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Influence of fiber glass sizing design on the performance of composites in SAMPE JOURNAL, Vol. 46, N° 6 (11-12/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 6 (11-12/2010) Titre : Influence of fiber glass sizing design on the performance of composites Type de document : texte imprimé Année de publication : 2010 Langues : Américain (ame) Catégories : Composites à fibres -- Moulage par infusion Composites à fibres de verre Eoliennes -- Matériaux Tags : 'Composites  à  fibres  de  verre'  'Taille  des  fibres'  Eolienne  hélices'  Propriétés  mécaniques Index. décimale : 668.4 Plastiques, vinyles Résumé : The global demand for alternative energy sources has resulted in dramatic growth in the use of fiber glass composites for wind blades. As energy cost and efficiency demands drive the need for longer blades, the design and selection of fiber glass sizing systems are critical to optimizing blade building processes and long term fatigue performance of the blade. Experimental results have shown that changes in sizing chemistry on the surface of glass fibers can substantially improve both static and long term composite mechanical properties. In addition, resin infusion rates and finished part quality of wind blades are enhanced by the proper design and selection of fiber glass sizing elements. Performance can be further improved by the proper selection of fiber glass sizing systems in combination with a specific type of resin chemistry. Ongoing research on fiber glass products for wind blades at the PPG Fiber Glass Science and Technology Center is focused on maximizing the mechanical performance for the wind blade market. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10289 [article]

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Composite design software - Gaining currency within the wind industry / Olivier Guillermin in SAMPE JOURNAL, Vol. 46, N° 6 (11-12/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 6 (11-12/2010) . - p. 28-32 Titre : Composite design software - Gaining currency within the wind industry Type de document : texte imprimé Auteurs : Olivier Guillermin, Auteur Année de publication : 2010 Article en page(s) : p. 28-32 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Eléments finis, Méthode des Eoliennes -- Matériaux Modélisation tridimensionnelle Index. décimale : 668.4 Plastiques, vinyles Résumé : The wind energy industry is growing rapidly as a confluence of economic, political and environmental factorshas convinced just about everyone that wind should be part of a comprehensive energy solution. There are a lot of good reasons people feel that way. First, there is the recognition of the need to diversify energy sources and alleviate dependency on fossil fuels. Fossil fuels are in high demand around the globe and are therefore subject to supply issues and volatile pricing. Secondly, the detrimental effect of greenhouse gases and the resultant global warming has become a serious concern for governments and is influencing the legislative agenda. Finally, there is this simple fact : wind is a free, unlimited and pollution-free resource That's a hard combination to beat. While wind energy is generally experiencing healthy growth, it is not moving inlock step across the globe. While it is a proven and mature energy source in a few European countries, such as Denmark, Holland, Germany and Spain, it is a young and growing mariet in North America and an industry that is ramping up at breakneck speed in emerging markets, such as China and India. In addition, attention is turning to the great energy potential held by offshore implementations of large wind farms in many regions, especially Europe. Given the potential for continued strong growth, manufacturers of composite wind turbine blades are looking for new engineering solutions that will enable them to sustain the current pace of demand and to develop high quality products quicker and at ever more competitive prices. Indeed, the average size of a wind turbine keeps growing, requiring longer and lighter blades with more adapted profiles and better performing aerodynamics. While much of the innovation for new blades comes from the wind industry itself, engineers are casting an eye toward other industries that have successfully used high-performance composite materials, advanced manufacturing processes and composite engineering software. Not coincidentally, many new engineers hired at wind turbine engineering companies com from aerospace or aerospace-related companies. That's because wind energy is an exciting and vibrant industry with all kinds of potential for those who have long-term and hard-won composites experience and can use that expertise to deliver innovative solutions for designing and manufacturing turbine blades. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10290 [article]

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Process improvements for the resin transfer molding of composite intake valves for internal combustion engines / D. W. Radford in SAMPE JOURNAL, Vol. 46, N° 6 (11-12/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 6 (11-12/2010) . - p. 41-47 Titre : Process improvements for the resin transfer molding of composite intake valves for internal combustion engines Type de document : texte imprimé Auteurs : D. W. Radford, Auteur ; P. T. Nivala, Auteur Année de publication : 2010 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Matériaux Automobiles -- Moteurs -- Pièces Composites à fibres de carbone Moulage par transfert de résine sous vide Polyimides Index. décimale : 668.4 Plastiques, vinyles Résumé : In previous work, composite intake valves for use in internal combustion (IC) engines were manufactured by resin transfer molding (RTM) and demonstrated in a fully functional IC engine on a dynamometer. These valves consisted of a high temperature polyimide matrix, LaRC PETI-RFI, reinforced with a carbon fiber preform. While this previous work successfully demonstrated the potential for composite intake valves, several issues were noted including excesive surface porosity on a result of inadequate process pressure due to a lack of sealing in the resin transfer die. In the current work, improvements to the sealing of the die have been made in an attempt to evaluate the effectiveness of pressure generated from differential thermal expansion of the polyimide matrix and the die during the cure stage. Additionally, the development of preforms resulting in higher fiber volume fractions, a transition to the lower viscosity polyimide, LaRC PETI-RTM, and the utilization of vacuum-assist during resin transfer molding were investigated to assess the effects on the as-molded surface quality. The results of the processing study suggest that, with continued process development in the areas outlined, high quality, porosity-free composite intake valves can be manufactured by resin transfer molding. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10291 [article]

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