Origami has recently received significant interest from the scientific community as a method for designing building blocks to construct metamaterials. However, the primary focus has been placed on their kinematic applications by leveraging the compactness and auxeticity of planar origami platforms. Here, we present volumetric origami cells—specifically triangulated cylindrical origami (TCO)—with tunable stability and stiffness, and demonstrate their feasibility as non-volatile mechanical memory storage devices. We show that a pair of TCO cells can develop a double-well potential to store bit information. What makes this origami-based approach more appealing is the realization of two-bit mechanical memory, in which two pairs of TCO cells are interconnected and one pair acts as a control for the other pair. By assembling TCO-based truss structures, we experimentally verify the tunable nature of the TCO units and demonstrate the operation of purely mechanical one- and two-bit memory storage prototypes.
We investigate unique wave dynamics in origami-based mechanical metamaterials composed of volumetric 3D origami unit cells. Specifically, we assemble a chain of lattice structures, in which the Tachi-Miura Polyhedron (TMP) is employed as a building block. We conduct two types of theoretical/computational analysis on this origami-based system. One is the dynamic analysis on the TMP unit cell under harmonic excitations. We find that the system transits from linear to nonlinear regimes or vice versa, depending on the amplitude of the excitation and the initial configurations of the given geometry. This implies that the origami-based system exhibits intrinsic tun-ability of its dynamic behavior by altering these excitation and geometrical parameters. The other analysis is on a dispersion relationship of mechanical waves propagating through the lattice. We analyze a 1D chain of (i) all identical TMP unit cells and (ii) two different unit cells in an alternating arrangement. From this analysis, we show that the origami-based system can create tunable frequency band structures by changing geometrical parameters. By leveraging these unique, tunable wave dynamics, the origami-based mechanical systems have great potential to be used as novel engineering devices that are capable of handling vibrations and impact efficiently.
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