3D Printed Actuators: Reversibility, Relaxation, and Ratcheting

@article{Zhao20193DPA,
  title={3D Printed Actuators: Reversibility, Relaxation, and Ratcheting},
  author={Song-Chuan Zhao and Mariska Maas and Kaspar M. B. Jansen and Martin van Hecke},
  journal={Advanced Functional Materials},
  year={2019},
  volume={29}
}
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… 
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References

SHOWING 1-10 OF 16 REFERENCES
Multi-shape active composites by 3D printing of digital shape memory polymers
TLDR
A theoretical model is developed to predict the deformation behavior of active composites that can take multiple shapes, depending on the environmental temperature, and has a great potential in 4D printing applications.
Active materials by four-dimension printing
We advance a paradigm of printed active composite materials realized by directly printing glassy shape memory polymer fibers in an elastomeric matrix. We imbue the active composites with intelligence
Biomimetic 4D printing.
Shape-morphing systems can be found in many areas, including smart textiles, autonomous robotics, biomedical devices, drug delivery and tissue engineering. The natural analogues of such systems are
Direct 4D printing via active composite materials
TLDR
The markedly simplified creation of high-resolution complex 3D reprogrammable structures promises to enable myriad applications across domains, including medical technology, aerospace, and consumer products, and even suggests a new paradigm in product design, where components are simultaneously designed to inhabit multiple configurations during service.
Pattern Transformation of Heat-Shrinkable Polymer by Three-Dimensional (3D) Printing Technique
TLDR
It is shown that a uniform internal strain is stored in the polymer during the printing process and can be released when heated above its glass transition temperature and used to trigger the pattern transformation of the heat-shrinkable polymer in a controllable way.
Three-Dimensional Printing of pH-Responsive and Functional Polymers on an Affordable Desktop Printer.
TLDR
The synthesis, thermal and rheological characterization, hot-melt extrusion, and three-dimensional printing of poly(2-vinylpyridine) (P2VP) are described and high quality, 3D-printable filaments for material extrusion 3DP (ME3DP) are achieved.
Sequential Self-Folding Structures by 3D Printed Digital Shape Memory Polymers
Folding is ubiquitous in nature with examples ranging from the formation of cellular components to winged insects. It finds technological applications including packaging of solar cells and space
Active Printed Materials for Complex Self-Evolving Deformations
TLDR
A novel approach for simulating and fabricating self-evolving structures that transform into a predetermined shape, changing property and function after fabrication is introduced.
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