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  • Pitting formation due to rolling-sliding contact loading [Elektronski vir]
    Fajdiga, Gorazd ; Flašker, Jože
    In modem industry, the designer is commonly restricted by the requirement that mechanical elements, like wheels, gears, bearings, cams, etc., should carry high loads at high speed with both size and ... weight kept to a minimum. For such applications, predicting component operational failure becomes crucial for ensuring an adequate design. Mechanical elements subjected to rolling and sliding contact conditions fail by several mechanisms, and the most prominent among these is surface pitting .The mechanism of pitting caused by rolling-sliding contact is analysed using the frac1nre mechanics approach. The governing factors are the initial crack length, crack angle, contact pressure which takes into account the EHD-Iubrication conditions, tangential loading due to friction between contacting surfaces, moving contact conditions, residual stresses due to heat treatment of the material and the hydraulic pressure of trapped fluid acting on the crack surface. The virtual crack extension (VCE) method, implemented in the finite element method, is than used for simulating the fatigue crack propagation from the initial crack up to the formation of the surface pit. The model is applied to a real pitting problem of a gear and corresponding computational results in terms of pit sizes correlate well to the development of micro pits observed in experimental testing.
    Vir: New trends in fatigue and fracture II, 12-13 May 2003 Hammamet [Elektronski vir] (14 f.)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2003
    Jezik - angleški
    COBISS.SI-ID - 7959062

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