Dynamic strain evolution around a crack tip under steady- and overloaded-fatigue conditions

Soo Yeol Lee*, E-Wen Huang, Wanchuck Woo, Cheol Yoon, Hobyung Chae, Soon Gil Yoon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

We investigated the evolution of the strain fields around a fatigued crack tip between the steady- and overloaded-fatigue conditions using a nondestructive neutron diffraction technique. The two fatigued compact-tension specimens, with a different fatigue history but an identical applied stress intensity factor range, were used for the direct comparison of the crack tip stress/strain distributions during in situ loading. While strains behind the crack tip in the steady-fatigued specimen are irrelevant to increasing applied load, the strains behind the crack tip in the overloaded-fatigued specimen evolve significantly under loading, leading to a lower driving force of fatigue crack growth. The results reveal the overload retardation mechanism and the correlation between crack tip stress distribution and fatigue crack growth rate.

Original languageEnglish
Pages (from-to)2109-2118
Number of pages10
JournalMetals
Volume5
Issue number4
DOIs
StatePublished - 12 Nov 2015

Keywords

  • Crack growth
  • Fatigue
  • Neutron diffraction
  • Overload
  • Stress/strain

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