20412 レール頭部における三次元き裂の応力拡大係数の解析とき裂進展の評価(OS8 進化を続ける転がり機械要素(2),オーガナイズドセッション)

概要

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In rolling contact fatigue (RCF) of rails, surface cracks form at a shallow angle inclined to the traveling and horizontal directions, and grow primarily in the traveling direction underneath the rail surface, which are generally called 'squats'. This paper attempted to analyze the cracks through finite element method (FEM) and linear elastic fracture mechanics (LEFM). The analysis incorporated three-dimensional FEM model of rail and the squat-type crack, which was common in tracks with high-speed traffic. The history of mixed Mode I, II and III stress intensity factors (SIFs) during rolling of a wheel was calculated from the model. Fully reversed Mode II and III SIFs were obtained, while Mode I range was small when the fluid pressurized action was not taken into account.
2010-03-09