Longitudinal and transverse wave attenuation estimations

Thomas, Seldis

doi:10.1784/insi.2015.57.11.613

Cited by 2 publications

(1 citation statement)

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“…The attenuation coefficient is sensitive to the microstructure of a material, and has been widely used in the nondestructive evaluation of material properties such as hardness, grain size, porosity and fatigue [1][2][3]. To our knowledge, the attenuation coefficient of shear waves may be much larger than that of longitudinal waves at the same driving frequency [4], and may therefore offer additional advantages over longitudinal wave attenuation for characterizing slight changes in the microstructure. Since the generation and propagation of ultrasonic shear waves are different from those of longitudinal waves [5], most experimental techniques for measuring longitudinal wave attenuation cannot be directly applied in the measurement of shear wave attenuation.…”

Section: Introductionmentioning

confidence: 99%

Measurement of shear wave attenuation coefficient using a contact pulse-echo method with consideration of partial reflection effects

Zhang

Liu

et al. 2019

Meas. Sci. Technol.

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Accurate measurements of the ultrasonic shear wave attenuation coefficient are essential for the quantitative nondestructive evaluation of the microstructure of a material. This work provides an experimental technique for measuring this coefficient using a contact method. The first and second pulse-echo shear wave signals are measured and are used to calculate the frequency-dependent attenuation coefficient; in this process, the diffraction and the diffractionaffected partial reflection coefficient are corrected to improve the accuracy of measurement. The diffraction coefficient is calculated from measurements of the shear wave velocity, and the partial reflection coefficient is determined experimentally by using another transducer on the opposite side and taking into account wave diffraction effects. The shear wave attenuation coefficient is determined for samples of different thicknesses, and these results show good agreement over a broadband frequency, thus validating the proposed method. The advantage of discriminating the porosity of additive manufacturing materials using shear wave attenuation is demonstrated, and the practical benefits of accurately measuring the shear wave attenuation coefficient using the proposed method are also discussed.

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