Fatigue Failure Analysis of Rotating Blade of Uniform Varying Cross Section with Damage at the Leading Edge
Madan Kumara M C1, Nandish. R. V2, Madhu E3
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Usually turbine blades are subjected to high centrifugal forces due to high rotational speed and also operated at highly critical environment conditions. So that the turbine blades are fail by fatigue or creep is common. High cycle fatigue (HCF) in gas turbine is one of the major problems experienced by the components of gas turbine. Since this high cycle fatigue can cause catastrophic failure this leads to damage of the blades and casing. Materials also play an important role in reducing the failure and increasing the life of the blade. Several researches are going on for the best material for gas turbines and blade materials among them nickel base single crystal is one. Nickel base single crystal material is used due to the effectiveness over polycrystalline blade materials. HCF caused by large resonance stresses is one of the main problems in turbine blade design. Fatigue analysis is done for the notched linearly varying rotating blade, the alternating stress, strain energy, stress intensity and life of the rotating blade is found. Influence of size and location of the damage on bladeÃ¢ÂÂs life is reported. Failure analysis of the rotating blade is carried to know the effect of the notch on the damaged blade and use it in critical conditions.