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The influence of rail surface irregularities on contact forces and local stresses

Robin Andersson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Peter Torstensson (Institutionen för tillämpad mekanik, Dynamik) ; Elena Kabo (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Fredrik Larsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
Vehicle System Dynamics (0042-3114). Vol. 53 (2014), 1, p. 68-87.
[Artikel, refereegranskad vetenskaplig]

The effect of initial rail surface irregularities on promoting further surface degradation is investi- gated. The study concerns rolling contact fatigue formation, in particular in the form of the so-called squats. The impact of surface irregularities in the form of dimples is quantified by peak magnitudes of dynamic contact stresses and contact forces. To this end simulations of two-dimensional (later extended to three-dimensional) vertical dynamic vehicle–track interaction are employed. The most influencing parameters are identified. It is shown that even very shallow dimples might have a large impact on local contact stresses. Peak magnitudes of contact forces and stresses due to the influence of rail dimples are shown to exceed those due to rail corrugation.

Nyckelord: rail surface irregularities, squats, RCF, rail corrugation



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Denna post skapades 2014-12-05. Senast ändrad 2017-03-21.
CPL Pubid: 207482

 

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