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Surface Roughness Effects on Self-Interacting and Mutually Interacting Rayleigh Waves.

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Surface roughness significantly increases nonlinear effects in Rayleigh waves, complicating their use in material degradation assessment. Understanding this interaction is crucial for accurate ultrasonic nondestructive evaluation.

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Area of Science:

  • Materials Science
  • Acoustics
  • Nondestructive Evaluation

Background:

  • Nonlinear Rayleigh waves offer high sensitivity to early material degradation.
  • Material nonlinearity distorts waveforms, enabling detection of subtle changes.
  • The impact of surface roughness on nonlinear Rayleigh wave propagation remains uninvestigated.

Purpose of the Study:

  • To investigate the effect of surface roughness on the nonlinear behavior of Rayleigh waves.
  • To determine how varying surface roughness influences the relative nonlinearity parameter.

Main Methods:

  • Rayleigh waves were propagated along aluminum surfaces with controlled, varying roughness.
  • The relative nonlinearity parameter was measured for different average asperity heights (0.027-3.992 μm) and Rayleigh wavelengths (0.29-1.9 mm).

Main Results:

  • The relative nonlinearity parameter significantly increased with increasing surface roughness.
  • Contrary to expectations, increased attenuation due to roughness did not decrease the nonlinearity parameter; it increased.
  • Attenuation-based corrections for nonlinearity proved unsuccessful.

Conclusions:

  • Surface roughness significantly enhances the measured nonlinearity of Rayleigh waves.
  • Accurate material nonlinearity measurements require either consistent surface roughness or a quantitative model for roughness effects.
  • Further research is needed to decouple the effects of material nonlinearity and surface roughness on wave distortion.