Turbine Blade Life Estimation
The blade life estimation is a multifaceted technology, involving free and forced vibration forces, that lead to the determination of steady and dynamic stresses at different critical speeds during the startup and shutdown procedures, as well as in the operational speed range. Propagation and unstable fracture are described with practical examples to estimate blade life.
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airfoil alternating stress amplitude analysis angle applied approach assumed bending blade called circulation component considered constant crack initiation critical curve cycles damage damping defined depending determine diagram direction discussed displacement distance distribution dynamic edge effect elastic element energy equation estimation excitation failure fatigue Fatigue Crack fatigue strength field flow forces fracture function gear geometry given gives HARMONIC lift linear load machine material mean stress mode natural frequencies notch Note number of cycles obtained occurs operating parameter plane plastic plate pressure properties range ratio reference region relation resonance root rotor rotor blades shape shown in Fig specimen speed stage steady steels strain strength stress intensity factor stress level structural subjected surface takes place theory unit unsteady vibration vortex wake yield zone