X-ray microtomographic characterisation of porosity and its influence on fatigue crack growth

P. Li, P. D. Lee, T. C. Lindley, D. M. Maijer, G. R. Davis, J. C. Elliott

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A quantitative characterization of crack growth and its interaction with the 3D morphology of porosity in A356-T6 fatigue specimens using X-ray microtomography (XMT) was studied. The path followed by the crack is governed by the stress concentration which is highest along the transverse plane ahead of the crack due to the cross-sectional area reduction. The crack was found to propagate macroscopically along a transverse plane and it exhibited a jagged appearance with relatively large voxel size. The effect of the pores on the stress/strain concentration and its link to fatigue crack growth were investigated using finite element analysis. The XMT scans of the interrupted fatigue test specimens showed that cracks tend to deviate towards pores in close proximity to the transverse plane normal to the loading direction.
    Original languageEnglish
    Pages (from-to)476-479
    Number of pages3
    JournalAdvanced Engineering Materials
    Volume8
    Issue number6
    DOIs
    Publication statusPublished - Jun 2006

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