The effect of porosity on the fatigue life of cast aluminium-silicon alloys

Y. X. Gao, J. Z. Yi, P. D. Lee, T. C. Lindley

    Research output: Chapter in Book/Conference proceedingConference contributionpeer-review

    Abstract

    Fatigue strength optimization of cast aluminium alloys requires an understanding of the role of micropores resulting from the casting process. High cycle fatigue tests conducted on cast A356-T6 show that the pore size and proximity to the specimen surface significantly influence fatigue crack initiation. This is supported by finite element analyses (both elastic and elastic-plastic) which demonstrate that high stress/strain concentration is induced by pores which are both large and near to the specimen surface. A new pore-sensitive model based on a modified stress-life approach has been developed which correlates fatigue life with the size of the failure-dominant pore. The model prediction is in good agreement with experimental data.
    Original languageEnglish
    Title of host publicationFatigue and Fracture of Engineering Materials and Structures|Fatigue Fract Eng Mater Struct
    Pages559-570
    Number of pages11
    Volume27
    DOIs
    Publication statusPublished - Jul 2004

    Keywords

    • Cast aluminium alloy
    • Casting porosity
    • Fatigue life prediction
    • Finite element analysis
    • Stress/strain concentration

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