Enhanced Resolution Phase Transformations in a Nitinol Cymbal Ultrasonic Device

Smith, S., Li, X. , Hafezi, M., Barron, P., Lucas, M. and Feeney, A. (2022) Enhanced Resolution Phase Transformations in a Nitinol Cymbal Ultrasonic Device. In: 2022 IEEE International Ultrasonics Symposium (IUS), Venice, Italy, 10-13 October 2022, ISBN 9781665466578 (doi: 10.1109/IUS54386.2022.9957560)

Abstract

The traditional form of cymbal transducer is composed of cymbal endcaps bonded to a piezoelectric ceramic, whose radial vibrations drive relatively high amplitude endcap displacements. This transducer has been investigated for sonar and energy harvesting, but recent research has focused on adapting it for higher power applications, such as surgical cutting. In such procedures, there are known challenges in the efficient cutting of different materials, such as bone and muscular tissue, using one device. One viable method is to introduce adaptive dynamic properties, including operating frequency, by fabricating the caps with a shape memory alloy. Here, elastic modulus can be tuned by inducing a phase transformation, allowing rapid control of device dynamics. In this study, the temperature-dependent dynamics of a Nitinol cymbal device are examined using electrical impedance analysis and laser Doppler vibrometry, and practical aspects of introducing Nitinol into such devices are considered. The results show that a mixed austenitic and martensitic microstructure creates intermediate stiffnesses and exhibit the potential to administer minor temperature changes to achieve significant resonance shifts.

• Item Type: Conference Proceedings
• Additional Information: The authors would like to acknowledge the support of the Engineering and Physical Sciences Research Council (EPSRC) through grant EP/V049658/1.
• Status: Published
• Refereed: No
• Glasgow Author(s) Enlighten ID: Feeney, Dr Andrew and Barron, Mr Paul and Hafezi, Dr Mahshid and Lucas, Professor Margaret and Li, Dr Xuan
• Authors: Smith, S., Li, X., Hafezi, M., Barron, P., Lucas, M., and Feeney, A.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• ISSN: 1948-5727
• ISBN: 9781665466578
• Copyright Holders: Copyright © 2022 IEEE
• First Published: First published in Proceedings of the 2022 IEEE International Ultrasonics Symposium (IUS)
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

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Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
312010		Establishing adaptive ultrasonics through shape memory materials	Andrew Feeney	Engineering and Physical Sciences Research Council (EPSRC)	EP/V049658/1	ENG - Systems Power & Energy