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Ultrasonic guided interface waves at a soft-stiff boundary.
Jason H Bostron1, Joseph L Rose2, Clark A Moose3
1Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16802.
The Journal of the Acoustical Society of America
|February 12, 2015
Summary
This study characterizes interface waves at soft-stiff boundaries, revealing similarities to leaky Rayleigh waves. These findings offer a promising non-destructive evaluation method for material bonds.
Area of Science:
- Solid mechanics
- Wave propagation
- Materials science
Background:
- Interface waves at solid-solid boundaries are well-studied.
- Limited research exists on waves between soft, light, viscoelastic, and stiff solids.
Purpose of the Study:
- To describe the characteristics of interface waves propagating along soft-stiff boundaries.
- To explore their potential for non-destructive evaluation (NDE) of material bonds.
Main Methods:
- Analytical modeling
- Finite element modeling (FEM)
- Experimental validation using steel plates with viscoelastic coatings
Main Results:
- Interface waves exhibit properties similar to leaky Rayleigh-like waves on the stiff solid.
- Models and experiments show good agreement for wave velocity and displacement.
- Identified promising features for bond evaluation.
Conclusions:
- The study successfully models and characterizes interface waves at soft-stiff boundaries.
- These waves demonstrate potential as a non-destructive evaluation technique for assessing material bonds, particularly in coating applications.
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