Composites welding : characterisation and prediction oaf adhesion kinetics / Julien Avenet in JEC COMPOSITES MAGAZINE, N° 149 (01-02/2023)  

[article]  inJEC COMPOSITES MAGAZINE > N° 149 (01-02/2023) . - p. 48-51 Titre : Composites welding : characterisation and prediction oaf adhesion kinetics Type de document : texte imprimé Auteurs : Julien Avenet, Auteur ; Violaine Le Louët, Auteur ; Maxime Villière, Auteur ; Vincent Sobotka, Auteur Année de publication : 2023 Article en page(s) : p. 48-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adhésion Caractérisation Composites à fibres -- Soudage Composites à fibres de carbone Polyéther éther cétone Index. décimale : 668.4 Plastiques, vinyles Résumé : The TACOMA device was developed to predict the quality of thermoplastic composite adhesion, considering the influence of various composites material and process parameters. It provides the aerospace industry with the key data to ensure high-quality welding. Note de contenu : - Adhesion mechanisms - Identification of adhesion kinetics - Experimental protocol - High performance thermoplastic compoosites : healing kinetics - Towards the optimisation of welding processes - Fig. 1 : Schematic description of the different phenomena involved in thermoplastic welding processes - Fig. 2 : Wchematic view of the TACOMA welding bench - Fig. 3 : Schematic view of the DCB samples and their dimensions - Fig. 4 : Experimental welding procedure used for healing kinetics identification - Fig. 5 : Mechanical testing set-up for the double cantilever beam fracture test - Fig. 6 : Evolution of interlaminar fracture toughness (G IC) with contact time at three isothermal temperature - Table 1 : Identified welding times of a CF-PEKK high performance composite En ligne : https://drive.google.com/file/d/1_6jWI3WCrrrvRxcaOjLI_D2YlBkNuPhn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40225 [article]

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Glass fiber-reinforced polyphenylene sulfide made weldable / Frank Brunnecker in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 7 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 7 (2020) . - p. 47-49 Titre : Glass fiber-reinforced polyphenylene sulfide made weldable : Novel laser welding technology can also be used for higher filled PPS types Type de document : texte imprimé Auteurs : Frank Brunnecker, Auteur ; Christian Ebenhöh, Auteur ; Daniel Bierl, Auteur ; Jürgen Brettschneider, Auteur ; Guido Pengemann, Auteur ; Uwe Behle, Auteur Année de publication : 2020 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Composites à fibres -- Soudage Composites à fibres de verre Matières plastiques -- Soudage Polysulfures de phénylène Soudage laser Index. décimale : 668.4 Plastiques, vinyles Résumé : Especially in the automotive industry, high-performance polymers are increasingly replacing assemblies made of metal and conventional engineering plastics, but their properties often present new challenges for joining technology. With novel laser system technology, even demanding materials can be joined. Note de contenu : - PPS connected in a process-safe way - Laser welding of glass fiber filled materials - Analysis of differently filled types - Comparison of joining methods - Figure : Cross-section of a weld seam : The microsection of the seam shows a joining zone and charac-teristic melt flow for quasi-simultaneous welding - Fig. 1 : Water pumps such as Bühler Motor’s bFlow C5A-60x feature components made of polyphenylene sulfide in highly stressed areas - Fig. 2 : Laser-welded PPS sample plates: The black plate contains particle carbon black and therefore absorbs the laser radiation - Fig. 3 : Laser transmission of DIC.PPS at λ = 980 nm and a material thickness of 1 mm - Fig. 4 : Average pull-off forces of laser-welded DIC.PPS samples (n=3) - Fig. 5 : Average pull-off forces depending on the welding process, DIC.PPS FZ-2140 (n=3) En ligne : https://drive.google.com/file/d/1LfnIsniYc7Q-MLYvI5xxd0-vK0a9_EVS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34818 [article]

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Modeling and numerical simulation of laminated thermoplastic composites manufactured by laser-assisted automatic tape placement / Gilles Ausias in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXV, N° 5 (11/2020) . - p. 471-479 Titre : Modeling and numerical simulation of laminated thermoplastic composites manufactured by laser-assisted automatic tape placement Type de document : texte imprimé Auteurs : Gilles Ausias, Auteur ; G. Dolo, Auteur ; D. Cartié, Auteur ; F. Challois, Auteur ; P. Joyot, Auteur ; J. Férec, Auteur Année de publication : 2020 Article en page(s) : p. 471-479 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Composites à fibres -- Soudage Composites à fibres de carbone Composites thermoplastiques Modèles numériques Pose de rubans automatisée Simulation par ordinateur Stratifiés Index. décimale : 668.4 Plastiques, vinyles Résumé : A comprehensive numerical model is developed for the simulation of the laser-assisted automated tape placement process of carbon fiber/thermoplastic composites. After being heated with a laser, the thermoplastic is welded with the help of a consolidation roller onto a substrate made up of layers of tapes bonded onto one another. Under the pressure applied by the roller, the thermoplastic flows and the tape reaches its final thickness. The numerical model is developed in three sequential steps that can be used to identify the required pressure and temperature distribution to achieve a good bond. Firstly, a heat transfer simulation is performed to determine the temperature distribution into the incoming tape under the consolidation roller. Secondly, a rheological model is developed to examine the polymer flow under the roller and to obtain the pressure field. Finally, the consolidation level between the substrate and the tape is investigated through the degree of intimate contact, which is related to the processing parameters such as the roller velocity, the laser power density and the compaction force. Note de contenu : - MATERIAL AND PROCESS : Material - Process and experiments - Thermal analysis - Flow modeling under the consolidation roller : Principle - Governing equations - MODEL PREDICTION : Numerical implementation - Simulation results - Abacus on process behavior - CONSOLIDATION DOI : https://doi.org/10.3139/217.3976 En ligne : https://drive.google.com/file/d/1nup1rB0jZUCrtgFPgYjypHgIKLpQqKer/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35069 [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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