Advanced diaphragm forming process for high temperature thermoplastic composite applications / Christian Hopmann in SAMPE JOURNAL, Vol. 48, N° 2 (03-04/2012)

[article]  inSAMPE JOURNAL > Vol. 48, N° 2 (03-04/2012) . - p. 24-29 Titre : Advanced diaphragm forming process for high temperature thermoplastic composite applications Type de document : texte imprimé Auteurs : Christian Hopmann, Auteur ; W. Michaeli, Auteur ; R. Schöldgen, Auteur Année de publication : 2012 Article en page(s) : p. 24-29 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres Composites thermoplastiques Hautes températures Matériaux -- Imprégnation Polysulfures de phénylène Renforts textiles Index. décimale : 668.4 Plastiques, vinyles Résumé : Continuous fiber reinforced plastics with a thermoplastic matrix are recyclable, weldable and suitable for many structural applications. Due to the short cycle times of about 1 minute, forming processes for thermoplastic composite parts are already capable of series productions. Two of the most important forming technique are matched die forming and diaphragm forming. The matched die forming provides short cycle times and high processing temperatures but requires complex and expensive molds. The diaphragm forming process enables the use of low cost tooling and machinery and provides a high degree of flexibility. On the other hand its processing temperature range is limited to 250°C due to the silicone diaphragms, which are used for cost-efficient series production. The paper presents a new processing technique that was developed at IKV Aachen and combines the advantages of both processes. These particularly are a big variety of processable matrices and low cost equipment with a high degree of flexibility. The developed machinery like the new handling system, the innovative IR-heating station and the modified forming technique are described in detail. The development focuses on a temporal reduction of the thermal load of the diaphragms by using them only for the forming process. As a result, the processing temperature range has been extended from 250°C to 320°C so that it is now possible to additionally process PA6, PA66 and PPS based prepregs. Note de contenu : - Project goals - EXPERIMENTATION : Material - Development of the new processing techniques - Process option 1 : Depositing the prepreg - RESULTS : Quality of the reproduction of the mold geometry - Mechanical properties of the molded parts - Material processable with the advanced processes Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13605 [article]

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Simulation opportunities by a three-dimensional calculation of injection moulding based on the finite element method / W. Michaeli in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 398-403 Titre : Simulation opportunities by a three-dimensional calculation of injection moulding based on the finite element method Type de document : texte imprimé Auteurs : W. Michaeli, Auteur ; S. Hoffmann, Auteur ; Marcus Kratz, Auteur ; Karl Webelhaus, Auteur Année de publication : 2001 Article en page(s) : p. 398-403 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Injection molding - The simulation of injection moulding is essential to meet quality requirements and to increase the efficiency of the design process. In this paper 3D-finite element model for the simulation of injection moulding is presented. The model’s capability comprises the calculation of velocity, pressure and temperature fields as well as the prediction of the flow front position. The numerical approach is mainly based on the Gale kin formulation. Special emphasis is placed on the handling of polymer compressibility in order to enable a realistic simulation of the packing phase. The numerical efficiency has been largely enhanced through the employment of an automatic time step control. In order to demonstrate the code’s capabilities and outline advantages and disadvantages over other simulation systems, the calculation results are compared to experimental data and to results obtained from other numerical models. DOI : 10.3139/217.1654 En ligne : https://drive.google.com/file/d/1EfOSVSA43KwCDxwJS0f8Nw4pGY12D6AJ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15924 [article]

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