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Proceedings Paper

High-force cofired multilayer actuators
Author(s): Keith Bridger; Lorianne Jones; Fred Poppe; Steven A. Brown; Stephen R. Winzer
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Paper Abstract

Various structural control applications (e.g., high-precision machining) require high-force actuation. Actuators made by stacking and gluing plates are not suitable for many of these applications because, unless the plates are very thin (< 1 mm), the glued stack requires high voltages (> 1 kV) and stacks of very thin plates require extreme care in fabrication to avoid compliance due to the joints. This paper describes an effort to fabricate high-force, co- fired multilayer actuators. The actuator modules were designed to be approximately 50 mm X 50 mm X 20 mm (height), with 20 1-mm thick layers and a 12.7-mm diameter hole in the center for a prestress bolt. The modules were to be stacked together to form an actuator capable of delivering > 50 micrometers stroke at 5 degree(s)C under a load of approximately 10,000 lb. The major challenge in this task is fabricating the co-fired modules because of their size. It is exceptionally difficult to burnout and sinter such a large multilayer device without introducing flaws such as delaminations and, to the best of our knowledge, this had never been done successfully before. Three co-fired, high force actuator modules were fabricated and electrically and mechanically characterized. The capacitance of the actuator modules ranged from 1.5 to 9.4 (mu) F. Co-fired actuators gave modulus values of 12.2 X 106 psi (at E equals 1 MV/m) which was close to the modulus of the material. The peak-peak strain of an actuator module at 0 prestress was 600 ppm (at a field of E equals 1 MV/m). At 2000 psi prestress, the strain measured was about 450 ppm (p-p).

Paper Details

Date Published: 1 May 1996
PDF: 12 pages
Proc. SPIE 2721, Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies, (1 May 1996); doi: 10.1117/12.239146
Show Author Affiliations
Keith Bridger, SMS Technologies Inc. (United States)
Lorianne Jones, Lockheed Martin Missiles and Space Co., Inc. (United States)
Fred Poppe, Lockheed Martin Missiles and Space Co., Inc. (United States)
Steven A. Brown, Lockheed Martin Missiles and Space Co., Inc. (United States)
Stephen R. Winzer, Lockheed Martin Missiles and Space Co., Inc. (United States)


Published in SPIE Proceedings Vol. 2721:
Smart Structures and Materials 1996: Industrial and Commercial Applications of Smart Structures Technologies
C. Robert Crowe, Editor(s)

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