Auxetic behavior from rotating triangles

@article{Grima2006AuxeticBF,
  title={Auxetic behavior from rotating triangles},
  author={Joseph N. Grima and Kenneth E. Evans},
  journal={Journal of Materials Science},
  year={2006},
  volume={41},
  pages={3193-3196}
}
Materials with a negative Poisson’s ratio (auxetic) exhibit the very unusual property of becoming wider when stretched and narrower when compressed [1]. This property gives a material several beneficial effects such as increased shear stiffness, increased plane strain fracture toughness, increased indentation resistance and improved acoustic damping properties [1–5]. In recent years several auxetics have been manufactured by modifying the microstructure of existing materials, including foams [2… 

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References

SHOWING 1-10 OF 21 REFERENCES

Review on auxetic materials

Although a negative Poisson's ratio (that is, a lateral extension in response to stretching) is not forbidden by thermodynamics, for almost all common materials the Poisson's ratio is positive. In

Crystalline networks with unusual predicted mechanical and thermal properties

MOST materials shrink laterally and become less dense when stretched. Materials that both expand laterally (that is, have negative Poisson's ratio) and densify when stretched are of interest both

Dynamic properties of high structural integrity auxetic open cell foam

This paper illustrates various dynamic characteristics of open cell compliant polyurethane foam with auxetic (negative Poisson's ratio) behaviour. The foam is obtained from off-the-shelf open cell

Negative Poisson's ratios as a common feature of cubic metals

Poisson's ratio is, for specified directions, the ratio of a lateral contraction to the longitudinal extension during the stretching of a material. Although a negative Poisson's ratio (that is, a

Microporous materials with negative Poisson's ratios. I. Microstructure and mechanical properties

A microporous, anisotropic form of expanded polytetrafluoroethylene has been found to have a large negative major Poisson's ratio. The value of Poisson's ratio varies with tensile strain and can

Elasticity of α-Cristobalite: A Silicon Dioxide with a Negative Poisson's Ratio

Laser Brillouin spectroscopy was used to determine the adiabatic single-crystal elastic stiffness coefficients of silicon dioxide (SiO2) in the α-cristobalite structure. This SiO2 polymorph, unlike

Molecular origin of auxetic behavior in tetrahedral framework silicates.

The concurrent model is in excellent agreement with experiment and explains the dichotomy between negative and positive nu(31) values in alpha-cristobalite and alpha-quartz, respectively.

Do Zeolites Have Negative Poisson's Ratios?

Consequently, the size of the resulting nanoparticles matches the dimension of the nanometer-sized cavities inside these swollen domains. The possibility of controlling the growth of the metal

Foam Structures with a Negative Poisson's Ratio

A novel foam structure is presented, which exhibits a negative Poisson's ratio. Such a material expands laterally when stretched, in contrast to ordinary materials.