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research article

Designing compliant mechanisms composed of shape memory alloy and actuated by induction heating

Thabuis, Adrien  
•
Thomas, Sean  
•
Martinez, Thomas Guillaume  
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August 18, 2021
Smart Materials and Structures

Shape Memory Alloys (SMAs) are a type of smart materials that reacts mechanically to heat. Due to their complex behavior, they are often used in a simple geometry such as wires. This constrains the output displacement of the alloy to a simple linear contraction of the wire. When a different output displacement is desired, the SMA is coupled to a mechanism that transforms the motion, degrading the compactness of the whole system. To alleviate such issues, we propose fabricating, directly in SMA, a compliant mechanism that performs complex output motions and thus improves integration. The first part of this paper presents a method to design such systems. When coupled with a bias-spring and a heating system, these mechanisms form a full actuator. The conventional heating system relies on Joules losses coming from direct electric conduction through the alloy. However, now that the SMA has a complex shape, passing a current through it becomes an arduous task requiring multiple electrodes making the system cumbersome and deteriorating its integrability. Magnetic induction heating is proposed to tackle this limitation, heating the mechanism without contact and conserving a compact actuator.

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Type
research article
DOI
10.1088/1361-665X/ac1b15
Author(s)
Thabuis, Adrien  
Thomas, Sean  
Martinez, Thomas Guillaume  
Germano, Paolo  
Perriard, Yves  
Date Issued

2021-08-18

Published in
Smart Materials and Structures
Volume

30

Issue

9

Start page

1

End page

12, 095025

Subjects

actuator

•

smart materials

•

bias-spring

•

topology optimization

•

coil

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LAI  
Available on Infoscience
August 18, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/180716
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