Effect of Variation of Coefficient of Thermal Expansion on Thermomechanical Deformation of Cylindrical In-plane Auxetics Based on Re-Entrant Cells

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Abstract

The active development of mechanical metamaterials has recently led to the widespread use of auxetic structures in various applications with different loading conditions. This study examines the thermomechanical behavior of new cylindrical auxetic lattice structures by analyzing the relationship between their deformation characteristics and the coefficient of thermal expansion (CTE) of the material. Unlike traditional auxetic cylinders, the auxeticity plane of the developed models is perpendicular to the cylinder axis, which determines the specifics of their behavior. To understand the behavior of auxetic lattices under combined thermal and mechanical loads, computational experiments based on the finite element method (FEM) were carried out. Differentiations of both rectangular and cylindrical lattice structures were studied. The dependences of transverse strain on CTE were obtained and compared. The influence of CTE on the structural Poisson's ratio of rectangular auxetic lattices, which is a key parameter characterizing the auxetic behavior of the structure under thermomechanical loading, was evaluated. The possibility of modeling the mechanical behavior of auxetic cylinders using an orthotropic mechanical material model with effective properties was tested. The constants for specifying such a material model were obtained by modeling a numerical experiment on tension and shear of rectangular auxetic lattices along the coordinate axes. Using an example with artificial material properties, it was shown that the predominant deformation mechanism caused by the counteracting influence of mechanical and thermal loads can be controlled by choosing a material with a suitable CTE. This allows controlling the structure response to temperature change and mechanical load. Such results can be used to create cylindrical auxetic lattice structures subjected to mechanical and thermal deformations in applications requiring a controlled thermomechanical response.

Keywords

mechanical metamaterialscylindrical lattice structuresauxeticsnegative Poisson's ratiothermoelasticityre-entrant cell

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Article information

Published
26 December 2024
Issue date
26 December 2024
Issue
No. 6 (2024)
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