Transverse elastic shear of auxetic multi re-entrant honeycombs

Lira, Cristian; Innocenti, P.; Scarpa, Fabrizio

doi:10.1016/j.compstruct.2009.03.009

Cited by 95 publications

(67 citation statements)

References 19 publications

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“…Therefore, as compared to the non-auxetic materials, auxetic materials have very high shear modulus relative to bulk modulus. Shear properties of chiral lattice, [22] multi reentrant honeycombs, [53] and sinusoidal auxetic structure [54] have been investigated. It has been Fig.…”

Section: Shear Propertiesmentioning

confidence: 99%

Three Decades of Auxetics Research − Materials with Negative Poisson's Ratio: A Review

2016

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Material properties can be tailored through modification of their geometry or architecture. With this concept, a lot of smart materials, metamaterials, and smart structures have been developed. Auxetic materials and structures are a novel class of materials which exhibit an interesting property of negative Poisson's ratio. By virtue of the auxetic behavior, mechanical properties such as fracture toughness, indentation resistance, etc., can be improved. In order to exploit the interesting properties of auxetic materials, several potential applications of auxetic materials have been explored in medical, sports, automobile, defense, etc. Design and modeling of novel auxetic materials and structures is still on the way. Here, the article focuses upon the different aspects of auxetic materials and structures. A comprehensive updated review of auxetic materials, their types and properties, and applications has been presented. This paper also discusses the design and modeling approaches of auxetic structures.

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Section: Shear Propertiesmentioning

confidence: 99%

Three Decades of Auxetics Research − Materials with Negative Poisson's Ratio: A Review

2016

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“…The transverse shear properties have been simulated using a full-scale representation of the honeycomb panels under transverse shear [25,26] and, as further benchmark, RVEs with periodic boundary conditions to be used within a FE homogenisation procedure [23,25]. Three sets of full-scale FE models were prepared, each having a different type of element.…”

Section: Finite Element Modelsmentioning

confidence: 99%

Transverse shear modulus of SILICOMB cellular structures

Lira

Scarpa

Tai

et al. 2011

Composites Science and Technology

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a b s t r a c tThis work describes the transverse shear stiffness properties of a novel honeycomb with zero Poisson's ratio. The cellular configuration is simulated using a series of finite element models representing fullscale and representative unit cells of the honeycomb topology. The models are benchmarked against experimental results from pure shear and 3-point bending ASTM tests. The benchmarked models are used to perform a parametric study of the shear moduli (G 13 and G 23 ) against the geometry of the unit cell and the gauge thickness of the honeycomb panels. The shear stiffness maps obtained allow comparison of the SILICOMB configuration against classical centresymmetric and rectangular honeycomb topologies.

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“…[5][6][7][8] Deformation behaviour (both elastic and plastic) of such a porous construct is determined by concurrent effects of intrinsic behaviour of the material used for the scaffold production, cell topology and connectivity. To optimize its microstructure to suit the intended application and to achieve a stable negative Poisson's ratio up to high strains, a control over the pore structure is required.…”

Section: Introductionmentioning

confidence: 99%

Compressive properties of auxetic structures produced with direct 3D printing

Koudelka¹,

Jiroušek²,

Fíla³

et al. 2016

Mater. Tehnol.

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In the presented paper, three types of auxetic structures were produced with direct 3D printing and their compressive mechanical properties were tested. Samples were prepared from acrylic material suitable for high-resolution direct printing. Three different structures exhibiting in-plane and volumetric negative strain-dependent Poisson's ratio were selected for the analysis: two-dimensional missing-rib cut, two-dimensional inverted (re-entrant) honeycomb and three-dimensional inverted (re-entrant) honeycomb. The samples were subjected to quasi-static compression, from which stress-strain relationships were established. For a proper strain evaluation, digital-image correlation was applied to measure full-field displacements on the sample surfaces. From the displacement fields, true strain/true stress curves were derived for each sample. Furthermore, for each structure a three-dimensional FE model was developed using beam elements and subjected to identical loading conditions. Then, experimentally obtained stress-strain relationships were compared with numerically obtained results. For all the tested auxetic structures, the compressive behaviour was predicted well by the FE models. This demonstrates that parametric FE models can be used to tune the design parameters of the structures with a negative Poisson's ratio to optimize their overall properties. Keywords: auxetics, cellular materials, quasi-static testing, finite-element method V prispevku so predstavljene tri vrste struktur materialov z negativnim Poissonovim razmerjem, ki so proizvedene z neposrednim tridimenzionelnim tiskanjem. Preizku{ene so bile njihove mehanske lastnosti pri stiskanju. Vzorci so bili pripravljeni iz akrilnih materialov, ki so primerni za visoko resolucijsko neposredno tiskanje. Za analizo so bile izbrane tri razli~ne strukture, ki prikazujejo negativno odvisno Poissonovo razmerje v ravnini in v prostoru: dvodimenzionalni prerez z manjkajo~im rebrom, dvodimenzionalni obrnjeni (navznoter usmerjeni) vzorec satovja in tridimenzionalni obrnjeni (navznoter usmerjeni) vzorec satovja. Vzorci so bili izpostavljeni kvazi-stati~nem stiskanju pri katerem smo ugotavljali razmerja sileraztezek. Za primerno oceno sile obremenitve je bila uporabljena metoda korelacije digitalne slike in s tem izmerjeni odmiki na povr{ini vzorcev. Glede na te odmike so bile za vsak vzorec izpeljane dejanske obremenitvene krivulje. Nadalje je bil za vsako strukturo izdelan tridimenzionalni FE model, z uporabo matemati~nega modela podpornih struktur in izpostavljen identi~nim pogojem obremenitve. Nato smo primerjali eksperimentalno pridobljena razmerja med silo in obremenitvijo, z ra~unsko pridobljenimi rezultati. S pomo~jo primerjalnih diagramov sile in raztezka lahko ugotovimo, da FE modeli dobro napovedujejo obna{anje pri stiskanju vseh preizku{enih struktur z negativnim Poissonovim razmerjem. To prikazuje mo`nost uporabe parametri~nih FE modelov za prilagoditev zasnovnih parametrov struktur z negativnim Poissonovim razmerjem za optimiziranje njihovih splo{nih lastn...

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Transverse elastic shear of auxetic multi re-entrant honeycombs

Cited by 95 publications

References 19 publications

Three Decades of Auxetics Research − Materials with Negative Poisson's Ratio: A Review

Three Decades of Auxetics Research − Materials with Negative Poisson's Ratio: A Review

Transverse shear modulus of SILICOMB cellular structures

Compressive properties of auxetic structures produced with direct 3D printing

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