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

Figure 11

Load-displacement curves of the specimens with different types of crack systems. (a) Forward echelon crack system. (b) Inverse echelon crack system. (c) Two parallel cracks. (d) Three parallel cracks. (e) Crack system with barrier cracks.

(a)

(b)

(c)

(d)

(e)