Print Email Facebook Twitter 3D Printed Actuators Title 3D Printed Actuators: Reversibility, Relaxation, and Ratcheting Author Zhao, Song Chuan (Universiteit Leiden; Student TU Delft) Maas, Mariska (Student TU Delft) Jansen, K.M.B. (TU Delft Emerging Materials) van Hecke, Martin (Universiteit Leiden; AMOLF) Date 2019 Abstract Additive manufacturing strives to combine any combination of materials into 3D functional structures and devices, ultimately opening up the possibility of 3D printed machines. It remains difficult to actuate such devices, thus limiting the scope of 3D printed machines to passive devices or necessitating the incorporation of external actuators that are manufactured differently. Here, 3D printed hybrid thermoplast/conducter bilayers are explored, which can be actuated by differential heating caused by externally controllable currents flowing through their conducting faces. The functionality of such actuators is uncovered and it is shown that they allow to 3D print, in one pass, simple flexible robotic structures that propel forward under step-wise applied voltages. Moreover, exploiting the thermoplasticity of the nonconducting plastic parts at elevated temperatures, it is shown that how strong driving leads to irreversible deformations—a form of 4D printing—which also enlarges the range of linear response of the actuators. Finally, it is shown that how to leverage such thermoplastic relaxations to accumulate plastic deformations and obtain very large deformations by alternatively driving both layers of a bilayer; this is called ratcheting. The strategy is scalable and widely applicable, and opens up a new approach to reversible actuation and irreversible 4D printing of arbitrary structures and machines. Subject 3D printing4D printingadditive manufacturingshape morphing To reference this document use: http://resolver.tudelft.nl/uuid:b330ea10-6935-4431-b0ff-062a427fac87 DOI https://doi.org/10.1002/adfm.201905545 ISSN 1616-301X Source Advanced Functional Materials, 29 (51) Part of collection Institutional Repository Document type journal article Rights © 2019 Song Chuan Zhao, Mariska Maas, K.M.B. Jansen, Martin van Hecke Files PDF Zhao_et_al_2019_Advanced_ ... erials.pdf 2.59 MB Close viewer /islandora/object/uuid:b330ea10-6935-4431-b0ff-062a427fac87/datastream/OBJ/view