Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre-Existing Flaws

<div>Geometries of different types of crack systems: (a) forward echelon crack system, (b) inverse echelon crack system, (c) two parallel cracks, (d) three parallel cracks, and (e) crack system with barrier cracks.</div>

Advances in Civil Engineering

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Figure 6

Figure 6: Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre-Existing Flaws 