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Reducing the number of OHT tests / T. E. Tay in JEC COMPOSITES MAGAZINE, N° 88 (04/2014)
[article]
Titre : Reducing the number of OHT tests : Observations on strain to failure of composite laminates Type de document : texte imprimé Auteurs : T. E. Tay, Auteur ; M. Ridha, Auteur Année de publication : 2014 Article en page(s) : p. 49-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone
Déformations (mécanique)
Eléments finis, Méthode des
Epoxydes
Essais de résilience
Essais dynamiques
Résistance des matériaux
Rupture (mécanique)
StratifiésIndex. décimale : 668.4 Plastiques, vinyles Résumé : The complexity of damage progression and failure of composite materials has prompted the conventional approach - widely adopted in industry - of performing huge numbers of coupon-level tests. This approach is extremely costly in terms of both time and resources. On the other hand, while there has been significant advances and sophistication in computational modelling of composite failure, the industry has not taken full advantage of these methods. Note de contenu : - Numerous tests for damage tolerant design
- Recent development in finite element model
- OHT scaling and laminate lay-ups
- Master stiffness data for OHT specimens
- Strain to failure and strength of OHT specimentsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21378
in JEC COMPOSITES MAGAZINE > N° 88 (04/2014) . - p. 49-51[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16229 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Reinforcement on approach : New applications for the automated production of fiber composite components Type de document : texte imprimé Auteurs : Daniela Klotz, Auteur Année de publication : 2022 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Assemblages multimatériaux
Automatisation
Composites à fibres de carbone
Drapage
Industries aérospatiales -- Matériaux
Placement automatisé de fibres
Réservoirs (récipients)
Structure en nid d'abeillesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Particularly two industries have shown considerable interest in FPP technology: aerospace industry in automating the lay-up processes of multi-material lightweight components with sandwich cores, as well as manufacturers of CFRP pressure vessels for hydrogen-powered vehicles (FCEVs), who can thus achieve savings in the double-digit percentage range. In both areas, FPP is the first technology to automate critical fiber lay-up processes in order to industrialize the production. Note de contenu : - Lay-up automation for complex, multi-material aerostructures
- H2 composite tanks with FPP dome reinforcements
- Customized production systems based on flexible modules
- Fig. 1 : The FPP system combines several modules for feeding, cutting, material control, position control and fiber placement
- Fig. 2 : The fiber material can be placed directly on the chamfered transition of a honeycomb core
- Fig. 3 : The process also enables the combined lay-up of sandwich core skins and monolithic sections, as shown here for an aerospace component
- Fig. 4 : The robotic system places the reinforcement patches directly on the dome areas of the pressure vesselEn ligne : https://drive.google.com/file/d/1HKTvyTeadVSTq9hBMX97uYs7N02l_Q_A/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37960
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022) . - p. 24-26[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23406 - Périodique Bibliothèque principale Documentaires Disponible Repair and replacement of concrete pipes with carbon composites / Francesc Robles in JEC COMPOSITES MAGAZINE, N° 119 (03/2018)
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Titre : Repair and replacement of concrete pipes with carbon composites Type de document : texte imprimé Auteurs : Francesc Robles, Auteur ; Saturnino Ojeda, Auteur Année de publication : 2018 Article en page(s) : p. 66-67 Langues : Anglais (eng) Catégories : Caractérisation
Composites -- Moulage par infusion sous vide
Composites à fibres de carbone
Eléments finis, Méthode des
Entretien et réparations
Epoxydes
TuyauterieIndex. décimale : 668.4 Plastiques, vinyles Résumé : This paper describes the in-situ manufacturing of a carbon fibre pipeline by means of an epoxy resin infusion process followed by vacuum consolidation. The process uses as a lost mould the existing reinforced concrete pipe with steel core in poor condition, which serves for the cooling process of a nuclear power plant reactor. The carbon fibre pipeline, which is buried at a depth of 4 to 9 metres, is designed to provide by itself the required structural resistance and tightness, without considering the contribution oh the existing pipeline. Note de contenu : - Scope and description
- Design, calculations and characterization tests
- In-situ execution
- Benefits and key advantages
- Fig. 1 : Calculations and finite element modelling
- Fig. 2 : Installation of the SAERfix carbon non-crimp fabrics (self-adhesive)
- Fig. 3 : The five process steps
- Fig. 4 : Infusion and vacuum system, design and installation
- Fig. 5 : The finished carbon fibre pipe before nanoceramic coatingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30384
in JEC COMPOSITES MAGAZINE > N° 119 (03/2018) . - p. 66-67[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19663 - Périodique Bibliothèque principale Documentaires Disponible
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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 An 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
TricotIndex. 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 valuesEn ligne : https://drive.google.com/file/d/1BHkov2psRWJmmN5IaLr9k_L_tpLUbZcq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36176
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 34-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22867 - Périodique Bibliothèque principale Documentaires Disponible Replacing metal in the gearbox / Roger Kaufmann in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 2 (02/2020)
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Titre : Replacing metal in the gearbox : Production-ready plastic shifter fork offers a maximum of functional integration Type de document : texte imprimé Auteurs : Roger Kaufmann, Auteur ; Jana Horn, Auteur Année de publication : 2020 Article en page(s) : p. 28-31 Langues : Anglais (eng) Catégories : Automobiles -- Moteurs -- Pièces
Boites à vitesse
Composites à fibres de carbone
Composites à fibres de carbone -- Propriétés mécaniques
Essais de résilience
Essais dynamiques
Matériaux -- Allègement
Matières plastiques dans les automobiles
PolyphthalamideIndex. décimale : 668.4 Plastiques, vinyles Résumé : Anyone seeking to replace a metal component by a plastic one, to reduce the number of component parts from eight to three and simultaneously cut both the weight and manufacturing costs needs to take great care to ‧ensure that all specifications are met – especially if the component is used in a hot gearbox and is subject to high mechanical stress. For developing a new shifter fork, GK Concept and its customer Koki Technik were awarded the 2019 GKV/TecPart Innovation Prize. Note de contenu : - Trojan work at up to 160°C
- Systematic search for the right material pairing
- A million windings for the insert
- Functional integration brings decisive cost advantages
- Endurance tests on automotive test rigs already passed
- Figure : The shifter fork creates a positive lock between the gear wheel and the shaft so that the engine power can be transmitted to the wheels
- Fig. 1 : An operating temperature of 120°C creates harsh conditions. The maximum permissible deformation of the fork-ends under an acting force of 1500N was well below 0.8 mm
- Fig. 2 : Clearly visible : the reinforcement of the shifter fork with chopped carbon fibers
- Fig. 3 : The filling simulation reveals the simultaneous melt flow into both fork ends. The carbon fiber insert is clearly visible on the right of the figure
- Fig. 4 : The high degree of orientation of the fibers increases the load-bearing capacity of the part and reduces shrinkage in the direction of the fibersEn ligne : https://drive.google.com/file/d/1juOPLXKtJeTkEjfS_tc6pOhxAGWEvoN_/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33978
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 2 (02/2020) . - p. 28-31[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21623 - Périodique Bibliothèque principale Documentaires Disponible Réponse dynamique amortie des poutres renforcées par des couches en composites sous une force mobile en utilisant la MEF / Abdennacer Chemami in MATERIAUX & TECHNIQUES, Vol. 106, N° 2 (2018)
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