Effect of Particle Overlapping Impacts in Erosion Process

To improve the accuracy of the erosion prediction, it is necessary to consider the influences of adjacent particles in the calculations. Therefore, in the present work Johnson-Cook hardening criterion and Johnson-Cook damage criterion are used in ABAQUS software to study erosion crater morphology and stress distribution on target materials subjected to overlapping impacts of spherical particles. The results show that the impact location of the adjacent particles, which is defined as the horizontal distance between the solid particle impacting spot, can significantly affect the erosion magnitude and pattern. As the horizontal distance between two impacts increases from 0 to 0.6 times the particle diameter, the interaction of the craters gradually decreases. When the horizontal distance is beyond 0.6 times the particle diameter, the interaction between two craters is disappeared. Furthermore, the depth difference between two craters is increased under the impact of adjacent particles. As the impact velocity increases from 14 m/s to 22 m/s, the difference between the depth of two craters is increased from 3.23 μm to 14.7 μm. When the impact angle increases from 25° to 85°, the depth difference between the two craters is increased from 0.11 μm to 14.40 μm. The numerical simulation of erosion process can provide a scientific basis for more elaborate erosion modeling.