ELECTRO-MECHANICAL IMPEDANCE BASED SHM OF THICK STRUCTURES IN BROAD-BAND FREQUENCY SPECTRUM

Authors : Mesut TEKKALMAZ

Pages : 256-268

Doi:10.18038/estubtda.743369

View : 13 | Download : 12

Publication Date : 2020-06-15

Article Type : Research Paper

Abstract :In this study, theoretical and experimental studies were conducted in terms of electro-mechanical impedance spectroscopy insert ignore into journalissuearticles values(EMIS); to monitor the structural health status of thick metallic bar structures in broad-band frequency in the range up to 15 MHz. Thus, in-plane insert ignore into journalissuearticles values(longitudinal-wise); and out-of-plane insert ignore into journalissuearticles values(thickness-wise); mode EMI spectra were included in this range of frequency. Then, the thickness mode EMIS peaks were focused for pristine thick steel bar as a baseline and for bars with simulated damage in different depths and different locations. For theoretical part of the study, coupled field finite element analyses insert ignore into journalissuearticles values(CF-FEA); were carried out by modeling piezoelectric wafer active sensor insert ignore into journalissuearticles values(PWAS); bonded on steel bars in pristine and in damaged status. The thickness mode EMIS results from both CF-FEA simulations and EMIS measurements were analyzed to investigate the effects of the damage location and size variations through a statistical pattern recognition method as damage index such as the root mean square deviation, RMSD, method. It was found that RMSD values were similar trend for experimental and CF-FEA.
Keywords : Structural Health Monitoring SHM, Electro mechanical Impedance EMI,