Fatigue strength reduction factor of crack initiation life basis for austenitic stainless steel

Takao Utsunomiya, Daisuke Kinoshita, Tohru Hirai, Kunihiro Iida

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Abstract

The fatigue strength reduction factor (Kf) of fatigue crack initiation life (Nc) basis was previously proposed by one of the authors as a function of the elastic stress concentration factor (Kt) and work hardening constants in the cyclic hysteresis loop. The validity of the fundamental relation was shown mainly through the experimental investigations using mild steel, high strength steel and weld metals. In the present study, an applicability of the relation to an austenitic stainless steel was investigated, by tension-compression axial loading fatigue tests of double side notched plate specimens of SUS316NG steel. The Kt was changed from 1.08 to 6. As a result of the fatigue tests, Kf of Nc basis showed a linear relationship against Kt, but the Kf was always lower than Kt, though the former was nearly equal to the latter in the previous investigation, The theoretical equation predicting Kf as a function of Kt was partially modified by applying a new concept on the hysteresis energy per cycle so as to show a good agreement between experimental and theoretical values of Kf.

Original languageEnglish
Pages (from-to)1035-1040
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume48
Issue number9
DOIs
Publication statusPublished - 1999 Sep

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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