Nonlinear vibration of double layered viscoelastic nanoplates based on nonlocal theory

This figure presents the influence of small scale coefficient on the nonlinear frequency ratio of the first nonlinear normal mode (NNM) for the double layered nanoplates with simply supported boundary condition. The figure shows that the frequency ratio increases with the augment of the nonlocal parameter for a given mode amplitude (a1/h). This fact reveals that with the increase of the nonlocal coefficient the nonlinearity for the first NNM is enhanced.