Influence of stitching parameters on the joint strength of welded-stitched composites / Lisa-Maria Wittmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 5 (11/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 5 (11/2018) . - p. 706-713 Titre : Influence of stitching parameters on the joint strength of welded-stitched composites Type de document : texte imprimé Auteurs : Lisa-Maria Wittmann, Auteur ; Tobias Kleffel, Auteur ; Dietmar Drummer Année de publication : 2018 Article en page(s) : p. 706-713 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres Couture Polypropylène Soudage Soudures Température Index. décimale : 668.4 Plastiques, vinyles Résumé : Regarding the necessity of lightweight construction, performance and design, composites are well established. At this moment, the joining of these composites still is often a major challenge. While suitable technologies like welding, sticking or riveting do exist, there are several drawbacks of these technologies such as damaging the fiber structure and low bonding strength. The combination of welding and sewing is a novel approach to improve the bonding of glass fibre-reinforced polypropylene and the influence of the processing parameters is not yet well understood. This study aims at analyzing the influence of parameters such as operating temperature, overlap length, needle temperature and thread material on the tensile strength of thermoplastic composites joined in the previously described hybrid approach. Furthermore, the interaction between thread and composite material is investigated by a microscopical analysis. The joint strength has been found to depend on the overlap length of the joint and the results suggest a contribution of the seam to the joint strength, especially for lower overlap lengths. Influences of the processing temperature, the thread material and needle temperature are also present, however, due to the complex interaction, no systematic conclusions could be drawn for these yet. The optical analysis confirms the findings of thermoset composites stitched before impregnation, where additional seams cause dislocations and local agglomeration of fibers. Additional investigations are necessary to determine the effect of the stitching on the joint and to further the understanding of the interaction between composite and thread material. Note de contenu : - MATERIAL AND METHODS : Material - Stitching-process - Tensile test - Microscopical analysis - RESULTS AND DISCUSSION : Joint strength - Microscopical analysis DOI : 10.3139/217.3518 En ligne : https://drive.google.com/file/d/1ItGkRQ1gYZH-2Hdahkdlkqx42eZYpTz6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31410 [article]

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Radiation crosslinking of films / Lisa-Maria Wittmann in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 10 (10/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 10 (10/2019) . - p. 112-116 Titre : Radiation crosslinking of films : New applications in the thermoforming of filled materials Type de document : texte imprimé Auteurs : Lisa-Maria Wittmann, Auteur ; Dirk Fischer, Auteur ; Dietmar Drummer , Auteur Année de publication : 2019 Article en page(s) : p. 112-116 Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Composites -- Thermoformage Composites à fibres de verre Films plastiques Matières plastiques -- Thermoformage Photoréticulation Polyamide 12 Polyéthylène haute densité Polymères semi-cristallins Résistance à la fusion Index. décimale : 668.4 Plastiques, vinyles Résumé : Irradiating semi-crystalline thermoplastics induces three-dimensional crosslinking in the macromolecules. Radiation crosslinking has long been used in the production of injection molded parts. Radiation crosslinking of films, on the other hand, offers hitherto untapped potential for new applications in the thermoforming of filled materials. Note de contenu : - Main applications in thermoforming - Increased melt strength due to crosslinking - Semi-crystalline thermoforming of thermoplastics - Thermoforming of filled systems - Radiation crosslinking - Figure : Radiation source : an electron accelerator of 3 MeV maximum energy. Electrons released froom a hot cathode are collimated into a beam and accelerated via alternating electric fields - Fig. 1 : Melt strength : comparative storage modulus of amorphous, semi-crystalline and semi-crystalline radiation-crosslinked polymers - Fig. 2 : Thermoformed polyamide 12 semi-finished products : sample parts to illustrate ther thermoforming studies - Fig. 3 : Dynamic-mechanical analysis of glass-fiber filled radiation-crosslinked films of different filler content and energy doses (absorbed energy per mass ; unit : Gray) - Fig. 4 : Comparative thermoformability of unfilled and glass-fiber-filled as well as non-crosslinked and crosslinked HDPE semi-finished articles - Fig. 5 : Hencky strain in the final thermoformed part as a function of fiber orientation (HDPE containing 10 vol. % glass fiber En ligne : https://drive.google.com/file/d/1Bzon-cJ4MGC5r77JsEX_nBOCQWRU-kXL/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33804 [article]

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