音弾性スペクトラム法による応力分布の測定

概要

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The acoustoelastic spectrum method was applied to analyze plane stress distribution in a U notched aluminum alloy specimen. In the experiment, ultrasonic transverse waves were propagated normal to the surface, and the amplitude spectra of their echoes were analyzed by FFT to find frequency components of null amplitude. From this, two polarization directions and the difference of two transverse velocities were determined. Since the orthogonality of polarization directions thus obtained was a little insufficient, averaging to make them orthogonal proved significant in this stress analysis. Applying these results to the acoustoelastic law of slightly orthotropic materials, the normal stress difference and shear stress were obtained, and each normal stress was subsequently determined by the shear difference method. These stress distributions were in good agreement with the FEM rosults. Since only a few particular frequency components were used in this spectrum method. an improvement using spectral profiles was also considered.
社団法人日本機械学会の論文
1997-06-25