Abstract
The ultrasonic characterization of the stress state of a solid is usually based on the measurement of the stress acoustic constant evaluated at the stress free state for each material under investigation. For isotropic and quasi-isotropic solids and for crystals along nonrotated pure mode propagation directions the stress acoustic constant can be obtained from ultrasonic harmonic generation measurements. The relationships among the acoustic constant, the strain acoustic constant, and the ultrasonic nonlinearity parameters for solids will be derived. Experimental results verifying these relationships will be presented for a number of materials.
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