Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Failure Mechanism of Turbine Blade using X-Ray Diffraction and FEM

X선 회절과 유한요소법을 이용한 터빈 블레이드의 파괴기구에 관한 연구

  • 김성웅 (동아대학교 대학원 기계공학과) ;
  • 홍순혁 (부경대학교 CAD/CAM Lab.) ;
  • 전형용 (한국철도차량(주) 중앙연구소 기초연구팀) ;
  • 조석수 (삼척대학교 기계·정밀기계·자동차공학부) ;
  • 주원식
  • Published : 2002.08.01
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Abstract

The failure analysis on fractured parts is divided into the qualitative method by naked eyes and metallurgical microscope etc. and the quantitative method by SEM and X-ray diffraction etc. X-ray fractography can be applied to contaminated surface as well as clean surface and gain the plastic deformation and the residual stress near the fractured surface. Turbine blade is subject to cyclic bending force by steam pressure and suffers fatigue damage according to the increasing operating time. Therefore, to clean up the fracture mechanism of torsion-mounted blade in nuclear plant, the fatigue and the X-ray diffraction test was performed on the 12%Cr steel fur turbine blade and the fractured parts. The correlation of X-ray parameter and fracture mechanics parameter was determined, and then the load applied to actual broken turbine blade was predicted. Failure analysis was performed by contact stress analysis and Goodman diagram of torsion-mounted blade.

Keywords

References

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