窒化けい素の球-平板接触応力下における接触境界近傍領域の微小表面き裂進展挙動

概要

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Surface crack growth behavior of a Si_3N_4 plate from small pre-indentations was investigated under ball-on-plant contact. The cracks located in the border of contact area were observed, where the cracks were little affected by the fluid pressure by "hydraulic pressure mechanisms". Near surface contact stresses under the spherical Hertzian contact were calculated. The crack growth behavior was discussed in terms of the calculated contact stresses and the stress intensity factors under sliding-including-rolling contact and under rolling contact. The cracks were observed to grow in the parallel direction and in the perpendicular direction to the motion of the ball, which indicates that the cracks are predominantly propagated by the contact stresses in the border. The stress intensity factor ranges, ΔK_II, ΔK_III, and the maximum value of K_I, K_Imax increase with the increase in crack length both under rolling contact and under sliding-including-rolling contact. It was found that the crack growth is controlled by ΔK_II combined with K_Imax and ΔK_III. It was also found that the crack growth is promoted by K_II combined with K_I in the parallel direction.
一般社団法人日本機械学会の論文
2000-05-25