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Experimental study and signal analysis in the Lamb wave conversion at a bevelled edge
N Wilkie-Chancellier1, H Duflo, A Tinel
1Laboratoire d'Acoustique Ultrasonore et d'Electronique, LAUE-CNRS (UMR 6068), Université du Havre, Place Robert Schuman, BP 4006, 76610 Le Havre, France. wilkie@iut.univ-lehavre.fr
Ultrasonics
|March 30, 2004
Summary
This study quantifies Lamb wave conversion at a plate
Area of Science:
- Solid mechanics
- Acoustics
- Wave propagation
Background:
- Lamb waves are crucial for nondestructive testing.
- Understanding wave interaction with boundaries is essential for accurate analysis.
- Bevelled edges can significantly alter wave behavior.
Purpose of the Study:
- To quantitatively study Lamb wave energy conversion at a bevelled plate edge.
- To analyze the influence of bevel angle on mode conversion.
- To evaluate energy distribution among converted Lamb wave modes.
Main Methods:
- Generation of harmonic Lamb waves (A1 and S0 modes) using a wedge.
- Measurement of normal surface displacements with a laser vibrometer.
- Signal isolation via Fourier transform for amplitude evaluation.
- Computation of energy flow repartition among converted modes.
Main Results:
- Quantified energy conversion efficiency for different bevel angles.
- Identified energy distribution among A1 and S0 modes after reflection.
- Demonstrated dependence of conversion on bevel angle.
Conclusions:
- Bevelled edges cause significant Lamb wave mode conversion.
- Energy repartition is controllable by adjusting the bevel angle.
- Provides quantitative data for ultrasonic testing and structural health monitoring.