Numerical simulation method and system for impact of large gravel on aero-engine blade

The invention relates to the technical field of aviation, in particular to a numerical simulation method and system for impact of large gravels on an aero-engine blade. The method comprises the steps that a deformation motion equation of the large gravels and an engine blade structure is established, discrete calculation is conducted through an FEM method, and an FEM equation is obtained; under the condition that the blade is impacted by large gravels, a contact algorithm between FEM and FEM is adopted, and an SDPH method is adopted for calculating a damage unit under the condition that damage occurs; establishing a geometric model of a large gravel and engine blade structure, and performing grid discretization to obtain a grid discretization model; performing simulation calculation on the FEM equation based on the grid discrete model; and carrying out data processing on the calculation result to obtain the damage morphology, the damage fragment movement condition and the like of the engine blade under the im