A simple computational method is developed and illustrated to treat subsurface fatigue initiation for cases in which fatigue properties and residual stresses vary with depth. It incorporates a bulk fatigue initiation criterion for non-proportional stressing due to rolling contact and expressions for maximum shear stress amplitude for general profile radii. Some demonstrations of this new methodology are provided that show the effect of contact ellipse orientation, wheel tread profile, wheel load and rail steel fatigue properties and residual stress distribution. In general the combination of head hardened properties and typical residual stress distributions increase fatigue initiation life and the depth of crack initiation.
A practical method for predicting the effect of material properties and residual stresses on rail subsurface fatigue initiation
Eine praktische Methode zur Vorhersage des Einflusses der Werkstoffeigenschaften und der Eigenspannungen auf die Ermüdungsrißbildung im oberflächennahen Bereich der Schiene
1995
9 Seiten, 12 Bilder, 1 Tabelle, 22 Quellen
Conference paper
English
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