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Research Papers: Contact Mechanics

Elastic-Plastic Wheel-Rail Thermal Contact on Corrugated Rails During Wheel Braking

[+] Author and Article Information
Yung-Chuan Chen1

Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan 91201chuan@mail.npust.edu.tw

Sing-You Lee

Department of Vehicle Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan 91201

1

Author to whom correspondence should be addressed.

J. Tribol 131(1), 011401 (Nov 26, 2008) (9 pages) doi:10.1115/1.2991163 History: Received November 01, 2006; Revised August 17, 2008; Published November 26, 2008

This study uses an elastic-plastic, coupled temperature-displacement finite element model to investigate the effect of rail corrugations on the wheel-rail thermal contact stress and temperature distribution during wheel braking. The finite element model assumes that the material properties and the friction coefficient are temperature-dependent. The analysis considers various corrugation wavelengths and amplitudes and is performed over a range of braking speeds. The results indicate that the corrugated rail induces wavelike contact pressure and temperature distributions on the rail surface. The results also show that the variation in the peak contact pressure increases as the corrugation wavelength is reduced or as the corrugation amplitude is increased. Furthermore, it is found that the corrugated rail shifts the location of the peak value of the rail surface temperature toward the leading edge of the contact region. The amplitude of the temperature fluctuations reduces as the corrugation wavelength is increased or as the corrugation amplitude is reduced. Finally, a higher corrugation amplitude or a shorter corrugation wavelength causes the location of the peak maximum shear stress to shift toward the rail surface.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Wheel-rail contact model

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Figure 2

Finite element model of wheel-corrugated rail contact: (a) finite element mesh for wheel-rail contact and (b) detailed view of mesh in the contact region

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Figure 3

Variation of wheel-rail contact pressure distributions p/p0 along the direction of movement x: (a) short corrugation wavelength L=60 mm and δ=0.25 mm; (b) long corrugation wavelength L=120 mm and δ=0.25 mm

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Figure 4

Variation in maximum contact pressure pmax/p0 as a function of corrugation wavelength: (a) maximum contact pressure peak distribution pmax/p0 and (b) enlarged view from a position of x/a0=6 to x/a0=10

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Figure 5

Deformed profiles of wheel and corrugated rail surfaces: (a) wheel center located at x/a0=8.69 and (b) wheel center located at x/a0=9.63

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Figure 6

Variation in maximum contact pressure pmax/p0 as a function of corrugation amplitude

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Figure 7

Variation in maximum rail surface temperature Tmax with sliding distance as a function of corrugation wavelength

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Figure 8

Variation in maximum rail surface temperature Tmax with sliding distance as a function of corrugation amplitude

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Figure 9

Variation in maximum rail surface temperature Tmax with sliding distance as a function of braking speed

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Figure 10

Variation in rail surface temperature distributions with distance from the contact point as a function of braking speed: (a) smooth rail and (b) corrugated rail

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Figure 11

Variation of wheel-rail contact pressure distributions p/p0 at different contact positions

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Figure 12

Variation in rail surface temperature with distance from the contact point as a function of corrugation amplitude

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Figure 13

Variation in maximum shear stress τmax/p0 with distance from the rail surface as a function of corrugation wavelength

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Figure 14

Variation in maximum shear stress τmax/p0 with distance from the rail surface as a function of corrugation amplitude

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Figure 15

Variation in maximum shear stress τmax/p0 with distance from the rail surface as a function of braking speed

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Figure 16

Variation in maximum shear stress τmax/p0 with distance from the rail surface as a function of sliding distance

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