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Observation of nonlinear acoustic effects at isotropic solid-solid interfaces.

J Chen1, W Jiang, Y Shui

  • 1The Institute of Acoustics, State Key Laboratory of Modern Acoustics, Nanjing University, People's Republic of China.

The Journal of the Acoustical Society of America
|March 16, 2001
PubMed
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Second harmonic generation of shear waves was studied at solid interfaces. Results show this phenomenon is sensitive to the interface

Area of Science:

  • Solid mechanics
  • Nonlinear acoustics
  • Materials science

Background:

  • Second harmonic generation (SHG) is a nonlinear acoustic phenomenon.
  • Understanding SHG at interfaces is crucial for material characterization.
  • Shear waves (SV waves) offer unique insights into interface properties.

Purpose of the Study:

  • To experimentally investigate second harmonic generation of SV shear waves at isotropic solid-solid interfaces.
  • To compare experimental results with theoretical predictions.
  • To assess the influence of interface physical state on SHG.

Main Methods:

  • Experimental measurement of shear wave amplitude at interfaces (glass-air, glass-iron, glass-copper, glass-aluminum).
  • Analysis of the angular relationship of the second harmonic wave amplitude.

Related Experiment Videos

  • Observation of SHG variations based on interface conditions.

    • Main Results:

    • The angular dependence of the second harmonic wave amplitude was measured.
    • Experimental results showed reasonable agreement with theoretical models.
    • Second harmonic generation was found to be sensitive to the physical state of the interface.

    Conclusions:

    • The study successfully characterized SHG of SV waves at solid interfaces.
    • Theoretical predictions for SHG amplitude are validated by experimental data.
    • Interface condition significantly impacts nonlinear acoustic wave generation, offering potential for non-destructive evaluation.