New Zero Poisson's Ratio Structures

Gaál, Vladimir; Dantas, Simone; Galvão, Douglas S.; Fonseca, Alexandre F.

doi:10.1002/pssr.201900564

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…We concentrated our study on the FDM printer since this methodology has been previously used in this kind of work. [ 5,6,75 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 1 ] This potential has been exploited in a plethora of areas, like economy, [ 2 ] education, [ 3 ] and, in especial, it has contributed to a new perspective in materials science. [ 4–6 ] One of the interests of this field is to improve and/or to tune the mechanical properties of materials for applications in automotive, [ 7,8 ] aerospace, [ 9 ] civil, [ 10 ] and biomedical [ 11 ] fields, among others. In this sense, nature is a good source of inspiration, where we have many examples that structures, shapes, topologies, and hierarchical geometrical designs are parameters of fundamental importance to determine the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of 3D printed macroscopic models of schwarzites

et al. 2021

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Additive manufacturing allows to produce parts with complex geometries is an essential tool in materials science. Schwarzites is a class of carbon allotropes with interesting mechanical properties. However, most of the schwarzite studies are theoretical until now because the synthesis of large schwarzite fragments remains elusive. In this work, we have carried out molecular dynamics simulations, and extensive experimental tests of 3D printed schwarzites to study their mechanical behavior. Our results show that this behavior does not strongly depend on printed used material, model size, or the number of structural unit cells. We also observed a strong correlation between the stress‐strain curves of 3D printed and the ones obtained from fully atomistic molecular dynamics simulations. Both results show the same trends for almost all investigated schwarzites, suggesting that topological features and scale‐size invariant dominate some deformation mechanisms. Our results further validate the use of atomic models of materials with complex geometries that are impractical or very difficult to synthesize, translated into macro models that can be 3D printed, and offer an innovative engineered approach to produce new materials with tunable mechanical behavior.

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“…We concentrated our study on the FDM printer since this methodology has been previously used in this kind of work. [ 5,6,75 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical properties of 3D printed macroscopic models of schwarzites

et al. 2021

Self Cite

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“…In addition to NPR structures, cellular solids with zero Poisson's ratio (ZPR) have also gained attention, especially in shape-morphing applications [14][15][16]. Strongly strain-dependent Poisson's ratios in ZPR structure can also impose limitations on the structural performance since shape morphing materials and structures are, by design, expected to undergo large deformations.…”

Section: Introductionmentioning

confidence: 99%

Modulating poisson’s ratio in flexible honeycombs by density and architecture gradations

Uddin,

Anni,

Youssef

et al. 2023

Eng. Res. Express

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Zero Poisson’s ratio structures are a new class of mechanical metamaterials wherein the absence of lateral deformations allows the structure to adapt and conform their geometries to desired shapes with minimal interventions. These structures have gained attention in large deformation applications where shape control is a key performance attribute, with examples including but not limited to shape morphing, soft robotics, and flexible electronics. The present study introduces an experimentally driven approach that leads to the design and development of (near) zero Poisson’s ratio structures with considerable load-bearing capacities through concurrent density and architecture gradations in hybrid honeycombs created from hexagonal and re-entrant cells. The strain-dependent Poisson’s ratios in hexagonal and re-entrant honeycombs with various cell wall thicknesses have been characterized experimentally. A mathematical approach is then proposed and utilized to create hybrid structures wherein the spatial distribution of different cell shapes and densities leads to the development of honeycombs with minimal lateral deformations under compressive strains as high as 0.7. Although not considered design criteria, the load-bearing and energy absorption capacities of the hybrid structures are shown to be comparable with those of uniform cell counterparts. Finally, the new hybrid structures indicate lesser degrees of instability (in the form of cell buckling and collapse) due to the self-constraining effects imposed internally by the adjacent cell rows in the structures.

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“…Young's modulus and Poisson's ratio of lattice structures have gained significant attention from the scientific community since these properties play a central role in a range of aforementioned mechanical applications. Recent studies have concluded that few geometries exhibit positive, negative, and zero Poisson's ratios, including extreme values and mixed mode (Olympio and Gandhi 2010, Attard and Grima 2011, Gong et al 2015, Chen et al 2018, Huang et al 2018, Wang 2019, Gaal et al 2020, Wang et al 2020. The main drawback of such lattices is that the elastic properties are a function of only geometric entities; hence upon manufacturing, it is not possible to change them, and due to this, the application of such lattices is limited to passive applications only.…”

Section: Introductionmentioning

confidence: 99%

Extreme on-demand contactless modulation of elastic properties in magnetostrictive lattices

Singh

Mukhopadhyay²,

Adhikari³

et al. 2022

Smart Mater. Struct.

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2D lattices are widely popular in micro-architected metamaterial design as they are easy to manufacture and provide lightweight multifunctional properties. The mechanical properties of such lattice structures are predominantly an intrinsic geometric function of the microstructural topology, which are generally referred to as passive metamaterials since there is no possibility to alter the properties after manufacturing if the application requirement changes. A few studies have been conducted recently to show that the active modulation of elastic properties is possible in piezoelectric hybrid lattice structures, wherein the major drawback is that complicated electrical circuits are required to be physically attached to the micro-beams. This paper proposes a novel hybrid lattice structure by incorporating magnetostrictive patches that allow contactless active modulation of Young’s modulus and Poisson’s ratio as per real-time demands. We have presented closed-form expressions of the elastic properties based on a bottom-up approach considering both axial and bending deformations at the unit cell level. The generic expressions can be used for different conﬁgurations (both unimorph or bimorph) and unit cell topologies under variable vertical or horizontal magnetic ﬁeld intensity. The study reveals that extreme on-demand contactless modulation including sign reversal of Young’s modulus and Poisson’s ratio (such as auxetic behavior in a structurally non-auxetic conﬁguration, or vice-versa) is achievable by controlling the magnetic ﬁeld remotely. Orders of diﬀerence in the magnitude of Young’s modulus can be realized actively in the metamaterial, which necessarily means that the same material can behave both like a soft polymer or a stiﬀ metal depending on the functional demands. The new class of active mechanical metamaterials proposed in this article will bring about a wide variety of design and application paradigms in the ﬁeld of functional materials and structures.

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New Zero Poisson's Ratio Structures

Cited by 18 publications

References 39 publications

Mechanical properties of 3D printed macroscopic models of schwarzites

Mechanical properties of 3D printed macroscopic models of schwarzites

Modulating poisson’s ratio in flexible honeycombs by density and architecture gradations

Extreme on-demand contactless modulation of elastic properties in magnetostrictive lattices

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