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http://dx.doi.org/10.7779/JKSNT.2012.32.4.355

Nonlinear Time Reversal Focusing and Detection of Fatigue Crack  

Jeong, Hyun-Jo (Division of Mechanical and Automotive Engineering, Wonkwang University)
Barnard, Dan (Center for Nondestructive Evaluation)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.32, no.4, 2012 , pp. 355-361 More about this Journal
Abstract
This paper presents an experimental study on the detection and location of nonlinear scattering source due to the presence of fatigue crack in a laboratory specimen. The proposed technique is based on a combination of nonlinear elastic wave spectroscopy(NEWS) and time reversal(TR) focusing approach. In order to focus on the nonlinear scattering position due to the fatigue crack, we employed only one transmitting transducer and one receiving transducer, taking advantage of long duration of reception signal that includes multiple linear scattering such as mode conversion and boundary reflections. NEWS technique was then used as a pre-treatment of TR for spatial focusing of reemitted second harmonic signal. The robustness of this approach was demonstrated on a cracked specimen and the nonlinear TR focusing behavior is observed on the crack interface from which the second harmonic signal was originated.
Keywords
Fatigue Crack; Nonlinear Scatterer; Nonlinear Elastic Wave Spectroscopy(NEWS); Time Reversal(TR); Harmonic Generation; Crack Localization;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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