窒化けい素の球-平板接触応力下におけるき裂進展挙動の破壊力学的考察 : 接触域中央部における微小表面き裂の進展挙動

概要

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Surface crack growth behavior of a Si_3N_4 plate from small pre-indentations located in the contact center was investigated under ball-on-plate contact. Near surface stresses under the spherical Hertzian contact were calculated by the Hanson's analytical solution. The crack growth behavior was discussed in terms of the calculated stresses and the stress intensity factors both under rolling contact and under sliding-including rolling contact. The cracks were observed to grow only in a direction perpendicular to the motion of the ball. The maximum value of K_I, K_<Imax>, was found to remain constant during the crack growth. The stress intensity factor ranges, ΔK_<II> and ΔK_<III>, on the other hand, increase with the increase in crack length both under rolling contact and under sliding-including-rolling contact. All the stress intensity factors were increased by the friction force. It was found that the crack growth is controlled by K_<Imax> combined with ΔK_<II> and ΔK_<III>. It was also found that the crack growth is promoted by the increased K_<Imax>, ΔK_<II> and ΔK_<III> by the friction force under sliding-including-rolling-contact.
一般社団法人日本機械学会の論文
1999-10-25