| Summary: | 碩士 === 長庚大學 === 機械工程研究所 === 95 === The characterization of hydrogen concentration (HC) in Zircaloy cladding tubes is an important task. At the same HC, material property (strength and ductility) grown worse quickly with radial hydride than circumferential hydride. So that the important task is not only HC but also RH. Guided waves (GW) propagating in tubes have been extensively used to characterize properties of tubes. In previous study, Axially propagating guided waves (AGW) has been reported to characterize HC in Zircaloys. So, This study is focused on circumferentially propagating guided waves (CGW) to inspect direction of hydride. In this study, a NDE technique employing the LUT and a simplex inversion process is reported for the characterization of radial and circumferential hydride. It’s shown that Young’s modulus of radial hydride be higher than circumferential hydride with CGW, but unchanged with AGW.
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