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Stress gradient effects in surface initiated rolling contact fatigue of rails and wheels

Anders Ekberg (Institutionen för tillämpad mekanik, Dynamik) ; Elena Kabo (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Roger Lundén (Institutionen för tillämpad mekanik, Dynamik) ; Motohide Matsui
Wear (0043-1648). Vol. 366-367 (2016), p. 188-193.
[Artikel, refereegranskad vetenskaplig]

The paper investigates gradient effects, which relate to how highly stressed regions should be dealt with in fatigue design analyses. In particular stress gradients in rolling contact are investigated with a focus on differences in response between full and partial slip conditions. To this end the multiaxial state of stress beneath a wheel–rail contact featuring full or partial slip is quantified using a multiaxial equivalent stress criterion. A comparative study shows that the significant differences in peak interfacial shear stress magnitudes between full and partial slip conditions are significantly reduced when translated to equivalent stress magnitudes. An innovative procedure to quantify the gradient effects by comparing the multiaxial contact stress field to uniaxial conditions is developed and employed. For the studied cases stress gradients beneath the frictional contact were found to be similar to stress gradients outside a uniaxially loaded large plate featuring a small hole with a radius in the order of 0.5–0.7 mm. The study concludes that the use of local magnitudes of interfacial shear stress in the analysis of surface initiated rolling contact fatigue under partial slip conditions is conservative. The analysis framework established in the current study can be used to estimate the level of conservativeness.

Nyckelord: Equivalent stress criterion; Notch sensitivity factor; Rolling contact fatigue; Stress gradient effect



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Denna post skapades 2016-12-30. Senast ändrad 2017-03-21.
CPL Pubid: 246538

 

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