A baseline-free crack detection using nonlinear acoustics

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A crack detection technique based on nonlinear acoustic is developed in this study. Lead Zinconate Titanate (PZT) materials are used for exciting and sensing acoustic waves. Acoustic waves at a chosen frequency are generated using an actuating PZT transducer and they travel through the target structure before being received by a sensing PZT wafer. Unlike all undamaged medium, a cracked medium exhibits acoustic nonlinearity which is manifested as harmonics and fractional subharmonics in the power spectrum of the sensed signal. Experimental results also show that the harmonic and sub-harmonic components increase in magnitude with increasing amplitude of the input signal. The proposed technique tells the presence of cracks by looking at the aforementioned two features and obviates the need for baseline data.
Publisher
KOREAN SOC STEEL CONSTRUCTION-KSSC
Issue Date
2007-03
Language
English
Article Type
Article; Proceedings Paper
Citation

INTERNATIONAL JOURNAL OF STEEL STRUCTURES, v.7, no.1, pp.27 - 31

ISSN
1598-2351
URI
http://hdl.handle.net/10203/19254
Appears in Collection
CE-Journal Papers(저널논문)
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