ギガサイクル領域のフレッティング疲労限度とき裂の停留について(鉄鋼材料,<特集>ギガサイクル疲労)

概要

論文の詳細を見る
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 10^9 cycles were performed. There was a knee point in the S-N curve and it was verified that no fracture was observed up to 10^9 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.
2004-08-25