<p>To predict the mechanical behavior of the large-sized Abrasive Flap Wheel (AFW), this paper proposes an improved dynamic contact mechanics model of the AFW based on a modified Euler-Bernoulli equation of large deformation theory. Firstly, a nonlinear constitutive formula for a single flap is derived by nonlinear continuum mechanics. Then, a flap friction mechanics equation is established by decoupling the flap contact force into a uniform load, which use the load quantization method. Finally, the dynamic contact mechanics model of the AFW is built through solving the synergistic mechanism of the interaction force between the flaps. The dynamic contact force and contact area are analyzed by Abaqus and experiments. The results show that the average error of the predicted contact force is 13.6%, and the coincidence rate of the contact area is 87.54%. The AFW dimension and the compression amount are the primary factors governing hysteresis in the contact area, the mid-line of the contact area for the same size of AFW remains approximately stable. The proposed dynamic contact mechanics model can predict the contact mechanical behavior of the large-sized AFW effectively under multi-parameter coupled operating conditions.</p>