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Proceedings Paper

Pulsatile dielectric elastomer membrane sensors
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Paper Abstract

Dielectric elastomer (DE) membranes are one of the most promising transducers for developing in situ sensors for the vasculature. It is widely accepted that diseased arteries at various stages have a unique constitutive response. This means that the output of an in situ artery sensor would have distinct profiles corresponding to various stages of unhealth. An in situ sensor can potentially allow access to information about the mechanical state of the artery that is not currently available. Furthermore, the potential to combine the functions of providing structural support (stent) and monitoring the mechanical state (sensor) is truly unique (multifunctionality). Traditional sensors such as strain gages and piezoelectric sensors are stiff and fail at low strains (<1%) whereas some dielectric elastomers are viable at strains up to and even surpassing 100%. Investigating the electromechanical response of a deformable tube sensor sandwiched between a pulsating pressure source and a nonlinear elastic distensible thick wall has not been attempted before now. The successful development of a multiphysics model that correlates the electrical output of a pulsatile membrane sensor to its state of strain would be a significant breakthrough in medical diagnostics. The artery is modeled numerically and represented theoretically as a fiber reinforced tubular membrane subject to a pulsating pressure signal. In this paper, the fundamental mechanics associated with electromechanical coupling during dynamic finite deformations of DEs is derived. A continuum model for the dynamic response of tubular dielectric elastomer membranes configured for sensing is presented.

Paper Details

Date Published: 6 April 2009
PDF: 12 pages
Proc. SPIE 7287, Electroactive Polymer Actuators and Devices (EAPAD) 2009, 72870K (6 April 2009); doi: 10.1117/12.816081
Show Author Affiliations
Seyul Son, Virginia Polytechnic Institute and State Univ. (United States)
N. C. Goulbourne, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 7287:
Electroactive Polymer Actuators and Devices (EAPAD) 2009
Yoseph Bar-Cohen; Thomas Wallmersperger, Editor(s)

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