Highly efficient adaptive fiber-composite rotor blade / Gero Pfizenmaier in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 5 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 5 (2021) . - p. 10-12 Titre : Highly efficient adaptive fiber-composite rotor blade : Additive manufacture of FRP injection molds for FRP components of small wind turbines Type de document : texte imprimé Auteurs : Gero Pfizenmaier, Auteur ; Lucas Ost, Auteur ; Jonas Krenz, Auteur ; Lars Ulke-Winter, Auteur ; Holger Seidlitz, Auteur ; Christian Beloch, Auteur Année de publication : 2021 Article en page(s) : p. 10-12 Langues : Anglais (eng) Catégories : Composites à fibres de verre Composites à fibres de verre -- Moulage par injection Eoliennes -- Matériaux Epoxydes Impression tridimensionnelle Matériaux -- Allègement Moules d'injection -- Conception et construction Pales d'éoliennes Polyuréthanes Index. décimale : 668.4 Plastiques, vinyles Résumé : Currently, small wind turbines can hardly be operated profitably in landlocked regions. This drawback has now been overcome by the partners EAB Gebäudetechnik Luckau GmbH and the Chair of Polymer-based Lightweight Design at the BTU Cottbus-Senftenberg : passive smartblades made from 3D-printed molds adapt independently to wind conditions. This is achieved by an intelligent layer structure and its bending-torsion-coupling. Note de contenu : - The inland path to profitable SWTs - Efficient product development thanks to modern simulation technology - CFD and FEM calculations : torsion under wind load - Figure : This newly developed rotor blade is especially suited for weak-wind regions and adapts independently to the wind load - Fig. 1 : Production-ready implementation of a rotor blade design with the profiles and the profile chord - Fig. 2 : Distribution of pressure on the rotor blade and Tsai-Wu failure criterion (TSAIW). There is no damage to the laminate at TSAIW < 1 - Fig. 3 : Regression curves (polynomial, degree 6) of torsion angle over blade length at a wind speed of 20 m/s - Fig. 4 : Development of the mold for manufacturing rotor blades. a) CAD model of the mold ; b) printed mold ; c) infusion of a rotor blade half ; d) rotor blade following gluing of both shell halves - Table : Process parameters in the hybrid production of mold halves En ligne : https://drive.google.com/file/d/1RLPMwrNHjoC_Ibj2A56sRcjkVkuoHEiD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36159 [article]

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Simulation of composites' heating / Lucas Ost in KUNSTSTOFFE INTERNATIONAL, Vol. 113, N° 4 (2023)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 113, N° 4 (2023) . - p. 60-64 Titre : Simulation of composites' heating : Joining of fiber-reinforced plastic composites Type de document : texte imprimé Auteurs : Lucas Ost, Auteur ; Oleg Shapovalov, Auteur ; Felix Kuke, Auteur ; Nikolay Doynov, Auteur ; Holger Seidlitz, Auteur ; Vesselin Michailov, Auteur ; Marcello Ambrosio, Auteur Année de publication : 2023 Article en page(s) : p. 60-64 Langues : Anglais (eng) Catégories : Assemblages (technologie) Composites à fibres -- Soudage Composites à fibres de carbone Fibres à orientation unidirectionnelle Polyamide 6 Simulation par ordinateur Soudage par rayonnement infrarouge Index. décimale : 668.4 Plastiques, vinyles Résumé : Modern material-compatible joining methods for fiber-reinforced plastics require the heating of the materials. In order to predict the respective complex temperature fields and curves, the Fraunhofer IAP and the BTU Cottbus-Senftenberg have developed numerical methods, which are able to simulate different radiation sources and process sequences as well. Note de contenu : - Heat fluxes and radiation distribution - Radially symmetric model : temperature prediction at the center of the sample - Three-dimensional model : Prediction of the temperature distribution - Comparison of experiment and simulation - The appropriate radiator distance - Fig. 1 : Experimental setup for temperature measurements on the bottom (left) and top surface (right) of the FRP plate : the thermographic system arrayed from the bottom on the non-radiated surface is calibrated by a single central thermocouple. Multiple thermocouples distributed over the upper side of the plate provide the measurement on the radiated plate surface - Fig. 2 : Heat fluxes and radiation distribution in the modeled system: Depending on the distance of the radiator, the radiation distributionchanges - Fig. 3 : The heat capacity of the examined CFRP depends strongly on the temperature - Fig. 4 : Comparison between experimentally measured and numerically calculated temperature progressions in the center of both surfaces during and after heating : the values show a high degree of agreement between experiment and radially symmetric FEM-simulation - Fig. 5 : Comparison of the temperature curves of the top surface between FEM and experiment for different distances from the center of the plate: The radiator distance has a greater influence on the heating rate than the plate thickness - Fig. 6 : Comparison of the temperature fields on the bottom surface of a 2 mm thick CFRP plate during heating shows a good agreement between FEM (lower image halves) and experiment (upper image halves) En ligne : https://drive.google.com/file/d/1DJyidaXLEYd1gXRuJRFzBGUr4xmP9k3s/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40155 [article]

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