高炭素クロム軸受鋼の超広寿命域における回転曲げ疲労特性と破面形態

概要

論文の詳細を見る
In order to clarify the fatigue behavior in a wide life region, fatigue tests in the life region of N=0.5∿(10)^9 were performed for high strength steel of SUJ2,by means of a multi-type testing machine developed here. Thus, it was found that the S-N curve in the medium life region can be straightforwardly extrapolated to the low cycle region and connected to the static strength which provides the fatigue strength at N=0.5. It is another finding that S-N property of this steel in such a wide life region was successfully explained as duplex S-N characteristics corresponding to the surface induced fracture and interior inclusion induced fracture with a fish-eye, respectively. Characteristic fracture surface so-called fine granular area (FGA) was formed in the vicinity at the inclusion at the center of the fish-eye. Consequently, the long life fatigue fracture of this steel was caused through three different processes of (1) formation of FGA, (2) crack propagation to form the fish-eye and (3) rapid crack propagation to cause the catastrophic fracture.
社団法人日本機械学会の論文
2001-11-00