A Tool To Estimate The Wheel/rail Contact
And Temperature Rising Under Dry, Wet And
Oily Conditions
Author(s)
K. D. Vo, A. K. Tieu, H. T. Zhu, & P. B. Kosasih
Abstract
In this paper, finite element method (FEM) has been applied to evaluate the
wheel/rail contact stress under different contact conditions. The elastic-plastic
model coded in ANSYS/LS-DYNA includes a whole wheel, 680 mm of the
canted rail, and sub-components of the track (railpads, sleepers, and ballast).
The three values of friction coefficient 0.4, 0.2 and 0.07 have been chosen to
model the dry, wet and oily environmental contacts, respectively. The high
mechanical stresses exerted at the contact area will cause the temperature rise,
which results in decreasing of the yield strength of the wheel/rail. The growth of
temperature is a major source of the various microstructure changes that occurs
on the rail surface, especially the formation of White Etching Layer (WEL).
Therefore, a theoretical calculation of heat generation has also been implemented
in the current research. The output data from the FEM models have been
considered as the input for the theoretical thermal model to examine temperature
rising on and beneath the rail surface. The combination of finite element method
for contact stress and theoretical thermal method for temperature variation would
provide a better understanding about wheel/rail contact under a variety of contact
conditions (dry, wet, and oily). Various scenarios of damage mechanisms of rail
have been considered in the paper.
The obtained results from the model have revealed that the influence of
environmental conditions on normal contact stress, pressure and contact area is
negligible. In contrast, the magnitude of the Von-Mises stress and lateral and
longitudinal stresses components can be significantly varied depending on the
Keywords
finite element method, dry/wet/oil contact, temperature rising
Related Book
Other papers in this volume
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