Origami-based cellular metamaterial with auxetic, bistable, and self-locking properties

Kamrava, Soroush; Mousanezhad, Davood; Ebrahimi, Hamid; Ghosh, Ranajay; Vaziri, Ashkan

doi:10.1038/srep46046

Cited by 165 publications

(75 citation statements)

References 31 publications

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“…Stability is a crucial aspect in the design and construction of engineering structures; understanding their stability has therefore been the primary motivation for much classic analysis in structural mechanics. More recently, structures that are able to switch between two different configurations have attracted interest for applications in which morphing between states is desirable, for example in mechanical metamaterials and origami structures [1,7,14] or in actuators [3]. Various mechanisms have been proposed by which the system may be forced between two stable states including loading via magnetic forces [18,29], fluid flow [2,12,31], changes in lateral confinement [13,11] or, more generally, variations in the natural curvature of a structure [23,24].…”

Section: Introductionmentioning

confidence: 99%

Static bistability of spherical caps

et al. 2018

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Depending on its geometry, a spherical shell may exist in one of two stable states without the application of any external force: there are two 'self-equilibrated' states, one natural and the other inside out (or 'everted'). Though this is familiar from everyday life-an umbrella is remarkably stable, yet a contact lens can be easily turned inside out-the precise shell geometries for which bistability is possible are not known. Here, we use experiments and finite-element simulations to determine the threshold between bistability and monostability for shells of different solid angle. We compare these results with the prediction from shallow shell theory, showing that, when appropriately modified, this offers a very good account of bistability even for relatively deep shells. We then investigate the robustness of this bistability against pointwise indentation. We find that indentation provides a continuous route for transition between the two states for shells whose geometry makes them close to the threshold. However, for thinner shells, indentation leads to asymmetrical buckling before snap-through, while also making these shells more 'robust' to snap-through. Our work sheds new light on the robustness of the 'mirror buckling' symmetry of spherical shell caps.

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Section: Introductionmentioning

confidence: 99%

Static bistability of spherical caps

et al. 2018

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Section: Mechanical Metamaterialsmentioning

confidence: 99%

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

et al. 2019

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Owing to the synergistic combination of a hybrid organic–inorganic nature and a chemically active porous structure, metal–organic frameworks have emerged as a new class of crystalline materials. The current trend in the chemical industry is to utilize such crystals as flexible hosting elements for applications as diverse as gas and energy storage, filtration, catalysis, and sensing. From the physical point of view, metal–organic frameworks are considered molecular crystals with hierarchical structures providing the structure‐related physical properties crucial for future applications of energy transfer, data processing and storage, high‐energy physics, and light manipulation. Here, the perspectives of metal–organic frameworks as a new family of functional materials in modern physics are discussed: from porous metals and superconductors, topological insulators, and classical and quantum memory elements, to optical superstructures, materials for particle physics, and even molecular scale mechanical metamaterials. Based on complementary properties of crystallinity, softness, organic–inorganic nature, and complex hierarchy, a description of how such artificial materials have extended their impact on applied physics to become the mainstream in material science is offered.

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“…Recently, origami has emerged as a promising building block of mechanical metamaterials with versatile functionalities and programmability [7][8][9][10][11][12][13][14][15][16][17], due to its capability of transforming a 2D crease pattern into a complex 3D sculpture, purely geometric traits independent of both scale and constituent materials, and ease of manufacturing [18,19].…”

Section: Introductionmentioning

confidence: 99%

Folding of Tubular Waterbomb

Feng

Chen

et al. 2020

Research

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Origami has recently emerged as a promising building block of mechanical metamaterials because it offers a purely geometric design approach independent of scale and constituent material. The folding mechanics of origami-inspired metamaterials, i.e., whether the deformation involves only rotation of crease lines (rigid origami) or both crease rotation and facet distortion (nonrigid origami), is critical for fine-tuning their mechanical properties yet very difficult to determine for origami patterns with complex behaviors. Here, we characterize the folding of tubular waterbomb using a combined kinematic and structural analysis. We for the first time uncover that a waterbomb tube can undergo a mixed mode involving both rigid origami motion and nonrigid structural deformation, and the transition between them can lead to a substantial change in the stiffness. Furthermore, we derive theoretically the range of geometric parameters for the transition to occur, which paves the road to program the mechanical properties of the waterbomb pattern. We expect that such analysis and design approach will be applicable to more general origami patterns to create innovative programmable metamaterials, serving for a wide range of applications including aerospace systems, soft robotics, morphing structures, and medical devices.

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Origami-based cellular metamaterial with auxetic, bistable, and self-locking properties

Cited by 165 publications

References 31 publications

Static bistability of spherical caps

Static bistability of spherical caps

Metal–Organic Frameworks in Modern Physics: Highlights and Perspectives

Folding of Tubular Waterbomb

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