Abstract
The generation of the second harmonics of sound waves propagating in uniaxially stressed cubic crystals was discussed on the basis of the nonlinear thermoelasticity theory. The direction of the applied stress was chosen as , , or , and the pure-mode wave propagation along the directions perpendicular of parallel to the stresses was considered. The stress derivative of the amplitude of the harmonic wave was expressed as a function of the second-, the third-, and the fourth-order elastic constants. Eight cases with different stress directions and wave characters were found to be independent. It was shown that, together with four cases in the hydrostatically stressed crystals, all eleven fourth-order elastic constants could be determined through the harmonic generation experiments.
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