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Proceedings Paper

Delamination detection in a composite plate using a dual piezoelectric transducer network
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Paper Abstract

In this study, a new damage detection technique is developed so that delamination in a multilayer composite plate can be detected by comparing multi-path pitch-catch Lamb wave signals in a piezoelectric transducer network rather than by comparing each signal with its corresponding baseline signal obtained from the pristine condition. The development of the proposed technique is based on the premise that the fundamental anti-symmetric mode (A0) slows down when it passes through a delamination area while the speed of the fundamental symmetric mode (S0) is invariant. First, the delay of the A0 mode in each path is used as a delamination sensitive feature and extracted using a proposed mode extraction technique. This mode extraction technique uses dual piezoelectric transducers composed of a concentric ring and circular piezoelectric transducers, and it is capable of isolating the A0 mode in any desired frequency without frequency or transducer size tuning. Once the time delays of the A0 mode are computed for all pitch-catch paths in the transducer network, an instantaneous outlier analysis is performed on these features to identify wave propagation path(s) affected by the delaminated region(s). Because the time delays of the A0 mode are instantaneously computed from existing multiple paths, it has been demonstrated that robust delamination detection can be achieved even under varying temperature conditions.

Paper Details

Date Published: 31 March 2011
PDF: 13 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798406 (31 March 2011); doi: 10.1117/12.880942
Show Author Affiliations
Chul Min Yeum, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Hoon Sohn, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Jeong Beom Ihn, The Boeing Co. (United States)


Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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