Long-Term Durability and Integrity of Built-In Piezoelectric-Based Active Sensing Network in Structures
Final rept. 1 Apr 2004-31 Mar 2007
STANFORD UNIV CA
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Piezoelectric actuators PZT are widely used for Structural Health Monitoring Systems SHM and are mostly surface mounted or embedded into a structure with a polymer adhesive layer. The long-term durability and integrity of piezoelectric-based active sensing networks surface-mounted on metallic structures is studied. Numerical and experimental investigations based on nanotechnologies were conducted to characterize and improve the durability, performance and integrity of structures with integrated piezoelectric materials. A Spectral Element based code SEM equipped with a coupled electro-mechanical field solver has been developed to simulate ultrasonic Lamb wave propagation in 3-D structures with built-in piezoelectric sensors. An experimental investigation showed that the integrity of the PZTstructure interlace is critical for the performance of PZT actuators. Hie electro-mechanical coupling between PZT actuators and a hosting aluminium plate was found to vary with the interface debonding. The design of a carbon nanolube coated piezoelectric actuator C-PZT is presented.
- Electricity and Magnetism