Evaluation of the overload effect on fatigue crack growth with the help of synchrotron XRD strain mapping

Jonathan P. Belnoue, Tea Sung Jun, Felix Hofmann, Brian Abbey, Alexander M. Korsunsky

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The overload retardation effect on fatigue crack growth rate (FCGR) in titanium alloy Ti-6Al-4V is studied. Synchrotron X-ray diffraction strain mapping of near-crack tip regions of pre-cracked fatigued samples is used to determine the effective stress intensity factors experienced by the crack tip. The effective stress intensity factor values are computed by finding the best match between the experimental strain maps and linear elastic fracture mechanics (LEFM) predictions. The dependence of the effective stress intensity factor, K, on the applied load is plotted, and an interpretation of the overload retardation effect is proposed. The present approach permits to reconcile the traditional LEFM fatigue crack propagation prediction and the experimental measurement of strain fields.

Original languageEnglish
Pages (from-to)3216-3226
Number of pages11
JournalEngineering Fracture Mechanics
Volume77
Issue number16
DOIs
Publication statusPublished - Nov 2010
Externally publishedYes

Keywords

  • Crack closure
  • Fatigue crack growth
  • Linear elastic fracture mechanics
  • Overload retardation effect
  • Strain mapping
  • Stress intensity factor
  • Synchrotron X-ray diffraction
  • Ti-6Al-4V

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