Aircraft engine fan blades and Steam turbine LP stage blades are the longest blades in a given turbomachine and are prone for fatigue failures. The alternating stresses induced are very high due to foreign objects ingestion in aircraft engines and off-design operations of steam turbines causing high stresses in the last stage blades. Damping is the main unknown factor in life estimation of such blades and this paper describes a procedure of analytical determination of damping due to hysteresis, macro and microslip damping mechanisms and determination of resonant stresses leading to accurate life estimation.
Volume Subject Area:
Dynamics, Vibration and Control
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