1 An aligned short fibre composite was produced by resin moulding with the follo

Question

1 An aligned short fibre composite was produced by resin moulding with the following characteristics; Volume fraction of 0.35 (35%) glass fibres . Fibre diameter is 16 um and length is 10 mm Fibre fracture strength, which equals the fibre tensile strength is 2.0 GPa Matrix strength is 95 MPa The shear strength at the fibre/matrix interface is 1.1 MPa a) Calculate the tensile strength of the composite. b) Calculate the percentage of reinforcement efficiency. c) Suggest ways to improve reinforcement efficiency.

Explanation / Answer

a) Max Tensile Strength =Maximum Stress

= F/A = 95/ ((3.142×16×16)/4×35%)

= 1.35

b)percentage of reinforcement efficiency = 2000Mpa/95Mpa =21.05 /95 =0.2263 =22.63%.

c)Reinforcement Efficiency can be improved by :

. Increasing the fibre area in the mould.

. Decreasing the length i.e the slenderness ratio.

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