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X선 회절과 유한요소법을 이용한 터빈 블레이드의 파괴기구에 관한 연구
김성웅,홍순혁,전형용,조석수,주원식,Kim, Seong-Ung,Hong, Sun-Hyeok,Jeon, Hyeong-Yong,Jo, Seok-Su,Ju, Won-Sik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
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.
이동우,홍순혁,조석수,주원식,Lee, Dong-U,Hong, Sun-Hyeok,Jo, Seok-Su,Ju, Won-Sik 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
Fatigue fracture in machine components is produced by surface micro-crack from stress concentration area such as notch and material defect. It is difficult to predict the remaining fatigue lift of mechanical components because the surface micro-crack on critical area initiates and grows with statistical distribution. Plane bending fatigue tests were carried out on the plain specimen of Al 2024-T3 and the initiation and growth behavior of surface micro cracks were observed. The statistical distribution of surface length of multiple micro cracks and their maximum length were investigated. The maximum surface crack length distributions were analyzed on the basis of the statistics of extremes in order to examine the prediction of remaining life.