Full field measurements of anisotropic stress intensity factor ranges in fatigue

Garrett J. Pataky, Michael D. Sangid, Huseyin Sehitoglu, Reginald F. Hamilton, Hans J. Maier, Petros Sofronis

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of anisotropy during mixed mode fatigue crack growth were studied in single crystal 316L stainless steel. An anisotropic least-squares regression algorithm using displacements from digital image correlation was developed to find the effective stress intensity factors, K I and K II, and the T-stress. Crack tip plastic zones were determined using an anisotropic yield criterion. Strains in the plastic zone obtained from digital image correlation showed a dependence on the crystallography and load ratio. Crack tip slip irreversibility was measured and showed an increasing trend with increasing crack length; this information is critical for describing crack growth behavior.

Original languageEnglish (US)
Pages (from-to)13-28
Number of pages16
JournalEngineering Fracture Mechanics
Volume94
DOIs
StatePublished - Nov 1 2012

Keywords

  • Effective stress intensity factor
  • Fatigue crack growth
  • Mixed mode fracture
  • Plastic zones
  • Slip irreversibility

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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