The coupled dynamics of a double beam system connected via an elastic layer is
investigated. The double beam is reinforced with bidirectional functionally graded carbon
nanotubes. Independent transverse and axial motions for each beam, as well as their
couplings, are considered in the model. The two interconnected beams are functionally
graded with patterns of UD, FGV, FGO, and FGX in the thickness direction, and a power-law
function in the longitudinal direction, and a power-law function in both the thickness and …