In this paper, the free vibration behaviors of the functionally graded (FG) coated and undercoated
substrate structures are studied by a meshfree boundary–domain integral equation method. Based on
the two-dimensional elasticity theory, the boundary–domain integral equations for each single layer of
these coating–substrate structures are derived initially by using elastostatic fundamental solutions.
Employ the radial integration method to transform the domain integrals into boundary integrals and
achieve a meshfree scheme. By applying the multi-region boundary element method, obtain the
generalized eigenvalue system of the whole structure, which involves system matrices with boundary
integrals only and the complete solutions for natural frequency and vibration modes are rigidly resolved.
A comparative study of FG versus homogeneous coating is conducted. The influences of material
composition, material gradient, coating thickness ratio, substrate structure aspect ratio and the
boundary conditions on the natural frequencies of the FG coated and undercoated substrate structure
are evaluated and discussed.