Recent Advances in Piezoelectric Wafer Active Sensors for Structural Health Monitoring Applications
Journal Article - Open Access
University of South Carolina Columbia United States
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In this paper, some recent piezoelectric wafer active sensors PWAS progress achieved in our laboratory for active materials and smart structures LAMSS at the University of South Carolina http www.me.sc.eduresearchlamss group is presented. First, the characterization of the PWAS materials shows that no significant change in the microstructure after exposure to high temperature and nuclear radiation, and the PWAS transducer can be used in harsh environments for structural health monitoring SHM applications. Next, PWAS active sensing of various damage types in aluminum and composite structures are explored. PWAS transducers can successfully detect the simulated crack and corrosion damage in aluminum plates through the wavefield analysis, and the simulated delamination damage in composite plates through the damage imaging method. Finally, the novel use of PWAS transducers as acoustic emission AE sensors for in situ AE detection duringfatigue crack growth is presented. The time of arrival of AE signals at multiple PWAS transducers confirms that the AE signals are originating from the crack, and that the amplitude decay due to geometric spreading is observed.
- Test Facilities, Equipment and Methods