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Proceedings Paper

Guided-wave-based detections of weld and crack in steel plates
Author(s): Mingyu Lu; Xi Lu; Limin Zhou; Zhongqing Su; Lin Ye
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Paper Abstract

The guided-wave-based damage detection techniques using structurally integrated Lead-zirconate-titanate (PZT) patches for structural health monitoring (SHM) have been developed for many years. However, the method is still in its formative years and one of the main challenges is the application in real-word complicated structures. It's very important to widely study the techniques in the structures with simple geometries which can be used to construct more complicated structures for practical applications. In this paper, different steel plates of the same dimensions were used for detecting a 2mm-gap through-crack in welded zone and studying the effects of different impurities such as water, alcohol, epoxy and mud in the crack on wave propagations. Advanced signal processing and pattern recognition techniques such as the wavelet transform (WT) especially continuous wavelet transform (CWT) and Hilbert transform (HT) were used to enhance the efficiency of damage detections in the steel plates. Some simulation results were obtained to validate of experimental results. The results from both the experiments and simulations show the validity of the proposed method and the effects of different factors on the damage detection of the steel plates.

Paper Details

Date Published: 20 October 2009
PDF: 8 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74932S (20 October 2009); doi: 10.1117/12.845656
Show Author Affiliations
Mingyu Lu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Xi Lu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Limin Zhou, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Zhongqing Su, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Lin Ye, The Hong Kong Polytechnic Univ. (Hong Kong, China)
The Univ. of Sydney (Australia)


Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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