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Proceedings Paper

Application of a baseline-free damage detection technique to complex structures
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Paper Abstract

Recently, a reference-free damage detection technique that does not rely on baseline data has been proposed for plate-like structures by the author's research group. If Lamb waves traveling along a thin plate encounter damage such as crack and corrosion, mode conversions occur. Using the previously developed reference-free technique, it has been shown that the mode conversion due to damage formation can be detected without using baseline data. In this study, the previous technique is further advanced so that it can be applied to structures with complex geometries such as a stiffener and thickness variations. First, the applicability of the proposed technique to a plate with a stiffener is tested. Due to the stiffener in the wave path, mode conversion is produced even in the absence of damage. Next, the effect of the plate thickness variation is investigated. When Lamb waves propagate along a symmetrically tapered section, mode conversion can be also produced. However, due to symmetry of waveguide, converted modes cancel out each other and no special treatment is necessary. On the other hand, non-symmetric thickness variation can cause the mode conversion even in the absence of the defect. Since feature observed from the non-symmetrically tapered plate is the most complex to analyze, this case is highlighted in this study. Furthermore, an instantaneous damage classification method has been developed. Experimental studies as well as numerical simulations are executed to investigate the effectiveness of the proposed technique.

Paper Details

Date Published: 30 March 2009
PDF: 10 pages
Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 729221 (30 March 2009); doi: 10.1117/12.815703
Show Author Affiliations
Changgil Lee, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Seungbum Kim, Carnegie Mellon Univ. (United States)
Hoon Sohn, Korea Advanced Institute of Science and Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 7292:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009
Masayoshi Tomizuka, Editor(s)

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