3D Soft Metamaterials with Negative Poisson's Ratio

Babaee, Sahab; Shim, Jongmin; Weaver, James C.; Chen, Elizabeth R.; Patel, Nikita; Bertoldi, Katia

doi:10.1002/adma.201301986

Cited by 694 publications

(486 citation statements)

References 20 publications

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“…Therefore, the structure of the unit cell can be chosen or designed to produce specific material properties. For example, AM has been used to produce ultra light and stiff structures [374], auxetic structures [51][143] [282] and the molds for the unit cells for auxetic structures [32], and could be used to produce the chiral honeycomb auxetic structures proposed by [177]. It has also been used to produce unit cells for acoustic materials with a negative refraction index [358].…”

Section: Lattices Trusses and Cellular Materials For Custom Materialsmentioning

confidence: 99%

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

et al. 2016

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The past few decades have seen substantial growth in Additive Manufacturing (AM) technologies. However, this growth has mainly been process-driven. The evolution of engineering design to take advantage of the possibilities afforded by AM and to manage the constraints associated with the technology has lagged behind. This paper presents the major opportunities, constraints, and economic considerations for Design for Additive Manufacturing. It explores issues related to design and redesign for direct and indirect AM production. It also highlights key industrial applications, outlines future challenges, and identifies promising directions for research and the exploitation of AM's full potential in industry.Design, Manufacturing, Additive Manufacturing

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Section: Lattices Trusses and Cellular Materials For Custom Materialsmentioning

confidence: 99%

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

et al. 2016

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“…[18][19][20][21][22][23] This control is achieved by designing structures with mechanical instabilities that buckle in a predictable way when subjected to mechanical deformation (e.g., compression). [18][19][20]23] Following this approach it is possible to produce structures that undergo large (>50%), isotropic volume changes, and that have negative…”

Section: Introductionmentioning

confidence: 99%

Elastomeric Tiles for the Fabrication of Inflatable Structures

Morin

Kwok

Lessing

et al. 2014

Adv Funct Materials

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This paper describes the fabrication of three-dimensional (3D) soft, inflatable structures from thin, two-dimensional (2D) tiles fabricated from elastomeric polymers. The tiles were connected using soft joints that increased the surface area available for gluing them together, and mechanically reinforced the structures to withstand the tensile forces associated with pneumatic actuation. The ability of the elastomeric polymer to withstand large deformations without failure made it possible to explore and implement new joint designs, for example "double-taper dovetail joints," that cannot be used with hard materials. This approach simplifies the fabrication of soft structures comprised of materials with different physical properties (e.g., stiffness, electrical conductivity, optical transparency), and provides the methods required to "program" the response of these structures to mechanical (e.g., pneumatic pressurization) and other physical (e.g., electrical) stimuli. The flexibility and modularity of this approach was demonstrated in a set of soft structures that expanded or buckled into distinct, predictable shapes when inflated or deflated. These structures combined easily to form extended systems with motions dependent on the configurations of the selected components, and, when fabricated with electrically conductive tiles, electronic circuits with pneumatically-active elements. This approach to the fabrication of hollow, 3D structures provides routes to new soft actuators.

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“…This is true, for example, reentrant, chiral, star-shape structures and rotating units [2][3][4][5][6]. These structures, known as skeletal structures, are well studied, and most of them are periodic and often symmetric as well [7][8][9][10][11][12][13][14][15]. In these structures, the NPR effect only occurs along certain in-plane directions, and the concept of NPR is hardly used in 3D space.…”

Section: Introductionmentioning

confidence: 99%

“…In these structures, the NPR effect only occurs along certain in-plane directions, and the concept of NPR is hardly used in 3D space. So far there are only few studies extending in-plane negative Poisson's ratio effect to 3D space [15][16][17][18][19] and only one structure with orthotropic NPR effect [15]. However, these 3D studies have only focused on certain cellular materials with highly heterogeneous porous microstructures.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of composite structure with in-plane isotropic negative Poisson’s ratio: Effects of materials properties and geometry features of inclusions

Hou

Silberschmidt

2014

Composites Part B: Engineering

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A novel composite structure with isotropic negative Poisson's ratio has been presented in our previous paper [1]. However, the previous study has only focused on the effects of random inclusions. In this work, an extended numerical study on the effects of materials properties and geometry features of inclusions is conducted in order to better understand the deformation mechanism and mechanical properties of this kind of composites. Using finite element method, the overall negative Poisson's ratio effects and mechanical properties of the composites are analyzed in terms of different factors including thickness and stiffness of inclusions with uniform and non-uniform struts. The structure optimization of the composites with better negative Poisson's ratio effect and mechanical performance are discussed based on the numerical calculated results. The study shows that the Poisson's ratio effects and mechanical properties of the composites are significantly affected by geometrical features, stiffness and boundary conditions of inclusions.

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3D Soft Metamaterials with Negative Poisson's Ratio

Cited by 694 publications

References 20 publications

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

Design for Additive Manufacturing: Trends, opportunities, considerations, and constraints

Elastomeric Tiles for the Fabrication of Inflatable Structures

Numerical analysis of composite structure with in-plane isotropic negative Poisson’s ratio: Effects of materials properties and geometry features of inclusions

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