This paper presents a new experimental system to study the L-HCCF of an actual turbine disk mortise teeth at elevated temperature, using an actual disk as experimental component. This system ingeniously achieves combined loading (simulating low cycle radial centrifugal force and high cycle crosswise vibration of blade), high-frequency induction local heating (550°C constant temperature), control of high cycle vibrating frequency and amplitude, and crack real-time detection. The experimental result is identical with the practical flight failure. This method can be easily popularized to study the L-HCCF of many components.

Issue Section:
Gas Turbines: Structures and Dynamics
Topics:
Disks, Fatigue, Temperature, Turbines, Cycles, Blades, Centrifugal force, Electromagnetic induction, Failure, Flight, Fracture (Materials), Heating, Vibration
1.
Hudak, and Bucci, 1981, Fatigue Crack Growth Measurement and Data Analysis, ASTM STP 738, PP103-119.
2.
Powell, B. E., et al., 1982, “The Influence of Minor Cycles on Low Cycle Fatigue Crack Propagation,” Int. J. Fatigue, Vol. 4, No. 1.
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Copyright © 1997
 by The American Society of Mechanical Engineers
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