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Kim, Jae Hong
Research Group for Concrete Structures and Materials
Research Interests
  • Mechanics of Concrete, Rheology, Structural Analysis, Construction Performance

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Lamb wave line sensing for crack detection in a welded stiffener

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Title
Lamb wave line sensing for crack detection in a welded stiffener
Author
An, Yun-KyuKim, Jae HongYim, Hong Jae
Keywords
Frequency-wavenumber analysis; Lamb wave crack detection; Line sensing; Nondestructive testing; Structural health monitoring; Welded stiffener
Issue Date
201407
Publisher
MDPI AG
Citation
SENSORS, v.14, no.7, pp.12871 - 12884
Abstract
This paper proposes a novel Lamb wave line sensing technique for crack detection in a welded stiffener. The proposed technique overcomes one of the biggest technical challenges of Lamb wave crack detection for real structure applications: crack-induced Lamb waves are often mixed with multiple reflections from complex waveguides. In particular, crack detection in a welded joint, one of the structural hot spots due to stress concentration, is accompanied by reflections from the welded joint as well as a crack. Extracting and highlighting crack-induced Lamb wave modes from Lamb wave responses measured at multi-spatial points along a single line can be accomplished through a frequency-wavenumber domain analysis. The advantages of the proposed technique enable us not only to enhance the crack detectability in the welded joint but also to minimize false alarms caused by environmental and operational variations by avoiding the direct comparison with the baseline data previously accumulated from the pristine condition of a target structure. The proposed technique is experimentally and numerically validated in vertically stiffened metallic structures, revealing that it successfully identifies and localizes subsurface cracks, regardless of the coexistence with the vertical stiffener.
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DOI
http://dx.doi.org/10.3390/s140712871
ISSN
1424-8220
Appears in Collections:
UEE_Journal Papers
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