Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 283, Issue -, Pages 187-195Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2018.08.049
Keywords
FDM (fused deposition modeling); SMAs (shape memory alloys); SMPs (shape memory polymers); SMC (shape memory composite); SME (shape memory effect); Nitinol wire; PLA; Flexible PLA; 3D printing; 4D printing; Revisible actuator
Funding
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Education) [NRF-2016R1D1A1A02936936]
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government (Ministry of Trade, Industry and Energy) [20174030201830]
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A fused deposition modeling (FDM) tool was used to fabricate a shape memory composite (SMC) that combined a shape memory alloy (SMA) with a shape memory polymer (SMP). The SMA caused a shape memory effect due to a phase change between martensite and austenite phases, in turn due to a temperature change. Also, the SMP had a shape memory effect caused by changes in the proportions of hard and soft segments near the glass transition temperature (Tg). Usually, common SMAs and SMPs are not reversible, so these materials do not go back to their original shapes once they are deformed. In this study, we fabricated 4D printing actuator via reversible SMC actuations using 3D printing technology. Nylon 12 was used as the 3D printing material in filament form. Moreover, the volume fraction of SMA to SMP was varied to find the optimum ratio for good operation cycles. A volume fraction of SMA:SMP of 1:5 showed the largest length change, of 8 mm, and the most rapid response time, of 4 s in overall dimension of 140mm x lOmm x lmm (lengthxwidthx thickness).Thus, the SMC showed promising results for the application of stents and valve controllers that could be manufactured by 3D printing technology. (C) 2018 Elsevier B.V. All rights reserved.
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