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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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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.
Fatigue failure;Finite element method;Gas turbine blade;Modal analysis;Harmonic response analysis;
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균열을 내재한 저압터빈 최종단 블레이드의 진동 특성 및 파괴 임계균열길이 해석,윤희철;우창기;이장규;

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