Model specimens, each containing five embedded continuous sisal fibres in an epoxy matrix, were subjected to four-point bending tests. The micro-failure behaviour of sisal fibres was examined using scanning electron microscopy (SEM). Interfacial debonding of both sisal fibre bundle/epoxy matrix and tubular micro-fibre/bonding material was also noted in all embedded fibres. The fibre bundle/matrix interface had a moderate high strength; but the adhesive strength between the micro-tubular fibre and the bonding material appeared to be small.
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Bai et al. (1999) studied this question.
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