Abstract
The mechanisms involved in the isothermal consolidation of woven carbon fibre-reinforced polyetherimide (PEI/WCF) have been studied. Press-formed samples were processed in a matched-die mould equipped with pressure and temperature transducers. Optical microscopy and fracture tests were used to determine the evolution of consolidation as a function of three processing parameters namely pressure, temperature and time. The mechanisms of intimate contact and fibre impregnation were found to be responsible for void resorption. At normal processing temperatures the inter-ply interfacial strength is governed by resin flow at the interface and the mechanism of fibre impregnation limits the rate of consolidation. A model which accounts for resin flow through the fibre bed, for the formation of intimate contact and for autohesion between adjacent plies has been proposed to predict the consolidation of PEI/WCF. Predictions obtained using this model have shown good agreement with experimental results.
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