Abstract
The effect of porosity on the mechanical properties of composites made from brittle, particulate matrices has been studied using glass fibre-reinforced gypsum plaster as the model. Composite boards were prepared by the spray-suction method which produces a random two-dimensional arrangement of the chopped fibre in the matrix. Variation in the porosity occurred as a result of changing the proportion and length of the reinforcement. Beyond optimum fibre volume percentages, both tensile and bending strengths of the glass fibre-reinforced gypsum plaster decrease and this reduction is related to the increase in porosity which accompanies the addition of relatively large quantities of a fibrous material to a particulate matrix. The effect on porosity of a change in fibre length is less pronounced, and is only significant for lengths exceeding 22 mm. Impact strength has been found to increase with both fibre length and fibre content up to the limits that were investigated. An attempt has been made to relate the porosity of the composite (over the range 20 to 40%) with the efficiency of reinforcement by discontinuous fibres. The shape of the tensile stress-strain curve can be explained in terms of this relationship.
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