潤滑油中における貫通き裂の応力拡大係数

概要

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A center crack specimen is assumed under plane strain condition to calculate the stress intensity factor. For the viscous lubricant filling in a crack, it is assumed that the pressure rise from the squeeze effect follows the Reynolds equation. In the same way as the infinitely long bearing and infinitely short bearing in the case of sliding bearings, the full Reynolds equation is approximated with a one-dimensional equation. As a result of the squeeze effect of the lubricant, the effective stress intensity factor is lower than the nominal one. In the case of the ratio of the specimen thickness and the crack length filled with lubricant where B/c is smaller than 1/2, the effective stress intensity factor K_γ can be calculated by using the infinitely short approximation. And, where B/c is greater than 2, the infinitely long approximation can be applied. In the region 1/2<B/c<2, the mean value of K_γ along the crack front may be estimated by the infinitely short approximation.
一般社団法人日本機械学会の論文
1986-11-25