Abstract
The dynamic fracture responses of alumina (Al 2O 3), TiB 2 particulate-SiC matrix and SiC whisker (SiC w)-Al 2O 3 matrix ceramic composites are presented in the context of dynamic fracture mechanics where a dynamic arrest stress intensity factor (SIF) did not exist in these brittle materials. Fractography study of the Al 2O 3 specimens showed that the area of transgranular failures increased from about 3% to about 16% under rapid crack extensions in statically and impact-loaded specimens respectively. Thus the continuing crack propagation at low SIF was attributed to increasing transgranular failure due to the kinematic constraints imposed by flat crack extension. The fracture process zone was also identified as the dominant energy dissipation mechanisms in SiC wAl 2O 3 ceramic matrix composite.
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