Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading

Table 3

Crack propagation process of Specimen c3 at the loading rate of 11.4 m/s.

High-speed images	Crack sketch	Stress (MPa)	Loading time (μs)	Crack propagation process
		26.74; Prepeak	52.6	Cracks propagating to the left and right directions occurred from the vertex of the prefabricated fracture of specimen
		34.38; At peak	101.2	Cracks further propagated to two ends, and cracks occurred on the right-end face of the specimen
		23.73; Postpeak	121.0	Cracks propagating from the vertex of the fracture had increased width and connected through the specimen, and cracks covered up the two end faces of the specimen