Abstract
Foreign object damage (FOD) arises due to ingestion of small hard particles like small pebbles and sand particles in gas turbine engines. The damage caused due to impact of foreign object on leading edge of rotating blade results in premature crack initiation and thereafter failure of the blade due to the time-varying tensile loads in running engine. Residual stresses which arise due to impact of foreign object play an important role in controlling the rate of crack initiation and propagation. Acceleration and retardation of crack growth depends on the characteristics of stress whether it is tensile or compressive in nature ahead of the incipient crack. In the present study impact of spherical projectile against leading edge of a typical fan blade test specimen was simulated using commercially available finite element solver LS-DYNA. Deformed geometry of crater in test specimen is compared with the experimental result. Variation of residual stress in three directions along depth has been studied to predict location of crack initiation for various impact speeds. Finally, stress concentration factor has been obtained for the evaluation of fatigue life of the test specimen.
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