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A methodology to predict thermomechanical cracking of railway wheel treads: From experiments to numerical predictions

Ali Esmaeili (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Mandeep Singh Walia (Institutionen för tillämpad mekanik, Dynamik) ; Kazuyuki Handa ; Katsuyoshi Ikeuchi ; Magnus Ekh (Institutionen för industri- och materialvetenskap, Material- och beräkningsmekanik ) ; Tore Vernersson (Institutionen för tillämpad mekanik, Dynamik) ; Johan Ahlström (Institutionen för material- och tillverkningsteknik, Materialteknologi)
International Journal of Fatigue (0142-1123). Vol. 105 (2017), p. 71-85.
[Artikel, refereegranskad vetenskaplig]

In the present study, thermomechanical cracking of railway wheel treads is studied by full-scale brake rig tests and finite element simulations. The main goal of the paper is to perform thermomechanical rolling contact fatigue life predictions. The wheel tread material is subjected to simultaneous mechanical and thermal loads due to rolling contact and stop braking, respectively. Full-scale tests featuring three series of repeated stop braking cases have been performed in a brake rig featuring a tread braked wheel that is in rolling contact with a so-called rail-wheel. The brake rig test conditions have been simulated numerically using the finite element method where the effect of “hot bands” on the tread is accounted for as indicated by the experimental findings. Stresses induced by temperature from braking as well as tractive rolling contact loading on the tread are considered. The mechanical response of the wheel material ER7 is obtained from a plastic Chaboche material model calibrated against data from cyclic experiments at room temperature and up to 625 °C. Finally, a strategy for prediction of fatigue life with respect to ratchetting failure is discussed.

Nyckelord: Full-scale brake rig testing; Railway wheels; Rolling contact fatigue; Thermomechanical finite element analysis; Tread braking



Denna post skapades 2017-09-28. Senast ändrad 2017-11-15.
CPL Pubid: 252105

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)
Institutionen för tillämpad mekanik, Dynamik (1900-2017)
Institutionen för industri- och materialvetenskap, Material- och beräkningsmekanik
Institutionen för material- och tillverkningsteknik, Materialteknologi (2005-2017)

Ämnesområden

Materialteknik

Chalmers infrastruktur