Negative Poisson’s ratios in metal nanoplates

Ho, Duc Tam; Park, Soon-Dong; Kwon, Soon‐Yong; Park, Kibog; Kim, Sung Youb

doi:10.1038/ncomms4255

Cited by 117 publications

(65 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to previous reports on negative Poisson's ratio in bulk auxetic materials with specifically engineered microstructures 13,35 or more recently in metal nanoplates because of surface and large deformation effects 20 , this behaviour is intrinsic for single-layer BP, and originates from its puckered structure, where the pucker can be regarded as a reentrant structure that is comprised of two coupled orthogonal hinges. As a result of this atomic structure, a negative Poisson's ratio is observed in the out-of-plane direction under uniaxial deformation in the direction parallel to the pucker, which becomes increasingly negative with both increased tension and compression.…”

contrasting

confidence: 70%

See 1 more Smart Citation

Negative poisson’s ratio in single-layer black phosphorus

2014

View full text Add to dashboard Cite

The Poisson's ratio is a fundamental mechanical property that relates the resulting lateral strain to applied axial strain. Although this value can theoretically be negative, it is positive for nearly all materials, though negative values have been observed in so-called auxetic structures. However, nearly all auxetic materials are bulk materials whose microstructure has been specifically engineered to generate a negative Poisson's ratio. Here we report using first-principles calculations the existence of a negative Poisson's ratio in a single-layer, two-dimensional material, black phosphorus. In contrast to engineered bulk auxetics, this behaviour is intrinsic for single-layer black phosphorus, and originates from its puckered structure, where the pucker can be regarded as a re-entrant structure that is comprised of two coupled orthogonal hinges. As a result of this atomic structure, a negative Poisson's ratio is observed in the out-of-plane direction under uniaxial deformation in the direction parallel to the pucker.

show abstract

contrasting

confidence: 70%

“…Furthermore, a negative Poisson's ratio was also found in auxetic origami sheets 18,19 . Ho et al recently reported that negative Poisson's ratios can be found in metal nanoplates because of a combination of free surface effects, and a phase transformation under uniaxial loading 20 .…”

mentioning

confidence: 99%

Negative poisson’s ratio in single-layer black phosphorus

2014

View full text Add to dashboard Cite

show abstract

“…The bifurcation of the FCC crystal structure is actually a phase transformation from tetragonal to orthorhombic. This phenomenon was observed computationally in previous reports2930. We confirmed that the phase transformation takes place at a critical strain of 0.088 at which the condition C 22 = C 23 meets for a Au (001) bulk material.…”

Section: Resultssupporting

confidence: 90%

Mechanical Failure Mode of Metal Nanowires: Global Deformation versus Local Deformation

Kwon

et al. 2015

Sci Rep

Self Cite

View full text Add to dashboard Cite

It is believed that the failure mode of metal nanowires under tensile loading is the result of the nucleation and propagation of dislocations. Such failure modes can be slip, partial slip or twinning and therefore they are regarded as local deformation. Here we provide numerical and theoretical evidences to show that global deformation is another predominant failure mode of nanowires under tensile loading. At the global deformation mode, nanowires fail with a large contraction along a lateral direction and a large expansion along the other lateral direction. In addition, there is a competition between global and local deformations. Nanowires loaded at low temperature exhibit global failure mode first and then local deformation follows later. We show that the global deformation originates from the intrinsic instability of the nanowires and that temperature is a main parameter that decides the global or local deformation as the failure mode of nanowires.

show abstract

“…The new metallic metamaterial exhibits auxetic behavior with almost constant negative values of Poisson’s ratio over a large strain range. This feature is very useful for practical applications in macroscopic metamaterials as well as in nanoscale structures [31,32]. A set of parametric studies using validated finite element (FE) simulation have been done to show the possibility of providing an effective control method to tune the mechanical properties of the 2D metallic auxetic metamaterial during the designing process.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Performance of Metallic Auxetic Metamaterials by Using Buckling and Plasticity

et al. 2016

View full text Add to dashboard Cite

Metallic auxetic metamaterials are of great potential to be used in many applications because of their superior mechanical performance to elastomer-based auxetic materials. Due to the limited knowledge on this new type of materials under large plastic deformation, the implementation of such materials in practical applications remains elusive. In contrast to the elastomer-based metamaterials, metallic ones possess new features as a result of the nonlinear deformation of their metallic microstructures under large deformation. The loss of auxetic behavior in metallic metamaterials led us to carry out a numerical and experimental study to investigate the mechanism of the observed phenomenon. A general approach was proposed to tune the performance of auxetic metallic metamaterials undergoing large plastic deformation using buckling behavior and the plasticity of base material. Both experiments and finite element simulations were used to verify the effectiveness of the developed approach. By employing this approach, a 2D auxetic metamaterial was derived from a regular square lattice. Then, by altering the initial geometry of microstructure with the desired buckling pattern, the metallic metamaterials exhibit auxetic behavior with tuneable mechanical properties. A systematic parametric study using the validated finite element models was conducted to reveal the novel features of metallic auxetic metamaterials undergoing large plastic deformation. The results of this study provide a useful guideline for the design of 2D metallic auxetic metamaterials for various applications.

show abstract

Negative Poisson’s ratios in metal nanoplates

Cited by 117 publications

References 65 publications

Negative poisson’s ratio in single-layer black phosphorus

Negative poisson’s ratio in single-layer black phosphorus

Mechanical Failure Mode of Metal Nanowires: Global Deformation versus Local Deformation

Tuning the Performance of Metallic Auxetic Metamaterials by Using Buckling and Plasticity

Contact Info

Product

Resources

About