Hierarchical mechanical metamaterials built with scalable tristable elements for ternary logic operation and amplitude modulation
Open Access
- 26 February 2021
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science Advances
- Vol. 7 (9), eabf1966
- https://doi.org/10.1126/sciadv.abf1966
Abstract
Multistable mechanical metamaterials are artificial materials whose microarchitectures offer more than two different stable configurations. Existing multistable mechanical metamaterials mainly rely on origami/kirigami-inspired designs, snap-through instability, and microstructured soft mechanisms, with mostly bistable fundamental unit cells. Scalable, tristable structural elements that can be built up to form mechanical metamaterials with an extremely large number of programmable stable configurations remains illusive. Here, we harness the elastic tensile/compressive asymmetry of kirigami microstructures to design a class of scalable X-shaped tristable structures. Using these structure as building block elements, hierarchical mechanical metamaterials with one-dimensional (1D) cylindrical geometries, 2D square lattices, and 3D cubic/octahedral lattices are designed and demonstrated, with capabilities of torsional multistability or independent controlled multidirectional multistability. The number of stable states increases exponentially with the cell number of mechanical metamaterials. The versatile multistability and structural diversity allow demonstrative applications in mechanical ternary logic operators and amplitude modulators with unusual functionalities.Keywords
Funding Information
- National Natural Science Foundation of China (11722217)
- National Natural Science Foundation of China (11921002)
- Tsinghua National Laboratory for Information Science and Technology
- Tsinghua University Initiative Scientific Research Program (2019Z08QCX10)
- Guo Qiang, Tsinghua University (2019GQG1012)
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