Strain Transduction in Conductor-Modified Polymers
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J3.6.1
Strain Transduction in Conductor-Modified Polymers Eerik T. Hantsoo, Vanessa B. Chial, Yanan Zhao, Kevin C. Chan, Klint A. Rose, Kenneth S. Wu, and Beth L. Pruitt Department of Mechanical Engineering, Stanford University, CA, USA ABSTRACT We present the fabrication and electromechanical characterization of a class of polymeric high-elongation strain sensors. Samples of polydimethylsiloxane were coated with Creative Materials, Inc.’s 123-27 Electrically Conductive Silicone Ink and the resistance behavior was evaluated in uniaxial tensile tests. Large strains (up to 100%) were observed with monotonically increasing resistance changes. A clear, linear trend up to 65% strain dominated the resistance vs. strain behavior then resistance increased non-linearly. Image processing of the film coupled with a finite element conduction simulation indicate the change in resistance is primarily a geometric effect. Both the conduction path and the polydimethylsiloxane substrate break completely around 100% strain. The samples exhibit a gauge factor of approximately 10. INTRODUCTION Conventional strain gauges are intended to measure small strains (
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