Shape Memory Alloy (SMA)‐Based Microscale Actuators with 60% Deformation Rate and 1.6 kHz Actuation Speed

Shape memory alloys (SMAs) are widely utilized as an actuation source in microscale devices, since they have a simple actuation mechanism and high‐power density. However, they have limitations in terms of strain range and actuation speed. High‐speed microscale SMA actuators are developed having diam...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2018-06, Vol.14 (23), p.e1801023-n/a
Main Authors: Lee, Hyun‐Taek, Kim, Min‐Soo, Lee, Gil‐Yong, Kim, Chung‐Soo, Ahn, Sung‐Hoon
Format: Article
Language:English
Subjects:
Actuation
Actuators
artificial muscles
Biomedical materials
Cooling rate
Deformation
Deformation effects
Deformation mechanisms
Diamonds
Elongated structure
Frame structures
Laser beam heating
Laser cooling
micro actuators
Muscles
Nanotechnology
Scale effect
Shape memory
Shape memory alloys
Tensile deformation
Thermal energy
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Summary:Shape memory alloys (SMAs) are widely utilized as an actuation source in microscale devices, since they have a simple actuation mechanism and high‐power density. However, they have limitations in terms of strain range and actuation speed. High‐speed microscale SMA actuators are developed having diamond‐shaped frame structures with a diameter of 25 µm. These structures allow for a large elongation range compared with bulk SMA materials, with the aid of spring‐like behavior under tensile deformation. These actuators are validated in terms of their applicability as an artificial muscle in microscale by investigating their behavior under mechanical deformation and changes in thermal conditions. The shape memory effect is triggered by delivering thermal energy with a laser. The fast heating and cooling phenomenon caused by the scale effect allows high‐speed actuation up to 1600 Hz. It is expected that the proposed actuators will contribute to the development of soft robots and biomedical devices. High‐speed shape memory alloy (SMA)‐ based microscale actuators are developed. Diamond‐shaped frame structures allow large elongation ranges (60%) compared with the bulk material. The fast heating and cooling phenomenon caused by the scale effect achieves high‐speed actuation up to 1600 Hz, which is 30 times faster than the previously reported maximum actuation speed of SMA.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201801023