Rebound characteristics for the impact of SiO2 particle onto a flat surface at different temperatures

• The capture velocity decreases for larger particle size.
• The capture velocity increases for higher surface temperature.
• The viscoelasticity is more significant for smaller Young's modulus of surface.

A dynamic model has been developed to simulate the normal impact of micro-sized SiO2 particle onto a flat surface at different experimental temperatures. The model describes the impact process through the combination of the static contact theory proposed by Brach et al. and energy dissipation considering both adhesion effect and viscoelastic effect. The present paper focuses on the effects of particle size, incident velocity, temperature, and damping coefficient on the particle/surface collisions. The model is verified by comparing the predicted critical velocities with the experimental results. Specifically, temperature and damping coefficient were treated as variables except for particle size and incident velocity. The influences of the contact force and the contact displacement on the contact time were also analyzed. It is found that both adhesion effect and viscoelastic effect increase with increasing surface temperature, which leads to the increase of critical velocity.

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