Simulation-based development of 3D woven fabrics for high-tech applications / Thi Anh My Huynh in TECHNICAL TEXTILES, Vol. 66, N° 4 (2023)  

[article]  inTECHNICAL TEXTILES > Vol. 66, N° 4 (2023) . - p. 38-41 Titre : Simulation-based development of 3D woven fabrics for high-tech applications Type de document : texte imprimé Auteurs : Thi Anh My Huynh, Auteur ; Minh Quang Pham, Auteur ; Gerald Hoffmann, Auteur ; Thomas Gereke, Auteur ; Chokri Cherif, Auteur Année de publication : 2023 Article en page(s) : p. 38-41 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Simulation par ordinateur Structures tridimensionnelles Textiles et tissus à usages techniques Tissage tridimensionnel Tissés Index. décimale : 677 Textiles Résumé : Numerical simulation helps in the analysis of textile structures. It also supports the technical development of 3D preforms that are cut-free and woven to final contour, which is the prerequisite for a one-step manufacturing process (direct pre-forming). The simulation-based development process not only reduces trial-and-error, but also predicts the limits of current technology. The fiexibility of the machine technology enables the production of multilayer and highly anisotropic preforms for high-performance FRP components. It has been shown that the production of certain 3D fabrics with fewer plies and a single weave works well. When producing 3D fabrics with more than 4 plies, the yarn-yarn friction on the warp yarn system increases strongly. At the same time, the shed cannot open completely. In order to keep the frictional forces low even with multilayer 3D fabrics, further investigations are required. For low-damage processing, a new technique with twin flat-steel healds is currently in the research phase. This technique is based on the modifica¬tion of the heald system, which makes it possible to position the warp threads on top of each other. The yarn-yarn friction during weaving is thus reduced and damage to the threads minimized. Note de contenu : - Modelling of the weaving process - Fig. 1 : Filament cross-section and computation time at different number of modelled filaments in the yarn, cross-section in the models and in reality - Fig. 2 : Example of an FEM weaving process simulation with representation of the boundary conditions - Fig. 3 : Warp cut of the simulated 3D fabrics with different heald distances - Fig. 4 : Force measurements in the process simulation for 3 variants of the heald spacing - Fig. 5 : exemplary representation of a 3D fabric as a) wave repeat, b) simulation model and c) experment - Fig. 6 : Optical comparison of simulated and manufactured layer-to-layer fabrics in warp and weft direction En ligne : https://drive.google.com/file/d/1cRZGsGD_OBA3RzYk4Sa6RfCCt1DxXC7m/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40140 [article]

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Using 3D weaving for additive manufacturing of ceramic preforms / Silke Grosch in TECHNICAL TEXTILES, Vol. 65, N° 5 (12/2022)  

[article]  inTECHNICAL TEXTILES > Vol. 65, N° 5 (12/2022) . - p. 282-285 Titre : Using 3D weaving for additive manufacturing of ceramic preforms Type de document : texte imprimé Auteurs : Silke Grosch, Auteur ; Frank Ficker, Auteur Année de publication : 2022 Article en page(s) : p. 282-285 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Fibres céramiques Impression tridimensionnelle Préformes Objet constituant la majeur partie d’une pièce à fabriquer et qui nécessite un travail supplémentaire pour devenir une pièce finie. Ce terme s’utilise notamment pour le moulage, l’usinage, la taille d’outils en silex, la fabrication de fibre optique… Textiles et tissus -- Appareils et matériels Textiles et tissus synthétiques Tissage tridimensionnel Index. décimale : 677 Textiles Résumé : The production of ceramic high-performance composites is essentially an additive process in which near-net-shape manufacturing is aimed for the textile semi-finished products. In this context, state-of-the-art textile machines, in conjunction with computer-aided methods for binding and stress simulation, enable the targeted design of complex 3D structures. Carefully adapted process parameters are essential for processing ceramic fibers in order to achieve a low-damage result. Ceramic fiber preforms are produced in one step and in series. These are used for the production of ceramic high-performance composites. The potential of 3D weaving technology, which is also predestined for the implementation of load-adjusted yarn runs, is illustrated by an airfoil for gas turbines. Note de contenu : - Potential of textile manufacturing for ceramic components - Development of a 3D preform for CMC airfoils - Fig. 1 : Hot gas fan made of a ceramic matrix composite with oxide ceramics - Fig. 2 : New double rapier weaving machine in Münchberg - Fig. 3 : Variation braider for complex braid reinforcing structures - Fig. 4 : Circular needling machine - Fig. 5 : Target geometry of the airfoil - Fig. 6 : Distribution of tensile stresses (MPa) in the airfoil made of the CMC material at different rotational speeds : 5000 1/min and 10000 1/min - Fig. 7 : First attempt at binding development with simplified basic bindings - Fig. 8 : First preform produced on a laboratory loom - Fig. 9 : Weft pattern, simulation and top view of the selected multi layer fabric - Fig. 10 : Feasibility study on a single-stage preform for a fan wheel En ligne : https://drive.google.com/file/d/1qTAZycBDFKU9MEvmL-zEm70T6gsX5mUG/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38754 [article]

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