Auxetic materials in design and architecture

Papadopoulou, Athina; Laucks, Jared; Tibbits, Skylar

doi:10.1038/natrevmats.2017.78

Cited by 92 publications

(51 citation statements)

References 1 publication

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“…(9) and (13) for the prescribed decrease and increase, respectively, of the cell dimension in x-direction, while the theoretical y of the hybrid kite-arrowhead unit cell were computed from Eqs. (26) and (42) for the imposed decrease and increase, respectively, of the cell dimension in x-direction. Comparison of the theoretical and experimental strains in Fig.…”

Section: Methodsmentioning

confidence: 99%

Metamaterials with Poisson’s ratio sign toggling by means of microstructural duality

Lim

2019

SN Appl. Sci.

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Neither positive nor negative Poisson's ratio materials are fully advantageous across a wide range of load bearing applications. In some cases, it is advantageous for structures to possess duality in material properties so as to take advantage of auxetic behavior under one loading condition as well as conventional behavior when the loading condition changes. This paper proposes two metamaterials-the hybrid rhombic-re-entrant metamaterial and the hybrid kite-arrowhead metamaterial-in which the prescription of either compressive or tensile load always leads to lateral expansion. Specifically, the Poisson's ratio of these metamaterials range from negative infinity to zero upon tensile load, and from zero to positive infinity upon compressive load. This duality of auxetic and conventional behavior for each of these metamaterial is achieved by employing a simultaneous lock and slide mechanism that is interchangeable upon load reversal. When loaded in one direction, the locked part takes effect while the sliding part becomes redundant. Upon load direction reversal, the previously locked and sliding parts convert to sliding and locked parts, respectively, thereby activating the redundant part while deactivating the functional part. The change in effective microstructural components, therefore, facilitates Poisson's ratio sign toggling with load reversal. Due to the indiscriminate lateral expansion regardless of the axial loading direction, such behavior in a fiber is useful to resist both fiber pull-out as well as fiber push-out from the matrix material.

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Section: Methodsmentioning

confidence: 99%

Metamaterials with Poisson’s ratio sign toggling by means of microstructural duality

Lim

2019

SN Appl. Sci.

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“…Despite the increasing availability of additive manufacturing techniques such as 3D printing 36 , the fabrication of auxetic metamaterials with highly controlled microstructures may remain a limiting factor in their use and development 2,37 , particularly on larger scale. In this regard, the enrichment of the auxetic class by the multifarious group of random fibre networks in general, and by the easy-to-produce electrospun membranes in particular, appears as a promising alternative route.…”

Section: Discussionmentioning

confidence: 99%

Random auxetics from buckling fibre networks

et al. 2019

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Auxetic materials have gained increasing interest in the last decades, fostered by auspicious applications in various fields. While the design of new auxetics has largely focused on metamaterials with deterministic, periodically arranged structures, we show here by theoretical and numerical analysis that pronounced auxetic behaviour with negative Poisson's ratios of very large magnitude can occur in random fibre networks with slender, reasonably straight fibre segments that buckle and deflect. We further demonstrate in experiments that such auxetic fibre networks, which increase their thickness by an order of magnitude and more than quintuple their volume when moderately extended, can be produced by electrospinning. Our results thus augment the class of auxetics by a large group of straightforwardly fabricable meta-materials with stochastic microstructure.

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“…Lakes performed pioneering investigations on negative Poisson's ratio properties of polyurethane (PU) foam with reentrant structure. According to the geometrical patterns and deformation features, auxetics can be classified as: reentrant, rigid rotation, elastic buckling, origami and chiral structures, etc . As a special type of auxetic materials, chiral metastructures cannot be superimposed onto its mirror body by simple rigid rotations and spatial translations.…”

Section: Introductionmentioning

confidence: 99%

Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

Niu

Liang

et al. 2019

Physica Status Solidi (b)

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Auxetics with negative Poisson's ratio (NPR) can expand dimensions along the direction perpendicular to the tensile direction, such as rigid rotation, reentrant and chiral structures, etc. The mechanical performances of chiral metastructures are closely related to internal defects and interactions between defects. In this paper, two types of irregular chiral structures with Gaussian dispersion of circular node positions and missing ligaments are designed, namely: antitetrachiral metastructure and tetrachiral hybrid metastructure. These two types of chiral metastructures are characterized by node radius, ligament thickness, ligament length, the circular node center dispersion range, and missing ligament percentages. Effects of random node distribution range and cell wall missing percentage on the elastic modulus and Poisson's ratio of chiral metastructures are investigated through experimental tests and finite element (FE) simulation systematically. Through dimensionless analysis, it is found that ligament thickness has remarkable influence on the negative Poisson's ratio. Effect of missing ligament on the mechanical properties of the structure is greater than effect of random node center dispersion. With the increase of ligament missing percentage, the resultant modulus of chiral metastructures decreases, and the corresponding NPR increases.

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Auxetic materials in design and architecture

Cited by 92 publications

References 1 publication

Metamaterials with Poisson’s ratio sign toggling by means of microstructural duality

Metamaterials with Poisson’s ratio sign toggling by means of microstructural duality

Random auxetics from buckling fibre networks

Effects of Disordered Circular Nodes Dispersion and Missing Ligaments on the Mechanical Properties of Chiral Structures

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