FIRST EVALUATIONS OF NON LINEAR ELASTIC EFFECTS IN LGT CRYSTALS BY COMBINED PULSE-ECHO AND RESONATOR METHODS

摘要

Non linear elastic effects in LGT crystals have been measured by two different methods : pulse-echo wave velocity measurements under hydrostatic pressure and diametrical compression of thickness-shear resonators. The same samples of LGT crystals have been used to fabricate both kinds of samples so a direct comparison of non-linear elastic effects between both experiments are meaningful.