Comparison of fibre reorientation of short-and long-fibre reinforced polypropylene by injection molding with a rotating mold core / Philipp Land in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 1 (2023)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 1 (2023) . - p. 97-110 Titre : Comparison of fibre reorientation of short-and long-fibre reinforced polypropylene by injection molding with a rotating mold core Type de document : texte imprimé Auteurs : Philipp Land, Auteur ; Thorsten Krumpholz, Auteur ; Hans-Peter Heim, Auteur Année de publication : 2023 Article en page(s) : p. 97-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par micro-injection Composites à fibres courtes Composites à fibres de verre -- Propriétés mécaniques Composites à fibres longues Distribution et orientation des fibres Moules à noyau rotatif Polypropylène Index. décimale : 668.4 Plastiques, vinyles Résumé : With a rotating mold core during the injection molding of fibre-reinforced plastics, the rotational shear caused by the rotation is superimposed on the injection-induced shear. This allows the fibre orientation in this area to be intentionally manipulated so that, for example, in the case of internal pressure loading, the fibres can be oriented in the tangential main loading direction. This paper deals with the impact of a rotating mold core on the fibre orientation and burst strength of short-and long-fibre-reinforced polypropylene. It is shown that the fibre orientation and strength can be significantly influenced for both short and long fibres, whereby increases in bursting strength of mostly over 80%, in some cases over 200%, could be achieved. The ultimate strength depends, among other things, on the wall thickness used and the fibre content. Major differences between the short-and long-fibre-reinforced polypropylene are less evident in the strength and more in the fibre orientation. Note de contenu : - MATERIALS AND METHODS : Process implementation and manufacturing of test specimens - Materials - Burst pressure test - Fibre orientation analysis - RESULTS : Short-fibre reinforced PP - Long-fibre reinforced PP - Failure behavior DOI : https://doi.org/10.1515/ipp-2022-4252 En ligne : https://drive.google.com/file/d/13BYnremJZznNj0YGHJRLOJNM_8ThgSK1/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39198 [article]

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Design methodology for parts subject to internal pressure / Thorsten Krumpholz in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2022)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2022) . - p. 52-55 Titre : Design methodology for parts subject to internal pressure : Mold system with rotating core improves mechanical properties Type de document : texte imprimé Auteurs : Thorsten Krumpholz, Auteur ; Philipp Land, Auteur Année de publication : 2022 Article en page(s) : p. 52-55 Langues : Anglais (eng) Catégories : Composites à fibres courtes Composites à fibres de verre -- Moulage par injection Distribution et orientation des fibres Matières plastiques -- Rotomoulage Mesure Moules à noyau rotatif Moules d'injection Polypropylène Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : Internal pressure loads are typical for fiber-reinforced plastic components. To increase the burst strength of components, the fiber orientation can be modified in a targeted way during injection molding by means of a rotating mold core. A newly developed simulation method allows this modified fiber orientation to be taken into account at the design stage. Note de contenu : - Measurement of fiber orientation - Stages of the simulation methodology - Practical realization of a pressure-loaded component - Fig. 1. The superimposition of the injection-induced axial shearing by the tangential shearing due to the rotation selectively influences the fiber orientation in the tangential direction due to the rotation - Fig. 2. The rotation core can produce an increase in the tangential orientation component almost independent of the wall thickness (left). At correspondingly high speeds, the tangential fibers dominate the microstructure across the entire thickness (right) - Fig. 3. The layer-by-layer assignment of the fiber orientations, with the aid of Converse and S-Life-Plastics, enables the anisotropic structural simulation of rotated components - Fig. 4. Application of the simulation methodology allows, for the first time, the increased bursting strength due to rotation of the mold core also to be taken into account in the design of new components - Fig. 5. This application case shows a significant reduction of the utilization ratio due to manufacturing with a rotating core En ligne : https://drive.google.com/file/d/1M6AWx7jg_NhlQV9iEZQgQp3ZD7Dqb60K/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37311 [article]

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