Effect of Cumulative stress in jet engine blade due to bird strike impact at high altitude

High stresses are induced in the blade of jet engine during flight condition, which are significant threat to the flight safety and have caused a number of accidents with human casualties. Bird strike, fatigue, creep, stagnation pressure and centrifugal force etc. are the factors that can cause damage to the blade. It is found from literature that centrifugal forces lead to rise in stresses at root section during flight condition. In such situation, bird strike has significant impact for damage of the blade. In this paper, simulation of jet engine blades at 810 rad/sec (7734 RPM) with bird strike velocity of 89.611 m/s (174.18 Knot) was considered. Initially, simulation of single blade was carried out using pressure and stress distribution at high altitude by fluid structural interaction. Effective stress versus time graph was plotted to understand the physical phenomenon through simulation so that required modification in single blade design can be thought to avoid accidents.