A high cycle fatigue model for the prediction of component lifetime in elastic rolling contacts is developed and applied. Varying magnitudes and positions of the contact loads are described by use of discretized statistical distributions. Longitudinal and lateral adhesion are included. The Hertzian contact pressures are analytically found, and the corresponding subsurface stresses are calculated using a numerical integration scheme starting from the exact point force solutions of Boussinesq and Cerruti. Triaxial fatigue with rotating directions of principal stresses is studied using the Dang Van fatigue initiation criterion, together with the Palmgren-Miner damage accumulation law. The full model has been implemented in a computer code. A wheel/rail contact problem is treated and the results are compared to previous numerical and experimental data. Application of the method to a typical wheel/rail contact problem is made. Calculated stresses agree well with analytical results. The maximum damage is found at a depth of 3.5 mm below the wheel tread surface. In planned subsequent studies the model will be calibrated by use of statistics of wheel load and wheel damage from revenue train operations. The model will also be extended to include the influence of elastic and plastic shakedown.
A fatigue life model for general rolling contact with application to wheel/rail damage
Ein Modell für die Lebensdauervorhersage für einen allgemeinen Rollkontakt mit Anwendung auf Rad-Schienen-Abnutzung
Fatigue and Fracture of Engineering Materials and Structures ; 18 , 10 ; 1189-1199
1995
11 Seiten, 10 Bilder, 1 Tabelle, 24 Quellen
Article (Journal)
English
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