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Mode conversion of SH guided waves with symmetry inversion in plates
Alan C Kubrusly1, Pedro Tovar1, Jean Pierre von der Weid1
1Centre for Telecommunication Studies, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil.
Ultrasonics
|January 1, 2021
Summary
This study introduces a novel "symmetry inverter discontinuity" for shear horizontal (SH) ultrasonic guided waves. This discontinuity efficiently converts wave modes, offering new possibilities for non-destructive testing and material characterization.
Area of Science:
- Materials Science
- Acoustics
- Non-Destructive Testing
Background:
- Ultrasonic guided waves, specifically shear horizontal (SH) waves, are used for non-destructive testing.
- Mode conversion occurs when SH waves encounter thickness discontinuities in plates.
- Symmetric discontinuities typically preserve wave symmetry, limiting mode conversion.
Purpose of the Study:
- To investigate mode conversion in plates with various discontinuities using analytical and numerical methods.
- To identify and characterize a novel
- To experimentally verify the phenomenon of symmetry inversion for SH waves.
Main Methods:
- Analytical modeling based on the reciprocity principle.
- Finite element analysis (FEA) for simulating wave propagation and interaction.
- Experimental verification using acrylic plates with controlled discontinuities.
Main Results:
- A novel discontinuity type, termed
- The effectiveness of this symmetry inverter discontinuity is frequency-dependent.
- Experimental validation confirmed the predicted symmetry inversion of SH waves.
Conclusions:
- Symmetry inverter discontinuities offer a unique mechanism for SH wave mode conversion.
- This finding has implications for advanced non-destructive evaluation techniques.
- The frequency dependence highlights the importance of signal processing in such applications.
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