Search


Information
ICMST-Tohoku 2018
Oct. 23 - 26, 2018
Sendai, Japan
ICMST-Shenzhen 2016
Nov 1 - 4, 2016
Shenzhen, China
(EXIT THIS PAGE)
ICMST-Kobe 2014
Nov 2(Sun) - 5(Wed), 2014
Kobe, Japan
Nuclear Regulation Authority Outline of the New Safety Standards for Light Water Reactors for Electric Power Generation
For Public Comment
Outline of New Safety Standard (Design Basis)
For Public Comment
New Safety Standards (SA) Outline (Draft)
For Public Comment
Outline of New Safety Standard(Earthquake and Tsunami)(DRAFT)
Issues
 

Vol.10 No.2(Aug)
Vol.10 No.1(May)
Vol.9 No.4(Feb)
Vol.9 No.3(Nov)
< Other Issues

 

Occasional Topics
OTjapan Measures for Tsunami Striking Nuclear Power Station in Japan
Special Article: The Great Tohoku Earthquake (1)
OTjapan The Tragedy of “To Be” Principle in the Japanese Nuclear Industry
EJAMOT_CN3_Figure1_The_outside_view_of_CEFR OTChinaPlanning and Consideration on SFR R&D Activities in China
< All Occasional Topics

Featured Articles
EJAM7-3NT72 A New Mechanical Condition-based Maintenance Technology Using Instrumented Indentation Technique
EJAM7-3NT73 Survey robots for Fukushima Daiichi Nuclear Power Plant

JSM
Contacts
(EJAM): ejam@jsm.or.jp
(JSM): secretariat@jsm.or.jp
HP: http://www.jsm.or.jp
(in English)

 

Vol.11 No.4previousAA SP22 (AA165-166-167-168-169-170-171) NT96

Academic Articles
Regular Paper Vol. 11 No. 4 (2020) p.139 - p.146
 

Corrosion Induced Roughness Characterization by Ultrasonic Attenuation Measurement

 

Hiroyuki NAKAMOTO1,3,*, Philippe GUY2 and Toshiyuki TAKAGI3,4

 
1 Graduate School of System Informatics, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
2 Laboratoire Vibrations Acoustique, INSA-Lyon, 25 bis, av. J. Capelle F-69621 Villeurbanne Cedex, Lyon, France
3 Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
4 ELyTMaX UMI 3757, CNRS – Université de Lyon – Tohoku University, International Joint Unit, Université de Lyon, Lyon, France
 
Abstract
Corrosion and erosion lead to partial wear inside pipes. This wear induces some roughness of the inner pipe wall and decreases its thickness. This could cause a fatal accident in nuclear and thermal power plants. In general, nondestructive inspection by ultrasonic devices measures only the thickness, not the roughness. When reflected on a rough surface ultrasonic waves scatter and attenuate. Then this study aims to estimate the surface roughness of the pipe wall from ultrasonic attenuation estimation, based on the analysis of the acquired waveforms on several specimens that have been machined in order to simulated a corroded rough surface. The experimental data exhibit a clear relationship between the roughness and the ultrasonic attenuation, in good agreement with theoretical models available in the literature, for both bulk longitudinal and shear waves.
 
Keywords
Nondestructive testing, corrosion, surface roughness, wave attenuation, longitudinal and shear-horizontal wave
 
Full Paper: PDF
Article Information
Article history:
Received 28 November 2018
Accepted 03 February 2020