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Assessing risks of subsurface initiated rolling contact fatigue from field measurements

Elena Kabo (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Roger Enblom ; Anders Ekberg (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
Proceedings 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems Vol. 1 (2009), p. 355-361.
[Konferensbidrag, refereegranskat]

A previous simplification of the Dang Van equivalent stress measure for cases of wheel–rail contact is modified. The new criterion for subsurface initiated rolling contact fatigue is suited for real-time assessment of measured wheel–rail contact forces. The only parameters in the new expression for the equivalent stress are the vertical force and the wheel and rail radii. Comparisons between the new and the original criterion are carried out and show good agreement for the studied cases of tangent track operation. By employing principles of vehicle dynamics the criterion is further extended to the case of operations in curves. Finally the influence of transient loads on the growth of RCF cracks in wheels was investigated. It was demonstrated that transients need to be spaced closer than roughly 10 meters to give any substantial increase in crack growth rates.



Denna post skapades 2010-01-14. Senast ändrad 2017-03-21.
CPL Pubid: 107326

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)

Ämnesområden

Fastkroppsmekanik

Chalmers infrastruktur