Negative Poisson’s ratio of two-dimensional hard cyclic tetramers

A two-dimensional system of hard, cyclic tetramers has been investigated by constant pressure Monte Carlo (MC) simulations with variable shape of the periodic box. The molecules (tetramers) are composed of four identical hard disks (atoms) with centers forming a square with sides equal to the diamet...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2009-08, Vol.355 (24), p.1435-1438
Main Author: Tretiakov, Konstantin V.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Mechanical properties
Modeling and simulation
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:A two-dimensional system of hard, cyclic tetramers has been investigated by constant pressure Monte Carlo (MC) simulations with variable shape of the periodic box. The molecules (tetramers) are composed of four identical hard disks (atoms) with centers forming a square with sides equal to the diameter of the disks. The elastic constants and the Poisson’s ratio are determined by the analysis of strain fluctuations and the reference state of the system. The singular behavior of the elastic constants is in agreement with free volume theory. It has been found that the hard cyclic tetramer system is auxetic – that is, the Poisson’s ratio of the tetramer system is negative.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2009.05.043