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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Remote ultrasonic excitation of surface waves enhances structural nondestructive evaluation. Varying the spatial decay rate of bounded inhomogeneous waves optimizes surface wave excitation efficiency for standoff testing.

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Area of Science:

  • Materials Science
  • Acoustics
  • Solid Mechanics

Background:

  • Surface wave excitation typically requires contact transducers.
  • Remote excitation is crucial for standoff testing in nondestructive evaluation (NDE).
  • Bounded inhomogeneous waves offer improved surface wave excitation efficiency over other wave profiles.

Purpose of the Study:

  • Investigate the impact of varying incident wave spatial decay rates.
  • Analyze effects on lossless fluid-solid interfaces and viscoelastic solids.
  • Optimize surface wave excitation for remote NDE applications.

Main Methods:

  • Utilized the Fourier method to decompose incident wave profiles.
  • Computed reflected wave profiles based on decomposed incident waves.
  • Applied inhomogeneous plane wave theory for analysis.

Main Results:

  • Inhomogeneous plane wave theory accurately predicts reflection coefficient minima concerning decay rate.
  • Plane wave theory provides a good estimate for maximizing surface wave excitation.
  • Demonstrated the influence of spatial decay rate on wave reflection and excitation.

Conclusions:

  • The spatial decay rate of bounded inhomogeneous waves is a critical parameter for efficient remote surface wave excitation.
  • Theoretical predictions align well with numerical results, validating the approach.
  • Findings support the development of advanced remote NDE techniques.