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Probability of subsurface fatigue initiation in rolling contact

Johan Sandström (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Jacques de Maré (Institutionen för matematiska vetenskaper, matematisk statistik)
Proceedings of the 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems Vol. 2 (2009), p. 419-424.
[Konferensbidrag, refereegranskat]

Subsurface initiated rolling contact fatigue cracks initiate in the vicinity of material defects. As these exist randomly in the material, fatigue will appear randomly under otherwise constant conditions. By combining statistical methods with a contact mechanics and fatigue analysis, probabilities of fatigue initiation are evaluated. The developed model takes as input contact geometry, contact load and the statistical properties of the material defects. It is shown that under some well-defined presumptions the probability of rolling contact fatigue initiation in a rolling wheel can be expressed by a simple formula. Based on this, the parametric influence is assessed and it is found that the mean material defect size has a large influence. The benefit of material cleanliness testing procedures and the influence of the allowed defect size on the risk of subsurface initiated rolling contact fatigue in railway wheels are then quantified with the aid of numerical simulations.

Denna post skapades 2009-10-07.
CPL Pubid: 99837


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)
Institutionen för matematiska vetenskaper, matematisk statistik (2005-2016)


Matematisk statistik
Teknisk mekanik

Chalmers infrastruktur