Quantitative evaluation of the fatigue limit of a metal with an arbitary crack under a stress controlled condition

Tatsujiro Miyazaki, Hiroshi Noguchi, Keisaku Ogi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

In this paper, the result from rotating bending fatigue tests of notched specimens are carried out on aluminum cast alloys and high strength steels with HB ≃ 600 are reported. The threshold stress intensity factor range under a stress controlled condition, ΔKw, is introduced for the purpose of predicting the fatigue limit of a metal with an arbitrary crack. The ΔKw value of a long crack, ΔKwU L, is obtained from the fatigue crack propagation limit σW2 of specimens with a sharp and deep notch; ΔKw increases with crack length, and ΔKwU L is an upper limit of ΔKw, Since there are few σw2 data of steels with HB ≥ 400, the σw2 values are evaluated by the fatigue crack initiation limit predicted using Linear Notch Mechanics and the relation between σw1 and σw2 at the branch point. Using ΔKwU L values of many metals with a long crack, the ΔKWU L values are approximated with a simple formula. Moreover the lower limit value of ΔKwU L versus the crack length, ΔKwLL, is proposed. Then using the AKw and ΔKwUL formulae and the ΔKwLL value, the smallness of a fatigue crack is clarified.

Original languageEnglish
Pages (from-to)21-38
Number of pages18
JournalInternational Journal of Fracture
Volume129
Issue number1
DOIs
Publication statusPublished - Sep 2004

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials

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