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Proceedings Paper

Fabrication of a self-sensing electroactive polymer bimorph actuator based on polyvinylidene fluoride and its electrostrictive terpolymer
Author(s): Leeya Engel; Kyle R. Van Volkinburg; Moti Ben-David; Gregory N. Washington; Slava Krylov; Yosi Shacham-Diamand
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Paper Abstract

In this paper, we report on the fabrication of a self-sensing electroactive polymer cantilevered bimorph beam actuator and its frequency response. Tip deflections of the beam, induced by applying an AC signal across ferroelectric relaxor polyvinylidene fluoride-trifluoroethylene chlorotrifluoroethylene (P(VDF-TrFE-CTFE)), reached a magnitude of 350μm under a field of ~55MV/m and were recorded externally using a laser Doppler vibrometer (LDV). Deflections were determined simultaneously by applying a sensing model to the voltage measured across the bimorph’s integrated layer of piezoelectric polymer polyvinylidene fluoride (PVDF). The sensing model treats the structure as a simple Euler- Bernoulli cantilevered beam with two distributed active elements represented through the use of generalized functions and offers a method through which real time tip deflection can be measured without the need for external visualization. When not being used as a sensing element, the PVDF layer can provide an additional means for actuation of the beam via the converse piezoelectric effect, resulting in bidirectional control of the beam's deflections. Integration of flexible sensing elements together with modeling of the electroactive polymer beam can benefit the developing field of polymer microactuators which have applications in soft robotics as "smart" prosthetics/implants, haptic displays, tools for less invasive surgery, and sensing.

Paper Details

Date Published: 15 April 2016
PDF: 11 pages
Proc. SPIE 9798, Electroactive Polymer Actuators and Devices (EAPAD) 2016, 97980M (15 April 2016); doi: 10.1117/12.2218383
Show Author Affiliations
Leeya Engel, Tel Aviv Univ. (Israel)
Kyle R. Van Volkinburg, Univ. of California, Irvine (United States)
Moti Ben-David, Tel Aviv Univ. (Israel)
Gregory N. Washington, Univ. of California, Irvine (United States)
Slava Krylov, Tel Aviv Univ. (Israel)
Yosi Shacham-Diamand, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 9798:
Electroactive Polymer Actuators and Devices (EAPAD) 2016
Yoseph Bar-Cohen; Frédéric Vidal, Editor(s)

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