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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/219178
- Modelling rail wear transition and mechanism due to frictional heating
- Asih, A. M. S.; Ding, K.; Kapoor, A.
- Wear rate in a rail-wheel system has been found to be a function of temperature rise between the rail and wheel. The flash temperature due to frictional heating causes the development of thermal stresses and reduction of the material strength at the rail undergoing wear. This thermal effect leads to a rapid increase in wear rate, known as wear transition. Rail wear transition behaviour as a result of frictional heating in the contact region has been investigated using a computer modelling technique and the results are presented here. The model is based on ratchetting failure, which is caused by the accumulation of plastic strain in the rail material over many cycles. Plastic strain causes the rail material to harden but as the temperature increases, thermal softening may occur, which can reduce the strength of the material. Above a certain temperature, both thermal stress and thermal softening can significantly influence the wear rate. The variations in the slip/roll ratio, the peak pressure, the friction coefficient, and the vehicle speed on the wear rate show that the transition from mild to severe wear occurs at temperatures above 350 °C. During this transition the vehicle speed has the least effect on the temperature and wear rate among the other parameters.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences
- Wear, Vol. 284-285 (Apr 2012), pp. 82-90
- Publication year
- FOR Code(s)
- 0912 Materials Engineering; 0913 Mechanical Engineering
- Frictional heating; Ratchetting; Thermal effects; Thermal softening; Wear modelling; Wear transition
- Publisher URL
- Copyright © 2012 Elsevier B.V. All rights reserved.
- Peer reviewed