Abstract
This paper presents a study of new two-dimensional composite structures with respect to their thermomechanical properties. The investigated structures are based on very well-known auxetic geometries—i.e., the anti-tetrachiral and re-entrant honeycomb—modified by additional linking elements, material which is highly sensitive to changes of temperature. The study shows that temperature can be used as a control parameter to tune the value of the effective Poisson’s ratio, which allows, in turn, changing its value from positive to negative, according to the temperature applied. The study shows that such thermoauxetic behavior applies both to composites with voids and those completely filled with material.
Highlights
It is very well known that mechanical properties of materials depend on temperature
The two-dimensional model was considered with the assumption of plane stress approximation
The results obtained for auxetic geometry with linking material were parametrized in order to Finite element analysis was performed with the use of Comsol Multiphysics software
Summary
It is very well known that mechanical properties of materials depend on temperature. Temperature change can drastically influence the values of materials’ elastic properties, i.e., the Young’s modulus and the Poisson’s ratio [1,2]. This is interesting in the case of auxetic materials. The negative Poisson’s ratio characterizing auxetic materials has been extensively studied for more than thirty years. Since first works by Gibson [3], Lakes [4], Wojciechowski [5] and Evans [6], it has been discovered that auxeticity can be obtained from specific geometry of material microstructure and, many such geometries have been proposed. Some of the most popular geometries are: chiral and antichiral [7,8,9], re-entrant [10,11], double arrowhead [12,13] and rotating polygons [14]
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