Nondestructive and Destructive Investigation of Bondlines for High-power Multilayer Ultrasonic Transducers for Underwater Sonar

Wu, Z., Cochran, S. , McRobbie, G. and Kirk, K.J. (2005) Nondestructive and Destructive Investigation of Bondlines for High-power Multilayer Ultrasonic Transducers for Underwater Sonar. In: 2005 IEEE International Ultrasonics Symposium, Rotterdam, The Netherlands, 18-21 Sep 2005, pp. 2219-2222. ISBN 9780780393820 (doi: 10.1109/ULTSYM.2005.1603324)

Abstract

Ultrasonic transducers with prestressed mass-spring structures are often used for high power underwater projection in the 20 - 50 kHz frequency range but with the limitation of narrow bandwidth. Multilayer piezoceramic or piezocomposite transducers without prestressing may help solve this problem but will require bondlines able to withstand strong tensile forces. This paper, therefore, reports a systematic investigation of bondline failure encompassing experimental measurements and theoretical analysis. Three different adhesives were investigated, a potting compound, a structural adhesive, and an electricallyconductive adhesive. In this investigation, a series of two-layer length-extensional mode PZT-5H piezoceramic structures were manufactured with the original silver electrodes fired onto the material during ceramic manufacture as the bonding surfaces. The specimens were subjected to static tensile testing at ambient temperature and elevated temperatures up to 100°C, with the failure forces and the bonding surface conditions after failure recorded. Finite element analysis was also used to calculate the tensile stress amplitudes under high levels of static and dynamic electric field excitation. These simulations were then used to analyze possible critical values under various conditions when combined with the experimental results.

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Cochran, Professor Sandy
• Authors: Wu, Z., Cochran, S., McRobbie, G., and Kirk, K.J.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• ISSN: 1051-0117
• ISBN: 9780780393820