3D cellular metamaterials with planar anti-chiral topology

Ebrahimi, Hamid; Mousanezhad, Davood; Nayeb-Hashemi, Hamid; Norato, Julián A.; Vaziri, Ashkan

doi:10.1016/j.matdes.2018.02.052

Cited by 105 publications

(40 citation statements)

References 45 publications

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“…FEM and AM used in conjunction could facilitate such a parametric study with relative ease, for example by varying repeated structures [262]. AM structure's Poisson's ratio can be tuned by altering the geometry of a unit cell [263][264][265], enabling the design and analysis of novel auxetic structures using FEM [266,267] to help validate existing analytical formulae. Matlab has also been used to run FEM parametric analysis [167].…”

Section: Additively Manufactured 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: Additively Manufactured 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

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“…Wu et al [43] innovatively proposed two types of 3D chiral metamaterials ( Figure 4a), namely chiral-chiral-antichiral and chiralantichiral-antichiral metamaterials, making use of node rotation and ligament bending deformation features of chiral structures. Connecting the planar antichiral structures by oblique loadbearing ligaments, Ebrahimi et al [44] created a new class of 3D cellular metamaterials ( Figure 4b) with a wide range of Poisson's ratio from À1.5 to 1 in the out-of-plane direction. The planar antichiral structures could be substituted by planer chiral structures with circular loops and square loops for designing 3D chiral auxetic metamaterials, as shown in Figure 4c.…”

Section: Chiral Structuresmentioning

confidence: 99%

Section: Re-entrant Structuresmentioning

confidence: 99%

“…Utilizing this technique, 2D and 3D chiral AMMs have been made from single photosensitive material. [39,44,52,124] To enhance the auxetic behavior and mechanical properties of AMMs, some researchers have fabricated re-entrant structures [59,125,126] and missing ribs [38] by the multimaterial PolyJet technique, which could simultaneously print more than two types of materials in one part. Compared with 3D re-entrant auxetic metamaterials with single material, dual-material auxetic metamaterials have stable NPR at large strain.…”

Section: Additive Manufacturingmentioning

confidence: 99%

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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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“…Dual material auxetic re-entrant structure AM structure's Poisson's ratio can be tuned by altering the geometry of a unit cell [168][169][170], enabling the design and analysis of novel auxetic structures using FEM [171,172] to help validate existing analytical formulae. NinjaFlex ® , an elastic and flexible thermoplastic PU, has been used in the AM of auxetic structures [161,[173][174][175], and in impact testing studies [174,175], with FEM used to highlight auxetic structures' desired impact force attenuation.…”

Section: Figure 23mentioning

confidence: 99%

Auxetic foams for sports applications

Duncan¹

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Bell helped extend the research techniques surrounding polymer chemistry. Advice, support and equipment access was provided by Jamie Boulding who operates the Instron devices and ovens used for foam conversion at Sheffield Hallam. Help was also provided in the engineering workshops by Tim O'Hara, Will Tierney, Robin Sykes, Jeremy Bladen and Simon Apps. Terry Senior from the Centre of Sports Engineering Research helped with the design of moulds and experiments, and the whole of the Equipment Mechanics Research Theme gave advice and support throughout. The Faculty of Arts, Computing, Engineering and Science provided funding though their Graduate Teaching Associate scheme, along with valuable training and the chance to share research with students.

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3D cellular metamaterials with planar anti-chiral topology

Cited by 105 publications

References 45 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

Auxetic foams for sports applications

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