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Open AccessArticle

3D-Printed Soft Structure of Polyurethane and Magnetorheological Fluid: A Proof-of-Concept Investigation of its Stiffness Tunability

Smart Structure and Systems Laboratory, Department of Mechanical Engineering, Inha University, Incheon 22212, Korea
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Micromachines 2019, 10(10), 655; https://doi.org/10.3390/mi10100655
Received: 23 August 2019 / Revised: 26 September 2019 / Accepted: 27 September 2019 / Published: 29 September 2019
(This article belongs to the Special Issue 3D Printed Microfluidic Devices and Its Applications)
In this study, a soft structure with its stiffness tunable by an external field is proposed. The proposed soft beam structure consists of a skin structure with channels filled with a magnetorheological fluid (MRF). Two specimens of the soft structure are fabricated by three-dimensional printing and fused deposition modeling. In the fabrication, a nozzle is used to obtain channels in the skin of the thermoplastic polyurethane, while another nozzle is used to fill MRF in the channels. The specimens are tested by using a universal tensile machine to evaluate the relationships between the load and deflection under two different conditions, without and with permanent magnets. It is empirically shown that the stiffness of the proposed soft structure can be altered by activating the magnetic field. View Full-Text
Keywords: three-dimensional printing; magnetorheological fluid; magnetic responsivity; soft structure; tunable elastic stiffness three-dimensional printing; magnetorheological fluid; magnetic responsivity; soft structure; tunable elastic stiffness
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Hong, S.-W.; Yoon, J.-Y.; Kim, S.-H.; Lee, S.-K.; Kim, Y.-R.; Park, Y.-J.; Kim, G.-W.; Choi, S.-B. 3D-Printed Soft Structure of Polyurethane and Magnetorheological Fluid: A Proof-of-Concept Investigation of its Stiffness Tunability. Micromachines 2019, 10, 655.

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