1990 Volume 98 Issue 1139 Pages 653-657
The piezoelectric composite-bar method was applied to elastic modulus measurement of ceramics (zirconia, alumina, silicon nitride and silicon carbide). The procedure of measurement was simplified by using quartz vibrators with various resonant frequencies and grease as the adhesive. The resonant frequency fs of the specimen was observed to depend on the resonant frequency fq of the vibrator. The value of fs was maximum at fs=fq. The most probable value of fs (fs0) is obtained at fs=fq, and was determined by plotting fs against fq. The experimental error in fs was evaluated by the plot of fs vs. fq (fs/fs0 vs. fq/fs0) and was smaller than 0.1%, when the difference between fq and fs0 was 10%. The value of Q-1 was observed to be minimum at fq/fs0=1.
