Dépouillements

Stretch broken carbon fiber (SBCF) preforms : dry forming internal structural stiffeners / Michael McClain in SAMPE JOURNAL, Vol. 43, N° 6 (11-12/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 6 (11-12/2007) . - p. 6-9 Titre : Stretch broken carbon fiber (SBCF) preforms : dry forming internal structural stiffeners Type de document : texte imprimé Auteurs : Michael McClain, Auteur ; Joe Goering, Auteur Année de publication : 2007 Article en page(s) : p. 6-9 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : To increase the cost efficiencies of 3D woven preforms, the preferred weaving method is linear. This weaving method, in conjunction with the continuous nature of the fiber and the 3-D architecture, limits the use of these preforms in complex geometries. Stretch Broken Carbon Fiber (SBCF) eliminates the continuous fiber restrain without reducing the effective properties of the fiber bundle while skillful architecture design opens up new applications. Albany Engineered Composites (AEC), in conjunction with team members, utilized a building block approach to define fiber architectures that enhanced the formability of preforms. One such architecture was incorporated into a fiber preform known as a Ï€ clip. This preform shall be used as the flange of a demonstration component, representative of an internal structural member. The component shall be resin transfer molded at AEC in the future. Note de contenu : - APPROACH - OBSERVATIONS : Processing observation - Tow size - SBCF length - Water based sizing - Formability Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23195 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008331	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A review of aligned discontinuous carbon fiber systems for composites forming / Stanley J. Ng in SAMPE JOURNAL, Vol. 43, N° 6 (11-12/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 6 (11-12/2007) . - p. 17-20 Titre : A review of aligned discontinuous carbon fiber systems for composites forming Type de document : texte imprimé Auteurs : Stanley J. Ng, Auteur ; Raymond J. Meilunas, Auteur Année de publication : 2007 Article en page(s) : p. 17-20 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : Production costs for advanced composite aerospace components are directly related to part complexity. Touch labor content is substantial when parts with high levels of double curvature are fabricated by conventional hand lay up and autoclave cure. Automated forming processes have reduced the labor content of production parts with commensurable cost saving. However, such progresses are also limited by the level of double curvature present, as the tendency toward laminate wrinkling increases with part complexity. New material systems, based on aligned, discontinuous carbon fiber forms, offer the potential to increase the part of complexity spectrum available to these cost efficient automated forming processes. By offering additional deformation mechanisms, associated with fiber axis stretching, these materials alleviate in-plane and interply shearing requiments that constitute the principal process limitations of continuous fiber systems. This paper provides an overview of past and recent developement of this new class of material for composites forming. Examples of these material systems include LDF/PEKK, SBCF and Discotex. Note de contenu : - Aligned discontinuous fiber systems - Hexcel Corporation - Northrop Grumman Corporation (NGC) - Applied Research Lab/Pennsylvania State University (ARL/PSU) - Albany International Techniweave, Inc. (AITI) - University of Maryland - NAVAIR - Sikorsky Aerospace Company (SAC) Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23196 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008331	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Polymer and aligned carbon nanotube nanocomposites and nanodevices / Liangti Qu in SAMPE JOURNAL, Vol. 43, N° 6 (11-12/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 6 (11-12/2007) . - p. 38-46 Titre : Polymer and aligned carbon nanotube nanocomposites and nanodevices Type de document : texte imprimé Auteurs : Liangti Qu, Auteur ; Wei Chen, Auteur ; Liming Dai, Auteur Année de publication : 2007 Article en page(s) : p. 38-46 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : We have previously developed a simple pyrolytic method for large-scale production of aligned carbon nanotube arrays perpendicular to the substrate. These aligned carbon nanotube arrays can be transferred onto various substrates of particular interest in either a patterned or non-patterned fashion. The well-aligned structure provides additional advantages for not only an efficient device construction but also surface functionalization (both the inner and outer wall). The surface functionalization of aligned carbon nanotubes is particularly attractive, as it allows surface characteristics of the aligned carbon nanotubes to be tuned to meet specific requirements for particular applications while their alignment structure can be largely retained. These aligned carbon nanotubes with tunable surface characteristics are of great significance to various practical applications, including nanotube sensors and optoelectronics. For instance, we have previously immobilized glucose oxidase (GOX) onto the aligned multi-wall carbon nanotube arrays by electropolymerization of pyrrole in the presence of GOX. The resultant GOX-containing polypyrrole-carbon nanotube coaxial nanowires were shown to be promising new sensing active materials for making advanced glucose sensors with a high sensitivity. Also, singlestrand DNA chains have recently been chemically grafted onto aligned carbon nanotube electrodes, leading to novel aligned carbon nanotube-DNA sensors of a high sensitivity and selectivity for probing complementary DNA and target DNA chains of specific sequences. More recently, we have also developed a rational approach to partially coat perpendicularly- aligned carbon nanotube arrays with an appropriate polymer thin film along their tube length to create synergetic effects, which provide the basis for developing novel sensors for the detection of chemical vapors, thermal and mechanical stimuli with a high sensitivity, good selectivity, excellent environmental stability, and low power consumption. In this talk, we will summarize our work on the preparation of polymer and aligned carbon nanotube nanocomposites and nanodevices. Potential applications of polymer and aligned carbon nanotube nanocomposites in other areas will also be discussed. Note de contenu : - Composites of aligned CNTs with conducting polymers - Composites of aligned CNTs with DNA - Composites of region-confined aligned CNTs with polymers Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23201 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008331	-	Périodique	Bibliothèque principale	Documentaires	Disponible

SAMPE bridge panel efficiency prediction / Manab Medhi in SAMPE JOURNAL, Vol. 43, N° 6 (11-12/2007)

[article]  inSAMPE JOURNAL > Vol. 43, N° 6 (11-12/2007) . - p. 50-51 Titre : SAMPE bridge panel efficiency prediction Type de document : texte imprimé Auteurs : Manab Medhi, Auteur ; Doug Cutlip, Auteur ; Ayman Bataineh, Auteur Année de publication : 2007 Article en page(s) : p. 50-51 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 668.4 Plastiques, vinyles Résumé : The following method is used in predicting the failure strenght of the bridge panel fabricated for the SAMPE bridge design competition. The method used, is out of a literature review and references are mentioned at the end for reader's assistance. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23202 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008331	-	Périodique	Bibliothèque principale	Documentaires	Disponible

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]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
008331	-	Périodique	Bibliothèque principale	Documentaires	Disponible