Effect of repeated annealing on the fatigue life in extremely low cycle fatigue

Hiroshi Hongo, Jun Komotori, Masao Shimizu

Research output: Contribution to journalArticle

Abstract

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 ≤ 102). 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.'

Original languageEnglish
Pages (from-to)2397-2401
Number of pages5
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume55
Issue number520
Publication statusPublished - 1989 Dec
Externally publishedYes

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Fatigue of materials
Annealing
Steel
Low carbon steel
Extrapolation
Plastic deformation
Microstructure

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Effect of repeated annealing on the fatigue life in extremely low cycle fatigue. / Hongo, Hiroshi; Komotori, Jun; Shimizu, Masao.

In: Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 55, No. 520, 12.1989, p. 2397-2401.

Research output: Contribution to journalArticle

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