The effect of load stepdown on fatigue crack arrest and retardation

Huseyin Sehitoglu, D. L. McDiarmid

Research output: Contribution to journalArticlepeer-review


The effect of a decrease in stress range on fatigue crack propagation behaviour in mild steel plate is investigated. The delay period between the arrest of a Stage II crack and its re-propagation is found to be a function of load stepdown ratio and specimen thickness. The length over which crack retardation is observed is related to the platic zone size associated with the initial high stress level. Non-propagating cracks occur when the ratio of the stepdown stress intensity range is approximately 0.6 times the initial stress intensity range, for the thicknesses tested.

Original languageEnglish (US)
Pages (from-to)55-60
Number of pages6
JournalInternational Journal of Fatigue
Issue number2
StatePublished - Apr 1980
Externally publishedYes

ASJC Scopus subject areas

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


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