パワーケプストラムによる音弾性複屈折法

概要

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Acoustoelastic birefringence is measured with a computerized cepstrum analysis. An ultrasonic transducer emits a broad-band shear wave pulse, polarized about 45° from the principal axes, into the stressed material. Due to the stress-induced anisotropy, it splits into a pair of shear waves polarized along the principal directions, which propagate with different velocities. The same transducer receives them together and sends the resultant signal to a microcomputer, where the signal is Fourier-transformed twice to reduce the power-cepstrum as a function of quefrency. The quefrency where the cepstrum takes the maximum peak gives the transit-time difference of the polarized shear waves. The experiment is done by uniaxially loading the specimens of aluminum alloy 7075-T 651 The results of the cepstrum analysis agree with the conventional sing-around measurements.
社団法人日本機械学会の論文
1989-04-25