Dynamic instability analysis of sandwich plates with auxetic honeycomb core and three-phase hybrid composite layers stiffened by curved stiffeners using isogeometric analysis

This article investigates the dynamic instability of a stiffened sandwich plate with an auxetic honeycomb core and three-phase hybrid composite (PMMA/GPL/Carbon fiber) layers. To achieve this objective, the governing equations related to the plate and stiffener are expanded using the first -order shear deformation theory (FSDT). The isogeometric analysis (IGA) method is employed to solve these governing equations. The results are compared with data from previously published articles to validate their accuracy and demonstrate the high precision of the isogeometric analysis method for analyzing stiffened sandwich plates. In this study, the dynamic instability of a stiffened sandwich plate is studied by creating a non-conformed interface between the stiffener and the plate surface. Furthermore, this study investigates how stiffeners, geometric and mechanical characteristics of the auxetic honeycomb core, and three-phase hybrid composite layers simultaneously affect the dynamic instability of a sandwich plate.