An approximate model to predict near-surface ratcheting of rails under high traction coefficients

作者：Trummer G^*; Six K; Marte C; Dietmaier P; Sommitsch C

来源：Wear, 2014, 314(1-2): 28-35.

DOI：10.1016/j.wear.2013.11.019

• Plasticity
• Ratcheting
• Rolling contact fatigue
• Railway rails
• Wear
• Computer simulation

A model to predict the ratcheting behavior of the near-surface material layer under high traction coefficients has been developed. The model explicitly takes into account the longitudinal, lateral and spin creep in determining the displacement increment at the surface due to plastic shear deformation. The model is computationally efficient and allows to perform plasticity calculations based on results from multi-body system simulations. %26lt;br%26gt;The approximate model has been validated with results from finite element simulations and calibrated for R260 rail steel with data from twin disc tests. In addition, a parametric study has been performed to show the model behavior as a function of creep, in which the interaction with wear as an independent mechanism is taken into account. Application of the model to results of multi-body system simulations of the metro system in Vienna shows that the prediction of the crack pattern at the rail surface is feasible with the chosen approach.

• 出版日期2014-6-15