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Open AccessArticle

Determination of Plate Corrosion Dimension Using Nd:YAG Pulsed Laser-generated Wavefield and Experimental Dispersion Curves

1
School of Civil, Architectural Engineering and Landscape Architecture, Sungkyunkwan University, Suwon 16419, Korea
2
Department of Convergence Engineering for Future City, Sungkyunkwan University, Suwon 16419, Korea
*
Author to whom correspondence should be addressed.
Current address: Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Korea.
Materials 2020, 13(6), 1436; https://doi.org/10.3390/ma13061436
Received: 14 February 2020 / Revised: 15 March 2020 / Accepted: 16 March 2020 / Published: 21 March 2020
(This article belongs to the Special Issue Corrosion and Protection of Materials)
Corrosion detection using a pulsed laser scanning system can be performed via ultrasonic wave propagation imaging. This method outputs illustrations of the wave field within the host structure; thus, it can depict wave–corrosion area interactions. Additionally, post-processing can be performed to enhance the visualization of corroded areas. The wavefield energy computed using RMS (Root Mean Square) is a validated post-processing tool capable of displaying the location and area of corrosion-damaged regions. Nonetheless, to characterize corrosion, it is necessary to determine its depth. The measurement of depth in conjunction with that of the corroded area via the RMS distribution enables the determination of all dimensions of corrosion damage. Thereafter, the flaw severity can be evaluated. This study employed a wavefield within a plate on which corrosion was developed artificially to generate frequency–wavenumber dispersion curves. The curves were compared with their counterparts from a corrosion-free plate. Alternatively, they could be compared with dispersion curves drawn using the depth and material properties of a pristine plate via a computer program. Frequency–wavenumber pairs were extracted from the dispersion curves produced using the portion of the wavefield within the corroded area. These were inserted into the Rayleigh–Lamb equation, from which depths were calculated and averaged. View Full-Text
Keywords: corrosion damage; ultrasonic wave propagation imaging; root mean square; dispersion curves; Rayleigh–Lamb equation; Fourier transform corrosion damage; ultrasonic wave propagation imaging; root mean square; dispersion curves; Rayleigh–Lamb equation; Fourier transform
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MDPI and ACS Style

Tola, K.D.; Quoc Tran, D.; Yu, B.; Park, S. Determination of Plate Corrosion Dimension Using Nd:YAG Pulsed Laser-generated Wavefield and Experimental Dispersion Curves. Materials 2020, 13, 1436.

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