Analysis of Material Surface Erosion Characteristics Due to Rhomboid-Shaped Particle Impact

Based on the ejection test device, the dynamic process of a single rhomboid-shaped particle impact metal surface under different incident conditions was captured by a high-speed camera. Meanwhile, the FEM-SPH coupled numerical model of rhomboid-shaped particle impact material surface was established based on the experimental process. The parameters of numerical model were optimized by comparing experimental phenomena with simulation result. Finally, the kinematic behavior of the rhomboid-shaped particles and the predicted deformation crater profile in many working conditions such as critical impacts, initial rotation and overlapping impacts of the particles were further analyzed by the coupled numerical model. The results showed the coupled numerical model can capture the generation and evolution of metal surface crater accurately during erosion wear, and can record the incident behavior and rebound trajectory of particles in detail. The error of particle rebound velocity and rebound angle were all within 14%. Under the critical impact conditions, the particle kinetic energy loss was the largest; the higher the impact angle, the less the residual kinetic energy of particle. Initial rotation of the particles changed their rebound kinematic behavior and failure mechanism of the metal surface materials. The mechanism of overlapping impacts of particles on material surface was closely related to the incident conditions of subsequent particles, and the model successfully captured two special phenomena of deepening and reducing of the material damage caused by overlapping impacts. © 2020, Science Press. All right reserved.