2D auxetic metamaterials with tuneable micro-/nanoscale apertures

Mizzi, Luke; Salvati, Enrico; Spaggiari, Andrea; Tan, Jin‐Chong; Korsunsky, Alexander M.

doi:10.1016/j.apmt.2020.100780

Cited by 23 publications

(16 citation statements)

References 60 publications

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“…The mechanical properties (both Poisson’s ratio and Young’s modulus) obtained for on-axis loading (Orientation = 0°) are congruent with those obtained from previous analytical, numerical and experimental studies on rotating square and anti-tetrachiral honeycombs. 18,23,35,36,41–43,49,50…”

Section: Resultsmentioning

confidence: 99%

“…These two systems have been extensively studied throughout the years using analytical, numerical and experimental techniques. 18,23,31,33–35 They have also been investigated in various related forms, apart from the ideal and regular geometries shown in Figure 1, including as perforated systems, 36–43 non-porous structures, 44 composites, 45,46 sandwich systems 47,48 and even irregular variants. 49–52…”

Section: Introductionmentioning

confidence: 99%

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A comparison between rotating squares and anti-tetrachiral systems: Influence of ligaments on the multi-axial mechanical response

Mizzi

Sorrentino

Spaggiari

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Rotating unit systems are one of the most important and well-known classes of auxetic mechanical metamaterials. As their name implies, when loaded, these systems deform primarily via rotation of blocks of material, which may be connected together either directly through joints (or ‘joint-like’ connections made by overlapping vertices of the rotating units) as in the case of rotating rigid polygonal-unit systems or by ligaments/ribs as in the case of chiral honeycombs. In this work, we used Finite Element Analysis to investigate the effect which the presence/absence of ligaments has on the on-axis and off-axis mechanical properties of these systems by analysing two of the most well-known structures which characterise these two cases: the rotating square system and the anti-tetrachiral honeycomb. It was found that while the presence of ligaments has a negligible effect on the on-axis Poisson’s ratio of these systems, it has a profound influence on nearly all other mechanical properties as well as on the off-axis loading behaviour. Systems with ligaments were found to exhibit a high level of anisotropy and also a severely reduced level of stiffness in comparison to their non-ligamented counterparts. On the other hand, the rotating square system suffers from high localized stress-intensities and has a very low strain-tolerance threshold. In addition, an optimized ‘hybrid’ geometry which is specifically designed to capture the best features of both the anti-tetrachiral and rotating square system, was also analysed. This work shows the main differences between ligament-based and non-ligament-based auxetic structures and also highlights the importance of considering the off-axis mechanical response in addition to the on-axis properties when investigating such systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison between rotating squares and anti-tetrachiral systems: Influence of ligaments on the multi-axial mechanical response

Mizzi

Sorrentino

Spaggiari

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…[ 46 ] Adapting the geometry of each unit cell enables to tune the negative Poisson's ratio. [ 47 ] Their excellent mechanical properties such as indentation resistance, [ 48 ] superior energy absorption, and fracture resistance can be attributed to the redistribution of stress over the entire structure. [ 49 ]…”

Section: Biomimetic Design Strategies: Scaffold‐based and Scaffold‐fr...mentioning

confidence: 99%

The Synergy of Biomimetic Design Strategies for Tissue Constructs

Haag

Dalton

Bloemen

2022

Adv Funct Materials

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The regeneration and repair of complex structures, interfaces, and mechanical properties present in natural tissues remains a challenge. To move beyond simplified tissue engineered constructs, nature is a source of inspiration for complex, hierarchical scaffold designs. Recent advances in additive manufacturing allow for increasingly complex fabrication of architectures that better mimic the multiscale structure-function relationship found in natural tissues. In this review, scaffold-based and scaffold-free approaches and the synergistic use of fabrication technologies (two things make a third) to produce more biomimetic implants are described. Recent advanced scaffold designs such as auxetic mechanical metamaterials and induced fibrillar alignment are highlighted. Next, the pre-programmed assembly of spheroids, tissue strands, and other modular building blocks without the need for permanent exogenous scaffold support are discussed. Furthermore, the application of hybridized manufacturing processes to fabricate hierarchical functional constructs is outlined for the osteochondral unit, vascular grafts, and peripheral nerves.

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“…Mechanical metamaterials [1,2,3,4,5,6,7,8,9,10,11,12,13] are rationally-designed structures capable of exhibiting a plethora of atypical mechanical properties that are rarely observed in the case of naturally-occurring materials. Some of the most commonly studied of such properties are negative Poisson's ratio [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29] (auxetic behaviour), negative stiffness [30,31,32,33,34] and negative compressibility [35,36].…”

Section: Introductionmentioning

confidence: 99%

Variable Dual Auxeticity of the Hierarchical Mechanical Metamaterial Composed of Re‐Entrant Structural Motifs

Dudek

Martínez

Kadic

2022

Physica Status Solidi (b)

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In this work, a novel hierarchical mechanical metamaterial is proposed that is composed of re-entrant truss-lattice elements. It is shown that this system can deform very differently and can exhibit a versatile extent of the auxetic behaviour depending on a small change in the thickness of its hinges. In addition, depending on which hierarchical level is deforming, the whole structure can exhibit a different type of auxetic behaviour that corresponds to a unique deformation mechanism. This results in a dual auxetic structure where the interplay between the two auxetic mechanisms determines the evolution of the system. It is also shown that depending on the specific deformation pattern, it is possible to observe a very different behaviour of the structure in terms of frequencies of waves that can be transmitted through the system. In fact, it is demonstrated that even a very small change in the parametric design of the system may result in a significantly different band gap formation that can be useful in the design of tunable vibration dampers or sensors. The possibility of controlling the extent of the auxeticity also makes the proposed metamaterial to be very appealing from the point of view of protective and biomedical devices.

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2D auxetic metamaterials with tuneable micro-/nanoscale apertures

Cited by 23 publications

References 60 publications

A comparison between rotating squares and anti-tetrachiral systems: Influence of ligaments on the multi-axial mechanical response

A comparison between rotating squares and anti-tetrachiral systems: Influence of ligaments on the multi-axial mechanical response

The Synergy of Biomimetic Design Strategies for Tissue Constructs

Variable Dual Auxeticity of the Hierarchical Mechanical Metamaterial Composed of Re‐Entrant Structural Motifs

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