Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 48, Pages 54155-54167Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14206
Keywords
shape memory alloy; knitted actuator; path-dependent; thermal expansion; blocking force
Funding
- NASA Space Technology Research Fellowship [80NSSC17K0158]
- Minnesota's Discovery, Research, and InnoVation Economy Robotics, Sensors, and Advanced Manufacturing (MnDRIVE RSAM) Initiative
- University of Minnesota Office of the Vice President for Research UMII MnDRIVE Graduate Assistantship
- University of Minnesota's Wearable Technology Lab
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This work reexamines traditional shape memory alloy (SMA) loading paths commonly used in SMA-based actuator applications and presents a novel, superimposed condition in which SMA generates substantial forces upon heating and cooling. This atypical effect, which is investigated with a textile-based actuator, was found to be prominent at the completion of material phase transformation, at which point thermal expansion/contraction became the dominant force-generating mechanism. We demonstrate that amplification of generated forces can be accomplished by varying the applied thermal load, applied structural strain, as well as actuator architecture. Specifically, we present SMA knitted actuators as an actuator architecture that increases the effect by aggregating SMA wires within a complex strain profile-effectively providing a larger operational window for the effect to propagate. The amplification of blocking forces through this novel operational procedure suggests reconsidering traditional blocking force design paradigms and opens untapped actuator application spaces, such as the highlighted medical and aerospace wearable technologies.
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