Ductile failure behavior of polycrystalline Al 6061-T6 under shear dominant loading

Ali Ghahremaninezhad-M, K. Ravi-Chandar

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Ductile failure in polycrystalline aluminum alloys under pure shear as well as with superposed tension and compression loading is explored through the modified Arcan shear experiments. Specimens obtained through tests interrupted at various stages of deformation and failure evolution are examined through quantitative 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 in low triaxiality conditions are obtained from the experiments. It is shown that strain-to-failure decreases monotonically with stress triaxiality in stark contrast with recent works where a reverse behavior in low stress triaxiality levels was reported. Eventual failure that occurs through void growth and coalescence is shown to be restricted to a very small region within the localized deformation band.

Original languageEnglish
Pages (from-to)23-39
Number of pages17
JournalInternational Journal of Fracture
Volume180
Issue number1
DOIs
StatePublished - Mar 1 2013

Fingerprint

Aluminum alloys
Aluminum Alloy
Coalescence
Gages
Microscopic examination
Grain Size
Voids
Experiments
Microscopy
Experiment
Reverse
Gauge
Compression
Damage
Likely
Lower bound
Decrease
Evaluate
Estimate
Observation

Keywords

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

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Modeling and Simulation

Cite this

Ductile failure behavior of polycrystalline Al 6061-T6 under shear dominant loading. / Ghahremaninezhad-M, Ali; Ravi-Chandar, K.

In: International Journal of Fracture, Vol. 180, No. 1, 01.03.2013, p. 23-39.

Research output: Contribution to journalArticle

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