Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

Easey, Nathanael; Chuprynyuk, Dmytro; Musa, W M Syazwan Wan; Bangs, Angus; Dobah, Yousef; Shterenlikht, Anton; Scarpa, Fabrizio

doi:10.3389/fmats.2019.00086

Cited by 37 publications

(27 citation statements)

References 40 publications

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“…4b. The existing literature recognizes the instability issue of domes due to snap-through buckling, which can be resolved by introducing the auxetic lattice structure 34 .…”

Section: Resultsmentioning

confidence: 99%

“…By virtue of it, they exhibit synclastic behavior when they are bent, which is deformed into dome shape 31 , 32 , instead of saddle type deformations, which are typically observed in structures with positive Poisson’s ratio. In addition, auxetic based domes show reduced snap-through in comparison with conventional lattices and solid dome 34 .…”

Section: Introductionmentioning

confidence: 98%

“…It can be deduced from the existing literature, that the dome based lattice structures have been rarely explored in metastructure design 31,32 , even though such structures have shown good potential in tuning the stiffness and Poisson's ratio [33][34][35] . We have expanded the design space of metastructures by integrating the advantage of lattice geometry with the enhanced tunability of the hourglass shape.…”

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confidence: 99%

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Exploring the dynamics of hourglass shaped lattice metastructures

Gupta

Adhikari

Bhattacharya

2020

Sci Rep

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Continuous demand for the improvement of mechanical performance of engineering structures pushes the need for metastructures to fulfil multiple functions. Extensive work on lattice-based metastructure has shown their ability to manipulate wave propagation and producing bandgaps at specific frequency ranges. Enhanced customizability makes them ideal candidates for multifunctional applications. This paper explores a wide range of nonlinear mechanical behavior that can be generated out of the same lattice material by changing the building block into dome shaped structures which improves the functionality of material significantly. We propose a novel hourglass shaped lattice metastructure that takes advantage of the combination of two oppositely oriented coaxial domes, providing an opportunity for higher customizability and the ability to tailor its dynamic response. Six new classes of hourglass shaped lattice metastructures have been developed through combinations of solid shells, regular honeycomb lattices and auxetic lattices. Numerical simulation, analytical modelling, additive layer manufacturing (3D printing) and experimental testing are implemented to justify the evaluation of their mechanics and reveal the underlying physics responsible for their unusual nonlinear behaviour. We further obtained the lattice dependent frequency response and damping offered by the various classes of hourglass metastructures. This study paves the way for incorporating hourglass based oscillators to be used as building block of future mechanical metamaterials, leading to a new class of tunable metamaterial over a wide range of operating frequencies. The proposed class of metastructure will be useful in applications where lightweight and tunable properties with broadband vibration suppression and wave attenuation abilities are necessary.

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“…4b. The existing literature recognizes the instability issue of domes due to snap-through buckling, which can be resolved by introducing the auxetic lattice structure 34 .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

mentioning

confidence: 99%

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Exploring the dynamics of hourglass shaped lattice metastructures

Gupta

Adhikari

Bhattacharya

2020

Sci Rep

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“…That is why some researchers choose to analyze this type of panels using the FEM. [98,99] Easey et al [87] in a preliminary nonlinear elastic FE study of four cellular topologies (hexagonal, re-entrant, arrow, and tri-chiral) using full 3D solid theory and an isotropic elastic homogeneous materials showed no sensitivity to υ. Finally, authors successfully validated the FE models of auxetic cellular domes by accurate and optimized DIC method.…”

Section: Methodsmentioning

confidence: 99%

“…The relevant work for dome-shaped auxetic structures is the paper by Easey et al [87] The authors optimized the digital image correlation (DIC) method and used it to successfully validate the finite element (FE) models of auxetic cellular domes. Very good agreement was achieved between DIC and FE for the onset of buckling and postbuckling response, including strain, displacement, and loads.…”

mentioning

confidence: 99%

Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels

Peliński

Smardzewski

Narojczyk

2020

Physica Status Solidi (b)

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The research in materials with auxetic properties [1] (i.e., exhibiting negative Poisson's ratio [2] at least in some directions) has been growing for about 30 years. The manufacturing of the first man-made auxetic foam by Lakes [3] as well as the formulation and solution of the first mechanical [4,5] and thermodynamic models [6,7] explaining their unusual mechanical properties sparked an ongoing interest and intense studies of these interesting novel materials. Over these past 30 years, the studies on auxetics diverge into different aspects. Among others, the search for auxetic properties in new materials, [8,9] the theoretical studies of various models exhibiting auxetic properties, [10-46] or the creation of auxetic composites [47,48] to enhance mechanical properties of materials. The latter is of particular importance if one considers practical applications of negative Poisson's ratio materials. [49-55] In this respect, auxetic structures [24,54,56-66] are interesting (among others) in terms of improving stiffness and durability of materials. They tend to form synclastic, sphere-like shapes instead of anticlastic curvature which is characteristic for common materials with positive Poisson's ratio, subjected to bending. [67-69] Nowadays in wood industry, furniture which were designed with the use of synclastic shapes, are typically made from bent steel frame (usually upholstered), plastics, or bent plywood. Technology of bent plywood is strictly connected with thermophysical treatment, mold casting, and temperature-pressure bending process. The process is both time-and resourceconsuming. Furthermore, with the development of each new shape, expensive procedure of a new mold preparation and implementation into technological process is required. This situation could be significantly improved by implementation of auxetic structures into the industry. Auxetic structures improve several of mechanical properties, especially shear, impact, and bending resistance. They also improve ability to absorb impact energy as well as improve overall stiffness of structure. [65,66] Despite promising results of mechanical characteristics in the work by Smardzewski, [70] concerning examination of multilayered sandwich panels, particularly honeycomb panels with auxetic core manufactured from wood-based materials, to the date, the literature lacks research on the use of auxetic structures in wood-based composites. International research is focused on innovative, light composites, that could reduce the cost of product manufacturing by reducing material usage and overall product weight. Thus, in effect reducing also costs related to logistics. [70,71] Such composites could replace typically used wood-based materials such as particleboard, low, medium, and high-density fiberboard (LDF, MDF, and HDF) or plywood. Many studies [67,72-78] deal with honeycomb sandwich panels and their usage in wood industry for the purpose of door filling, vertical, and horizontal elements of furniture body, package filling, etc. Sandwich panels should have ...

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The Twisting of Dome‐Like Metamaterial from Brittle to Ductile

et al. 2021

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Architected materials can exhibit mechanical properties that do not occur with ordinary solids. By integrating hierarchy and size effects, microarchitected metamaterials fabricated by two-photon lithography with a metallic or ceramic coating can be ultrastrong but lightweight. However, the attainment of both strength and ductility is generally mutually exclusive. Inspired by the Pantheon dome in Rome, which can withstand high load while keeping low density, microarchitected domes with a gradient helix are designed and deposited in a hierarchical nanostructured aluminum film with ultrahigh strength and considerable plasticity. Despite having a thick coating, which usually causes catastrophic collapse, the thick-walled metallic dome shows recoverability during compression. The compressive strength increases to 73 times that of current ductile-like microlattices, leading to the metamaterial occupying the domain of the material property space that is hitherto empty. Detailed in situ experimental and computational work reveals the graceful (noncatastrophic) failure due to the helical twisting and plastic flow in the supra-nanomaterial. It is a promising method of suppressing brittle failure via a combination of architectural and material design. It can be used to impart enhanced functionality, making programmable stiffness, and tailored energy absorption all possible.

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Dome-Shape Auxetic Cellular Metamaterials: Manufacturing, Modeling, and Testing

Cited by 37 publications

References 40 publications

Exploring the dynamics of hourglass shaped lattice metastructures

Exploring the dynamics of hourglass shaped lattice metastructures

Stiffness of Synclastic Wood‐Based Auxetic Sandwich Panels

The Twisting of Dome‐Like Metamaterial from Brittle to Ductile

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