Materials that push back

Grima, Joseph N.; Caruana‐Gauci, Roberto

doi:10.1038/nmat3364

Cited by 100 publications

(59 citation statements)

References 7 publications

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“…Due to their counter-intuitive properties, auxetic materials have been investigated as smart materials for potential applications including cushion materials [9], stents [10,11], pressure vessels [12], sensors [13], morphing airfoils [14,15], smart folding structures [16], smart metamaterials [17], aeroengine fan blades [18], and vibration dampers [19], to name a few. Arising from their unique properties, the mechanical performance of auxetic solids has been investigated [20][21][22][23][24][25][26][27][28][29][30][31][32][33], including their elastic stabilities [34][35][36]. Additionally, investigations in the dynamic behavior of auxetic solids and structures have also been performed [37][38][39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Buckling and Vibration of Circular Auxetic Plates

Lim

2014

Journal of Engineering Materials and Technology

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This paper evaluates the elastic stability and vibration characteristics of circuiar piates made from auxetic materials. By solving the general solutions for buckling and vibration of circular piates under various boundary conditions, the critical buckling ioad factors and fundamental frequencies of circular plates, within the scope of the first axisymmetric modes, were obtained for the entire range of Poisson's ratio for isotropic solids, i.e., from -1 to 0.5. Results for elastic stability reveal that as the Poisson's ratio of the plate becomes more negative, the criticai bucking ioad gradually reduces. In the case of vibration, the decrease in Poisson's ratio not only decreases the fundamental frequency, but the decrease becomes very rapid as the Poisson's ratio approaches its lower limit. For both buckling and vibration, the plate's Poisson's ratio has no effect if the edge is fully clamped. The results obtained herein suggest that auxetic materials can be employed for attaining static and dynamic properties which are not common in plates made from conventional materials. Based on the exact results, empiricai models were generated for design purposes so that both the critical buckling load factors and the frequency parameters can be conveniently obtained without calculating the Bessel functions.

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Section: Introductionmentioning

confidence: 99%

Buckling and Vibration of Circular Auxetic Plates

Lim

2014

Journal of Engineering Materials and Technology

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“…3D representations of the mechanical properties of Ag 2 C 2 O 4 as a function of the orientation of the applied strain were obtained using the ElAM software [92] and are shown in Figure 3. [1,11,19,93,94] Counterexamples to the general statement of positivity of the compressibility have been found for constrained systems. The compressibility is a mechanical property which measures the relative volume change of a material as a response to a pressure change.…”

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confidence: 97%

“…As may be noticed in Figure 3E and Table S6 The results obtained in previous works [1][2][3][4][5][6] show that the presence of large negative Poisson's ratios is frequently accompanied by the presence of the important negative linear compressibility phenomenon. [93,94] The volume of a material submitted to a hydrostatic (isotropic) pressure commonly does not increase, unless it is unstable. The compressibility must be strictly positive for space unconstrained solid materials which are thermodynamically and mechanically stable.…”

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confidence: 99%

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Colmenero

2019

Advcd Theory and Sims

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The crystal structure and mechanical properties of silver oxalate, Ag 2 C 2 O 4 , are determined using first-principles solid-state methods. The set of calculated mechanical properties include the bulk modulus and its pressure derivatives, the Young and shear moduli, the Poisson's Ratio and the ductility, hardness, and anisotropy indices. Silver oxalate is a highly anisotropic brittle material possessing a small bulk modulus of 9.6 GPa. It displays the negative Poisson's ratio (NPR) phenomenon, the value of the lowest NPR having a very large magnitude, −1.27. Besides, it exhibits the most extreme form of the negative linear compressibility (NLC) phenomenon found to date. Silver oxalate displays anisotropic NLC for external pressures in the range −0.1 to −2.4 GPa directed along the [010] crystallographic direction and isotropic NLC for isotropic pressures in the range −0.51 to 13.4 GPa. The lowest value of the negative compressibility, −831.9 ± 10 TPa −1 , is found for an isotropic pressure of −0.16 GPa. The absolute value of the computed lowest NLC is extremely large, about three times larger than the absolute value of the lowest NLC found so far. The NLC pressure range is also very wide, its width being more than two times the largest range found to date.

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“…the compressibility) for finite, and sufficiently high, pressure change will be always negative, due to the successive transitions. The concept of Nicolaou and Motter can be very useful to design special systems [13]. It should be mentioned here, that similar concept was proposed by Imre et al [14] using slow transition and the temporal violation of stability criterion.…”

Section: Introductionmentioning

confidence: 81%

Metamaterials with negative compressibility — a novel concept with a long history

Imre

2014

Materials Science-Poland

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Metamaterials with negative compressibility are a very promising group of novel materials with a wide variety of potential application. A recent model proposed construction of the structures with three-dimensional negative compressibility by utilizing successive destabilization of stable or metastable states and inducing phase transitions mimicking negative compressibility. Here, we would like to show that similar concept is used by the nature and a nice example of this kind of metamaterial can be seen even in a glass of water.

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Materials that push back

Cited by 100 publications

References 7 publications

Buckling and Vibration of Circular Auxetic Plates

Buckling and Vibration of Circular Auxetic Plates

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Metamaterials with negative compressibility — a novel concept with a long history

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