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Butt-joined, thermoplastic stiffened-skin concept development / A. Offringa in SAMPE JOURNAL, Vol. 48, N° 2 (03-04/2012)

[article]  inSAMPE JOURNAL > Vol. 48, N° 2 (03-04/2012) . - p. 7-15 Titre : Butt-joined, thermoplastic stiffened-skin concept development Type de document : texte imprimé Auteurs : A. Offringa, Auteur ; J. W. van Ingen, Auteur ; A. Buitenhuis, Auteur Année de publication : 2012 Article en page(s) : p. 7-15 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Avions -- Fuselage Avions -- Matériaux Composites à fibres de carbone Composites thermoplastiques Joint d'about Polyéthers cétone cétone Polymères hautes performances Thermodurcissables Index. décimale : 668.4 Plastiques, vinyles Résumé : A novel thermoplastic skin concept, with co-consolidated stringers, is being brought to technology readiness level (TRL) 6. This implies manufacturing and mechanical testing of full scale demonstrator products. The stringers are T-shaped and made of flat preforms that are butt jointed to each other and to the panel skin. An injection molded filler increases strength. The skin is fiber placed over the stringer preforms and the product is co-consolidated at melt temperature. Because of the butt-joints, manufacturing is relatively simple. The result is a tough thermoplastic product that can compete on weight and cost with state-of-the-art thermoset composite panels. Development and testing of the panel concept is being done in a step-by-step process. Consecutive building blocks are: coupons, three-stringer subcomponent panels and finally full scale skin panels. The main panel represents the mid-section of a business jet horizontal tail. The panel will be assembled into a 12 meter span torsion box and tested in the second half of 2011. Note de contenu : - INTRODUCTION : General - Current thermoplastic composite applications - Thermoplastic growth potential - LARGE THERMOPLASTIC STRUCTURES : Current state-of-the-art thermoset panels - First large thermoplastic structures and discovery of the thermoplastic butt-joint - Butt joint research up to a panel concept - The TAPAS Project and the Road to TRL6 - Design of the torsion box demonstrator - SKIN PANEL DEVELOPMENT : Stringer design and development - Skin design, development and manufacture - Cost modeling - FULL SCALE TESTING Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13604 [article]

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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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