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  • Carrying capacity of hardened raceway
    Kunc, Robert ; Prebil, Ivan ; Torkar, Matjaž
    ǂThe ǂpaper deals with the problem of the actual carrying capacity of a rolling contact in large axial bearings with surface hardened raceway. The carrying capacity of such bearings is usually given ... with the maximal permissible force on the rolling element with the highest load. The established criteria of maximal permissible plastic displacement of the raceway, and the maximal allowed subsurface stress on the hardened layer boundary give widely varying values for the carrying capacity of the rolling contact. The criterion of allowed permanent displacement is unsuitable, mainly due to the technology. It supposes that both rings are hardened through the whole section, with very high surface hardness - over 63 HRc. The main deficiency of the criterion of allowed shear stress on the edge of the hardened layer is the computation of the subsurface stresses according to Hertz theory. This computation considers only the elastic region of the material deformation curve, and therefore disregards the plastic material hardening. In order to determine the actual carrying capacity of the rolling contact in axial bearings with low speed of rotation, considering base material properties, hardness and thickness of the hardened layer, and the geometry of the contact, we have measured the models of bearing raceways made of 42CrMo4 and C45 materials (ISO 683/1). The loads were low cycle dynamic. We have determined the cyclic curves, limit of fast increase in displacement gradient, and the size of the contact surface. Simultaneously with the experiment, we have checked the sub surface stresses using a FEM model, considering the material non linearities, which we have determined with the experiment.
    Vir: Computational methods in contact mechanics IV (Str. 313-320)
    Vrsta gradiva - prispevek na konferenci
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 3264539

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