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Proceedings Paper

Laser Doppler velocimetry and PZT sensing for the study of guided waves in a stepped aluminum plate
Author(s): L. Maio; F. Ricci; V. Memmolo; N. D. Boffa; E. Monaco; A. K. Mal; C. Schaal
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Paper Abstract

Lamb waves propagating in thin plates and shells are being widely studied for their potential applications in nondestructive inspection of large-scale structures. These structures are generally characterized by the presence of geometrical discontinuities such as stiffeners, mechanical joints or variable thicknesses that affect the propagation characteristics of Lamb waves that can be very similar to those from defects occurring in service (delamination, disbond, etc.). Therefore, the knowledge of the effects of such discontinuities on the propagation of guided waves is essential to avoid their false identification as defects. In this work Lamb waves propagating in a metal plate with a downward step are studied through laboratory experiments. A single 10 mm piezoceramic disk (PZT) bonded to the host structure using cyanoacrylate gage adhesive is utilized for Lamb waves generation and the responses are measured at multiple locations, along a line crossing the step, using a scanning laser Doppler vibrometer (LDV). The interaction of the fundamental Lamb mode A0 with the geometrical discontinuity in the isotropic plate is investigated and discussed.

Paper Details

Date Published: 5 April 2017
PDF: 15 pages
Proc. SPIE 10170, Health Monitoring of Structural and Biological Systems 2017, 101701S (5 April 2017); doi: 10.1117/12.2260140
Show Author Affiliations
L. Maio, Univ. degli Studi di Napoli Federico II (Italy)
F. Ricci, Univ. degli Studi di Napoli Federico II (Italy)
V. Memmolo, Univ. degli Studi di Napoli Federico II (Italy)
N. D. Boffa, Univ. degli Studi di Napoli Federico II (Italy)
E. Monaco, Univ. degli Studi di Napoli Federico II (Italy)
A. K. Mal, Univ. of California, Los Angeles (United States)
C. Schaal, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 10170:
Health Monitoring of Structural and Biological Systems 2017
Tribikram Kundu, Editor(s)

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