Utilizing the meso-scale grain boundary stress to estimate the onset of delamination in 2099-T861 aluminium-lithium

Russell J. McDonald, Armand Joseph Beaudoin

Research output: Contribution to journalArticlepeer-review

Abstract

Aluminium-lithium alloys provide a lower density and higher stiffness alternative to other high strength aluminium alloys. However, many Al-Li alloys exhibit a non-traditional failure mechanism called delamination, which refers to the failure of the elongated grain boundary interface. In this investigation, delaminations were observed after cyclic deformation of both uniaxial and torsion experiments. A cyclically stable rate-independent crystal plasticity framework with kinematic hardening was developed to address many experimental trends of stabilized cyclic plasticity. Utilizing this framework, meso-scale grain boundary interface stresses were estimated with uniform deformation and bi-crystal models. These models are computationally amenable to investigate both orientation dependence and the statistical nature of the grain boundary stresses for a given bulk texture and nominal loading. A coupled shear-normal Findley-based damage parameter was formulated to quantitatively characterize the nucleation of delamination consistently with experimental trends.

Original languageEnglish (US)
Article number065007
JournalModelling and Simulation in Materials Science and Engineering
Volume18
Issue number6
DOIs
StatePublished - Oct 11 2010

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Computer Science Applications

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