Skip to main content
SpringerLink
Log in

Specific Features of Excitation and Propagation of Longitudinal and Transverse Subsurface Waves in Solids: II. Effects of Some Boundary Conditions on Formation of Acoustic Fields

  • Acoustic Methods
  • Published:
Russian Journal of Nondestructive Testing Aims and scope Submit manuscript

Abstract

Modification of boundary conditions for propagation of transverse and longitudinal subsurface waves by covering a specimen's boundary surface with a layer of liquid may significantly affect amplitude P A and the form and directivity characteristic (DC) of a subsurface wave (SW) source in a near-surface zone even in the case when the ratio of acoustic impedances of coupling media is m 12≈0.1. Dependences of the wave amplitude and the DC of probes of transverse and longitudinal SWs on geometric parameters of a rectangular protrusion located on the surface of the inspected solid body and on the wave frequency are established. The DC of a transverse-SW source has two global maxima located in the volume of the raised area and beneath it. These maxima are due to superposition of the fields belonging to the principal ST mode and to an additional mode transformed on the protrusion's edge. The studies performed have shown an increase in the sensitivity to flaws located beneath the extension of the coupling surface's plane in the protrusion's volume or above it.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

REFERENCES

  1. Brekhovskikh, L.M. and Godin, O.A., Akustika sloistykh sred (Acoustics of Layered Media), Moscow: Nauka, 1989.

    Google Scholar 

  2. Heelan, P.A., On the Theory of Head Waves, Geophys., 1953, vol. 18, no.4, pp. 871–893.

    Article  Google Scholar 

  3. Burger, C.P. and Riley, W.F., Effects of Impedance Mismatch on the Strength of Waves in Layered Solids, Exp. Mech., 1974, vol. 14, no.4, pp. 129–137.

    Google Scholar 

  4. Gurvich, A.K. and Kuz'mina, L.I., Spravochnye diagrammy napravlennosti iskatelei ultrazvukovykh defektoskopov (Reference Directional Diagrams for Selectors of Ultrasonic Flaw Detectors), Kiev: Tekhnika, 1980.

    Google Scholar 

  5. Ermolov, I.N., Razygraev, N.P., and Shcherbinskii, V.G., Study of the Process of Formation of a Head-Wave Acoustic Field in a Monitored Medium, Defektoskopiya, 1978, no. 11, pp. 5–10.

  6. Viktorov, I.A., Zvukovye poverkhnostnye volny v tverdykh telakh (Surface Acoustic Waves in Solids), Moscow: Nauka, 1981.

    Google Scholar 

  7. Ermolov, I.N., Razygraev, N.P., and Shcherbinskii, V.G., Ultrasonic Wave Attenuation with Distance, Defektoskopiya, 1979, no. 1, pp. 37–40.

  8. Nikiforov, L.A. and Kharitonov, A.V., Parameters of Subsurface Longitudinal Waves Excited by Wedge-Type Transducers, Defektoskopiya, 1981, no. 6, pp. 80–85.

  9. Gitis, M.B. and Khimunin, A.S., On the Diffraction Effects in Surface Sounding, Defektoskopiya, 1991, no. 9, pp. 52–55.

  10. Ermolov, I.N., Metody ultrazvukovoi defektoskopii: Kurs lektsii (Lectures on Methods of Ultrasonic Flaw Detection), Moscow: 1966.

  11. Krautkramer, J. and Krautkramer, H., Werkstoffprufung mit ultraschall, Berlin: Springer, 1986. Translated under the title Ultrazvukovoi kontrol' materialov. Spravochnik, Moscow: Metallurgiya, 1991.

    Google Scholar 

  12. Ermolov, I.N., Razygraev, N.P., and Scherbinskii, V.G., Selectors for the Inspection of a Surface Layer Using Head Waves, Defektoskopiya, 1981, no. 1, pp. 53–62.

Download references

Author information

Authors and Affiliations

  1. Institute of Applied Physics, Belarussian Academy of Sciences, Akademicheskaya ul. 16, Minsk, 270072, Belarus

    A. R. Baev & M. V. Asadchaya

Authors
  1. A. R. Baev
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. M. V. Asadchaya
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

__________

Translated from Defektoskopiya, Vol. 41, No. 9, 2005, pp. 32–43.

Original Russian Text Copyright © 2005 by Baev, Asadchaya.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Baev, A.R., Asadchaya, M.V. Specific Features of Excitation and Propagation of Longitudinal and Transverse Subsurface Waves in Solids: II. Effects of Some Boundary Conditions on Formation of Acoustic Fields. Russ J Nondestruct Test 41, 577–585 (2005). https://doi.org/10.1007/s11181-006-0004-9

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11181-006-0004-9

Keywords

Search

Navigation