The air inhalation engine containing sand dust could collide with the compressor rotor blade at a higher relative speed and produce sand dust erosion

seriously affecting the flight safety of the aircraft. The model of TC4 plate with different shapes of sand dust was established by using the smoothed particle hydrodynamics (SPH) and finite element (FE) coupling

which could better adapt to the large deformation. The typical damage forms and laws of high speed erosion of the sand dust on the surface of the TC4 plate were studied. Results showed that the smaller sand dust angle meant the deeper impact crater and the greater damage. With the sand dust hitting the plate

the depth of the pit became smaller and smaller

showing the plastic hardening process of the flat surface; under the continuous impact of the sand dust

the impact angle was affected by the sand dust

the accumulation of the damage may be flushed off the plate by sand dust and repressed back to the crater.