The Rotary Bending Fatigue of a Eutectoid Steel (1st Report, Effects of Surface Finish and Defects on Fatigue Limit)

Shoji Harada, Shin Ichi Nishida, Tatsuo Endo, Kenjiro Suehiro, Yoshihiro Fukushima, Hiroyuki Yamaguchi

Research output: Contribution to journalArticle

2 Citations (Scopus)


To examine the effects of the surface finish and defects on fatigue limit, specimens differently finished, i.e., sand paper(Grade #600, #80) finish and electrolytic polish, were prepared. Moreover, to simulate surface defects, a small artificial hole of which diameter is varied from 40 to 200 μm is introduced on the specimen surface. Both as-received and annealed specimens were applied so as to extract the effect of the work-hardened surface layer on the fatigue limit. Through examination of the fatigue limit and the non-propagating crack the following results are obtained: (1) The surface roughness slightly influences the fatigue limit, while the work-hardened surface layer has a primary effect on the fatigue limit. (2) An increase in the diameter of the small hole decreases the fatigue limit and results in the prolongation of the non-propagating crack. (3) For the non-propagating crack, the threshold stress intensity factor range ΔKth decreases with a decrease in the crack length.

Original languageEnglish
Pages (from-to)401-409
Number of pages9
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Issue number487
Publication statusPublished - Jan 1 1987
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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