To investigate energy dissipation and particle size distribution of rock under dynamic loads, a series of dynamic compression tests of granite specimens were conducted using a conventional split-Hopkinson pressure bar (SHPB) device with a high-speed camera. The experimental results show that the dissipated energy increases linearly with an increasing incident energy, following two different inclined paths connected by a critical incident energy, and the linear energy dissipation law in the dynamic compression test has been confirmed. This critical incident energy was found to be 0.29–0.33 MJ/m³. As the incident energy was smaller than the critical incident energy, the rock specimens remained unruptured after the impact. When the incident energy was greater than the critical incident energy, the rock specimens were ruptured or fragmented after the impact. In addition, the experimental results indicate that the dissipated energy and energy consumption ratio of a rock specimen, either unruptured or fragmented, increase with an increasing strain rate. Furthermore, it was found that fragment sizes at each mesh decrease with an increasing incident energy; that is, fragmentation becomes finer as incident energy increases.

中文翻译：

---

SHPB压缩试验中不同入射能量下花岗岩的能量耗散和粒度分布

为了研究岩石在动态载荷下的能量耗散和粒径分布，使用带有高速摄像机的常规分体式霍普金森压力杆（SHPB）设备对花岗岩样品进行了一系列动态压缩试验。实验结果表明，随着临界入射能量的连接，两条不同的倾斜路径之间的耗散能量随着入射能量的增加而线性增加，并证实了动态压缩试验中的线性能量耗散规律。发现该临界入射能量为0.29–0.33 MJ / m ³。由于入射能量小于临界入射能量，因此冲击后岩石样品仍保持不破裂。当入射能量大于临界入射能量时，岩石试样在撞击后会破裂或破碎。另外，实验结果表明，未破裂或破碎的岩石样品的耗散能量和能量消耗比随应变率的增加而增加。此外，发现随着入射能量的增加，每个网格的碎片尺寸减小；即，随着入射能量的增加，碎片变得更细。