Durability Assessment of Bonded Piezoelectric Wafer Active Sensors for Aircraft Health Monitoring Applications

This study conducted experimental and numerical investigations on piezoelectric wafer active sensors (PWASs) bonded to an aluminum plate to assess the impact of bonding degradation on Lamb wave generation. Three surface-bonded PWASs were examined, including one intentionally bonded with a reduced ad...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2024-01, Vol.24 (2), p.450
Main Authors: Eiras, Jesús N, Gavérina, Ludovic, Roche, Jean-Michel
Format: Article
Language:English
Subjects:
Adhesives
Aeronautics
Aging
Aircraft
Aluminum
Bond strength
Boundary conditions
Energy consumption
Engineering Sciences
guided waves
Humidity
Nondestructive testing
Numerical analysis
Physics
piezoelectric wafer active sensor
Plates, Aluminum
Preventive maintenance
Radiation
Sensors
structural health monitoring
Temperature
Thermal cycling
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Summary:This study conducted experimental and numerical investigations on piezoelectric wafer active sensors (PWASs) bonded to an aluminum plate to assess the impact of bonding degradation on Lamb wave generation. Three surface-bonded PWASs were examined, including one intentionally bonded with a reduced adhesive to create a defective bond. Thermal cyclic aging was applied, monitoring through laser Doppler vibrometry (LDV) and static capacitance measurements. The PWAS with the initially defective bond exhibited the poorest performance over aging cycles, emphasizing the significance of the initial bond condition. As debonding progressed, modifications in electromechanical behavior were observed, leading to a reduction in wave amplitude and distortion of the generated wave field, challenging the validity of existing analytical modeling of wave-tuning curves for perfectly bonded PWASs. Both numerical simulations and experimental observations substantiated this finding. In conclusion, this study highlights the imperative of a high-integrity bond for the proper functioning of a guided wave-based structural health monitoring (SHM) system, emphasizing ongoing challenges in assessing SHM performance.
ISSN:1424-8220
1424-8220
DOI:10.3390/s24020450