, Volume 7, Issue 11, pp 1315-1321

On the re-inforcement of thermoplastics by imperfectly aligned discontinuous fibres

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Studies of deformation behaviour of short fibre reinforced thermoplastics are complicated by the facts that usually a wide range of fibre lengths are present in moulded test pieces and that the fibres are not systematically oriented with respect to any test direction. An equation has been derived for the stress/strain curve of such a material. This has been used to determine fibre/matrix bond strengths in two glass/nylon 6.6 and two glass/polypropylene composites from measured stress/strain curves and fibre length distributions.

It is concluded that major improvements in the properties of these materials will only be achieved by modifying processing to retain longer fibres.