A Review of Thermal Actuation Methods for Thermally-Activated Twisted and Coiled Polymer Actuators
Subject Areas :
Mohammadamir Bakhshi
1
(Department of Solid Mechanics, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran)
Ali Moazemi Goudarzi
2
(Department of Solid Mechanics, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Ira)
Fattaneh Morshedsolouk
3
(Department of Marine Engineering, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran)
Keywords: Actuator, Thermally Activated, Twisted and Coiled, Fishing line, Thermal Actuation,
Abstract :
Recently, a new type of artificial muscle called thermally activated twisted and coiled polymer actuators (TCPAs) has garnered significant attention. These actuators are primarily made from fishing lines or sewing thread, and when actuated by heat, they can contract along their length to produce linear displacement. The low production cost, silent operation, high power-to-weight ratio, and the ability to generate significant displacement in response to thermal stimuli are among the advantages that have made these actuators more appealing compared to other conventional actuators. They are thus emerging as a suitable option for various applications, such as robotics, smart textiles, energy harvesting systems, and more. These actuators (TCPAs) operate by leveraging the expansion and contraction properties of polymer fibers, which are initially twisted by an electric motor and then coiled into a spring-like structure. This construction method enhances the strength and efficiency of the TCPAs. Additionally, these actuators can maintain their performance in diverse environments, including underwater and high-temperature settings. This review explores the fabrication methods, underlying principles, and thermal actuating techniques of these actuators. It also discusses their innovative and emerging applications. Furthermore, the study addresses the challenges in exploiting this technology and proposes possible solutions to optimize their performance.
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