Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1273-C7-1276
Comparison of fracture toughness measuring methods applied on silicon nitride ceramicsE. RUDNAYOVÁ, J. DUSZA and M. KUPKOVÁ
Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 043 53 Ko[MATH]ice, Slovakia
Different fracture toughness testing methods on unreinforced and with Si3N4 whiskers reinforced silicon nitride ceramics were compared. The results revealed that in the reinforced ceramics the KIC rises with the increasing of the crack size, which indicates a rising R-curve behaviour in this system. Using IF testing method equations given by Niihara and by Shetty proved to have the nearest values to these achieved using SENB in both investigated systems.
© EDP Sciences 1993