This paper presents a numerical investigation to describe ratchetting behaviour in rail steel under cyclic rolling-sliding contact state. The study numerically quantifies cyclic plastic strain accumulation in rail material. This study combines the Hertzian contact pressure, longitudinal tangential traction based on Carter's theory and heat flux distribution across the contact patch to simulate the wheel-rail contact problem. In the numerical procedure, the effective loading is translated on the rail surface for twelve wheel passes. Temperature dependent cyclic plasticity material model of Chaboche featuring non-linear kinematic hardening is employed that simulates the ratchetting behaviour of the rail material. Results are extracted in terms of plastic strain and stress-strain response. These results are able to augment the understanding of failure mechanisms in rail material that arise from friction based thermo-mechanical load at the dynamic wheel-rail contact interface. The knowledge evolved can provide useful information to the development and application of rail steels and the development of effective rail maintenance strategies in order to mitigate rail material degradation.
Srivastava, J. P., Kiran, M. V. R., Sarkar, P. K., & Ranjan, V. (2017). Numerical Investigation of Ratchetting Behaviour in Rail Steel under Cyclic Rolling-Sliding Contact. In Procedia Engineering (Vol. 173, pp. 1130–1137). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2016.12.079