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Paper Abstract and Keywords
Presentation 2026-02-18 13:00
Array imaging using ultrasonic waves refracted at a closed crack interface and application to the depth estimation
Kazuyuki Nakahata, Tomohiro Mesaki, Kei Onodera, Kyosuke Shimizu (Ehime Univ.), Taizo Maruyama (Science Tokyo) US2025-57
Abstract (in Japanese) (See Japanese page) 
(in English) In general, incident ultrasonic waves do not penetrate the faces of an open crack. However, laser-ultrasonic visualization revealed that refracted shear waves are generated at the fatigue crack faces when longitudinal ultrasonic waves are incident obliquely. This phenomenon was confirmed by numerical wave propagation simulations based on the dynamic elastic finite integration technique, which demonstrated that ultrasonic energy leaks through partially contacting crack faces. The simulations further showed that the magnitude of the refracted shear waves varies depending on the contact area at the crack faces. Based on these findings, this study investigates a nondestructive testing approach for fatigue cracks. Specifically, a synthetic-aperture focusing method that utilizes refracted shear waves from the crack faces was applied to estimate fatigue crack depth via imaging. The performance of the proposed method was evaluated through both numerical analyses and experimental measurements.
Keyword (in Japanese) (See Japanese page) 
(in English) fatigue crack / refracted shear wave / sythentic apergure focusing imaging / array transducer / / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 354, US2025-57, pp. 1-4, Feb. 2026.
Paper # US2025-57 
Date of Issue 2026-02-11 (US) 
ISSN 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 US2025-57

Conference Information
Committee US  
Conference Date 2026-02-18 - 2026-02-18 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English) Acoustic imaging, NDT, Ultrasound in medicine, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2026-02-US 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Array imaging using ultrasonic waves refracted at a closed crack interface and application to the depth estimation 
Sub Title (in English)  
Keyword(1) fatigue crack  
Keyword(2) refracted shear wave  
Keyword(3) sythentic apergure focusing imaging  
Keyword(4) array transducer  
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1st Author's Name Kazuyuki Nakahata  
1st Author's Affiliation Ehime University (Ehime Univ.)
2nd Author's Name Tomohiro Mesaki  
2nd Author's Affiliation Ehime University (Ehime Univ.)
3rd Author's Name Kei Onodera  
3rd Author's Affiliation Ehime University (Ehime Univ.)
4th Author's Name Kyosuke Shimizu  
4th Author's Affiliation Ehime University (Ehime Univ.)
5th Author's Name Taizo Maruyama  
5th Author's Affiliation Institute of Science Tokyo (Science Tokyo)
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Speaker Author-1 
Date Time 2026-02-18 13:00:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2025-57 
Volume (vol) vol.125 
Number (no) no.354 
Page pp.1-4 
#Pages 4 
Date of Issue 2026-02-11 (US) 

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