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Proceedings Paper

Nylon coil actuator operating temperature range and stiffness
Author(s): Soheil Kianzad; Milind Pandit; Addie Bahi; Ali Rafiee; Frank Ko; Geoffrey M. Spinks; John D. W. Madden
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Paper Abstract

Components in automotive and aerospace applications require a wide temperature range of operation. Newly discovered thermally active Baughman muscle potentially provides affordable and viable solutions for driving mechanical devices by heating them from room temperature, but little is known about their operation below room temperature. We study the mechanical behavior of nylon coil actuators by testing elastic modulus and by investigating tensile stroke as a function of temperature. Loads that range from 35 MPa to 155 MPa were applied. For the nylon used and the coiling conditions, active thermal contraction totals 19.5 % when the temperature is raised from -40 °C to 160 °C. The thermal contraction observed from -40 °C to 20°C is only ~2 %, whereas between 100 and 160 °C the contraction is 10 %. A marked increase in thermal contraction is occurs in the vicinity of the glass transition temperature (~ 45°C). The elastic modulus drops as temperature increases, from ~155 MPa at – 40 °C to 35 MPa at 200 °C. Interestingly the drop in active contraction with increasing load is small and much less than might be expected given the temperature dependence of modulus.

Paper Details

Date Published: 29 April 2015
PDF: 6 pages
Proc. SPIE 9430, Electroactive Polymer Actuators and Devices (EAPAD) 2015, 94301X (29 April 2015); doi: 10.1117/12.2085601
Show Author Affiliations
Soheil Kianzad, The Univ. of British Columbia (Canada)
Milind Pandit, The Univ. of British Columbia (Canada)
Addie Bahi, The Univ. of British Columbia (Canada)
Ali Rafiee, The Univ. of British Columbia (Canada)
Frank Ko, The Univ. of British Columbia (Canada)
Geoffrey M. Spinks, Univ. of Wollongong (Australia)
John D. W. Madden, The Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 9430:
Electroactive Polymer Actuators and Devices (EAPAD) 2015
Yoseph Bar-Cohen, Editor(s)

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