Nonlinear thermo-mechanical buckling and postbuckling behavior of FG-GPLRC panels with auxetic core and piezoelectric layers

In this paper, the nonlinear large deflection and higher-order shear deformation shell theories are combined to analyze the nonlinear thermo-mechanical buckling and postbuckling behaviors of functionally graded graphene platelet reinforced composite (FG-GPLRC) complexly curved panels with porous core and piezoelectric layers. Different distributions of graphene platelet (GPL), and different types of curvatures, including parabola, sinusoidal, and cylindrical curvatures, are investigated. Four types of simply supported boundary conditions are taken into account, and the potential energy expression is formulated. The nonlinear three-parameter elastic foundation model and Ritz energy method are used to obtain the critical buckling and postbuckling responses of panels. Numerical examples present different effects of the GPL distribution and volume fraction, curvature of panels, piezoelectric layers, foundation, and uniformly distributed temperature change on the nonlinear buckling responses of the considered panels.