Proceedings of the KSME Conference (대한기계학회:학술대회논문집)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Fracture Mechanism of Torsion-Mounted Type Turbine Blade

비틀림 마운트형 터빈 블레이드의 파괴기구에 관한 연구

  • 홍순혁 (동아대학교 대학원 기계공학과) ;
  • 이동우 (동아대학교 대학원 기계공학과) ;
  • 장득열 (삼척대학교 기계.정밀기계.자동차공학부) ;
  • 조석수 (삼척대학교 기계.정밀기계.자동차공학부) ;
  • 주원식 (동아대학교 기계.산업시스템공학과)
  • Published : 2001.06.27
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Abstract

Turbine blade is subject to torsional load by torsion-mount, centrifugal load by rotation of rotor and repeated bending load by steam pressure. Turbine with partially cracked blade has normal working condition at initial repair time but vibratory working condition at middle repair time due to crack growth. Finite element analysis on turbine blade indicates that repeated bending load out of all loads is the most important factor on fatigue strength of turbine blade. Therefore, this study shows root mean square roughness has linear relation with stress intensity factor range in 12% Cr steel and can predict loading condition of fractured turbine blade.

Keywords