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Heat transfer with plastics versus metals / Tobias Epple in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 6 (2021)
[article]
Titre : Heat transfer with plastics versus metals : Which fillers are best suited for thermally conductive plastics, and how they can help replace metals Type de document : texte imprimé Auteurs : Tobias Epple, Auteur Année de publication : 2021 Article en page(s) : p. 41-43 Langues : Anglais (eng) Catégories : Charges (matériaux)
Matières plastiques -- Additifs
Métaux -- Suppression ou remplacement
Polyamide 6
ThermocinétiqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : For many components, the use of metal-replacing plastics is an attractive possibility e. g. to save weight and benefit from enhanced design freedom. In various applications, however, the thermal conductivity of the polymers is of equal importance. There are different additives that can be used to enhance this property. In the development of two polyamide families, Domo Engineered Materials investigated which of those additives are especially useful to this end, and applied Light Flash Analysis to examine the materials. Note de contenu : - Two additives ahead of the rest
- Part geometry determines thermal conductivity
- Two measuring methods, one device
- Metals often over-designed
- Two case stories
- Figure : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring
- Fig. 1 : In-plane thermal conductivity measuring of PA6 with various different fillers: the thermal conductivity (TC) depends on the additive. In some cases it rises considerably at an additive content of 40 % or higher
- Fig. 2 : Through-plane thermal conductivity measuring of PA6 with various different fillers: boron nitride and graphite deliver the best values
- Fig. 3 : Combined results of in-plane and through-plane thermal conductivity measuring: isotropic materials show TC values on the bisector of the quadrant. The TC values of anisotropic materials are far away from the axis. Therefore, proper material selection must not only take the TC value in consideration, but also the part geometry
- Fig. 4 : By way of adapting the specimen, the LFA 467 HyperFlash device from Netzsch enables both through-plane and in-plane TC measuring
- Fig. 5 : Example of heat transfer through the heat sink of an LED: the heat (T2) on surface A passes through the heat sink (heat flow Q) and can then dissipate to the environment. The difference between T1 and T2 results in the thermal conductivity (h)
- Table : Comparison of thermal conductivities of plastics and metal: the higher the thermal conductivity of the material, the smaller the difference in temperature between both pointsEn ligne : https://drive.google.com/file/d/1dtsdpVbwWksFJP2uhQLGbFYRAGCmWf2F/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36178
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 6 (2021) . - p. 41-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22867 - Périodique Bibliothèque principale Documentaires Disponible Metal substitution with improved PA / Jens Cremer in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 10 (2020)
[article]
Titre : Metal substitution with improved PA : Special polyamides 6 match the properties of polyamide 66 Type de document : texte imprimé Auteurs : Jens Cremer, Auteur ; Andreas Stockheim, Auteur Année de publication : 2020 Article en page(s) : p. 47-49 Langues : Anglais (eng) Catégories : Composites à fibres de carbone -- Propriétés mécaniques
Energie -- Absorption
Essais de résilience
Essais dynamiques
Flexion trois points
Matières plastiques -- Produits de remplacement
Métaux -- Suppression ou remplacement
Polyamide 6
Polyamide 66
Résistance à la traction
Résistance au chocsIndex. décimale : 668.4 Plastiques, vinyles Résumé : Replacing metal with polyamides (PA) in components can not only reduce weight and costs, but also offers ‧developers greater design freedom. However, this requires materials with improved mechanical properties. A new PA6 series with greater stiffness and strength meets these requirements, not only as a substitute for metals but also replacing PA66 in components. Note de contenu : - Combining the advantages of PA6 and PA66
- Alternative to PA66-GF50
- 20 percent higher energy absorption in a crash
- Improved property profile with good aging resistance
- Fig. 1 : Profile of elastic modulus against temperature for Ultramid B3WG7 XP BK23346 in comparison with a PA6-GF35 and a PA66-GF35 in the dry and conditioned states : the material has similar values to a PA66 over the entire temperature range
- Fig. 2 : Tensile strength against temperature for Ultramid B3WG7 XP K23346 in comparison with a PA6-GF35 and a PA66-GF35 in the dry and conditioned states : the tensile strength is clearly above that of a standard PA6 and is comparable to that of a PA66
- Fig. 3 : Comparison of notch impact strength (left) and impact strength (right) at room temperature and at -30°C between Ultramid B3WG7 XP
BK23346 and a PA6-GF35 and PA66-GF35 respectively : in both cases, the material surpasses the comparison materials
- Fig. 4 : A 3-point bending test showed that the maximum necessary work of fracture for Ultramid XP grades which exceeds that of com¬parable PA6 and PA66 grades
- Fig. 5 : For crash tests, so-called "crash domes"were driven against a metal wall at 8.5 m/s.The domes made of Ultramid XP achieved high energy absorption values
- Fig. 6 : In the crash tests, the Ultramid XP products show an approximately 20% higher energy absorption in each case compared with the corresponding standard products
- Table 1 : Characteristic values of the 3-point bending test on the partEn ligne : https://drive.google.com/file/d/1JPZGGnavXuBszj9-cC4ew2jt5gsbRisa/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34943
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 10 (2020) . - p. 47-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22447 - Périodique Bibliothèque principale Documentaires Disponible More cost-effective than metal / Albert Flepp in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 8 (08/2012)
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Titre : More cost-effective than metal Type de document : texte imprimé Auteurs : Albert Flepp, Auteur Année de publication : 2012 Article en page(s) : p. 48-49 Langues : Anglais (eng) Catégories : Composites
Coût -- Contrôle
Métaux -- Suppression ou remplacement
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Polymères hautes performances
PolyphthalamideIndex. décimale : 668.4 Plastiques, vinyles Résumé : Polyamides - The substitution of metals has been one of the most important drivers for the growth of the use of plastics for many years. Particularly in the high-performance segment, polyamides with different forms of modification can cost-effectively replace conventional die-cast metals, while at the same time reducing the weight. Note de contenu : - Wide use thanks to additional properties
- Reducing processing costs
- Service and experiencePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17079
in KUNSTSTOFFE INTERNATIONAL > Vol. 102, N° 8 (08/2012) . - p. 48-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14079 - Périodique Bibliothèque principale Documentaires Disponible Towards the functionalized FRP Tube / Udo Engelmann in KUNSTSTOFFE INTERNATIONAL, Vol. 107, N° 12 (12/2017)
[article]
Titre : Towards the functionalized FRP Tube : A merger of hydroforming and injection molding technologies is driving lightweight design Type de document : texte imprimé Auteurs : Udo Engelmann, Auteur ; Markus Layer, Auteur ; André Albert, Auteur ; Eckhard Reese, Auteur ; Dirk Landgrebe, Auteur ; Lothar Kroll, Auteur ; Wolfgang Nendel, Auteur Année de publication : 2017 Article en page(s) : p. 11-14 Langues : Anglais (eng) Catégories : Automobiles -- Pièces
Composites à fibres
Composites à fibres -- Hydroformage
Matériaux -- Allègement
Matières plastiques dans les automobiles
Métaux -- Suppression ou remplacement
TubesIndex. décimale : 668.4 Plastiques, vinyles Résumé : In the Federal German Excellence Cluster "Merge", new processes for hydroforming-injection molding for processing thermoplastic fiber composites are being researched. With gas as a forming and supporting medium, fiber-reinforced plastic tubes have been processed for the first time. In specific applications, researchers succeeded in reducing the part weight and process costs, and increasing productivity. Note de contenu : - Hybrid high performance parts
- Hydroforming/Injection molding of FRP hollow profiles
- Optimization of the process chain for use of FRP hollow profiles
- FIGURES : 1. Process chains for manufacturing hybrid structures. The merger of metal, plastic and FRP-specific processes pursues the goal of combining the individual manufacturing steps with one another appropriate to the component - 2. Combining hydroforming and injection molding in situ eliminates certain process steps. Forming, primary shaping and assembly take place in one mold - 3. Hybrid parts of complex formed metal hollow profiles and functional injection molded components are used in car models as cockpit crossmembers, front-end carriers and front-end adapters - 4. Examples of a high-qulaity over-molded FRP semi-finished product : 1) adhesive-bonded connection, 2) injection molded functional element, 3) FRP tube - 5. Before injection molding, the FRP tube is heated. Components and mode of operation of the infrared heating oven : 1) infrared radiator, 2) transport clips, 3) FRP tube, 4) stepping motorEn ligne : https://drive.google.com/file/d/1lSX9hbggBaB_0bk036Rcv1aTfEKsMmwe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29673
in KUNSTSTOFFE INTERNATIONAL > Vol. 107, N° 12 (12/2017) . - p. 11-14[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19448 - Périodique Bibliothèque principale Documentaires Disponible