Merci de ne pas me citer ailleurs.... |
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