Investigation of Fracture Evolution and Failure Characteristics of Rocks under High-Temperature Liquid Nitrogen Interaction

Figure 5

Force-time and AE ringing count-cumulative ringing count and energy-cumulative energy graph with cycle number variation.

(a) Untreated

(b) 3 cycles

(c) 5 cycles

(d) 7 cycles

(e) 9 cycles

(f) 15 cycles

(g) 20 cycles