Research Article
Effect of Pre-Existing Symmetrical Cracks on Propagation Behaviors of a Blast-Induced Crack
Figure 9
The voltage signal recorded by CPGs and its derivative. (a) S = 40 mm. (b) S = 60 mm. (c) S = 80 mm. (d) No existing parallel cracks.
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| (b) |
| (c) |
| (d) |