Hierarchical honeycomb auxetic metamaterials

Mousanezhad, Davood; Babaee, Sahab; Ebrahimi, Hamid; Ghosh, Ranajay; Hamouda, A.M.S.; Bertoldi, Katia; Vaziri, Ashkan

doi:10.1038/srep18306

Cited by 156 publications

(90 citation statements)

References 31 publications

(38 reference statements)

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“…This also permits the production of custom-designed systems even at industrial scales at a relative low cost. Of particular interest are auxetics incorporating elements of hierarchy19202122, with the hierarchical rotating square structure proposed by Cho et al 23. and Gatt et al 24.…”

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confidence: 99%

On the dynamics and control of mechanical properties of hierarchical rotating rigid unit auxetics

Dudek

Gatt

Mizzi

et al. 2017

Sci Rep

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In this work, we investigate the deformation mechanism of auxetic hierarchical rotating square systems through a dynamics approach. We show how their deformation behaviour, hence their mechanical properties and final configuration for a given applied load, can be manipulated solely by altering the resistance to rotational motion of the hinges within the system. This provides enhanced tunability without necessarily changing the geometry of the system, a phenomenon which is not typically observed in other non-hierarchical unimode auxetic systems. This gives this hierarchical system increased versatility and tunability thus making it more amenable to be employed in practical application which may range from smart filtration to smart dressings.

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confidence: 99%

On the dynamics and control of mechanical properties of hierarchical rotating rigid unit auxetics

Dudek

Gatt

Mizzi

et al. 2017

Sci Rep

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“…The mechanisms and fabrication of auxetic microstructures has been extensively studied1920212223242526. Considering the shift in technology towards designing and applying functional materials across a wide range of length-scales, our study focuses on reproducibly achieving practical man-made materials with auxeticity and other unique functionalities.…”

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confidence: 99%

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Tanaka

Suga

Iwata

et al. 2017

Sci Rep

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Anisotropic materials form inside living tissue and are widely applied in engineered structures, where sophisticated structural and functional design principles are essential to employing these materials. This paper presents a candidate laminated open-cell framework, which is an anisotropic material that shows remarkable mechanical performance. Using additive manufacturing, artificial frameworks are fabricated by lamination of in-plane orthotropic microstructures made of elbowed beam and column members; this fabricated structure features orthogonal anisotropy in three-dimensional space. Uniaxial loading tests reveal strong auxeticity (high negative Poisson’s ratios) in the out-of-plane direction, which is retained reproducibly up to the nonlinear elastic region, and is equal under tensile and compressive loading. Finite element simulations support the observed auxetic behaviors for a unit cell in the periodic framework, which preserve the theoretical elastic properties of an orthogonal solid. These findings open the possibility of conceptual materials design based on geometry.

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“…Unlike the re‐entrant and the rotational structures, the auxetic effect in the holes structure is only found above the critical value of a compression strain. Since then, the instability mechanism for NPR has been implemented to many other structures …”

Section: Introductionmentioning

confidence: 99%

“…Since then, the instability mechanism for NPR has been implemented to many other structures. [13,[42][43][44][45][46] All the aforementioned auxetic examples are the beam-like or void structures. How to obtain an auxetic continuum that does not contain voids is a curious issue and respectable attempts have been made in recent years.…”

Section: Introductionmentioning

confidence: 99%

Auxeticity from the Folded Geometry: A Numerical Study

Chen

Zulifqar

2019

Physica Status Solidi (b)

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The folded geometry has successfully been transformed into auxetic woven fabric in the literature. However, the influences of the microgeometric parameters on the macroscopic behavior have not been addressed yet. Herein, several key microgeometric parameters for the folded geometry are identified and the mechanical behaviors of the folded structure are preliminarily studied using the finite element method. The results show that the folded structure can be unfolded in both longitudinal and transverse directions when stretched and thus achieve a negative Poisson's ratio. More interestingly, another fantastic property of tension–bending coupling effect is found in the folded structure and a competition exists between the auxeticity and the tension–bending coupling effect. This is the first time to report a structure that can stimulatingly have the auxeticity and the tension–bending coupling effect. Due to the unique properties, the folded geometry is very promising in some important fields; for example, the textiles, civil engineering, and auto industry. The present work may provide a good guide for the design and application of the folded structure.

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Hierarchical honeycomb auxetic metamaterials

Cited by 156 publications

References 31 publications

On the dynamics and control of mechanical properties of hierarchical rotating rigid unit auxetics

On the dynamics and control of mechanical properties of hierarchical rotating rigid unit auxetics

Orthotropic Laminated Open-cell Frameworks Retaining Strong Auxeticity under Large Uniaxial Loading

Auxeticity from the Folded Geometry: A Numerical Study

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