Research on Particle Size and Energy Consumption Law of Hard Coal Crushing under Impact Load Based on SHPB Test

To study the particle size distribution and energy variation law of hard coal under a load, an impact compression test specimens different loading conditions was carried out using Φ50 mm diameter Separate Hopkinson Press Bar (SHPB) system. We implemented theory dynamic rock to establish calculation expression crushing dissipation, we established Weibull model body analyze velocity in relation consumption. The results demonstrate that due original states specimens, damage static action is mode conjugate plane shear damage, single bevel tensile damage. process specimen load divided into three stages: elastic deformation, elastic–plastic plastic softening, while increase strain rate caused peak stress increase. can characterize very well. parameter degree power function influenced by velocity; greater velocity, higher degree, but characteristic index fluctuates with velocity. As increases, incident reflected linearly, transmitted increases first then decreases. dissipation also linearly There no obvious regular change between during dissipated macroscopic only accounts for 10~20% energy; most used damping loss loss.