Hard shell, lightweight core / Philipp Angst in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 1-2 (01-02/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 1-2 (01-02/2019) . - p. 18-19 Titre : Hard shell, lightweight core : Rapid and cost effective sandwich parts with PU resin and PET core foam Type de document : texte imprimé Auteurs : Philipp Angst, Auteur ; Mike Wienand, Auteur Année de publication : 2019 Article en page(s) : p. 18-19 Langues : Anglais (eng) Catégories : Composites à fibres de carbone Construction sandwich Moulage par transfert de résine sous vide Mousses plastiques Polyéthylène téréphtalate Polyuréthanes Index. décimale : 668.4 Plastiques, vinyles Résumé : The combination of fiber-reinforced face layers with a lightweight foam core combines high strength and stiffness with low part weight. However, when processing, it is anything but easy to combine anisotropic FRP materials with lightweight,cost-effective foams. A tailored material system now makes processing by high-pressure resin transfer molding possible at low temperatures and pressures, with short cycle times. Note de contenu : - Good connection between the facing and core layers - Evaluating the process window - Figure : Good surface quality, pristine foam core : a cross-section through and HP-RTM part with carbon-fiber reinforcement of Airex T10.110 core and Henkel Loctite Max 2 PU resin - Fig. 1 : Compressive strength of the foam cores Airex T10.110 and Airex TX.170 dependent on th emold temperature in the HP-RTM process - Fig. 2 : Schematic curing behavior (DEA measurement) of Loctite Max 2 at 70°C mold temperature. The characteristically low viscosity at the start of the reaction is represented as a dotted line. Due to the freely selectable concentration of accelerator, a very curing of below 3 min can be achieved even at very low mold temperatures in the range from 60 to 70°C En ligne : https://drive.google.com/file/d/1NdkmRVIq7AgLG-nt9WPWNhTbbXTNwpFJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31810 [article]

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Optimizing leaf springs via enhanced composite solutions / Pascal Albrecht in JEC COMPOSITES MAGAZINE, N° 128 (05-06/2019)  

[article]  inJEC COMPOSITES MAGAZINE > N° 128 (05-06/2019) . - p. 24-26 Titre : Optimizing leaf springs via enhanced composite solutions Type de document : texte imprimé Auteurs : Pascal Albrecht, Auteur ; Jürgen Becher, Auteur ; Christos Derdas, Auteur ; Mike Wienand, Auteur ; Jan Hindahl, Auteur Année de publication : 2019 Article en page(s) : p. 24-26 Langues : Anglais (eng) Catégories : Automobiles -- Ressorts et suspension Composites à fibres de verre Essais de résilience Essais dynamiques Matériaux -- Allègement Matériaux -- Fatigue Polyuréthanes Index. décimale : 668.4 Plastiques, vinyles Résumé : Leaf springs are a component that can be lightweighted using composites. The results of joint research between Saertex GmbH & Co. KG and Henkel AG & Co. KgaA on how engineered preform architectures and high fatigue resistance PU resins can enhance fatigue performance are presented in this paper. Note de contenu : - Materials - Coupon-levels results - Fig. 1 : Leaf spring demonstrator preform placed in the mould - Fig. 2 : Leaf spring demonstrator - Fig. 3 : Coupon test stress results comparison - Fig. 4 : Coupou-level tensile fatigue test results - Fig. 5 : The fatigue test rig, as installed at Henkel's Global Engineering Centre - Fig. 6 : Maximum force vs. cycles to failure En ligne : https://drive.google.com/file/d/1pvAuM6qLM6Zmk1tw6lEemu8yLFw-pu7I/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32532 [article]

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Sandwich design opens huge potential for lightweight engineering / Philipp Angst in JEC COMPOSITES MAGAZINE, N° 126 (01-02/2019)  

[article]  inJEC COMPOSITES MAGAZINE > N° 126 (01-02/2019) . - p. 21-24 Titre : Sandwich design opens huge potential for lightweight engineering Type de document : texte imprimé Auteurs : Philipp Angst, Auteur ; Jürgen Emig, Auteur ; Mike Wienand, Auteur ; Pascal Albrecht, Auteur Année de publication : 2019 Article en page(s) : p. 21-24 Langues : Anglais (eng) Catégories : Composites à fibres Construction sandwich Coût -- Contrôle Fibres à orientation unidirectionnelle Fibres continues Hautes pressions Matériaux -- Allègement Matières plastiques dans les automobiles Moulage par transfert de résine sous vide Index. décimale : 668.4 Plastiques, vinyles Résumé : The trend toward electromobility only reinforced it : lightweight engineering has long been the focus of the automotive industry. Lightweight engineering has two positive effects on the sustainability of vehicles. A lighter vehicle consumes less energy for acceleration and frictional resistance. Moreover, fewer raw materials are needed for production which is another positive contribution toward sustainable mobility. Note de contenu : - Weight reduction with composite sandwich structures - Weight and cost savings - Established and cost-effective in large, global markets - Example applications in series vehicles - Sandwich manufacturing process - The challenge of HP-RTM - Short injection times allow the use of cost-effective rigid foams - Process control based on the foam core's compressibility - Optimum resin choice - Successful test series - Composite sandwiches are mature enough to significantly reduce a car's weight - Fig. 1 : Different fibre reinforcements : oriented continuous fibres (tissue/scrim, UD) provide excellent mechanical properties (press process manufacturing - Fig. 2 : Sandwich construction increases rigidity/stiffness at the same weight - Fig. 3 : Increased core density over 0.1 kg/dm^3 hardly offers additional stiffness advantages - Fig. 4 : With comparable stiffness and rigidity, the sandwich is much lighter, thus requiring fewer expensive raw materials. Thickness (height) is higher in the sandwich - Fig. 5 : Pressure-time graph for a HP-RTM sandwich process showing the internal mould pressures, resin curing/viscosity at 100°C, and foam internal temperature - Fig. 6 : Schematic curing behaviour of Loctite Max 2 at 70°C mold temperature - Table 1 : Exemplary applications of sandwich designs in series production - Table 2 : Overview and evaluation of FRP sandwich production processes - Table 3 : Resin systems and processing parameters for manufacturing of HP-RTM sandwich parts En ligne : https://drive.google.com/file/d/10LQ9B9nGj51l3R_TaLq9CebNIayHeoTd/view?usp=drive [...] Format de la ressource électronique : pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31782 [article]

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