Ductile failure behavior of polycrystalline Al 6061-T6

A. Ghahremaninezhad, K. Ravi-Chandar

Research output: Contribution to journalArticle

64 Scopus citations

Abstract

Ductile failure in polycrystalline aluminum alloys is explored through uniaxial tension and notched tension experiments. Specimens obtained through tests interrupted at various stages of deformation and failure evolution are examined through microscopy to discern the mechanisms of failure and to evaluate the local strain evolution quantitatively. Fractographic observations are used to identify the onset and evolution of damage processes during deformation and failure of these aluminum alloys. Local strain levels are estimated from measurements of the change in grain size with deformation and used to indicate that the local values of failure strains are likely to be much larger than that estimated from strains averaged over characteristic specimen dimensions such as the gage length or the specimen diameter. Lower bound estimates of the failure strain at moderate triaxiliaties are obtained from the experiments.

Original languageEnglish (US)
Pages (from-to)177-202
Number of pages26
JournalInternational Journal of Fracture
Volume174
Issue number2
DOIs
StatePublished - Apr 1 2012
Externally publishedYes

Keywords

  • Damage nucleation
  • Failure mechanism
  • Local strain measures
  • Strain-to-failure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Modeling and Simulation

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