Calculation of the fatigue life of a surface-hardened shaft by the finite-element method

Heikki Keinänen, Klaus Rahka

    Research output: Book/ReportReport


    This report addresses the problems encountered in machine component design when the material properties vary in the load carrying cross-section and when purely elastic design is unsuitable that is when fatigue may be an imminent failure mechanism. The problem encountered is solved by an elasto-plastic finite-element calculation for the surface hardened cylindrical SAE shaft in bending, torsion and combined bending torsion. The effective plastic strains in the cross section of me shaft are calculated and the fatigue life of the shaft is predicted according to the local strain approach. The analysed shaft is surface hardened by induction heating, the hardness and other material properties thus varying between me core and the surface. The loading is bending or torsion. Only the monotonic first quarter cycle of me loading is calculated. The fatigue life is evaluated using the calculated effective plastic strain amplitude.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages27
    ISBN (Print)951-38-4070-0
    Publication statusPublished - 1992
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications


    • shafts (machine elements)
    • surface hardening
    • fatigue
    • failure
    • fatigue life
    • predictions
    • finite element analysis
    • bending
    • torsion
    • strains


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