Design of double negativity elastic metamaterial

Su, Yi; Sun, C. T.

doi:10.1080/19475411.2015.1029604

Cited by 14 publications

(3 citation statements)

References 24 publications

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“…Such negative modulus materials were reported in literatures for solid composites [28][29][30][31] and metamaterials. [32][33][34] Based on the above discussion, the results from MD simulation match with the reciprocal equation for usual orthotropic materials which implies that this equation is still valid for the current material system.…”

Section: Resultsmentioning

confidence: 77%

Tunable Positive/Negative Young's Modulus in Graphene‐Based Metamaterials

Lin

Xiang

Shen

2021

Advcd Theory and Sims

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Mechanical metamaterials exhibit unusual mechanical properties that originate from their topological design. Origami graphene may provide a platform for constructing novel carbon nanostructures. In the current study, a novel composite material that incorporates aligned graphene with localized origami shapes into the copper matrix is designed. Unlike many auxetic materials that have void phase, the proposed layer‐by‐layer assembled composite material appears to be solid in the microscopic scale. Based on the molecular dynamics (MD) simulations, it is observed that depending on the origami shapes, the in‐plane Poisson's ratio of origami graphene reinforced copper (100) composites can be tuned from positive to negative and, more importantly, it is discovered that the Young's modulus of the graphene/Cu composites can also be tuned from positive to negative in certain in‐plane directions.

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Section: Resultsmentioning

confidence: 77%

Tunable Positive/Negative Young's Modulus in Graphene‐Based Metamaterials

Lin

Xiang

Shen

2021

Advcd Theory and Sims

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“…The negative material stiffness, namely the bulk modulus (inverse compressibility) of a constrained solid elastic body of any dimension, is stable within the elasticity principle [18]. Double-negative metamaterials can be obtained by combining negative effective mass and negative effective modulus [26]. Similar to electromagnetic (EM) metamaterials, the integration of resonant structures into blocks of an elastic metamaterial achieves negative successful elastic parameters [27].…”

Section: Stablementioning

confidence: 99%

Molecular Dynamics Study of Anti-Wear Erosion and Corrosion Protection of PTFE/Al2O3 (010) Coating Composite in Water Hydraulic Valves

Mlela

Wang

2020

Coatings

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Cavitation erosion and corrosion commonly occur on the surface of fluid dynamic system components, mostly water hydraulic valves, causing the failure of metal parts. Coating of polytetrafluoroethylene (PTFE) on Al2O3 (010) was created by varying the chain length of polytetrafluoroethylene. Calculations were conducted by molecular dynamic (MD) simulations. This study shows that the K10 and K20 chain lengths’ mechanical properties possess negative elastic, shear, and bulk modulus values. We have found that the K10 chain length composition shows the high results of binding energy and negative bulk modulus of 6267.16 kJ/mol and −3709.54 GPa, respectively. The K10 chain length was observed to possess a higher cohesive energy density (CED) and solubility parameter of (6.885 ± 0.00076) × 109 J/m3 and (82.974 ± 0.005) (J/cm3)0.5, respectively. It was also found that increasing the chain length contributes to decreasing the binding energy and solubility parameter of PTFE/Al2O3 (010) composition. These results are vital for overcoming the repetitive regime of high compressive strength of water microjets on the valves’ material surface. Improved values of the cohesive energy density and solubility parameters imply the water’s superior hydrophobic effect.

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“…These periodically arranged LLR systems can attenuate longitudinal wave propagation by transforming the longitudinal stimulus to its perpendicular direction. In 2015, their group extended the lumped structure to a continuum structure made of beams [18]. It is however, still limited to longitudinal wave control.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation and power flow in an acoustic metamaterial plate with lateral local resonance attachment

Wang

Sheng

Ding³

et al. 2018

J. Phys. D: Appl. Phys.

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This paper presents analysis on wave propagation and power flow in an acoustic metamaterial plate with lateral local resonance. The metamaterial is designed to have lateral local resonance systems attached to a homogeneous plate. Relevant theoretical analysis, numerical modelling and application prospect are presented. Results show that the metamaterial has two complete band gaps for flexural wave absorption and vibration attenuation. Damping can smooth and lower the metamaterial’s frequency responses in high frequency ranges at the expense of the band gap effect, and as an important factor to calculate the power flow is thoroughly investigated. Moreover, the effective mass density becomes negative and unbounded at specific frequencies. Simultaneously, power flow within band gaps are dramatically blocked from the power flow contour and power flow maps. Results from finite element modelling and power flow analysis reveal the working mechanism of the flexural wave attenuation and power flow blocked within the band gaps, where part of the flexural vibration is absorbed by the vertical resonator and the rest is transformed through four-link-mechanisms to the lateral resonators that oscillate and generate inertial forces indirectly to counterbalance the shear forces induced by the vibrational plate. The power flow is stored in the vertical and lateral local resonance, as well as in the connected plate.

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Design of double negativity elastic metamaterial

Cited by 14 publications

References 24 publications

Tunable Positive/Negative Young's Modulus in Graphene‐Based Metamaterials

Tunable Positive/Negative Young's Modulus in Graphene‐Based Metamaterials

Molecular Dynamics Study of Anti-Wear Erosion and Corrosion Protection of PTFE/Al2O3 (010) Coating Composite in Water Hydraulic Valves

Wave propagation and power flow in an acoustic metamaterial plate with lateral local resonance attachment

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