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Cause of Fatigue Failure of the First Blade of 100-MW Gas Turbine
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 Title & Authors
Cause of Fatigue Failure of the First Blade of 100-MW Gas Turbine
Youn, Hee-Chul; Woo, Chang-Ki;
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 Abstract
Many failures have been reported in gas turbine facilities owing to repeated startups and prolonged use of the turbines. In this study, the causes and mechanism of fatigue failure in the first blade of a gas turbine were analyzed using a finite element method to calculate the centrifugal force, bending force, and a modal analysis based on the stress-stiffening effect and harmonic response under the operating conditions. The results show that, fatigue damage was caused by the resonance conditions encountered, in which the first natural frequency declined along with an increase in the metal temperature of the blade. The position of the expected fatigue damage was shown to match the actual position of the cracking at the root area of the blade, which was on the concave side. In addition, the equivalence fatigue stress was observed to approach the fatigue limit.
 Keywords
Fatigue failure;Finite element method;Gas turbine blade;Modal analysis;Harmonic response analysis;
 Language
Korean
 Cited by
 References
1.
Yoon, K. B., Ma, Y. W., Kim, Y. I., Cha, S. J., Kim, Y. J., 2005, Failure Analysis of Gas Turbine Compressor Blades, KSME, Spring Annual Meeting, 185-190.

2.
Yun, W. N., Kim, J. S., 2010, Investigation of High Cycle Fatigue Crack of the Gas Turbine Compressure Blade Using Finite Element Analysis, KSPE, 27:12 107-112.

3.
Song, G. W., Choi, W. S., Kim, W. J., Jung, N. G., 2013, Damage Analysis for Last-stage Blade of Low-pressure Turbine, KSME, 37:12 1153-1157.

4.
Lee, D. Y., Bae, Y. C., Kim, H. S., Lee, Y. R., Kim, D. Y., 2005, Vibration Analysis for the L-1 Stage Bladed-disk of a LP Steam Turbine, KSNVE, 20:1 29-35.

5.
Lucjan Witek., 2011, Numerical Stress And Initiation Analysis of the Compressor Blades after Foreign Object Damage Subjected to High-cycle Fatigue, Engineering Failure Analysis, 18:8 2111-2115. crossref(new window)

6.
Rao, 1990, Mechanical Vibrations, WILEY, Massachusetts, 138-175.

7.
John L. Shannon, Jr., 2001, Aerospace Structural Metals Handbook, PURDUE, Code 4217 103-125.