Research Article
Dynamic Fracture Experiment of Fractured Rock under Dynamic Loading
Table 4
Crack propagation process of Specimen a1 at the loading rate of 19.7 m/s.
| High-speed images | Crack sketch | Stress (MPa) | Loading time (μs) | Crack propagation process |
| | | 28.00 Prepeak | 70.5 | White spots began to occur from the vertex of the prefabricated fracture of specimen, and microcracks occurred locally | | | 35.97 At peak | 106.4 | Cracks continued to propagate, and cracks gradually occurred from the ends of specimen | | | 24.67 Postpeak | 147.0 | More cracks occurred from the ends of the specimen, and cracks propagating from the vertex of the prefabricated fracture had increased width |
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