Paper Title:
Application of Laser-Generated Ultrasound for Evaluation of Thickness Reduction in Carbon Steel Pipes
  Abstract

In carbon steel pipes of nuclear power plants, local wall thinning may result from erosion-corrosion or flow-accelerated corrosion(FAC) damage. Local wall thinning is one of the major causes for the structural fracture of these pipes. Therefore, assessment of local wall thinning due to corrosion is an important issue in nondestructive evaluation for the integrity of nuclear power plants. In this study, laser-generated ultrasound technique was employed to evaluate local wall thinning due to corrosion. Guided waves were generated in the thermoelastic regime using a Q-switched pulsed Nd:YAG laser with a linear slit array. . In this paper, time-frequency analysis of ultrasonic waveforms using wavelet transform allowed the identification of generated guided wave modes by comparison with the theoretical dispersion curves. Modes conversion and group velocity were employed to detect thickness reduction.

  Info
Periodical
Key Engineering Materials (Volumes 321-323)
Edited by
Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi
Pages
743-746
DOI
10.4028/www.scientific.net/KEM.321-323.743
Citation
J. H. Park, J. H. Lee, G. C. Seo, S. W. Choi, "Application of Laser-Generated Ultrasound for Evaluation of Thickness Reduction in Carbon Steel Pipes", Key Engineering Materials, Vols. 321-323, pp. 743-746, 2006
Online since
October 2006
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Price
$32.00
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