Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading

Table 6

Crack propagation process of Specimen b2 at the loading rate of 10.6 m/s.

High-speed images	Crack sketch	Stress (MPa)	Loading time (μs)	Crack propagation process
		33.155; Prepeak	51.0	Microcracks propagating to the lower left part and then to the upper right part occurring from the middle of prefabricated fracture of the specimen
		45.27; At peak	116.3	Cracks continued to propagate from the middle of fracture to the right direction
		32.35; Postpeak	162.6	Cracks continued to propagate with increased width