Characterization and Analysis of a Flexural Shape Memory Alloy Actuator

• Published in: Actuators Vol. 10; no. 8; p. 202
• Main Authors: Dauksher, Richard, Patterson, Zachary, Majidi, Carmel
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.08.2021
• Subjects: Actuation; Actuators; Bending stresses; Cooling; Design; Efficiency; Electric currents; Energy conversion; finite element analysis; Heat; Ohmic dissipation; Resistance heating; Robotics; Robots; shape memory alloy; Shape memory alloys; soft actuators; soft robotics; Structural design; Titanium alloys; Wire
• DOI: 10.3390/act10080202
• ISSN: 2076-0825

Shape memory alloys (SMAs) are popular as actuators for use in soft robots due to their high work density and compatibility with miniaturized on-board batteries and power electronics. However, because SMA actuators are activated through electrical Joule heating, they exhibit poor energy efficiency and low actuator frequencies that arise from long cool-down times. Moreover, in the case of SMA wires that are subject to flexural loading, their load capacity and mechanical work output decrease exponentially with decreasing cross-sectional area. In this study, we perform analytic and numerical analyses to examine the thermal and structural design space around a particular class of flexural SMA wire actuators with the intention of increasing actuator operating frequency and actuation forces. Measurements obtained through experimental testing are consistent with theoretical studies of actuator force output and provide additional insight into the efficiency of electrical-to-mechanical energy conversion. Together, the theoretical and experimental studies provide insights that have the potential to inform SMA wire design and usage in soft robotic applications.