J. Phys. IV France 01 (1991) C3-727-C3-732
DYNAMIC FRACTURE RESISTANCE OF Al2O3 AND SiCw /Al2O3L.R. DEOBALD and A.S. KOBAYASHI
Dept. of Mechanical Engineering, FU-10, University of Washington, Seattle, WA 98195, U.S.A.
A bar impact test was developed to study the dynamic fracture responses of precracked ceramic bars, Al2O3 and 15/29% volume SiCw/Al2O3. Laser interferometric displacement gage data was used together with dynamic finite element analysis to determine the instantaneous crack length and the dynamic stress intensity factor, KID(t), in the fracturing ceramic bars impacted with impactor velocities of 5.8, 8.0, and 10 m/s. The crack velocities increased from 1400 to 2600 m/s with increasing impact velocity. The dynamic initiation fracture toughness and an increasing KID(t) with time and with increasing impact velocity were obtained.
© EDP Sciences 1991