The effect of the hexachiral auxetic metamaterial structure on the thermal buckling response of sandwich piezoelectric smart nanoplates
Turan Das, Mehmet Tayyip Ozdemir, İsmail Esen
Abstract
This study investigates the thermal buckling behavior of smart piezoelectric sandwich nanoplates incorporating a hexagonal auxetic core layer. The analysis is based on higher-order shear deformation theory combined with nonlocal strain gradient elasticity. The equations of motion for the sandwich nanoplate were formulated using the hexagonal auxetic cell’s elastic mechanical properties and the surface layers’ piezoelectric properties. A formulation for general boundary conditions was introduced, and plate configurations with all edges either supported or clamped were assessed for comparison. To achieve accurate results, the mechanical properties of PZT-5H, including the thermal expansion coefficient of the auxetic structure, were modeled as dependent on temperature. The electroelastic material in the surface layers, PZT-5H, exhibits variable behavior based on the external electric potential. At the same time, the auxetic cell’s length and thickness significantly influence the thermal buckling characteristics of the sandwich nanoplate. The boundary conditions were also significant for plate thermal buckling. This study indicates that modifications to the core layer, surface layer electric potential, and boundary conditions are necessary for precise nanoelectromechanical systems to function effectively in a specified thermal environment.