MATHEMATICAL-MODEL FOR TENSILE BEHAVIOR OF HYBRID CONTINUOUS FIBER CEMENT COMPOSITES

A mathematical model has been developed for the tensile behaviour of c ement composites reinforced with two types of continuous and unidirect ional aligned fibres. The model is based on the theory for single fibr e composites proposed by Aveston, Cooper and Kelly(1). Theoretical cur ves have been obtained for the tensile properties of the polypropylene /glass fibre-reinforced cement composites by means of substituting par ameters into the developed equations, and these curves were compared w ith experimental results for a limited range of fibre combinations. It is shown that to attain optimum hybrid effects for toughness and the first maximum point of the stress-strain curve, the correct fibre volu me combinations should be included.