Postbuckling analysis of externally pressured parabola, sinusoidal and cylindrical FG-GRCL panels using HSDT

In the present paper, by using the higher-order shear deformation theory and the strain-displacement relationships of large deflection, the postbuckling analysis of the functionally graded graphene-reinforced composite laminated (FG-GRCL) parabola, sinusoidal, and cylindrical externally pressured panels is presented in detail. The complex curvature functions of the parabola and sinusoidal panels are considered. The stress function is approximately determined and the Galerkin process is utilized to achieve the stability equations of nonlinear problem. The expression of pressure-deflection postbuckling behavior can be explicitly obtained. The influences of curvature types, material properties, and geometric characteristics on the postbuckling behavior of panels are also considered and investigated.