窒化けい素の球-平板転がり接触下におけるはく離き裂進展挙動の破壊力学的考察

概要

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The subsurface crack growth that led to a flaking failure of Si_3N_4 was investigated under spherical Hertzian rolling contact. The subsurface crack was observed to grow in the two stages:firstly, the crack grew in a concentric circle;secondly, the crack extended in the direction parallel to the ball movement keeping with a constant width. The crack growth model, in which the effect of crack face friction was taken into account, was provided on the basis of the observation. A calculation was described of the variation of stress intensity factors at the crack tip of the effective area both in the perpendicular direction and in the parallel direction to the motion of the ball. The maximum values and the minimum values of stress intensity factor K_<II> were found to remain constant during the crack growth in the parallel direction, which was consistent with the observation that the subsurface main crack continued to grow in the parallel direction. In the perpendicular direction, the crack grew in out-of-phased Mixed mode with Modes II and III. For the crack-face frictional coefficient less than the threshold value of 0.3, the behavior of the maximum value of |K_<IIImin>| was found to be consistent with the experimental observation.
一般社団法人日本機械学会の論文
2000-04-25