疲労き裂伝播開始条件に及ぼす応力比と応力履歴の影響

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In the present paper, authors have performed an experimental study on fatigue crack propagation at threshold level to clear the effects of Stress ratio and stress history upon the threshold stress-intensity factor (K-threshold). Fatigue tests were carried out under load controlled three-point bending condition using side notch type specimens. The K-threshold values under the different stress ratio conditions are obtained by load decreasing test method which can eliminate the influences of loading history. The results show that the K-threshold range decreases with the increasing of Stress ratio. An empirical equation which represents the relation between K-threshold range and Stress ratio is proposed based on the comparison among present results and other researchers' data. The K-threshold values after crack propagation at constant stress range are obtained by load increasing test method under various stress ratio conditions. It is found that the K-threshold value after stress history increases with the increasing of stress range at stress history process. And this tendency is well characterized by using maximum stress-intensity factor at stress history process and at threshold. A simplified equation for the prediction of K-threshold value after given stress history of constant stress range is derived from the present study. Estimated K-threshold values by proposed equation show fairly good agreements not only with present results but also with other researchers' data.
社団法人日本船舶海洋工学会の論文

疲労き裂伝播開始条件に及ぼす応力比と応力履歴の影響

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