Anomalous elastic properties in stishovite

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8974-8980 ◽  
Author(s):  
K. M. Azzopardi ◽  
J. P. Brincat ◽  
J. N. Grima ◽  
Ruben Gatt
Keyword(s):  
Elastic Properties ◽  
Poisson’S Ratio ◽  
Ambient Pressure ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Negative Poisson's Ratio

Stishovite exhibits a negative Poisson's ratio when stressed in a range of directions in the (100), (010) and (001) planes under specific ambient pressure ranges. This may be explained through mechanisms involving rotations and distortions of the constituent octahedral.

scholarly journals Auxeticity enhancement due to size polydispersity in fcc crystals of hard-core repulsive Yukawa particles

Soft Matter ◽  
2017 ◽  
Vol 13 (43) ◽  
pp. 7916-7921 ◽  
Author(s):  
Paweł M. Pigłowski ◽  
Jakub W. Narojczyk ◽  
Krzysztof W. Wojciechowski ◽  
Konstantin V. Tretiakov
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Elastic Properties ◽  
Poisson’S Ratio ◽  
Hard Core ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Negative Poisson's Ratio ◽  
Size Of Particles

In this work we present results of Monte Carlo simulations of the elastic properties of Yukawa crystals with the polydispersity of size of particles. The results of our studies reveal an enhancement of negative Poisson's ratio (further referred to as auxeticity) due to size polydispersity in the system. We introduce a measure of auxeticity to estimate quantitatively an enhancement of auxetic properties which can be used to assess those changes in various systems.

Free vibration and sound insulation of functionally graded honeycomb sandwich plates

2021 ◽  
pp. 109963622110204
Author(s):  
Fenglian Li ◽  
Wenhao Yuan ◽  
Chuanzeng Zhang
Keyword(s):  
Free Vibration ◽  
Poisson’S Ratio ◽  
Functionally Graded ◽  
Poisson's Ratio ◽  
Dynamic Equations ◽  
Sound Insulation ◽  
Sandwich Plates ◽  
Negative Poisson’S Ratio ◽  
Honeycomb Sandwich ◽  
Negative Poisson's Ratio

Based on the hyperbolic tangent shear deformation theory, free vibration and sound insulation of two different types of functionally graded (FG) honeycomb sandwich plates with negative Poisson’s ratio are studied in this paper. Using Hamilton’s principle, the vibration and vibro-acoustic coupling dynamic equations for FG honeycomb sandwich plates with simply supported edges are established. By applying the Navier’s method and fluid–solid interface conditions, the derived governing dynamic equations are solved. The natural frequencies and the sound insulation of FG honeycomb sandwich plates obtained in this work are compared with the numerical results by the finite element simulation. It is proven that the theoretical models for the free vibration and the sound insulation are accurate and efficient. Moreover, FG sandwich plates with different honeycomb cores are investigated and compared. The corresponding results show that the FG honeycomb core with negative Poisson’s ratio can yield much lower frequencies. Then, the influences of various geometrical and material parameters on the vibration and sound insulation performance are systematically analyzed.

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