Fatigue crack-tip stress mapping using neutron diffraction

Gyudong Choi, Min Ho Lee, E-Wen Huang, Wanchuck Woo, Soo Yeol Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Fatigue crack growth experiments were carried out on a 304 L stainless steel compact-tension(CT) specimen under load control mode. Neutron diffraction was employed to quantitatively measure the residual strains/stresses and the evolution of stress fields in the vicinity of a propagating fatigue-crack tip. Three principal stress components (i.e. crack growth, crack opening, and through-thickness direction stresses) were examined in-situ under loading as a function of distance from the crack tip along the crack-propagation path. The stress/strain fields, measured both at the mid-thickness and near the surface of the CT specimen, were compared. The results show that much higher compressive residual stress fields developed in front of the crack tip near the surface than developed at the mid-thickness area. The change of the stresses ahead of the crack tip under loading is more significant at the mid-thickness area than it is near the surface.

Original languageEnglish
Pages (from-to)690-693
Number of pages4
JournalKorean Journal of Materials Research
Volume25
Issue number12
DOIs
StatePublished - 1 Jan 2015

Keywords

  • Crack growth
  • Fatigue
  • Neutron diffraction
  • Stainless steel
  • Stress field

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