10.14489/td.2025.01.pp.004-012

2025, 01 January

DOI: 10.14489/td.2025.01.pp.004-012

Shevaldykin V. G.
THE DEPTH OF PENETRATION INTO THE METAL LONGITUDINAL-SURFACE (HEAD) ACOUSTIC WAVE
pp. (4-12)

Abstract. The depth distribution of the amplitude of the longitudinal displacement components in an inhomogeneous longitudinal-surface acoustic wave has been experimentally studied. A steel sample was used to protect the studied signal from extraneous types of waves. The distribution, plotted for depths from zero to 10 mm, in a smoothed form represents a smooth curve with a maximum at a depth of 6.5 mm, which corresponds to an angle of 12.3° to the metal surface. Deviations from the smoothed curve do not exceed 1.8 dB. A longitudinal-surface wave excites a longitudinal subsurface wave. Due to their common cylindrical front, the signals in the vertical section lag behind the signal on the surface for a time increasing with depth. The depth at which this time is equal to 0.1 of the oscillation period of the signal can be considered the penetration depth of the longitudinal-surface wave.

Keywords: ultrasonic testing, head wave, inhomogeneous longitudinal-surface wave, lateral transverse wave, creeping wave, longitudinal subsurface wave, critical angle.

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V. G. Shevaldykin (Acoustic Control Systems Ltd, Moscow region, Leninsky district, village Gorki Leninskie, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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