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Paper Abstract and Keywords
Presentation 2026-07-29 15:45
Time Dependent Behavior of the Material Parameters of Ring Shaped Piezoelectric Ceramics in Mechanically Prestressed Langevin Transducers
Claus Scheidemann, Tobias Hemsel (Paderborn Univ.) US2026-38
Abstract (in Japanese) (See Japanese page) 
(in English) Accurate knowledge of piezoelectric material parameters is essential for the model-based design of ultrasonic transducers. The analytical methods defined in international standards are based on specific sample geometries, which differ from the ring-shaped piezoelectric ceramics typically used in transducers. To obtain material parameters that truly represent the ceramics used and to reduce experimental effort, new determination methods are being developed within a current research project [1]. It is known that the mechanical prestress applied in bolted Langevin transducers alters material parameters and thus influences the resonance frequency. However, little information is available on how the complete parameter set required for finite element design changes with mechanical prestress and elapsed time so far. To investigate the time-dependent influence of mechanical prestress on material characteristics, a dedicated setup has been built to apply a defined homogeneous uniaxial stress on ring-shaped PZT and lead-free ceramics. While continuously driving the ceramics on a low power level, electromechanical properties have been monitored over 50 hours. Long-term admittance measurement results are presented as well as results of an iterative model based parameter identification process. Resonance and antiresonance frequency increase with the prestress applied. As well, they both increase over time following a decadic trend. The frequency distance of resonance and antiresonance frequency decreases, indicating reduced electromechanical coupling. These findings highlight the need to consider time- and stress-dependent effects when tuning ultrasonic system components for optimum performance.
Keyword (in Japanese) (See Japanese page) 
(in English) Piezoelectric ceramics / Mechanical prestress / Ultrasonic transducers / Time-dependent behavior / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 131, US2026-38, pp. 26-28, July 2026.
Paper # US2026-38 
Date of Issue 2026-07-22 (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 US2026-38

Conference Information
Committee US  
Conference Date 2026-07-29 - 2026-07-29 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Osaka Suita Campus 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Material characterization, Ultrasonics, etc. 
Paper Information
Registration To US 
Conference Code 2026-07-US 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Time Dependent Behavior of the Material Parameters of Ring Shaped Piezoelectric Ceramics in Mechanically Prestressed Langevin Transducers 
Sub Title (in English)  
Keyword(1) Piezoelectric ceramics  
Keyword(2) Mechanical prestress  
Keyword(3) Ultrasonic transducers  
Keyword(4) Time-dependent behavior  
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1st Author's Name Claus Scheidemann  
1st Author's Affiliation Paderborn University (Paderborn Univ.)
2nd Author's Name Tobias Hemsel  
2nd Author's Affiliation Paderborn University (Paderborn Univ.)
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Speaker Author-1 
Date Time 2026-07-29 15:45:00 
Presentation Time 25 minutes 
Registration for US 
Paper # US2026-38 
Volume (vol) vol.126 
Number (no) no.131 
Page pp.26-28 
#Pages 3 
Date of Issue 2026-07-22 (US) 

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