Auxetic mechanical metamaterials

Kolken, H.M.A.; Zadpoor, Amir A.

doi:10.1039/c6ra27333e

Cited by 538 publications

(382 citation statements)

References 133 publications

Supporting

Mentioning

330

Contrasting

Order By: Relevance

“…Typically, auxetic structures are anisotropic (i.e. different properties in different directions), undergoing different expansion rates depending on the axis stretched, however, this deformation is Stretchable Structures [6], [27], [32], [44], [46], [98], [111], [112], [141], [142], [151], [174], [175], [174], [176], [197], [212], [213], [216], [221], [223], [242], [246] iSkin [247], Stretchis [248], [128] [2], [3], [12], [22], [29], [30], [36], [57], [58], [59], [60], [78], [118], [149], [153], [181], [192], [201], [203], [204], [205], [206], [207], …”

Section: Auxetic Materialsmentioning

confidence: 99%

HCI meets Material Science

Qamar

Groh

Holman

et al. 2018

Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

View full text Add to dashboard Cite

Section: Auxetic Materialsmentioning

confidence: 99%

HCI meets Material Science

Qamar

Groh

Holman

et al. 2018

Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

View full text Add to dashboard Cite

“…All structures exhibited approximately 40-70% higher plateau stress in dynamic compression. 3) The effect of the strain rate sensitive filling on mechanical properties was evaluated. Gelatine filling had negligible effect on the plateau stress and absorbed energy in quasi-static compression.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5] Auxetic materials exhibit high specific energy absorption as they can have significant plateau region where a large amount of impact energy is dissipated. Moreover, the auxetic materials show increased resistance against penetration as they increase density under the impacting object.…”

Section: Introductionmentioning

confidence: 99%

Impact Testing of Polymer‐filled Auxetics Using Split Hopkinson Pressure Bar

et al. 2017

View full text Add to dashboard Cite

In this paper, impact testing of auxetic structures filled with strain rate sensitive material is presented. Two dimensional missing rib, 2D re-entrant honeycomb, and 3D re-entrant honeycomb lattices are investigated. Structures are divided into three groups according to type of filling: no filling, low expansion polyurethane foam, and ordnance gelatine. Samples from each group are tested under quasistatic loading and dynamic compression using Split Hopkinson Pressure Bar. Digital image correlation is used for assessment of in-plane displacement and strain fields. Ratios between quasistatic and dynamic results for plateau stresses and specific energy absorption in the plateau are calculated. It is found out that not only the manufactured structures, but also the wrought material exhibit strain rate dependent properties. Evaluation of influence of filling on mechanical properties shows that polyurethane increases specific absorbed energy by a factor of 1.05-1.4, whereas the effect of gelatine leads to increase of only 5-10%. Analysis of the Poisson's function reveals influence of filling on achievable (negative) values of Poisson's ratio, when compared to unfilled specimens. The results for the Poisson's function yielded apparently different values as the assessed minima of quasi-static Poisson's ratio in small deformations are constrained by a factor of 15.

show abstract

“…If one remember that for any anisotropic material Poisson's ratio should lie in the interval −1 < ν < 1/2, providing positive values of the other Cauchy elastic moduli, the current value ν m * = −1/3 is admissible and corresponds to a material of auxetic type, see [21], [4]. Theoretically at p → ∞ i.e.…”

Section: Size -Sensitive Dem Theory In Case IIImentioning

confidence: 99%

“…Special attention has been attracted to light alloys and other materials of metal or ceramic matrix [1] , [2] , [3]. Metal foams are materials of high porosity which possess specific combination of thermo-mechanical and physical properties, [4]. For their very low specific weights and thus high specific stiffnesses, they are able to absorb significant amount of deformation energy while guaranteeing other properties such as high fire and heat resistance, noise attenuation and shielding of electromagnetic devices.…”

Section: Introductionmentioning

confidence: 99%

Some considerations on modelling and homogenization of multiphase light alloys

Parashkevova

2018

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract. The modelling strategies aimed to access the thermo-mechanical behavior of the up-to date light and superlight alloys should take into account characteristics of each particular manufacturing technology. In the present study the light alloys and materials of high porosity are regarded as multiphase composites for which the content of embedded phases is predominant. A new modification of differential effective medium theory is presented accounting for inclusion's size effects. The applied approach is based on the size-sensitive dilute homogenization procedure with Cosserat material matrix. Numerical examples for elastic properties of a close cell foam materials with different Poisson's ratio are presented and discussed.

show abstract

Auxetic mechanical metamaterials

Abstract: We review the topology–property relationship and the spread of Young's modulus–Poisson's ratio duos in three main classes of auxetic metamaterials.

Cited by 538 publications

References 133 publications

HCI meets Material Science

HCI meets Material Science

Impact Testing of Polymer‐filled Auxetics Using Split Hopkinson Pressure Bar

Some considerations on modelling and homogenization of multiphase light alloys

Contact Info

Product

Resources

About