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Lamb waves propagation in elastic plane layers with a joint strip
Mihai Valentin Predoi1, Martine Rousseau
1Department of Mechanics, University Politehnica Bucharest, Calea Plevnei 94, 010236-Bucharest, Romania. predoi@cat.mec.pub.ro
Ultrasonics
|June 14, 2005
Summary
Lamb waves enable ultrasonic weld characterization due to their long-range propagation. This study models weld strips, calculating reflected and transmitted waves using modal series and verifying accuracy with finite element simulations and energy balance.
Area of Science:
- Materials Science
- Acoustics
- Solid Mechanics
Background:
- Lamb waves are crucial for non-destructive testing and characterization of materials.
- Ultrasonic characterization of welds requires methods capable of long-range signal propagation.
- Simplified models are essential for understanding complex wave phenomena in materials.
Purpose of the Study:
- To investigate a simplified model of a weld strip between two semi-infinite elastic layers.
- To express reflected and transmitted ultrasonic fields using modal series.
- To verify the accuracy of the model through comparisons with finite element simulations and energy balance principles.
Main Methods:
- Development of a simplified analytical model for a weld strip.
- Application of orthogonality relations to obtain modal series coefficients.
- Comparison with finite element wave propagation simulations.
- Utilizing energy balance to validate modal amplitudes.
Main Results:
- The reflected and transmitted ultrasonic fields were successfully expressed by modal series.
- The model provided accurate predictions when compared to finite element simulations.
- Energy balance confirmed the accuracy of the calculated modal amplitudes.
Conclusions:
- The simplified model effectively describes ultrasonic wave propagation in weld strips.
- Modal series analysis is a viable method for characterizing welds using Lamb waves.
- The study validates the use of Lamb waves for accurate ultrasonic weld inspection.