Abstract
The railroad industry perpetually increases the wheel loads used by freight traffic to enhance cost effectiveness. One drawback of the increase in wheel loads is the subsequent increase in the quantity of fatigue defects induced near the top surface of the rail in the region known as the railhead. In particular, the occurrence of horizontal cracks located about 6 to 7 mm (1/4 inch) below the surface of the rail has increased. The horizontal cracks are referred to as shell defects or shells. Shells grow in fatigue driven by the live contact shear stress that occurs at this depth as well as vertical residual stresses that are tensile at this depth. The shells are considered benign in nature since they do not directly cause rail failure. However, the shells may grow out of the horizontal plane to form vertical detail fractures that can lead to rail failure. The initiation of detail fractures is of interest because they are potentially failure causing whereas shelling is comparatively benign. The schematic of wheel/rail contact in Figure 2.1 describes the location of shells and detail fractures [[2.1]].
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© 1992 Springer Science+Business Media Dordrecht
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Farris, T.N., Xu, Y., Keer, L.M. (1992). Some factors influencing the transition from shelling to detail fracture. In: Orringer, O., Orkisz, J., Świderski, Z. (eds) Residual Stress in Rails. Engineering Applications of Fracture Mechanics, vol 12-13. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1787-6_2
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DOI: https://doi.org/10.1007/978-94-011-1787-6_2
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