Single Particle Impact Crushing Simulation and Establishment of Specific Fracture Energy Model

Abstract

Based on the JH-2 constitutive model, a UFLC particle collision simulation model was established, the dynamic collision process of two particles on the UFLC platform was analyzed, and the failure forms of particles with different diameters under different impact velocities were analyzed. On this basis, based on the impact velocity model and the force-displacement model, an empirical expression for the specific fracture energy of different particle sizes was established, which provided a method for determining the undetermined coefficients of the statistical model of the specific fracture energy during the collision of titanium dioxide particles. The study found that the law of the change of the specific fracture energy with the particle diameter given by the established ultrafine particle collision finite element simulation model during collision is consistent with the law given by Tavares' experimental model, which verifies the accuracy of the model.