Numerical Study on Rebound Characteristics and Damage Mechanism of Spherical Multi-Particle Impacting Steel with High Velocity

In engineering equipment, there is a common phenomenon that fine particles collide with key components at high velocity, resulting in reduced equipment life and industrial accidents. In order to understand the erosion performance and rebound characteristics of 1Cr12W1MoV material, a spherical multi-particle impact target was established by ABAQUS/explicit. The finite element model was used to study the effects of particle incident angle, impact velocity and number of impacts on the rebound characteristics and erosion rate of particles hitting the target. The erosion rate, velocity restitution coefficient, tangential velocity restitution coefficient and normal velocity restitution coefficient of the multi-particle impacting target were counted for numerical analysis. The results show that when the particles hit the target at the same impact velocity, the erosion rate increases first and then decreases with the increase of the angle. With the increase of the impact velocity, the maximum erosion rate increases, and the maximum erosion rate corresponds to the angle of incidence decreases. The erosion rate is exponentially related to the erosion velocity. With the increase of the number of collisions, the overall velocity restitution coefficient shows a decreasing trend. The variation trend of the tangential velocity restitution coefficient with the number of impacts is basically similar to that of the total velocity restitution coefficient, indicating that the tangential velocity restitution coefficient plays a decisive role in the response of the target after multiple impacts with different initial impact angles. When the incident angle is 15°, the normal velocity restitution coefficient shows an increasing trend. When the incident angle is 30°, it shows a trend of increasing first and then decreasing. When the incident angle is in the range of 45−85°, the data fluctuation is small, the variation range is within 10%, and the overall change trends to be flattening out.