In order to analyze the characteristics difference of foreign object damage caused by different metal hard materials on the aero-engine fan blades

beads made of steel

copper

aluminum and lead were regarded as foreign objects

the intake edges of real blades were impacted at two angles and different speeds

and the dynamic damage process was simulated by numerical methods.The experiment results showed that when the steel and copper beads impacted

the blade damage morphology could be divided into pits

tears and gaps

when the tearing appearance occurred

the small angle impact required higher speed compared with large angle impact. Furthermore

copper beads impact required higher speed compared with steel beads impact; aluminum beads and lead beads had large deformation when they were impacted

which only caused extrusion deformation of the blade. The simulation results showed that

when the impact energy was 22 J

there were two significant peaks of contact force in the process of tear damage caused by copper beads and steel beads

accompanied by the phenomenon of “kinetic energy recovery”; more kinetic energy of the copper bead was transformed into the blade and its own strain energy

so its penetration ability to the blade was not as good as that of the steel bead; the aluminum bead had the highest impact force

and the ratio of its kinetic energy to its own strain energy was the highest; the impact force peak of the lead bead was not obvious

and most of its kinetic energy was converted into heat consumed by friction.