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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Analysis of the transient surface wave propagation in soft-solid elastic plates
Nicolás Benech1, Javier Brum1, Gustavo Grinspan1
1Laboratorio de Acústica Ultrasonora, Instituto de Física, Facultad de Ciencias, Igua 4225, 11400, Montevideo, Uruguay.
The Journal of the Acoustical Society of America
|December 3, 2017
Summary
This study analyzes transient surface waves in soft-solid elastic plates, revealing a critical distance for Rayleigh-Lamb mode formation. A new model based on surface wave interference accurately describes experimental data in the near-field.
Area of Science:
- * Physics of soft materials
- * Acoustic wave propagation
- * Elastography and biomechanics
Background:
- * Dynamic elastography estimates tissue stiffness using audio-frequency waves.
- * Shear wavelengths are centimeter-sized, requiring near-field measurements.
- * Near-field effects of surface and guided waves are less understood than bulk waves.
Purpose of the Study:
- * Analyze transient surface displacement fields in soft-solid elastic plates.
- * Investigate mode conversion characteristics due to high Poisson's ratio.
- * Develop a model for near-field surface wave behavior and shear wave velocity retrieval.
Main Methods:
- * Theoretical analysis of transient surface displacement fields.
- * Investigation of wave reflections and mode conversion.
- * Development and validation of a surface wave interference model.
Main Results:
- * Identified a critical distance for Rayleigh-Lamb mode formation.
- * Demonstrated that below this distance, direct surface waves dominate, altering dispersion curves.
- * Proposed a surface wave interference model that matches experimental data.
Conclusions:
- * Near-field transient surface wave behavior in soft-solids differs from standard Rayleigh-Lamb theory.
- * A critical distance is necessary for the establishment of Rayleigh-Lamb modes.
- * The proposed interference model provides accurate predictions and conditions for shear wave velocity retrieval.
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