Effect of mean stress and stress concentration factor on fatigue limits of middle and high strength steels

Masami Nakamura, Keiichiro Tsuchiya, Shota Hasunuma, Takeshi Ogawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Ultrasonic fatigue tests were performed on notched specimens of medium strength steel, 2.25Cr-1Mo, and the bolt specimens of high strength steel, SNB7, under mean stress application, which was enabled by our original loading device in house. Stress concentration factor, α, and nominal stress of the notched specimens were obtained by means of static and dynamic analyses of finite element method. For the notched specimen of 2.25Cr-1Mo steel, stress amplitude, σa, at fatigue limit hardy reduced by the application of mean stress, σm, since maximum stress, σmax, exceeded the yield stress, σys, by a small amount of tensile σm application and the shakedown behavior took place. While for the bolt specimen of SNB7, σ a at fatigue limit reduced by tensile σm application, however, it tended to be constant when the σmax exceeded the σys to result in the shakedown behavior. It has been widely recognized that αis necessary to be considered for σ a but not for σm in order to predict the effect of stress concentration on the fatigue limit. However, αshould be considered for both σa and σm depending on the certain combinations of the material strength and the stress concentration condition.

Original languageEnglish
Pages (from-to)228-232
Number of pages5
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume65
Issue number3
DOIs
Publication statusPublished - Mar 2016

All Science Journal Classification (ASJC) codes

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

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