Abstract
It is shown that the spectrum analysis of ultrasonic transverse waves is a useful tool for the acousto-elastic measurement of the difference and directions of principal stresses. The stress distribution chosen for the experiment is that in a center-holled plate specimen under tension. Ultrasonic transverse waves are incident normal to the specimen, and spectrums of the echos are analyzed. The transducer commonly used for sending and receiving waves is rotated to find the direction of incident vibration for which the spectral amplitude vanishes at some frequency. Such transducer direction and frequency are measured not only in a stressed state but also in a reference state of the specimen, and used for the acousto-elastic law in a slightly orthotropic material to determine the directions and difference of the principal stresses. In this experiment, the polarization directions of transverse waves changes only a little by the stress, and the precise measurement of this is required in a further study.
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