Abstract
The adhesion of thermoplastic matrices to E-glass fibres has been investigated by means of the fragmentation, microtension and three-fibre tests. In neither the microtension nor the fragmentation test did fibre/matrix debonding occur in the region of matrix elastic deformation for most of the glass/polymer systems studied. Nevertheless, we succeeded in achieving adhesional failure in pull-out techniques by using the three-fibre method, and in the fragmentation test by stretching the thermoplastic matrices until the formation of a neck of maximum possible length. The fibre/matrix bond strengths calculated for the neck from the Kelly formula are greater than those that were obtained from the three-fibre test extrapolated to zero embedded length according to Greszczuk's model. It can be considered as a local (ultimate) adhesional strength.For all matrices investigated, the ‘interfacial shear strength’ exceeded the matrix shear strength. To account for this result, a two-stage model of failure of a single-fibre composite is proposed which involves matrix shear at some distance from the fibre surface (at the matrix/interphase boundary) and subsequent interphase debonding from the fibre.
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