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Proceedings Paper

A fundamental study of an inspection method for thin-walled structures using lamb waves induced by chirp signals
Author(s): Yoshihiro Mizutani; Satoshi Inokawa
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Paper Abstract

In this study, a new NDT-method is proposed for inspecting delaminations in the composite plates (1mm-thickness CFRP layer with 1mm-thickness aluminum liner) Lamb waves (plate waves) generated by chirp signals (250-1000 kHz, 4Vp-p) were used for the inspection. We first studied characteristics of excited signals from the pulser when the chirp signal is used as an input signals. The amplitude of the excited signal from the pulser is changed with frequency due to the resonant characteristics of the transducer, although, wide range of the frequency components can be generated by using chirp signals. Two transducers were mounted on the composite plate, and inspection was conducted by using lamb waves. The amplitude, velocity and scattering of lamb waves on damaged and sound zone were compared. When the transducer is on the delamination area, low frequency components of the lamb wave drastically attenuated and could easily detect the delaminations. While, when the delamination is between two transducers, characteristics of lamb waves are similar to those on the sound area and difficult to separate each other with reasonable accuracy. Further modification of experimental method is needed to accomplish new inspection method.

Paper Details

Date Published: 12 April 2005
PDF: 8 pages
Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); doi: 10.1117/12.621558
Show Author Affiliations
Yoshihiro Mizutani, Tokyo Institute of Technology (Japan)
Satoshi Inokawa, Tokyo Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 5852:
Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics
Chenggen Quan; Fook Siong Chau; Anand Asundi; Brian Stephen Wong; Chwee Teck Lim, Editor(s)

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