Engineering definitions of small crack and long crack at fatigue limit under tensile mean stress and a prediction method for determining the fatigue limit of a cracked Mg alloy

Shigeru Hamada, Takuya Kinoshita, Kazunori Morishige, Komei Hayashi, Toshiyuki Ishina, Hiroshi Noguchi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A simple method was proposed for evaluating the influence of mean stress on the fatigue limit of a cracked specimen using engineering approximations. Three types of crack sizes were introduced for evaluation: an "extra small crack," a "small crack," and a "long crack". The threshold stress intensity factor range was shown for each size based on crack non-propagation behavior using physical foundations. The effect of mean stress on the fatigue limit of the cracked specimen was formulated, and fatigue tests were performed on a magnesium alloy to check the approximation errors, which were found to be almost within 10%. Furthermore, the small-long crack transition was characterized experimentally.

Original languageEnglish
Pages (from-to)86-94
Number of pages9
JournalInternational Journal of Fatigue
Volume56
DOIs
Publication statusPublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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