Experimental study of electrical point shorts in laminated Terfenol-D

Julie C. Slaughter

doi:10.1117/12.474999

11 July 2002 Experimental study of electrical point shorts in laminated Terfenol-D

Julie C. Slaughter

Proceedings Volume 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics; (2002) https://doi.org/10.1117/12.474999
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

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.

Citation Download Citation

Julie C. Slaughter "Experimental study of electrical point shorts in laminated Terfenol-D", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); https://doi.org/10.1117/12.474999

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