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Proceedings Paper

Experimental study of electrical point shorts in laminated Terfenol-D
Author(s): Julie C. Slaughter
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Paper Abstract

It is well known that laminating TERFENOL-D drivers for high frequency operation reduces eddy current losses. However, there are questions regarding the effectiveness of the lamination if there is an electrical short between two adjacent laminae. Because of the high electrical resistivity of the epoxy used for lamination, these electrical shorts are most likely caused by metal particles or other impurities penetrating the epoxy layer, referred to here as 'point shorts'. The effects of electrical point shorts between adjacent laminae in TERFENOL-D drivers have been investigated. TERFENOL-D drivers with specific configurations of point shorts were fabricated and tested. The drivers were tested in two simple configurations, the first with its resonant frequency below the eddy current critical frequency for the lamina thickness, 7 kHz, and the second with its resonance above the critical frequency, 19 kHz. A comparison of solid drivers with completely shorted drivers show that the effect of laminating the TERFENOL-D is not nullified by the presence of an electrical short. In fact, comparing a completely shorted driver with a perfectly laminated driver indicates that there is very little, if any, performance degradation due to the presence of electrical shorts.

Paper Details

Date Published: 11 July 2002
PDF: 8 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474999
Show Author Affiliations
Julie C. Slaughter, ETREMA Products, Inc. (United States)

Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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