We investigate the unique mechanical properties of reentrant 3D origami structures based on Tachi-Miura polyhedron (TMP). explore potential usage as metamaterials that exhibit tunable negative Poisson's ratio and structural bistability simultaneously. show analytically experimentally changes from positive to vice versa during its folding motion. In addition, we verify bistable mechanism TMP under rigid configurations without relying buckling motions planar surfaces. This study forms a...

Origami has recently received significant interest from the scientific community as a method for designing building blocks to construct metamaterials. However, primary focus been placed on their kinematic applications by leveraging compactness and auxeticity of planar origami platforms. Here, we present volumetric cells-specifically triangulated cylindrical (TCO)-with tunable stability stiffness, demonstrate feasibility non-volatile mechanical memory storage devices. We show that pair TCO...

The principles underlying the art of origami paper folding can be applied to design sophisticated metamaterials with unique mechanical properties. By exploiting flat crease patterns that determine dynamic and unfolding motion origami, we are able an origami-based metamaterial form rarefaction solitary waves. Our analytical, numerical, experimental results demonstrate this wave overtakes initial compressive strain waves, thereby causing latter part structure feel tension first instead...

A concept demonstrator of the structural health monitoring (SHM) system was developed to autonomously detect degradation mechanical integrity standoff carbon–carbon (C–C) thermal protection (TPS) panels. This enables us identify location loosened bolts, as well predict torque levels those bolts accordingly. In process building proposed SHM prototype, efforts have been focused primarily on developing a trustworthy diagnostic scheme and responsive sensor suite. part I study, an...

Inspired by the quantum spin Hall effect shown topological insulators, we propose a plate structure that can be used to demonstrate pseudospin for flexural waves. The system consists of thin with periodically arranged resonators mounted on its top surface. We extend technique based plane-wave expansion method identify double Dirac cone emerging due zone-folding in frequency band structures. This particular design allows us move lower than resonating local resonators. then manipulate pattern...

In the present work, we experimentally implement, numerically compute with, and theoretically analyze a configuration in form of single column woodpile periodic structure. Our main finding is that Hertzian, locally resonant, lattice offers test bed for formation genuinely traveling waves composed strongly localized solitary wave on top small amplitude oscillatory tail. This type wave, called nanopteron, not only motivated numerically, but also visualized by means laser Doppler vibrometer....

Abstract Demonstration of topological boundary modes in elastic systems has attracted a great deal attention over the past few years due to its unique protection characteristic. Recently, second-order insulators have been proposed manipulating topologically protected localized states emerging only at corners. Here, we numerically and experimentally study corner two-dimensional phononic crystal, namely continuous plate with embedded bolts hexagonal pattern. We create interfacial corners by...

We examine the role of strong nonlinearity on topologically-robust edge state in a one-dimensional system. consider chain inspired from Su-Schrieffer-Heeger model, but with finite-frequency and dynamics governed by second-order differential equations. introduce cubic onsite-nonlinearity study this nonlinear effect state's frequency linear stability. Nonlinear continuation reveals that loses its typical shape enforced chiral symmetry becomes generally unstable due to various types...

We study the interaction of highly nonlinear solitary waves propagating in granular crystals with an adjacent linear elastic medium. investigate effects interface dynamics on reflection incident and formation primary secondary reflected waves. Experimental tests are performed to correlate medium geometry, materials, mass propagation compare experimental results theoretical analysis based long-wavelength approximation numerical predictions obtained from discrete particle models. found be...

We numerically investigate and experimentally demonstrate an in situ topological band transition a highly tunable mechanical system made of cylindrical granular particles. This allows us to tune its interparticle stiffness controllable way, simply by changing the contact angles between cylinders. The spatial variation particles' results system's topology. manifests as emergence boundary mode finite system, which we observe via laser Doppler vibrometry. When two topologically different...

We investigate the nonlinear wave dynamics of origami-based metamaterials composed Tachi-Miura polyhedron (TMP) unit cells. These cells exhibit strain softening behavior under compression, which can be tuned by modifying their geometrical configurations or initial folded conditions. assemble these TMP into a cluster metamaterials, and we theoretically model numerically analyze transmission mechanism external impact. Numerical simulations show that provide prototypical platform for formation...

Abstract In this research, we aim to combine origami units with vibration-filtering metastructures. By employing the bistable structure as resonant unit cells, propose metastructures low-frequency vibration isolation ability. The geometrical nonlinearity of building block is harnessed for adjustable stiffness metastructure’s unit. quantitative relationship between overall and geometric parameter revealed through potential energy analysis. Both static dynamic experiments are conducted on cell...

The leaf-like origami structure is inspired by geometric patterns found in nature, exhibiting unique transitions between open and closed shapes. With a bistable energy landscape, able to replicate the autonomous grasping of objects observed biological systems such as Venus flytrap. We show uniform motions origami, well various nonuniform that arise from its multitransformable nature. Grasping can be triggered with high tunability due structure's landscape. demonstrate self-adaptive motion...

Abstract Topological mechanical metamaterials have been widely explored for their boundary states, which can be robustly isolated or transported in a controlled manner. However, such systems often require pre-configured design complex active actuation wave manipulation. Here, we present the possibility of in-situ transfer topological modes by leveraging reconfigurability intrinsic twisted origami lattices. In particular, employ dimer Kresling system consisting unit cells with opposite...

The research presented in this paper is motivated by the need for reliable inspection technology detection of bolt loosening carbon–carbon (C–C) thermal protection system (TPS) panels using minimal human intervention. Based on diagnostic scheme proposed part I study, a new PZT (lead zirconate titanate)-embedded sensor washer was developed to constitute network. suite included C–C TPS prototype without jeopardizing integrity original fastening components. sensor-embedded enhances remote...

We propose a new biomedical sensing technique based on highly nonlinear solitary waves to assess orthopaedic implant stability in nondestructive and efficient manner. assemble granular crystal actuator consisting of one-dimensional tightly packed array spherical particles, generate acoustic waves. Via direct contact with the specimen, we inject into prosthesis, nondestructively evaluate mechanical integrity bone–prosthesis interface, studying properties reflected from zone between implant....

In the present work motivated by generalized forms of Hertzian dynamics associated with granular crystals, we consider possibility such models to give rise both shock and rarefaction waves. Depending on value $p$ nonlinearity exponent, find that these possibilities are realizable. We use a quasi-continuum approximation inviscid Burgers model in order predict solution profile up times near formation, as well estimate when it will occur. Beyond time threshold, oscillations discrete nature...