Mechanical and Fractographic Analyses of Monolithic Si3N4 Ceramics during Impact Testing
A comprehensive experimental and theoretical work aiming at studying the dynamic failure process of silicon nitride ceramics has been recently started. The main goal of this research programme consists in characterizing the mechanical behaviour of the material under dynamic loading as well as investigating the dynamic failure process using micro- and macro-fractography. The current paper deals with the phenomenon of special rate dependence of KId dynamic fracture toughness of Si3N4 based ceramics. The KId values have been determined during instrumented impact test on the one hand based on the dynamic key curve method using notched specimens, on the other hand based on fractographic analyses of fracture surface of impacted unnotched samples.
J. Dusza, R. Danzer, R. Morrell and G.D. Quinn
M. B. Maros et al., "Mechanical and Fractographic Analyses of Monolithic Si3N4 Ceramics during Impact Testing", Key Engineering Materials, Vol. 409, pp. 338-341, 2009