8 Scopus citations

Abstract

Correlations among microstructure, crack-tip fields and fatigue fracture are studied in beta-annealed Ti-6Al-4V. By means of digital image correlation, the area integral of the opening strain (int) over the cyclic plastic zone was obtained, which was proportional to ΔKm, where m is the Paris exponent, so that da/dN ∝ int. Analysis shows that m≅2(2+(1+n′)-1) where n′ is the cyclic hardening exponent (0 ≤ n′ ≤ 1). This predicts 5 ≤ m ≤ 6, in agreement with experiments, and strongly suggests that fatigue fracture of beta-annealed Ti-6Al-4V can be described using non-local strain parameters.

Original languageEnglish (US)
Pages (from-to)13-16
Number of pages4
JournalScripta Materialia
Volume66
Issue number1
DOIs
StatePublished - Jan 1 2012

Keywords

  • Fatigue
  • Fracture
  • Microstructure
  • Plasticity
  • Titanium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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