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Risultati sfruttabili
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.
Traditional manufacturing processes for continuous fibre reinforced thermoplastics are characterized by excess energy requirements and long cycle times. Therefore research has focused on the development of a dielectric heating process for these types of materials to get a fast and energy efficient production process. The process has been successfully developed on a laboratory scale. Further research will focus on scaling up.
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.
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