The current paper focuses on the influence of defect size of material defects on rolling contact fatigue of railway wheels. As the state of stress and strain in the vicinity of a defect subjected to a passing rolling contact is very complex, elasto-plastic FE-simulations have been combined with a multiaxial fatigue evaluation to quantify the fatigue impact. The simulations show that fatigue impact at a defect for uniaxial and rolling contact loading differ. This makes the use of existing uniaxial models insufficient to account for the effect of defect size. Parametric studies using elasto-plastic FE-simulations were carried out to assess the influence of defect sizes on rolling contact fatigue impact. If the maximum fatigue impact at the defect edge is taken as a measure of the fatigue impact, an increase in defect size from a diameter of 1 mm to 2 mm would give an increase in fatigue impact of about 45% - 60% at a load of 12 MN/m for the studied case. Instead of measuring the maximum fatigue impact at the defect edge, a refined study of the fatigue impact also outside the perimeter of the defect was carried out. Using the results of these simulations, the effect of an altered defect size was related to a change in bad magnitudes by identifying upper and lower boundaries. From these studies, it could be concluded that an increase in defect size from 1 mm to 2 mm would, at worst, be similar to increasing the bad magnitude from 12 MN/m to 15 MN/m. The task of evaluating the effect of material defect size on rolling contact fatigue resistance is complicated by the fact that experimental verifications are cumbersome to obtain. Consequently, numerical studies, have to stand unsupported by experimental validation. However, they do provide a basis for more educated prescriptions of material cleanliness. Further, if full scale tests are to be carried out, the current studies provide a foundation that can limit the amount of test cases.


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    Title :

    Material defects in rolling contact fatigue of railway wheels - The influence of defect size


    Contributors:
    Kabo, E. (author) / Ekberg, A. (author)


    Publication date :

    2003


    Size :

    7 Seiten, 7 Bilder, 12 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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