Material degradation detection by ultrasonic decay constant measurement
- Japan Power Engineering and Inspection Corp., Yokohama (Japan). JAPEIC Research Center
Structural materials used in a nuclear power plant may be degraded mainly by fatigue, neutron irradiation embrittlement or thermal embrittlement. in order to improve the availability and reliability of a nuclear power plant, it is especially advantageous to detect nondestructively the degradation as early as possible and to prevent possible failures. Measurement of change of ultrasonic decay constant has been proposed as promising degradation detection method. In this study, measurement of frequency dependence of decay constant of ultrasonic wave during propagation in materials is introduced. By exciting an EMAT (electromagnetic ultrasonic transducer) with sine burst wave and processing the ringing signals with a superheterodyne phase sensitive detector, decay constant is measured at the resonance frequency for platetype test specimen. Based on these results, it was confirmed that the relation between frequency and decay constant varied with the degree of material degradation and also with the amplitude of residual stress.
- OSTI ID:
- 131846
- Report Number(s):
- CONF-950740-; ISBN 0-7918-1334-7; TRN: 96:005109
- Resource Relation:
- Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 1995; Related Information: Is Part Of Service experience, structural integrity, severe accidents, and erosion in nuclear and fossil plants. PVP-Volume 303; Paterson, S.R.; Bamford, W.H; Geraets, L.H.; Okazaki, M.; Cipolla, R.C.; Cowfer, C.D.; Means, K.H. [eds.]; PB: 425 p.
- Country of Publication:
- United States
- Language:
- English
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