Transient Analysis of Graphene Reinforced FG-Porous Sandwich Plates Subjected to Underwater Blast

The present study performs the transient analysis of sandwich plates under the influence of underwater blast loading. The sandwich plate consists of a functionally graded (FG) porous core reinforced with graphene nanoplatelets (GnP), and two isotropic face sheets. To estimate the effective properties of the reinforced core, such as Young's modulus and mass density, the Halpin–Tsai model and rule of mixture are respectively utilized. The distribution of porosity and GnP employs continuous functions to accomplish gradation along the thickness direction. The governing equations based on the higher-order plate kinematic model are developed using a variational approach. The transient response in terms of nondimensional center displacement has been accessed by the finite element method along with Newmark’s time integration approach and the influence of various parameters such as porosity index, GnP’s weight fraction, type of porosity distribution, etc. is also explored.