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Shape memory alloy based 3D printed composite actuators with variable stiffness and large reversible deformation
RISE Research Institutes of Sweden, Digital Systems, Smart Hardware.ORCID iD: 0000-0002-3548-547X
University of Kent, UK.
Singapore University of Technology and Design, Singapore.
Singapore University of Technology and Design, Singapore.
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2021 (English)In: Sensors and Actuators A-Physical, ISSN 0924-4247, E-ISSN 1873-3069, Vol. 321, article id 112598Article in journal (Refereed) Published
Abstract [en]

Soft composite actuators can be fabricated by embedding shape memory alloy (SMA) wires into soft polymer matrices. Shape retention and recovery of these actuators are typically achieved by incorporating shape memory polymer segments into the actuator structure. However, this requires complex manufacturing processes. This work uses multimaterial 3D printing to fabricate composite actuators with variable stiffness capable of shape retention and recovery. The hinges of the bending actuators presented here are printed from a soft elastomeric layer as well as a rigid shape memory polymer (SMP) layer. The SMA wires are embedded eccentrically over the entire length of the printed structure to provide the actuation bending force, while the resistive wires are embedded into the SMP layer of the hinges to change the temperature and the bending stiffness of the actuator hinges via Joule heating. The temperature of the embedded SMA wire and the printed SMP segments is changed sequentially to accomplish a large bending deformation, retention of the deformed shape, and recovery of the original shape, without applying any external mechanical force. The SMP layer thickness was varied to investigate its effect on shape retention and recovery. A nonlinear finite element model was used to predict the deformation of the actuators. 

Place, publisher, year, edition, pages
Elsevier B.V. , 2021. Vol. 321, article id 112598
Keywords [en]
3D printing, Composite actuator, Finite element modeling, Shape memory alloy, Shape memory polymer
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:ri:diva-52490DOI: 10.1016/j.sna.2021.112598Scopus ID: 2-s2.0-85100811246OAI: oai:DiVA.org:ri-52490DiVA, id: diva2:1532376
Note

Funding details: Agency for Science, Technology and Research, A*STAR; Funding details: National Research Foundation Singapore, NRF; Funding details: National Research Foundation of Korea, NRF; Funding details: Singapore University of Technology and Design, SUTD; Funding details: Digital Manufacturing and Design Centre, Singapore University of Technology and Design, DMAND, SUTD; Funding details: Pacific Salmon Foundation, PSF, 1521200086; Funding text 1: The authors acknowledge support from SUTD Digital Manufacturing and Design Centre (DManD) funded by Singapore National Research Foundation (NRF). Q. G. acknowledges the support from the Agency for Science , Technology and Research (A*STAR) Public Sector Funding (PSF) (Project number 1521200086 ), the U.S. Office of Naval Research Global ( ONRG ), and the SUTD Start-up Research Grant.

Available from: 2021-03-01 Created: 2021-03-01 Last updated: 2023-10-30Bibliographically approved

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Akbari, Saeed

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