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Paper Abstract and Keywords
Presentation 2010-04-22 13:45
Imaging of Closed Cracks Using Subharmonic Phased Array
Yoshikazu Ohara, Yohei Shintaku, Makoto Hashimoto, Satoshi Horinouchi, Kazushi Yamanaka (Tohoku Univ.) US2010-2
Abstract (in Japanese) (See Japanese page) 
(in English) Nondestructive crack depth measurement is necessary for the evaluation of material strength in aging infrastructure such as atomic power plants. If the crack is open, its depth can be accurately measured. On the other hand, if the crack is closed because of residual stress or by oxide film, the crack depth could be underestimated or overlooked. Thus far, to simulate the SCC generated in atomic power plants, various formation methods were used. However, the difference of closure behavior between the formation methods has yet to be examined. Here we formed SCCs in the specimen with starting notch and pre-crack. Then we imaged them using linear phased array (PA) and subharmonic phased array for crack evaluation (SPACE). By comparing these results and the optically-observed cross section, we discussed the crack closure behavior depending on the formation method.
Keyword (in Japanese) (See Japanese page) 
(in English) Stress corrosion cracks / Crack closure / Ultrasound / Subharmonic phased array / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 10, US2010-2, pp. 5-10, April 2010.
Paper # US2010-2 
Date of Issue 2010-04-15 (US) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF US2010-2

Conference Information
Committee US  
Conference Date 2010-04-22 - 2010-04-22 
Place (in Japanese) (See Japanese page) 
Place (in English) The University of Electro-Communications 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Nonlinear Acoustics, General, etc 
Paper Information
Registration To US 
Conference Code 2010-04-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Imaging of Closed Cracks Using Subharmonic Phased Array 
Sub Title (in English)  
Keyword(1) Stress corrosion cracks  
Keyword(2) Crack closure  
Keyword(3) Ultrasound  
Keyword(4) Subharmonic phased array  
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1st Author's Name Yoshikazu Ohara  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Yohei Shintaku  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Makoto Hashimoto  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Satoshi Horinouchi  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
5th Author's Name Kazushi Yamanaka  
5th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2010-04-22 13:45:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2010-2 
Volume (vol) vol.110 
Number (no) no.10 
Page pp.5-10 
#Pages 6 
Date of Issue 2010-04-15 (US) 

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