Study on the Influence of Foreign Object Impact Damage on Aircraft Engine Fan Blades
In order to study the different damage characteristics of the aero-engine fan blades caused by the impact of foreign objects,a finite element model was constructed based on the rate-dependent constitutive model and impact tests were carried out through a light air cannon system to evaluate the damage caused by the foreign objects at different impact positions,using the 304 steel balls of 6 mm,10 mm and 14 mm sizes as the bullets and a retired aero-engine blade as the target plate.The FOD damage area based on the impact response of the simulation model was compared with the experimental damage area,and high consistency was achieved between the two results in terms of the area size and shape.After that,the effects of impact position,angle and bullet size on the velocity change trend during the impact response were investigated using the constructed model.The results show that the impact resistance of the blade differs greatly at different positions and the bullet size plays a decisive role on the damage area.In addition,the change trend of the remaining velocity of the bullet is different when the damage pattern is different.
light air cannon testdamage modeFODimpact load simulation
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