An analysis of composites for any fibre orientation and an adhesion efficiency between the fibre and the matrix is given. The special cases of unidirectional, crossed and random reinforcement are evaluated. The manufacture and testing of some metal-thermoplastic composites are described. The moduli achieved are then compared with the theoretical predictions and the form of the dependence of the adhesion efficiency on fibre modulus/matrix modulus ratio, aspect ratio of fibres, time and loading history is discussed. The relative performance is compared on a basis of stiffness per unit weight.
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