Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/40797
Title: Guided-wave-based detections of weld and crack in steel plates
Authors: Lu, MY
Lu, X
Zhou, LM 
Su, Z 
Ye, L
Keywords: Continuous wavelet transforms
Damage detection
Epoxies
Ferroelectric materials
Pattern recognition
Signal processing
Simulations
Structural health monitoring
Water
Wavelet transforms
Issue Date: 2009
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2009, v. 7493, 74932S How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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.
Description: Second International Conference on Smart Materials and Nanotechnology in Engineering, Weihai, China, 8-11, July 2009
URI: http://hdl.handle.net/10397/40797
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.845656
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