3D-shaped multilayer fabrics for high-performance, multifunctional composites / Monireh Fazeli in JEC COMPOSITES MAGAZINE, N° 81 (05-06/2013)

[article]  inJEC COMPOSITES MAGAZINE > N° 81 (05-06/2013) . - p. 54-59 Titre : 3D-shaped multilayer fabrics for high-performance, multifunctional composites Type de document : texte imprimé Auteurs : Monireh Fazeli, Auteur ; Adil Mountasir, Auteur ; Gerald Hoffmann, Auteur ; Chokri Cherif, Auteur Année de publication : 2013 Article en page(s) : p. 54-59 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Matériaux Composites à fibres -- Thermoformage Composites à fibres de verre Composites à fibres de verre -- Propriétés mécaniques Construction mécanique Essais dynamiques Fibres continues Polypropylène Production en série Renforts textiles Structures multicouches Structures tridimensionnelles Tissage Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Fibre-reinforced plastics (FRP) in the form of continious fibre-reinforced thermoplastics composites exhibit a great potential for mass production of complex, load-bearing and recyclable components in automotive and mechanical engineering. The use of thermoplastics matrix materials makes it possible to manufacture lightweight, high-quality complex-shape composites cost-efficiently and with high productivity. To ensure the demanded short cycle times while simultaneously guaranteeing highly specific properties of structural components, the most suitable method is hot pressing, using deep drapable multilayers and 3D-shaped thermoplastic preforms based on thermoplastic hybrid yarns. The advantages of glass fibre/PP hybrid yarns are their homogenous combination of continuous filaments, as well as their great yarn compaction, which permits further textile technological processing. Commercially available yarn materials can be used in widely varying forms, and the individual intra-yarn content percentages can be ajusted to preference oven an exrensive range. 3D-shaped multilayer woven fabrics are suited for the reinforcement od higher-gauge FRP due to the use of thicker and preferably compact fabrics, as their multilayers structure helps minimase the usual stacking of multiple individual reinforcement layers. In this study, hybrid yarns and composite sheets made of multilayers woven fabtics are tested according to their mechanical properties. Note de contenu : - EXPERIMENTAL : Hybrid yarn manufacturing - Weaving technology for 3D-multilayer woven spacer fabric - Thermoforming process - RESULTS AND DISCUSSION : Homogeneous distribution of hybrid yarns - Tensile force testing of GF/PP hybrid yarns Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22865 [article]

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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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Simulation-based development of woven fabrics for 3D FRP applications / Martin Kern in TECHNICAL TEXTILES, Vol. 65, N° 4 (10/2022)  

[article]  inTECHNICAL TEXTILES > Vol. 65, N° 4 (10/2022) . - p. 226-228 Titre : Simulation-based development of woven fabrics for 3D FRP applications Type de document : texte imprimé Auteurs : Martin Kern, Auteur ; Thi Anh My Huynh, Auteur ; Gerald Hoffmann, Auteur ; Thomas Gereke, Auteur ; Chokri Cherif, Auteur Année de publication : 2022 Article en page(s) : p. 226-228 Langues : Multilingue (mul) Catégories : Composites à fibres Modèles numériques Simulation par ordinateur Structures tridimensionnelles Textiles et tissus à usages techniques Tissage Tissés Index. décimale : 677 Textiles Résumé : When manufacturing 3D component geometries from fiber-plastic composites, undesirable distortions occur during the forming of the textile structure, which lead, for example, to wrinkle formation or fiber mis-orientation. This can be counteracted by developing tailor-made fabrics that exhibit the required local forming capacity in individual sub-areas. For the design and implementation of these tailored weaves, a CAE process chain was validated and a novel ORW system was developed in terms of design technology. Note de contenu : - Modelling - Textile technical realization of tailored weaves - Fig. 1 : FEM drape model - Fig. 2 : Comparison of the distortion behavior of plain woven fabric and tailored weave with different weave sub-areas and ORS yarns in a) experiment and b) model, c) simulated shear angle distribution - Fig. 3 : a) Weave plan and b) drafting pattern for the manufacturing the spring dome - Fig. 4 : Formed and consolidated spring dome geometry : a) experiment, b) drape simulation En ligne : https://drive.google.com/file/d/1F_eLhpV22HKQUwMF7z_svHIb-zh0NHKq/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38559 [article]

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