Effect of Functionally Graded Carbon Nanotube Reinforcement on the Dynamic Response of Composite Beams Subjected to a Moving Charge

Abstract

PurposeThis article examines the forced vibrations of composite beams that have been reinforced with single-walled carbon nanotubes (SWCNTs) and subjected to a moving charge without considering the effect of mass inertia.MethodsThis study investigates three different beams, namely uniform distribution carbon nanotubes (UD-CNT), functionally graded Lambda distribution carbon nanotubes (FG Lambda-CNT), and functionally graded X distribution carbon nanotubes (FGX-CNT). The SWCNTs exhibit length alignment along the axial direction, while their volume distributions are observed in the thickness direction. The motion equations of beams are derived using Hamilton's principle and mass interaction forces based on a sinusoidal third-order shear deformation theory (TSDT). These equations are then converted into a single equation set and solved using Navier's method.ResultsThis study presents comprehensive findings on the effects of total volume fraction and distribution types of carbon nanotubes (CNTs) on the forced vibration of a composite beam caused by a moving charge at different mass velocities. The FGX-CNT distribution of the beam has demonstrated increased resistance to the dynamic impact of live load.ConclusionThe study's findings will aid in the development of micro-sensors that carry moving charges.