Suppressing Chatter Behavior of the Nonlinear Damping in Composite Boring Bar

The nonlinear dynamical behavior of rotating composite boring bar containing carbon nanomaterials in cutting system was investigated. Considering the internal damping of the reinforced composite material and the external damping of the cutting process, combining the kinetic energy, strain energy, dissipation energy of the composite boring bar and the process damping force and regenerative cutting force, nonlinear dynamics model of the boring system of the rotating composite boring bar is presented based on the extended Hamilton’s principle. The analytical solution of the steady-state response of the boring system was then obtained by Galerkin approximation and perturbation method of multiple time scale. The feasibility and correctness of the proposed boring dynamic model with carbon nanomaterial embedded reinforced composite boring bar is verified. The results obtained indicate that the GNPs-filled has a significantly effect on the nonlinear dynamic behavior of the boring process. The amplitude of response and unstable region at low spin speed are reduced as the nonlinear damping from the reinforced composite is raised.