Objectif The objective of this project is the characterisation and modelling of the quality of the impregnation of the glass fibres by thermoplastics (polyethyleneterephthalate, polyamide-6,6 and polyetherimide) and the durability of the resulting thermoplastic composites. The objective of this project is the characterisation and modelling of the quality of the impregnation of glass fibres by thermoplastics (polyethyleneterephthalate, polyamide-6,6 and polyetherimide) and the durability of the resulting thermoplastic composites. Long cycle times and excess energy requirements are characteristics of the current fabrication process of the products out of semimanufacture tape. This research focusses on the improvement of the impregnation quality of the powder impregnation of bundles of fibres and development of a short cycle stamping process with dielectric heating. In this respect carbon black is added to polyetherimide to make this thermoplastic suitable for dielectric heating. The durability of the final product is investigated by hydrothermal ageing, environmental stress corrosion, fatigue, thermal cycling and creep.The impregnation of prepregs has been improved and a new dielectric heating process has been developed successfully for polyethyleneterephthalate (PET) and polyetherimide (PEI) composites. The process has good potential for polyamide-6,6 (PA66) composites, but needs further investigation. From the durability results it appeared that the consolidation phase after the heating step needs more consideration in future work.A lot of data has been produced on the durability of the various materials under different environmental and mechanical loads. They will be useful in assessing the behaviour of the different materials in practical use.PA66 and PEI composites appear to be suitable materials for temperatures up to 60 C in humid environments. Only PEI composite can stand higher temperatures and more severe environments such as acidic solutions.PET composite is not suitable as a construction materials in practical applications where a humid or corrosive environment occurs.The processing steps and the behaviour of the materials in different environments under different mechanical loadings such as creep and fatigue have been modelled. Software has been developed, which makes it possible to integrate design tools. This leads to predictions of environmental behaviour and durability as a function of the manufacturing route.With composites on the basis of thermoplastic matrices in comparison with thermoset matrices it is possible to get a better dimensioning of structures. Thermoplastic composites are expected to have an improved damage tolerance. Replacing thermosets by thermoplastics as matrix increases the delamination energy and the residual properties after impact. This can further be improved by using longer fibres. Long cycle times and excess energy requirements are characteristics of the current fabrication process of the products out of semi-manufacturing tape. This research focuses on the improvement of the impregnation quality of the powder impregnation of bundles of fibres and development of a short cycle stamping process with dielectric heating. In this respect carbon black is added to polyetherimide to make this thermoplastic suitable for dielectric heating. The durability of the final product will be investigated by: hydrothermal ageing, environmental stress corrosion, fatigue, thermal cycling and creep. Samples produced by different processing routes and after different loading histories will be investigated using simple mechanical tests, fracture surface analyses using SEM, DMTA, DSC, Raman- and FTIR-spectroscopy and microhadness. Champ scientifique natural sciencescomputer and information sciencessoftwarehumanitieshistory and archaeologyhistoryengineering and technologymaterials engineeringcomposites Programme(s) FP2-BRITE/EURAM 1 - Specific research and technological development programme (EEC) in the fields of industrial manufacturing technologies and advanced materials applications (BRITE/EURAM), 1989-1992 Thème(s) Data not available Appel à propositions Data not available Régime de financement Data not available Coordinateur N.V KEMA Contribution de l’UE Aucune donnée Adresse P.O. Box 9035 6800 ET ARNHEM Pays-Bas Voir sur la carte Coût total Aucune donnée Participants (5) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Integrated Aerospace Sciences Corporation Grèce Contribution de l’UE Aucune donnée Adresse Miaouli Street 22 18345 MOSCHATO Voir sur la carte Coût total Aucune donnée SNPE France Contribution de l’UE Aucune donnée Adresse Voir sur la carte Coût total Aucune donnée Universidad de Valladolid Espagne Contribution de l’UE Aucune donnée Adresse Plaza de Santa Cruz 47005 Valladolid Voir sur la carte Coût total Aucune donnée University of Paisley Royaume-Uni Contribution de l’UE Aucune donnée Adresse High Street PA1 2BE Paisley Voir sur la carte Coût total Aucune donnée École Nationale Supérieure des Mines de Paris France Contribution de l’UE Aucune donnée Adresse 60 boulevard Saint-Michel 75272 Paris Voir sur la carte Coût total Aucune donnée
