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Infused carbon-fiber spar demonstration in megawatt-scale wind turbine blades / D. A. Griffin in SAMPE JOURNAL, Vol. 45, N° 5 (09-10/2009)

[article]  inSAMPE JOURNAL > Vol. 45, N° 5 (09-10/2009) . - p. 6-16 Titre : Infused carbon-fiber spar demonstration in megawatt-scale wind turbine blades Type de document : texte imprimé Auteurs : D. A. Griffin, Auteur Année de publication : 2009 Article en page(s) : p. 6-16 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de carbone Eoliennes -- Matériaux Pales d'éoliennes Index. décimale : 668.4 Plastiques, vinyles Résumé : This article summarizes the development and structural testing of a 30-m prototype wind turbine blade using infused carbone fibers for the primary structural spar. The design, construction and testing of the 30-m blade was completed under a phase-II small business innovation research (SBIR) grant. However, the development of thi prototype included numerous previous research projects concerning the application of carbon fibers to wind turbine blades, including a multi-year program of coupon and-sub-scale testing funded through Sandia National Laboratories. This paper begins with a review ofthe historic trends and current industry status concerning carbon fiber usage in wind turbine blades. Results from earlier research programs are reviewed in the context of their influence on the development of the 30-m prototype. Data for the 30-m development process are presented, including configurations considered and associated trade-off studies on material and process combinations. The final design and manufacturing concept of the 30-m blade is presented. Static testing of the blade was conducted at the National Wind Technology center (NWTC) in september, 2007, and the blade failed below design expectations. The paper presents these results, as well as insights gained through post-mortem inspections of the blade. Conclusions are drawn concerning the performance of the carbon-fiber material in the as built blade, including potential process/tooling improvements that would allow the material to reach its expected performance level. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7156 [article]

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Computational approach for composite material allowables using sealed envelope predictions for reduced testing / Galib Abumeri in SAMPE JOURNAL, Vol. 45, N° 5 (09-10/2009)

[article]  inSAMPE JOURNAL > Vol. 45, N° 5 (09-10/2009) . - p. 26-35 Titre : Computational approach for composite material allowables using sealed envelope predictions for reduced testing Type de document : texte imprimé Auteurs : Galib Abumeri, Auteur ; M. Garg, Auteur ; Frank Abdi, Auteur ; A. McCloskey, Auteur ; R. Bohner, Auteur Année de publication : 2009 Article en page(s) : p. 26-35 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Composites  polymères'  'Simulation  par  ordinateur'  'Tests  réduits'  'Résistance  des  matériaux' Index. décimale : 668.4 Plastiques, vinyles Résumé : Accurate prediction of 1- and B-basis material allowables is essential for statistical characterization and risk reduction of structural aerospace materials. Current practices for determining allowables for polymer composites follow recommended procedures set forth by CMH-17 (formerly military handbook MIL-HKBK-17-1E) and FAA. The process is costly and time consuming as accurate determination of allowables requires physical testing of a large number of coupons for various layup configurations and test environments. Further, new composite materials are introduced to the market at a rapid rate amplyfying the need for timely cost effective approach. To mitigate time and cost associated with material allowable generation, Alpha STAR Corporation (ASC) and Northrop Grumman (NG) are cooperating in an effort to explore a novel computational method for predicting B-basis strength valeus of polymer matrix composites. The approach combines composites mechanics based progressive failure analysis (PFA), finite element analysis, probabilistic methods, and reduced testing to virtually generate coupon tests. To examine the validity of this approach the ASC-NG team used a "sealed envelope" process. Here, ASC made its predictions independent of test results and then handed them to NG for comparison against a "sealed envelope" of real test data. B-basis tensile strength values for un-notched and notched IM7/MTM45-1 coupons were predicted (using a reduced number of test replicates) and provided to the NG team. Predicted results were compared to those obtained using standard military specification practices and the standard number of test replicates. This computational approach has potential for simulation of all types of ASTM tests under various environmental conditions, potentially reducing the required number of test replicates by more than 67 %. The difference in the B-basis results obtained from prediction and those from current practices ranged from -5,8 % and -7,95 %. The average difference between th two results was less than -0,2 %. The difference between the two solutions was less than 1 % for 30 % of the test cases simulated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7194 [article]

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Composites reinforcement fibers : I - The glass family / Scott W. Beckwith in SAMPE JOURNAL, Vol. 45, N° 5 (09-10/2009)

[article]  inSAMPE JOURNAL > Vol. 45, N° 5 (09-10/2009) . - p. 36-37 Titre : Composites reinforcement fibers : I - The glass family Type de document : texte imprimé Auteurs : Scott W. Beckwith, Auteur Année de publication : 2009 Article en page(s) : p. 36-37 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres de verre Index. décimale : 668.4 Plastiques, vinyles Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7195 [article]

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