Research Article
Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre-Existing Flaws
Table 1
Specimens containing different types of pre-existing flaws.
| | Pre-existing flaw types | Tested specimens | Number of specimens |
| | Single pre-existing crack | 0 | 2 (SC0-1, SC0-2) | | 15° | 3 (SC15-1, SC15-2, SC15-3) | | 30° | 3 (SC30-1, SC30-2, SC30-3) | | 45° | 3 (SC30-1, SC30-2, SC30-3) | | 60° | 3 (SC60-1, SC60-2, SC60-3) | | 75° | 3 (SC75-1, SC75-2, SC75-3) | | 90° | 2 (SC90-1, SC90-2) |
| | Pre-existing crack system | Forward echelon crack system | 2 (CSF-1, CSF-2) | | Inverse echelon crack system | 3 (CSI-1, CSI-2, CSI-3) | | Two parallel cracks | 2 (CSTw-1, CSTw-2) | | Three parallel cracks | 3 (CSTh-1, CSTh-2, CSTh-3) | | Crack system with barrier cracks | 2 (CSB-1, CSB-2) |
| | Total number | | 31 |
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