Presentation Title

The Processing and Characterization of Nylon Twisted Coiled Polymer Actuator with an Integrated Nichrome Wire Heating Element

Faculty Mentor

Dr. Jayesh Bhakta

Start Date

23-11-2019 10:45 AM

End Date

23-11-2019 11:30 AM

Location

160

Session

poster 4

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

Artificial muscles or Twisted Coiled Polymers (TCP) are actuators based on the observation that a polymer filament that is twisted to the point of self-coiling and further processed will contract upon heating. TCPs have potential applications in soft robotics. We investigated the processing and characterization of TCPs made from 0.7mm diameter nylon monofilament fishing line co-twisted with 36 AWG nichrome heater wire. An apparatus for coiling the filament and heater wire under constant tension was constructed. A toaster oven was modified for performing annealing and electro-thermo-mechanical testing. The optimal tension for coiling the filament was found to be 2.5N. The coiled filament was annealed, after releasing residual torsion just after coiling, for about 30 mins at (145±5)°C while under a 2.5N tension to produce the TCP. For testing, a pulsed current of 150mA was applied in 2 minute on/off cycles to the heater wire integrated into the TCP, while it was under a tension of 2.5N, and the resulting strain measured. It was found that hysteresis of the strain/current relationship was removed after about 20 cycles of the pulsed current. With a 180mA current, the TCP reached a maximum contraction of 20% strain after 120s.

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Nov 23rd, 10:45 AM Nov 23rd, 11:30 AM

The Processing and Characterization of Nylon Twisted Coiled Polymer Actuator with an Integrated Nichrome Wire Heating Element

160

Artificial muscles or Twisted Coiled Polymers (TCP) are actuators based on the observation that a polymer filament that is twisted to the point of self-coiling and further processed will contract upon heating. TCPs have potential applications in soft robotics. We investigated the processing and characterization of TCPs made from 0.7mm diameter nylon monofilament fishing line co-twisted with 36 AWG nichrome heater wire. An apparatus for coiling the filament and heater wire under constant tension was constructed. A toaster oven was modified for performing annealing and electro-thermo-mechanical testing. The optimal tension for coiling the filament was found to be 2.5N. The coiled filament was annealed, after releasing residual torsion just after coiling, for about 30 mins at (145±5)°C while under a 2.5N tension to produce the TCP. For testing, a pulsed current of 150mA was applied in 2 minute on/off cycles to the heater wire integrated into the TCP, while it was under a tension of 2.5N, and the resulting strain measured. It was found that hysteresis of the strain/current relationship was removed after about 20 cycles of the pulsed current. With a 180mA current, the TCP reached a maximum contraction of 20% strain after 120s.