Effect of Liquid Nitrogen Cooling and Heating on Mechanical Properties and Acoustic Emission Characteristics of Coal

Figure 10

Loading-count-cumulative count and loading-energy-cumulative energy diagram of coal sample 1.

(a) Untreated

(b) 3 cycles

(c) 5 cycles

(d) 7 cycles

(e) 9 cycles

(f) 15 cycles