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Numerical evaluation of the material response of a railway wheel under thermomechanical braking conditions

Sara Caprioli (Institutionen för tillämpad mekanik, Dynamik) ; Anders Ekberg (Institutionen för tillämpad mekanik, Dynamik)
Wear (0043-1648). Vol. 314 (2013), 1-2, p. 181-188.
[Artikel, refereegranskad vetenskaplig]

The material response of a railway wheel subjected to thermomechanical rolling contact is evaluated. Thermal and mechanical loads are combined in a three-dimensional sequentially coupled analysis where nodal temperatures from a transient thermal analysis are applied as predefined fields in a structural analysis featuring an elastic-plastic material model. The mechanical contact load is prescribed as a moving Hertzian contact stress distribution with a surface shear stress distribution corresponding to full or partial slip conditions. Modelling aspects studied in detail are feasible model resolution at the contact patch, the influence of sequences of thermal and mechanical loads, and the influence of wheel--rail interfacial shear distributions. The study identifies feasible mesh sizes and load application strategies to obtain a good accuracy at reasonable computational efforts. Further, differences in predicted material response under full slip and partial slip conditions are assessed. It is found that for a given total tangential force, partial slip conditions result in larger plastic strain magnitudes in a thin layer near the contact surface

Nyckelord: Partial slip; Full slip; Rolling Contact Fatigue; Thermomechanical loading; Braking conditions

Wear, special issue. Conference: 9th Conference on Contact Mechanics and Wear of Rail/Wheel Systems Location: SW Jiaotong Univ, State Key Lab Tract Power, Chengdu, PEOPLES R CHINA Date: AUG, 2012

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Denna post skapades 2014-01-17. Senast ändrad 2014-09-17.
CPL Pubid: 192819


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Institutionen för tillämpad mekanik, Dynamik



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