Nylon coil actuator operating temperature range and stiffness

Soheil Kianzad; Milind Pandit; Addie Bahi; Ali Rafiee; Frank Ko; Geoffrey M. Spinks; John D. W. Madden

doi:10.1117/12.2085601

29 April 2015 Nylon coil actuator operating temperature range and stiffness

Soheil Kianzad, Milind Pandit, Addie Bahi, Ali Rafiee, Frank Ko, Geoffrey M. Spinks, John D. W. Madden

Proceedings Volume 9430, Electroactive Polymer Actuators and Devices (EAPAD) 2015; 94301X (2015) https://doi.org/10.1117/12.2085601
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2015, San Diego, California, United States

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.

Citation Download Citation

Soheil Kianzad, Milind Pandit, Addie Bahi, Ali Rafiee, Frank Ko, Geoffrey M. Spinks, and John D. W. Madden "Nylon coil actuator operating temperature range and stiffness", Proc. SPIE 9430, Electroactive Polymer Actuators and Devices (EAPAD) 2015, 94301X (29 April 2015); https://doi.org/10.1117/12.2085601

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