HEXAGONAL ARRAY STRUCTURE FOR 2D NDE APPLICATIONS

This paper describes a combination of simulation and experimentation to evaluate the advantages offered by utilizing a hexagonal shaped array element in a 2D NDE array structure. The active material is a 1-3 connectivity piezoelectric composite structure incorporating triangular shaped pillars--each...

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Bibliographic Details
Main Authors: Dziewierz, J., Ramadas, S. N., Gachagan, A., O'Leary, R. L.
Format: Conference Proceeding
Language:English
Subjects:
APERTURES
C CODES
CALCULATION METHODS
CERAMICS
COMPUTER CODES
COMPUTERIZED SIMULATION
COUPLING
ELECTRICITY
FINITE ELEMENT METHOD
FREQUENCY RANGE
M CODES
MATERIALS SCIENCE
MATERIALS TESTING
MATHEMATICAL SOLUTIONS
MHZ RANGE
MICROSTRUCTURE
NONDESTRUCTIVE TESTING
NUMERICAL SOLUTION
OPENINGS
P CODES
PIEZOELECTRICITY
SIMULATION
TESTING
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Description
Summary:This paper describes a combination of simulation and experimentation to evaluate the advantages offered by utilizing a hexagonal shaped array element in a 2D NDE array structure. The active material is a 1-3 connectivity piezoelectric composite structure incorporating triangular shaped pillars--each hexagonal array element comprising six triangular pillars. A combination of PZFlex, COMSOL and Matlab has been used to simulate the behavior of this device microstructure, for operation around 2.25 MHz, with unimodal behavior and low levels of mechanical cross-coupling predicted. Furthermore, the application of hexagonal array elements enables the array aperture to increase by approximately 30%, compared to a conventional orthogonal array matrix and hence will provide enhanced volumetric coverage and SNR. Prototype array configurations demonstrate good corroboration of the theoretically predicted mechanical cross-coupling between adjacent array elements (approx23 dB).
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3362496