STP1367

    Fracture Mechanics Approach to the Fretting Fatigue Strength of Axle Assemblies

    Published: Jan 2000


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    Abstract

    The objective of the present paper is to evaluate the fatigue crack growth behavior in press-fitted axles using a fracture mechanics approach and to predict the fatigue strength regarding crack propagation (σw2). The relationship between nominal bending stress (σn) and non-propagating crack length in press-fitted axles is also discussed. Rotating bending fatigue tests were conducted on the induction hardened and quench-tempered axles of 38 and 40 mm in diameter. The equation for ΔK was formulated from the result of FEM analyses in which the micro-profile at the contact edge was taken into consideration. The threshold stress intensity factor range ΔKth for small cracks was estimated from the crack size measured after the fatigue tests by using a modified stress ratio effect at fully compressed stress reversals due to high compression residual stress. σw2 and the relationship between σn and non-propagating crack length were predicted by using the above mentioned ΔK and ΔKth. The predicted σw2 and non-propagating crack length were in good agreement with the experimental values.

    Keywords:

    fretting fatigue, fracture mechanics, axle assemblies, fatigue strength, small crack growth behavior, non-propagating crack, FEM analysis, stress intensity factor, induction hardening


    Author Information:

    Makino, T
    Research Engineer and Senior Research Engineer, Sumitomo Metal Industries, Ltd., Amagasaki city, Hyogo,

    Yamamoto, M
    Research Engineer and Senior Research Engineer, Sumitomo Metal Industries, Ltd., Amagasaki city, Hyogo,

    Hirakawa, K
    Professor, Kyushu University, Fukuoka city, Fukuoka,


    Paper ID: STP14751S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP14751S


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