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RESEARCH PAPERS

Elastic-Plastic Partial Slip Rolling Wheel-Rail Contact with an Oblique Rail Crack

[+] Author and Article Information
Yung-Chuan Chen

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

Jao-Hwa Kuang

Department of Mechanical and Electro-Mechanical Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan, Republic of China 80424

J. Tribol 127(4), 705-712 (Mar 29, 2005) (8 pages) doi:10.1115/1.2033006 History: Received November 25, 2004; Revised March 29, 2005

This study employs an elastic-plastic finite element model to investigate the effect of oblique rail surface crack on the wheel-rail contact stress distribution under partial slip rolling conditions. Numerical simulations are performed to explore the effects of the contact distance and tractive force on the contact pressure and tangential stress distributions, tip plastic energy, and critical wheel applied load. Contact elements are used to simulate the interaction between the surfaces of the wheel rail and the crack. The numerical results indicate that the contact stress distributions are influenced significantly by the presence of oblique cracks in the rail. The results also indicate that a higher friction force is induced on the crack surfaces when a greater tractive force is applied to the wheel. This increased crack surface friction force reduces the sliding between the crack surfaces and hence causes a reduction in the tip plastic energy.

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Copyright © 2005 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

Tangential stress distribution under partial slip rolling contact condition

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Figure 3

Finite element mesh details near crack edge

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Figure 4

Elastic contact stress distributions for different tractive force ratios, (a) contact pressure, (b) tangential stress

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Figure 5

Elastic-plastic contact pressure distributions for different tractive force ratios, (a) contact pressure, (b) tangential stress

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Figure 6

Variations in normal contact pressure distribution for different contact distances

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Figure 7

Effect of crack on tangential stress distribution for different contact distances, (a) for ℓ∕ao=−0.34 to −2.04, (b) for ℓ∕ao=0.56–2.2

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Figure 8

Deformation of rail surface near crack edge

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Figure 9

Variations in tip plastic energy at various tractive force ratios

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Figure 10

Variation in contact force on crack surfaces for different tractive force ratios

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Figure 11

Variations in plastic zone boundary, (a) for different contact distances, (b) for different tractive force ratios

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Figure 12

von Mises stress distribution at different contact distances

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Figure 13

Relationship between fracture toughness and critical tip plastic energy

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Figure 14

Estimate of critical wheel applied load calculated from critical tip plastic energy

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