Multi-Objective Design Optimization of a Shape Memory Alloy Flexural Actuator†
AbstractThis paper presents a computational model and design optimization strategy for shape memory alloy (SMA) flexural actuators. These actuators consist of curved SMA wires embedded within elastic structures; one potential application is positioning microcatheters inside blood vessels during clinical treatments. Each SMA wire is shape-set to an initial curvature and inserted along the neutral axis of a straight elastic member (cast polydimethylsiloxane, PDMS). The elastic structure preloads the SMA, reducing the equilibrium curvature of the composite actuator. Temperature-induced phase transformations in the SMA are achieved via Joule heating, enabling strain recovery and increased bending (increased curvature) in the actuator. Actuator behavior is modeled using the homogenized energy framework, and the effects of two critical design parameters (initial SMA curvature and flexural rigidity of the elastic sleeve) on activation curvature are investigated. Finally, a multi-objective genetic algorithm is utilized to optimize actuator performance and generate a Pareto frontier, which is subsequently experimentally validated. View Full-Text
Share & Cite This Article
Haigh, C.D.; Crews, J.H.; Wang, S.; Buckner, G.D. Multi-Objective Design Optimization of a Shape Memory Alloy Flexural Actuator. Actuators 2019, 8, 13.
Haigh CD, Crews JH, Wang S, Buckner GD. Multi-Objective Design Optimization of a Shape Memory Alloy Flexural Actuator. Actuators. 2019; 8(1):13.Chicago/Turabian Style
Haigh, Casey D.; Crews, John H.; Wang, Shiquan; Buckner, Gregory D. 2019. "Multi-Objective Design Optimization of a Shape Memory Alloy Flexural Actuator." Actuators 8, no. 1: 13.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.