An Experimental Study on Lamb Wave Leakage from a Plate into Adjacent Fluids Using Low-Cost Sensors

Author

University of Gonabad

10.22044/jsfm.2026.17220.4030

Abstract

Thin plates are widely used in industrial structures and mechanical components, where Lamb waves are generated either by external mechanical excitations or internal defects such as cracking. When a plate is in contact with a surrounding fluid, part of the wave energy leaks into the adjacent medium, thereby altering the propagation characteristics within the plate. In this study, the leakage of Lamb waves from a metallic plate into a neighboring fluid is investigated experimentally. For this purpose, a simple laboratory setup was developed, and a database of low–sampling-rate acoustic emission (AE) signals was collected. The acquired data were analyzed in both the time and frequency domains to evaluate the influence of the fluid on the wave propagation behavior. The results indicate that although time-domain features are strongly affected by the leakage phenomenon, they do not provide sufficient discrimination capability at low sampling rates. Experimental findings show that immersing the plate in water leads to approximately 98% energy leakage into the fluid. These observations suggest that low-cost sensors can serve as an effective tool for monitoring and analyzing Lamb-wave propagation in thin plates under fluid-contact conditions.

Keywords

Main Subjects

Journal of Solid and Fluid Mechanics
Volume 16, Issue 2
July and August 2026
Pages 143-156

Files

Share

How to cite

Statistics