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Analysis of Dispersion Characteristics of Circumferential Guided Waves and Application to feeder Cracking in Pressurized Heavy Water Reactor  

Cheong, Yong-Moo (Nuclear Materials Technology Division, Korea Atomic Energy Research Institute)
Kim, Sang-Soo (Nuclear Materials Technology Division, Korea Atomic Energy Research Institute)
Lee, Dong-Hoon (Nuclear Materials Technology Division, Korea Atomic Energy Research Institute)
Jung, Hyun-Kyu (Nuclear Materials Technology Division, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.24, no.4, 2004 , pp. 307-314 More about this Journal
Abstract
A circumferential guided wave method was developed to detect the axial crack on the bent feeder pipe. Dispersion curves of circumferential guided waves were calculated as a function of curvature of the pipe. In the case of thin plate, i.e. infinite curvature, as the frequency increases, the $S_0$ and $A_0$ mode coincide and eventually become Rayleigh wave mode. In the case of pipe, however, as the curvature increases, the lowest modes do not coincide even in the high frequencies. Based on the analysis, a rocking technique using angle beam transducer was applied to detect an axial defect in the bent region of PHWR feeder pipe. Based on the analysis of experimenal data for artificial notches, the vibration modes of each signal were identified. It was found that the notches with the depth of )0% of wall thickness can be detected with the method.
Keywords
circumferential guided waves; dispersion curves crack detection; pipe inspection;
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