Better computation of fiber-reinforced engine components / Kristin Raschke in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 10 (10/2019) . - p. 118-123 Titre : Better computation of fiber-reinforced engine components : Precise prediction of the vibration behavior of structural parts through FEM simulation Type de document : texte imprimé Auteurs : Kristin Raschke, Auteur ; Wolfgang Korte, Auteur Année de publication : 2019 Article en page(s) : p. 118-123 Langues : Anglais (eng) Catégories : Automobiles -- Moteurs -- Pièces Composites à fibres courtes Composites à fibres de verre -- Propriétés mécaniques Distribution et orientation des fibres Eléments finis, Méthode des Matières plastiques dans les automobiles Polyamide 66 Prévision, Théorie de la Simulation par ordinateur Vibrations (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Fiber-reinforced plastics are playing an ever more important role in the development of low-noise engines. Taking the example of an automobile engine bracket, a method is presented here with which the vibration behavior of short fiber-reinforced structural parts can be more precisely predicted. The method developed is further characterized by its comparatively simple application and scalability. It therefore allows even large models to be efficiently computed. Note de contenu : - Computational prediction of the influence of fiber orientation - Experimental parameter identification - Validation on the part - Fig. 1 : Sound parths from the power unit to the driver's ear - Fig. 2 : Multi-scale material model : fundamentals for the computation of the composite material behavior on the basis of the reinforcing fibers and the matrix polymer - Fig. 3 : The integrative computation approach necessitated mapping between the computation models - Fig. 4 : Parameter identification for the anisotropic material model : the fiber orientation distributions determined experimentally in test specimens serve for calibration of the material model - Fig. 5 : Schematic test configuration and transmission behavior in the flexural vibration test - Fig. 6 : Flexural vibration test : result of the material model calibration - Fig. 7 : FEM model and test configuration : engine bracket on crankcase - Fig. 8 : Integrative computation approach : overview of the method for the engine bracket - Fig. 9 : Computed and measured natural frequencies of the engine bracket - Fig. 10 : Transmission function : anisotropic vs. isotropic simulation of the engine bracket, dotted line : measurement, solid line : FEM En ligne : https://drive.google.com/file/d/1exs-4CdN0BxuMb1LjnjHPq41vsOGL_Fh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33805 [article]

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Functional prototypes for car components / Fleurine Eberle in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 10 (2020)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 10 (2020) . - p. 36-39 Titre : Functional prototypes for car components : 3D printing shortens development times for load-bearing Parts under the hood Type de document : texte imprimé Auteurs : Fleurine Eberle, Auteur ; Jörg Schnorr, Auteur ; Kristin Raschke, Auteur ; Johannes Ruck, Auteur Année de publication : 2020 Article en page(s) : p. 36-39 Langues : Anglais (eng) Catégories : Automobiles -- Matériaux Composites à fibres Composites à fibres -- Propriétés mécaniques Impression tridimensionnelle Moteurs Polyamide 6 Prototypes Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Fiber-reinforced plastic components, including those for load-bearing areas, are established alternatives to metals in vehicle construction. It is not just their low specific weight that makes them interesting, but also their acoustic properties, which reduce noise transmission. As development cycles become ever shorter, the scope for protecting and coordinating components in their vehicle environment is becoming increasingly restricted. 3D printed prototypes, however, can help with acoustic assessments and optimization of engines or entire vehicles. Note de contenu : - NVH assessment of the entire vehicle - Materials classification - Theoretical background and simulation - Discussion of the numerical - Fig. 1 : Internal combustion engine and its connection to the vehicle structure via engine support and support (colored black) - Fig. 2 : Dry mix vs. powder bed mix and filler content vs. powder bed position - Fig. 3 : Boundary conditions for the statics simulation and the modal analysis and the optimized engine support - Fig. 4 : Numerical comparison of the flexural strength of the geometrical variants 1-5 - Fig. 5 : Deviation in eigenfrequency : comparison of the simulated eigen-frequencies of variants 4 and 3 (each made from Ultrasint PA6 MF). Reference (O%) is the engine support molded from Ultramid A3WG10 - Fig. 6 : Influence of printing direction on component strength, simulated with Ultrasim, and schematic representation of directional strength in all spatial directions. - Fig. 7 : Requirements profile and results of the statics component test performed and engine support unde operating temperatures for the critical load direction Z - Fig. 8 : Differences in 3D printed parts in the first four eigenfrequency positions, relative to the injection molded reference part, as measured on the component test rig - Fig. 9 : Measurements under operating conditions : measured differences in the first four eigenfrequency positions under operating conditions, expressed in terms of the injection molded part and the transfer functions - Table 1 : Materials data for Ultramid (Injection molding) and Ultrasint (3D printing), dry En ligne : https://drive.google.com/file/d/1qCPVChp-lW_0ZeK6o3iGX5uHFKAOphrL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34940 [article]

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