Strain profiling of fatigue crack overload effects using energy dispersive X-ray diffraction

Mark Croft, Z. Zhong, N. Jisrawi, I. Zakharchenko, R. L. Holtz, J. Skaritka, T. Fast, K. Sadananda, M. Lakshmipathy, Thomas Tsakalakos

Research output: Contribution to journalConference articlepeer-review

69 Scopus citations

Abstract

Synchrotron based energy dispersive X-ray diffraction has been used to profile the strains around fatigue cracks in 4140 steel test specimens. In particular strain field comparisons were made on specimens prepared: with initial constant stress intensity fatigue; with this initial fatigue followed by a single overload cycle; and with this fatigue-overload sequence followed by an additional constant stress intensity fatigue. The strain profiles behind, at and in-front-of the crack tip are discussed in detail. Selected strain profiles measurements under in situ applied tensile stress are also presented. The technique of optical surface height profiling reveals surface depression effects which can be correlated with the interior strain profiles.

Original languageEnglish (US)
Pages (from-to)1408-1419
Number of pages12
JournalInternational Journal of Fatigue
Volume27
Issue number10-12
DOIs
StatePublished - Oct 2005
EventFatigue Damage of Structural Materials V -
Duration: Sep 19 2004Sep 24 2004

All Science Journal Classification (ASJC) codes

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

Keywords

  • Fatigue
  • Overload
  • Strain
  • Synchrotron
  • X-ray

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