Effect of Repeated Annealing on the Fatigue Life in Extremely Low Cycle Fatigue

Hiroshi Hongo, Jun Komotori, Masao Shimizu

研究成果: Article査読

抄録

The effect of repeated annealing during the course of a fatigue test on a fatigue behavior was studied on two kinds of low-carbon steel having fine-and coarse-grained microstructures, paying special attention to the relationship between the fracture modes and fatigue life in the extremely low-cycle fatigue regime (Nf≦l02). Results show that in a coarse-grained steel, (i) repeated annealing has the beneficial effect of repairing the damage inside the material; (ii) in this case, final fracture occurs in a surface fracture mode instead of internal fracture mode which normally appears in extremely low cycle fatigue regime. Such a change occurs after strain cycles obtained by the extrapolation from the fatigue life data for a surface fracture mode at low plastic strain range; and (iii) these findings can be clearly explained by the concept of “the competition of two failure limit lines which correspond to each fracture mode”.

本文言語English
ページ(範囲)2397-2401
ページ数5
ジャーナルTransactions of the Japan Society of Mechanical Engineers Series A
55
520
DOI
出版ステータスPublished - 1989
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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