S21  Vibrações e Análise Modal
 
 Title:
EXCITATION, PROPAGATION, AND DETECTION OF STRUCTURAL WAVES IN PIEZOELECTRIC COMPOSITE BEAMS
 
Summary :
A MODEL BASED ON REDDY S DISCRETE LAYERWISE LAMINATE THEORY IS EMPLOYED TO SIMULATE THE HIGH-FREQUENCY (SHORT-WAVELENGTH) EXCITATION, PROPAGATION, AND SENSING, OF STRUCTURAL WAVES IN COMPOSITES CONTAINING PIEZOELECTRIC SENSORS AND ACTUATORS. COMPARISONS BETWEEN APPROXIMATE AND EXACT WAVE DISPERSION SPECTRA ARE PERFORMED IN ORDER TO ASSESS THE EFFICIENCY OF THE LAYERWISE THEORY IN THE HIGH-FREQUENCY RANGE. A STUDY OF THE PROPAGATION OF GUIDED WAVES IN AN 11-PLY ARALL BEAM WITH BONDED PZT LAYERS IS REPORTED. IT IS SHOWN THAT, BY EMPLOYING THE APPROPRIATE INTERPOLATION SCHEME, THE APPROXIMATE MODEL IS CAPABLE OF REPRODUCING THE EXACT DISPERSION SPECTRUM AT WAVELENGTH TO THICKNESS RATIOS AS LOW AS 0.25. FINALLY, RESULTS FROM SIMULATIONS OF THE BROAD-BAND, FREQUENCY RESPONSE OF AN ACTIVE ALUMINUM BEAM WITH SIMULATED SURFACE BREAKING DEFECTS OF DIFFERENT DEPTHS ARE PRESENTED AND COMPARED WITH DATA FROM SIMILAR EXPERIMENTS. 
 
Author :
Braga, Arthur M. B.
Gama, Antonio Lopes
Morikawa, Sergio R. K.
 
 
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