Regularities of propagation of waves in infinite body with initial stresses are used.
Main attention is directed towards determination of three-axial stresses.
This is a relatively new aspect in non-destructive ultrasonic methods. Main results of other authors are related to problems of determination of uniaxial stresses. Following main points are presented in this report. Derivation of main relations for isotropic materials foundations of method. Description of measurement procedure and analysis of accuracy of method presented.