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Plastic ratcheting plays a key role in wear and rolling contact fatigue crack formation at the wheel–rail interface. Tests to examine the wear and rolling contact fatigue behaviour of rail materials over a wide range of service conditions are expensive and can be impractical. A physical simulation of the deformation behaviour associated with ratcheting is an attractive replacement for such tests....
Fluid penetration of cracks has been regarded as an important mechanism of crack growth for inclined surface breaking cracks under contact loading since the 1930s. However, there are only limited cases in which it is realistic to assume fluid is sealed in and pressurised by wheels crossing cracks of complex three-dimensional morphology in rolling contact fatigue affected rail. To investigate, modelling...
The quality of rail steel has improved greatly in recent years and the material is more resistant to wear, plastic deformation and crack initiation; but track forces have also increased, and cracking of rails is a major concern. Different steel microstructures have different wear and rolling contact fatigue (RCF) behaviours when subject to cyclic, rolling–sliding, compressive contact. In order to...
Material in railway rails is loaded repeatedly by the passage of the wheel. The maximum contact pressure which the material can carry elastically in the steady state is known as the 'shakedown limit'. With an operating contact pressure below the shakedown limit the rail would be expected to remain elastic with a very long life. However, examination of rail cross-sections shows severe plastic deformation...
This study is aimed at the deterioration of rolling contact fatigue (RCF) life of pearlitic rail steel, under rolling-sliding conditions, where the wet phase of the test is preceded by different numbers of dry cycles. It is shown that initial dry cycles above a critical number causes sudden and significant deterioration in RCF life. This effect has been explained using the argument of plastic strain...
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