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Electrically-heated ceramic composite tooling for out-of-autoclave manufacturing of large composite structures in SAMPE JOURNAL, Vol. 47, N° 4 (06-07/2011)
[article]
Titre : Electrically-heated ceramic composite tooling for out-of-autoclave manufacturing of large composite structures Type de document : texte imprimé Année de publication : 2011 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminosilicates
Composites à fibres de carbone
Composites à fibres de verre
Composites thermoplastiques
Eoliennes -- Matériaux
Fibres continues
Hors autoclave (technologie)
Industries aérospatiales
Matériaux céramiques
Moules d'injection
Outillage
Polybutylène téréphtalate
Polyéther éther cétone
ThermodurcissablesIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper describes the development of electrically-heated ceramic composite tooling, aimed primarily at the manufacture of large composites structures, for aerospace or for wind energy. The tooling is designed to operate at temperatures up to 300°C, but has the potential to be used at temperatures up to 500°C and above. The ceramic material is an aluminosilicate material, reinforced by continuous fibres and thermoplastic polymer, and laid up with embedded electrical heaters. The ceramic and reinforcing layers are laid up by hand at room temperature, on a standard pattern and cured initially to 60°C, followed by a free-standing post-cure, in stages to approximately 400°C. Special-purpose gel-coats and surface sealing layers are employed to ensure a smooth, vacuum-tight surface. The tooling is lightweight, strong and durable, and has a low coefficient of thermal expansion. Electrical heating power per square metre of tool surface is typically between 5.0 and 15.0 KW/sq.m. Examples are given of the use of the tooling to manufacture 12.6 metre long glass-fibre/epoxy and glass-fibre/PBT wind turbine blades (250KW machine). Aerospace carbon-fibre epoxy prepregs are also processed on the tooling successfully. In all cases, the materials need to be processed between 180°C and slightly above 200°C. The integrally-heated ceramic composite tooling provides a more cost-effective tooling system for processing thermoplastic or thermoset composites at these temperatures than standard metal tooling. Note de contenu : - Reinforced ceramic composite tooling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12728
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Code-barres Cote Support Localisation Section Disponibilité 013151 - Périodique Bibliothèque principale Documentaires Disponible Electron booster for electric vehicles / Michal Danek in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2022)
[article]
Titre : Electron booster for electric vehicles : Irradiation crosslinking replaces high-performance plastics with cheaper polymers Type de document : texte imprimé Auteurs : Michal Danek, Auteur ; Wilhelm Schneider, Auteur Année de publication : 2022 Article en page(s) : p. 14-17 Langues : Anglais (eng) Catégories : Composites à fibres de verre
Matières plastiques dans les automobiles
Polyamide 6
Réticulation sous rayonnement électronique
Véhicules électriquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The conditions in electric vehicles place high demands on the materials used. Therefore, automakers and suppliers must resort to expensive, high-performance plastics. For many applications, cost-effective alternatives are plastics whose properties have been greatly improved by means of treatment with high-energy electron beams. Note de contenu : - Particular challenges in electric vehcicles
- Cost-effective alternatives with irradiation crosslinking
- The principle behind the procedure
- The added value of radiation crosslinking
- Applications in electric vehicles
- Fig. 1. Crosslinked engineering plastics can be used for many different applications in electric vehicles
- Fig. 2. Standard polymers as well as engineering plastics and high-performance polymers
can be crosslinked. The process permits treatment of the polymers highlighted in green
- Fig. 3 : Trend lines due to irradiation crosslinking for different material properties. Of particular interest for use in electric vehicles are
the resulting higher thermal stability and chemical resistance
- Fig. 4 : Treatment significantly increases the short-term thermal stability of glass fiber-reinforced plastics – the increase is particularly large with PA6
- Fig. 5 : Fracture surfaces from tensile tests with non-irradiated (left) and irradiated PA6-GF30 (right) under the scanning electron microscope : the matrix remnants on the glass fibers of the irradiated sample indicate the better bond between fibers and matrix polymer
- Table 1 : Comparison of mechanical characteristics of non-irradiated and irradiated PA66 (at room
temperature / 120 °C)
- Table 2 : Comparison of mechanical characteristics for non-irradiated and irradiated PA6-GF30 (parallel / transverse to injection direction)En ligne : https://drive.google.com/file/d/1aWUj2lAlNAXfypGvJDMb6plxIdV6zzxP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37300
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2022) . - p. 14-17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23299 - Périodique Bibliothèque principale Documentaires Disponible Electronique imprimée et "smart composites" / Mathieu Schwander in PLASTIQUES & CAOUTCHOUCS MAGAZINE, N° 959 (09/2019)
[article]
Titre : Electronique imprimée et "smart composites" Type de document : texte imprimé Auteurs : Mathieu Schwander, Auteur ; Cécile Reynaud, Auteur Année de publication : 2019 Article en page(s) : p. 60-63 Langues : Français (fre) Catégories : Composites à fibres de verre
Electronique imprimée
Equipements électroniques ou électriques (EEE)
Matériaux intelligents
PolyimidesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Fonctionnalisation Connectivité, expérience augmentée, performance durable sont les maîtres-mots de la conception produits. Pour répondre à ces demandes, il faut être en mesure d'intégrer toujours plus de fonctions dans les pièces, tout en respectant des exigences de design et de coût. C'est l'objet des "smart composites". Note de contenu : - L'électronique imprimée
- Impact mécanique
- Application
- La fonctionnalisation par l'usage
- Fig. 1 : Procédé d'infusion
- Fig. 2 : Vue d'ensemble de la pale et du système d'acquisition/contrôle
- Fig. 3 : Description des composants et interface graphiqueEn ligne : https://drive.google.com/file/d/1nHw0s8XS7wErmF-gy5GUDJhERUEAwZrx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32887
in PLASTIQUES & CAOUTCHOUCS MAGAZINE > N° 959 (09/2019) . - p. 60-63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21136 - Périodique Bibliothèque principale Documentaires Disponible Enhance slower relaxation process of poly(ethyl acrylate) through internal plasticization / X. R. He in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)
[article]
Titre : Enhance slower relaxation process of poly(ethyl acrylate) through internal plasticization Type de document : texte imprimé Auteurs : X. R. He, Auteur ; H. Yu, Auteur ; R. Zhang, Auteur ; C.-H. Yang, Auteur Année de publication : 2014 Article en page(s) : p. 419-424 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Caoutchouc
Caractérisation
Composites à fibres de verre
Plastification
Polyacrylate d'éthyle
Relaxation moléculaire
Structure moléculaireIndex. décimale : 668.4 Plastiques, vinyles Résumé : In this paper, we report a chemical way to resolve longer motions units in the glass-rubber transition region of poly (ethyl acrylate) (PEA), so called internal plasticization. The ethyl acrylate (EA) monomers were copolymerized with little amount of isoprene (IP) monomers. We propose that the single bonds adjunct to double bonds would have better flexible activity than usual single bonds, so the motion units located between two adjunct double bonds would be enhanced. The dynamic mechanical spectra of internally plasticized PEA (IPPEA) and PEA show that the tan ? of IPPEA is asymmetric, while the tan ? of PEA is symmetric. Furthermore, the results of 2D-DMAS show that the LSM, SRM and RM of IPPEA are located at 7 °C, 12 °C and 36 °C. The shoulder peak of tan ? of IPPEA at higher temperature side was confirmed that it contains sub-rouse mode (SRM) and rouse mode (RM). Thus, internal plasticization is an effective way to resolve modes above Tg. Note de contenu : - Materials - Preparation
- Characterization of molecular weight and polydispersity
- Characterization of molecular structure
- Dynamic mechanical analysis
- Two-dimensional analysisDOI : 10.3139/217.2882 En ligne : https://drive.google.com/file/d/1jgIOx1yPD2bjChffIfUDc7vllbL71YRd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21740
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 3 (07/2014) . - p. 419-424[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16404 - Périodique Bibliothèque principale Documentaires Disponible Enhanced infrared heating of thermoplastic composite sheets for thermoforming processes / M. Längauer in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 1 (2021)
[article]
Titre : Enhanced infrared heating of thermoplastic composite sheets for thermoforming processes Type de document : texte imprimé Auteurs : M. Längauer, Auteur ; G. Zitzenbacher, Auteur ; C. Burgstaller, Auteur ; C. Hochenauer, Auteur Année de publication : 2021 Article en page(s) : p. 35-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chauffage
Composites à fibres -- Thermoformage
Composites à fibres de carbone
Composites à fibres de verre
Polyamide 6
Polyamide 66
Rayonnement infrarougeIndex. décimale : 668.4 Plastiques, vinyles Résumé : Thermoforming of thermoplastic composites attracts increasing attention in the community due to the mechanical performance of these materials and their recyclability. Yet there are still difficulties concerning the uniformity of the heating and overheating of parts prior to forming. The need for higher energy efficiencies opens new opportunities for research in this field. This is why this study presents a novel experimental method to classify the efficiency of infrared heaters in combination with different thermoplastic composite materials. In order to evaluate this, different organic sheets are heated in a laboratory scale heating station until a steady state condition is reached. This station mimics the heating stage of an industrial composite thermoforming device and allows sheets to slide on top of the pre-heated radiator at a known distance. By applying thermodynamic balances, the efficiency of chosen parameters and setups is tested. The tests show that long heating times are required and the efficiency of the heating is low. Furthermore, the efficiency is strongly dependent on the distance of the heater to the sheet, the heater temperature and also the number of heating elements. Yet, using a full reflector system proves to have a huge effect and the heating time can be decreased by almost 50%. Note de contenu : - Specific heat capacity
- Heating tests without reflectors
- Heating tests using reflectors
- Table 1 : Input parameters for the calculation of the enthalpy and heat flux (a derived from material data sheet)DOI : https://doi.org/10.1515/ipp-2020-3923 En ligne : https://drive.google.com/file/d/1NRCKw4IGMW7OJRvSI5wngwS8omSB2xAy/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36344
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 1 (2021) . - p. 35-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23731 - Périodique Bibliothèque principale Documentaires Disponible Enhancement of mechanical properties in glass-fiber woven reinforced hybrid composites for aerospace applications : An empirical investigation / Farouk Al-Attar Abeer in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 33, N° 6 (12/2023)
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PermalinkExperimental and numerical investigation of shrinkage and warpage of a U-shaped injection molded part / Stefan Kleindel in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)
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