Nonlinear low-velocity impact on axially-functionally-graded graphene-platelet-reinforced metal-foam cylindrical shells

This study investigates the nonlinear dynamic response of rotating cylindrical shells made of axiallyfunctionally- graded graphene-platelet reinforced metal-foam (AFG-GPLRMF) under low-velocity impact in thermal conditions. Three distinct distribution patterns of graphene platelets (GPLs) are examined, including both uniform and functionally graded distributions through the shell's thickness. Material properties of the GPL-reinforced composites are determined using a temperature-sensitive micromechanical model. The governing equations are formulated based on nonlinear Donnell's shell theory, incorporating von Kármán geometric nonlinearity. Through numerical simulations employing the Runge-Kutta method, parametric studies are conducted to evaluate the effects of various factors including: initial geometric defects, rotational speed, boundary constraints, GPL dispersion patterns, foam distribution characteristics, porosity parameter, GPL concentration, thermal variation, impactor dimensions and velocity, applied axial loads, and damping properties on the impact response characteristics.