Surface roughness and plastic flow in rail wheel contact

Kapoor, Ajay; Franklin, FJ; Wong, S.K.; Ishida, Masaharu

doi:10.1016/s0043-1648(02)00111-4

Cited by 109 publications

(55 citation statements)

References 12 publications

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“…In line with previous works [24], we can explain this finding as follows. At the beginning of the friction test, only asperities were in contact with the pin.…”

Section: Wear Analysis and Surface Damagesupporting

confidence: 90%

Effect of surface topography with different groove angles on tribological behavior of the wheel/rail contact using alternative machine

Khalladi

Elleuch

2016

Friction

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Abstract:The objective of this study was to investigate the influence of the surface topography on the tribological behavior of the wheel/rail contact. Four different groove orientations forming the surface topographies-smooth surface, 0°, 45° and 90°-were manufactured by grinding and compared. All friction tests with different surface topographies were conducted using an alternative tribometer simulating the pure sliding process in the wheel-rail contact. The Hertzian pressure was maintained at 1,000 MPa with two levels of sliding velocity (20 mm/s and 80 mm/s). This study resulted in five main findings.First, the initial surface topographies seemed to have a significant effect on the friction coefficient independently of the speed. Second, the increase of the sliding velocity would decrease the friction coefficient. Third, especially when accompanied with a high sliding velocity, an initial rough surface would have a significant effect on the wear of the wheel. Fourth, the highest wear values were observed at groove orientations of 45° when accompanied with a high sliding velocity. Finally, the break-in duration seemed to depend on the initial surface topographies of the rail and the sliding velocity.

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“…In line with previous works [24], we can explain this finding as follows. At the beginning of the friction test, only asperities were in contact with the pin.…”

Section: Wear Analysis and Surface Damagesupporting

confidence: 90%

Effect of surface topography with different groove angles on tribological behavior of the wheel/rail contact using alternative machine

Khalladi

Elleuch

2016

Friction

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“…Surface roughness has been found to have an important influence on the wheel-rail contact stresses, see [36]. The roughness makes the contact stresses deviate from the Hertzian smooth distributions and very high local contact pressures will occur and cause local plastification.…”

Section: Influence Of Roughnessmentioning

confidence: 99%

“…This deformation is believed to be one of the major mechanisms behind rail fatigue. In [36] the roughnessinduced stress field and its consequences are being analysed by computations, twin-disc experiments and field observations.…”

Section: Influence Of Roughnessmentioning

confidence: 99%

“…A demonstration example shows that an increase of the axle load from 25 tonnes to 30 tonnes would increase the vertical profile change by 27 % and the index for rolling contact fatigue by 10 %. In [82] the roughness-induced stress field and its consequences are being analysed by use of computations, twin-disc experiments and field observations. After many overrollings very high plastic deformations will occur in a layer near to the surface which, however, has only a thickness of a few tens of micrometers.…”

Section: Fatigue Life Modelsmentioning

confidence: 99%

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Introduction to the damage tolerance behaviour of railway rails – a review

Zerbst¹,

Lundén

Edel

et al. 2009

Engineering Fracture Mechanics

175

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Despite substantial advantages in material development and in periodic non-destructive inspection together with periodic grinding and other measures in order to guarantee safe service, fatigue crack propagation and fracture is still in great demand as emphasised by the present special issue. Rails, as the heart of the railway system, are subjected to very high service loads and harsh environmental conditions. Since any potential rail breakage includes the risk of catastrophic derailment of vehicles, it is of paramount interest to avoid such a scenario. The aim of the present paper is to introduce the most important questions regarding crack propagation and fracture of rails. These include the loading conditions: contact forces from the wheel and thermal stresses due to restrained elongation of continuously welded rails together with residual stresses from manufacturing and welding in the field, which is discussed in Section 2. Section 3 provides an overview of crack-type rail defects and potential failure scenarios. Finally the stages of crack propagation from initiation up to final breakage are discussed.

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“…On the other hand, elastic-plastic stress analysis of asperity contact has revealed the high degree of contact stress on the wheel/rail interface in terms of surface roughness 1) . For instance, in cases where von Mises stress surpasses the shear yield stress of rail materials, plastic deformation may take place and cause cracks due to ratcheting and other factors.…”

mentioning

confidence: 99%