FRACTURE-BEHAVIOR OF POLYPROPYLENE-FIBER-REINFORCED CONCRETE - MODELING AND COMPUTER-SIMULATION

The proportion of fracture energy which is consumed by fibres during f racturing in uniaxial and biaxial loading of a composite (matrix plus fibre) can be calculated by means of a modified model. By the method o f variation of parameters, the calculated load/displacement curve is a dapted to the measured load/displacement curve. The fibre component of the measured load/displacement curves ir obtained by subtracting the experimentally determined matrix component from the measured load/disp lacement curve of the composite material. By these parameters it is po ssible both to represent the load/displacement curve of every single f ibre for each relative position, and to determine the change of the fr acture energy with increasing compressive loading, sigma(1), of the sp ecimens. (C) 1996 Elsevier Science Limited