FATIGUE LIFE ESTIMATION OF TURBOMACHINERY BLADES

摘要

After a brief review of development of rotors and the need to perform life estimation of the modern machinery, this paper presents a comprehensive method of life estimation of advanced high speed rotating machinery concerning stress based, strain based and linear elastic fracture mechanics methods. A novel feature presented here includes a complete analytical procedure to determine a nonlinear damping model for material and friction effects without depending on costly experimental procedures. Using this nonlinear damping model, a method to determine resonant stress and stress distribution around the critical is also illustrated. The effect of acceleration on the blade resonant stress is included in the cumulative damage while crossing a critical speed. To help the designers speed up the simulation and assess life, a process simulation of all the above effects are integrated into one single platform and the way it works is illustrated.