Author/Authors :
Pearce، نويسنده , , D.H. and Janczak، نويسنده , , J. and Boccaccini، نويسنده , , A.R. and Ponton، نويسنده , , C.B. and Rohr، نويسنده , , L.، نويسنده ,
Abstract :
The mechanical and elastic properties of a unidirectional monofilament sapphire fibre reinforced mullite matrix composite have been evaluated. Youngʹs modulus measurements made using Försterʹs technique indicate an increase in stiffness in line with fibre additions. Flexural strength testing of the composite has shown a failure stress of 475 MPa for a fibre volume fraction of 0.115. The fracture behaviour indicates that failure occurs mainly by mixed mode cracking (delamination), with crack deflection around the fibre reinforcements. Push-through indentation testing results have indicated a strong fibre—matrix interface, the strength being comparable to that of the matrix material shear strength. Thus the material has yet to be optimised in terms of composite behaviour. Potential methods of improving the material are suggested.
