We sometimes experience fretting fatigue fracture of industrial machines after a long period of operation. It has been a question whether the fatigue limit really exists in fretting fatigue or not. In this report, fretting fatigue tests in giga-cycle region up to 109 cycles were performed. There was a knee point in the S-N curve and it was verified that no fracture was observed up to 109 cycles. An electro-potential drop technique was developed to detect the micro-crack growth behavior of the fretting fatigue. It was shown that the micro-crack generated by fretting ceased to grow and became a non-propagating crack at fatigue limit. These results indicated that the fatigue limit can exist also in fretting fatigue. The infinite endurance limit can be achieved by the mechanism that initiated fretting fatigue cracks become non-propagating cracks.
|ジャーナル||Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|出版物ステータス||出版済み - 8 2004|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering