Elastic constants of synthetic sapphire at 27°C

Abstract

The six elastic stiffness constants of synthetic sapphire were independently determined by pulse-echo and continuous-wave (cw) resonance measurements at a frequency of 15 Mc. The values obtained from the pulse-echo measurements are C11=4.902, C33=4.902, C 44=1.454, C12=1.654, C13=1.130, C 14=-0.232, in units of 1012 dyncm2. The results obtained from the cw resonance measurements are C11=4.920, C 33=4.920, C44=1.468, C12=1.684, C 13=1.164, C14=-0.234, in units of 1012 dyncm2. The results of the present investigation are compared with recent resonance measurements in the kc frequency range and with earlier work in the Mc range. © 1963 The American Institute of Physics.