Title

Design Of Interdigital Transducers For Crack Detection In Plates

Keywords

Crack geometry; Interdigital transducer; Lamb wave; Mobile double-sided; NDE strategy

Abstract

Interdigital transducers (IDT) for non-destructive evaluation (NDE) of cracks in plates are designed based on an analytical model established previously. Key considerations include mode selectivity, excitation strength, collimation of wave and cost. The advantage of mode selectivity of IDT over PZT patch is presented both analytically and experimentally. Effects of parameters, namely finger spacing, width, length, number of fingers, and the size of IDT, on the excitation strength and mode selectivity are considered. This led to the design of a mobile double-sided IDT as an efficient device where excitation strength is strong and focused. The device was fabricated in-house using commercially available piezoelectric ceramics and used to develop a procedure for accurate identification of the direction and extent of cracks in plates. Three aluminum plates, one with a linear deep crack, another with a piecewise linear shallower crack and the third with a curved crack, were used to illustrate the accuracy and efficiency of both the proposed device and procedure for effective NDE. © 2004 Elsevier B.V. All rights reserved.

Publication Date

5-1-2005

Publication Title

Ultrasonics

Volume

43

Issue

6

Number of Pages

481-493

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/j.ultras.2004.09.005

Socpus ID

16244408916 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/16244408916

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