Repairing instead of replacing / David Rabe in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 34-36 Titre : Repairing instead of replacing : Process for repairing CFRP components without machining Type de document : texte imprimé Auteurs : David Rabe, Auteur ; Philippa Böhnke, Auteur ; Thi Anh My Huynh, Auteur ; Iris Kruppke, Auteur ; Thomas Gereke, Auteur ; Eric Häntzsche, Auteur ; Chokri Cherif, Auteur Année de publication : 2021 Article en page(s) : p. 34-36 Langues : Anglais (eng) Catégories : Composites -- Réparation Composites à fibres de carbone Coût -- Contrôle Fibres à orientation unidirectionnelle Patchs de réparation Rayonnement ultraviolet Structures multicouches Tricot Index. décimale : 668.4 Plastiques, vinyles Résumé : CFRP components are often in continuous use under harsh environmental conditions, for example in aircraft and motor vehicles. If any damage occurs, the CFRP structures are simply replaced by new components in most cases. This is mainly due to the high cost of established repair methods. With a newly developed process, defective CFRP structures can now be repaired locally much more easily. Note de contenu : - Three process steps to the repaired CFRP component - Simulation as a basis - UV light instead of manual ablation - Tests with UD, TFP and MLG patches - Costs reduced by 80 percent - Fig. 1 : Overview of the simulation-based repair method for CFRP components: the method enables targeted repair of the damaged area - Fig. 2 : In the process, the damaged area of the test specimen (1) is treated with a UV LED lamp (see Fig. 3). The fibers are then separated (3) in the repair area (2) thus exposed. The prepared repair area (4) is then cleaned, activated and prepared by an adhesion promoter for the insertion of the patch - Fig. 3 : Matrix removal in the repair area is carried out with the help of an UV LED lamp. Compared to conventional processes, the manual effort is highly reduced, which ensures higher reproducibility - Fig. 4 : For the repair, for example, a TFP patch is inserted into the prepared site (A – first patch part inserted, B – second patch part inserted). For the subsequent reinfiltration (C), a method based on the VARI process is used - Fig. 5 : Rupture force (F max) and elongation at F max for the different patch variants : The UD and MLG patches achieve the best values En ligne : https://drive.google.com/file/d/1BHkov2psRWJmmN5IaLr9k_L_tpLUbZcq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36176 [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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Textile structures with bio-modular deformation behavior for intervertebral disc protheses / Robert Tonndorf in TECHNICAL TEXTILES, Vol. 67, N° 2 (2024)  

[article]  inTECHNICAL TEXTILES > Vol. 67, N° 2 (2024) . - p. 24-27 Titre : Textile structures with bio-modular deformation behavior for intervertebral disc protheses Type de document : texte imprimé Auteurs : Robert Tonndorf, Auteur ; Dilbar Aibibu, Auteur ; Thi Anh My Huynh, Auteur ; Mareen Warncke, Auteur ; Chokri Cherif, Auteur Année de publication : 2024 Article en page(s) : p. 24-27 Note générale : Bibliogr. Langues : Multilingue (mul) Catégories : Couture Implants médicaux Implants orthopédiques Prothèse discale Textiles et tissus à usages médicaux Textiles et tissus à usages techniques Tissage en roseau ouvert Tissage tubulaire Tricot Index. décimale : 677.4 Textiles artificiels Résumé : The IGF project Spinetex laid the basis for the development of textile structures with bi-modular force-elongation behavior that have the potential to replicate the fibrous ring of biomimetic disc prostheses. To achieve the bimodular behavior of such structures, 3 textile technologies were investigated : stitching, open reed weaving (ORW), and tubular weaving with twines. Note de contenu : - Stitching - Open reed weave (ORW) - Tubular weaving - Fig. 1a : Schematic of the structure of alternating diagonal layers of yarns - Fig. 1b : Stitched samples with fixation elements on knitted fabric - Fig. 1c : Structure folded into a circular shape - Fig. 2 : Fabrication of structures using the ORW technique - Fig. 3 : Fabrication of a tubular structure ; expanding cylindrical structures having a viscoelastic core under compressive load - Fig. 4 : Bi-modular force strain curves of textile structures En ligne : https://drive.google.com/file/d/1K1Ihw6HFhuUIFgC-4XL8Aga2XD53U7Ir/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41086 [article]

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