Study on Mechanism of Anti-Erosive Damage in High-Speed Train Coatings

Abstract

For the problem of high-speed erosion and wear caused by microfine particles on the surface coatings of rolling stock during operation, the effects of fine particle velocity, incidence angle and particle size on the erosion wear rate of the coatings were conducted using finite element numerical simulation and erosion wear test system. The anti-erosive damage mechanism of polyurethane coatings was analyzed, which was primarily characterized by micro cutting during low angle erosion and brittle fracture mechanism during high angle erosion. Results showed that the erosion wear rate of the coating increased exponentially with particle velocity, which experienced an 87% rise when the velocity changed from 70 m/s to 80 m/s; the coating exhibited characteristics of ductile material erosion wear to a certain extent, with the erosion wear rate reaching a peak value of 0.94 mm3/g at an incidence angle of 15°. Furthermore, the coating exhibited a brittle material crushing and shedding erosion wear mechanism under vertical incidence of different particle sizes. The simulation results obtained from the computational model showed a mere 7% error when compared with experimental validation, indicating that both the model establishment and computational methods possessed high effectiveness. This model could be utilized to simplify or replace experimental approaches, providing a basis for optimizing coating structures in windy and sandy environments.

Keywords

• solid particle erosion|erosion wear rate|finite element calculation|erosion test|erosion morphology