Reconfigurability and tunability of the tessellation of Tachi-Miura Polyhedron (TMP), an origami-based cellular structure composed of bellows-like unit cells after its fabrication was investigated. By combining origami-based tessellation design, analytical method with rigid-origami modeling, efficient manufacturing of a prototype, and experimental verification, our research results show that a significant range of in-situ tunability in effective density, Young's modulus, and Poisson's ratio can be obtained within the elastic regime with orders of magnitude changes.
We investigate the extreme wave event in mechanical metamaterials composed of Triangulated Cylindrical Origami (TCO). Specifically, we focused on realizing rogue waves by employing a homogeneous one-dimensional chain constructed from the TCO unit cells. In association with data-driven methods, our numerical simulation suggests the wave focusing on a very limited number of unit cells, which can be potentially realized in the experimental setup. The mechanism of the wave localization using the TCO can be leveraged for efficient energy harvesting purposes in engineering applications.
We demonstrate the vibrational edge mode transfer on the dimer mechanical lattice consists of the Triangulated Cylindrical Origami. The configuration of our dimer lattice can be altered only by twisting the chain, and therefore it does not require any replacement of constituent unit cells. Such in-situ tunable lattice opens the bandgap in the wave dispersion relationships with emerging boundary mode. By twisting the chain excited at boundary mode frequency, our numerical simulation shows high transfer fidelity of the edge state through the lattice. The simple and efficient state transfer can be leveraged for energy manipulation in engineering applications.
We investigate the impact behavior of the Triangulated Cylindrical Origami (TCO) architecture to determine if it can effectively protect a payload dropped from a height. The TCO architecture inherently exhibits coupled longitudinal and rotational motions. TCO is highly tunable and can offer monostable or bistable characteristics based on its initial geometric configurations such as the height and rotational angle. When monostable TCO unit cells are combined in a chain, they can exhibit interesting rarefaction behavior under impact. Specifically, if one end of the chain is impacted, the initial compressive wave can be overtaken by a tensile wave, such that the other end of the chain can feel tension instead of compression in a counter-intuitive manner. In this study, we begin by designing monostable TCO unit cells that are numerically shown to exhibit rarefaction behavior when constructed in chains. Then, we fabricate plastic TCO unit cell prototypes and apply static compression to these prototypes to verify their monostability and to determine their mechanical properties. These unit cells are then organized in a chain of multiple unit cells that are connected mechanically. The chain is then tested dynamically by dropping it using a custom-made drop tower apparatus. We measure the impact felt by the TCO system by using accelerometers and digital image correlation systems. We find that this origami-based system offers a tunable way to mitigate impact applied to the proof mass, showing great potential as a novel payload impact mitigation system for space applications.
We investigate the extreme wave event in mechanical metamaterials composed of Triangulated Cylindrical Origami (TCO). Specifically, we focus on the realization of so-called rogue waves by employing a homogeneous one-dimensional chain constructed from the TCO unit cells. Our numerical simulation shows the significant energy focusing in the very limited number of unit cells. The wave localization behavior varies as a function of the geometrical parameters of the TCO, which enables us to manipulate the wave localization. The configurability of the wave localization using the TCO can be leveraged for energy harvesting purposes in engineering applications.
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