Influence of kinematic parameters and rock properties on the cutting process with ODC based on discrete element method

This study investigates the effects of kinematic parameters and rock properties on the cutting performance of an oscillation disc cutter (ODC) based on the discrete element method. The cutting model with ODC is established using the particle flow code in three dimensions (PFC3D) and validated by experiments. Through simulation analysis, the influence of geometric parameter (eccentric ratio, R_E), motion parameters (velocity ratio, R_V) and rock characteristics on cutting crushing characteristics, cutting force and cutting efficiency is analyzed. The simulation results reveal that mean cutting force, mean torque, and specific energy (SE) increase with R_E and R_V. The mean cutting force and mean torque are positively correlated with the cutting depth and have a good linear relationship, while SE is negatively correlated with the cutting depth. Furthermore, the study demonstrates that as the cutting depth increases, the fracture mode of the rock transitions from plastic to brittle. Meanwhile, the peak cutting force occurs during the crack initiation stage and subsequently decreases during crack propagation. Finally, the multivariate regression equations of rock mechanical properties, cutting depth and SE are obtained. These findings enhance the understanding of the cutting mechanism of ODC, and provide a theoretical foundation for ODC parameter design in practical applications.