Title: MEASUREMENT OF THE AVERAGE PERMEABILITY OF NATURAL FIBRE MATS IN RESIN TRANSFER MOULDING APPLICATION
Page Range: p.229-238
Author(s): Rouison D; Couturier M; Panthapulakkal S; Sain M
File size: 209K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 14
Issue No: No. 3
Abstract
The permeability of hemp fibre mats used in a resin transfer moulding process were computed from the measured mould filling time using a simplified mathematical approach. This approach could be applied because of the simple geometry of the mould and because a certain number of assumptions were made. The main assumption, which stated that the flow front of the resin was sharp and symmetric, was verified by observing some unfinished parts. Further simplification of the solution resulted in a non-dimensional number that was used for the computation of the permeabilities. In order to take into account the approximations made in the model, the solution was calibrated using data from the literature and experimental results for a 20% glass fibre preform. From this number, the permeability obtained from the experimental measurement of the injection time was found to decrease with increasing fibre content. The values obtained for hemp were lower than for glass fibres. This preliminary work is claimed to show the importance of studying the permeability of natural fibre systems in order to provide the data necessary for the proper design of industrial moulds. 18 refs.
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