Fabrication and mechanical characterization of carbon nanotube yarns, 3-D braids, and their composites / Alexander Bogdanovich in SAMPE JOURNAL, Vol. 43, N° 1 (01-02/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 1 (01-02/2007) . - p. 6-19 Titre : Fabrication and mechanical characterization of carbon nanotube yarns, 3-D braids, and their composites Type de document : texte imprimé Auteurs : Alexander Bogdanovich, Auteur ; Philip Bradford, Auteur ; Shaoli Fang, Auteur ; Mei Zhang, Auteur ; Ray H. Baughman, Auteur ; Samuel Hudson, Auteur Année de publication : 2007 Article en page(s) : p. 6-19 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Multi-wall carbon nanotubes are used in this work as building blocks in processing twisted continuous yarns, which are further converted into multi-ply yarns, 3-D braids and 3-D weaves. It is demonstrated, for the first time that 3-D micro-braids can be made solely of continuous carbon nanotube yarns and used as reinforcement for composites. An updated draw-twist method for processing long continuous “single” yarns from multi-wall carbon nanotube forest is described. Then, five single yarns are plied together with opposite direction of twist relative to that in the single yarns, and this forms a five-ply nanotube yarn. Further, 5 such five-ply yarns are plied together with twist to form a 25-ply nanotube yarn. Also, 36 such five-ply yarns are used in fabrication of 3-D braid on special micro-braiding device. The second part of the paper presents comprehensive experimental studies of the multi-ply nanotube yarns, 3-D braids, and their reinforced micro-composites. Various approaches are developed for the nanotube yarn and nanotube braid diameter and cross-sectional area measurements using SEM images. Tensile test data of five-ply yarns, 25-ply yarns and 3-D braids are presented and discussed. Finally, composite micro-samples are made using the aforementioned yarns and braids with several epoxy resins dramatically differing in their viscosity. Their tensile mechanical properties (modulus, strength and ultimate strain) are obtained and analyzed. A thorough discussion about possible ways to improve mechanical properties of carbon nanotube yarns, braids and their composites concludes the paper. Note de contenu : - Fabrication of carbon nanotube yarns - 3-D braiding of carbon nanotube yarns - 3-D weaving with nanotube yarns and 3-D braids - Tensile testing of carbon nanotube yarns and braids - Fabrication of nanotube yarn and braid composites - Tensile testing of nanotube yarn and braid composites Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23440 [article]

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High performance 3-D braided fiber preforms : design and manufacturing advancements for complex composite structures / Dmitri Mungalov in SAMPE JOURNAL, Vol. 43, N° 6 (11-12/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 6 (11-12/2007) . - p. 53-60 Titre : High performance 3-D braided fiber preforms : design and manufacturing advancements for complex composite structures Type de document : texte imprimé Auteurs : Dmitri Mungalov, Auteur ; Patrick Duke, Auteur ; Alexander Bogdanovich, Auteur Année de publication : 2007 Article en page(s) : p. 53-60 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Commercial success of 3-D braiding technology highly depends on the availability of automated, high production speed, industrial scale machines, which should be rebust, affordable, and enable manufacturing of complex, sufficiently large cross section preforms. Recent advancements in design and manufacture of 3-D braided products made on 3TEX's 3-D rotary braiding machines are described in this paper. The development computerized pattern of the rotary 3-D braiding processes for specific applications enable to predict and optimize desirable shapes and geometric parameters of the preforms, volume fraction of braided and axial fibers, and their distribution among different reinforcement directions. Two specific groups of products are in the focus of this paper : large cross section integral carbon fiber Hat-stiffeners primarily aimed at aircraft applications, and carbon or glass fiber truss-like integral structures for potential aerospace, marine and civil engineering applications. The first group of products demonstrates continuous fiber reinforcement throughout the Hat-stiffeners preform, with no "noodle regions" or other sites vulnerable to premature failure. The second group of products demonstrates new capabilities of 3-D braided to provide integral ultra-light-weight cylindrical and flat truss preforms with different cell geometry. The fabricant approaches used for consolidation of both groups of novel 3-D braided composites and some of their basic characteristics are described in the paper. Note de contenu : - New types of 3-D braided preforms - Fabrication of 3-D braided composite hat-beams Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23203 [article]

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