Dynamic contact modeling considering local material deformation by grit indentation for abrasive belt rail grinding

During the operation of the railway system, various defects that occurred on the rail surface significantly affect the service life of the rail and undermine the stability, safety, and passenger comfort of the train. For this problem, abrasive belt rail grinding (ABRG) has obtained increasingly rapid development for the daily rail maintenance due to the merits of efficient grinding, elastic grinding, and cold grinding. In the process of ABRG, the contact behavior between the abrasive belt and rail is the main factor for material removal. However, current researches on contact behavior concentrated in the contact area and pressure distribution under the static state having ignored the role of dynamic abrasives when considering material deformation. Therefore, this paper proposed a mechanical model of single and multiple grits grinding for ABRG based on local material deformation induced by grit indentation, in which the credibility of the model was verified by the dynamic contact simulation based on the particle hydrodynamics-finite element method (SPH-FEM).