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

作者: Russell J McDonald , Armand J Beaudoin

DOI: 10.1088/0965-0393/18/6/065007

关键词:

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

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