Elastic properties of two novel auxetic 3D cellular structures

Lu, Zixing; Wang, Qingsong; Li, Xiang; Yang, Zhenyu

doi:10.1016/j.ijsolstr.2017.05.031

Cited by 84 publications

(27 citation statements)

References 43 publications

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“…The effect of design changes on Young's modulus and Poisson's ratio can be adjusted and improved before manufacture [121], and FEM can validate analytical results [151][152][153][154][155][156][157][158]. Full validation of FEM often requires comparison and agreement with experimental testing [159][160][161][162][163][164][165][166][167], which can potentially lead to extrapolation or tailoring of models for specific applications.…”

Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

228

151

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Following high profile, life changing long term mental illnesses and fatalities in sports such as skiing, cricket and American football-sports injuries feature regularly in national and international news. A mismatch between equipment certification tests, user expectations and infield falls and collisions is thought to affect risk perception, increasing the prevalence and severity of injuries. Auxetic foams, structures and textiles have been suggested for application to sporting goods, particularly protective equipment, due to their unique form-fitting deformation and curvature, high energy absorption and high indentation resistance. The purpose of this critical review is to communicate how auxetics could be useful to sports equipment (with a focus on injury prevention), and clearly lay out the steps required to realise their expected benefits. Initial overviews of auxetic materials and sporting protective equipment are followed by a description of common auxetic materials and structures, and how to produce them in foams, textiles and Additively Manufactured structures. Beneficial characteristics, limitations and commercial prospects are discussed, leading to a consideration of possible further work required to realise potential uses (such as in personal protective equipment and highly conformable garments).

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Section: Modelling Auxetic Materials and Structuresmentioning

confidence: 99%

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Duncan

Shepherd

Moroney³

et al. 2018

Applied Sciences

228

151

View full text Add to dashboard Cite

show abstract

“…It was found that this hybrid structure had uniform auxetic behavior in all three principal directions with Poisson's ratio close to À1. [49] In recent years, it is noteworthy that several novel 3D chiral structures with unique auxetic behaviors have emerged. As shown in Figure 4h, Frenzel et al [50] innovatively designed a 3D chiral structure unit which twisted under compression.…”

Section: Chiral Structuresmentioning

confidence: 99%

Section: Re-entrant Structuresmentioning

confidence: 99%

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

et al. 2020

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Auxetic mechanical metamaterials (AMMs), as an exciting paradigm of metamaterials, have attracted increasing attention due to their interesting mechanical properties (e.g. negative Poisson's ratio), as well as the emergence of advanced manufacturing technology (e.g. 3D printing). Although various reviews on AMMs, their structures, properties, and applications, have existed, it still lacks a comprehensive review in terms of manufacturing methods. Herein, the latest progress in AMMs is extensively reviewed, including AMMs' structures, characteristics, manufacturing methods, and applications. In addition, the current challenges and future works of AMMs are concluded and discussed. This Review aims to serve as a collection of knowledge that supplies more comprehensive understanding and inspiration to support further developments of AMMs from the perspective of design and manufacturing.

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“…Unlike traditional composites, the extraordinary properties of metamaterials are usually derived from their microstructure units with special configurations rather than the simple superposition of component materials. The negative Poisson’s ratio of mechanical metamaterials usually comes from their concave configuration [ 22 , 23 , 24 , 25 ] or chiral structure [ 26 , 27 , 28 , 29 , 30 ]. In order to achieve the negative effective density of elastic metamaterials, lumped mass is introduced into a subwavelength unit [ 4 ], resulting in dipole resonance.…”

Section: Introductionmentioning

confidence: 99%

Band Gaps and Vibration Isolation of a Three-dimensional Metamaterial with a Star Structure

et al. 2020

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Elastic metamaterials have promising applications in wave control and vibration isolation, due to their extraordinary characteristics, e.g., negative Poisson ratio, band gaps, effective negative mass density and effective negative modulus. How to develop new functional metamaterials using a special structure has always been a hot topic in this field. In this study, a three-dimensional (3D) star structure is designed to construct metamaterials with both negative static and dynamic properties. The results show that the 3D star structure formed a wide band gap at lower frequency and had a negative Poisson’s ratio. Different from conventional acoustic metamaterials, the main physical mechanism behind the low-frequency band gap of the 3D star structure is the resonance mode formed by the bending deformation of each rib plate, which made it easier to achieve effective isolation of low-frequency elastic waves with a low mass density. In addition, many structural parameters of the 3D star structure can be modulated to effectively adjust the band gap frequency by changing the angle between the concave nodes and aspect ratio. This study provides a new way to design the 3D acoustic metamaterials and develop the lightweight vibration isolation devices.

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Elastic properties of two novel auxetic 3D cellular structures

Cited by 84 publications

References 43 publications

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Review of Auxetic Materials for Sports Applications: Expanding Options in Comfort and Protection

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

Band Gaps and Vibration Isolation of a Three-dimensional Metamaterial with a Star Structure

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