Research Article
Effect of Liquid Nitrogen Cooling and Heating on Mechanical Properties and Acoustic Emission Characteristics of Coal
Figure 11
Loading-count-cumulative count and loading-energy-cumulative energy diagram of coal sample 2.
(a) Untreated |
(b) 3 cycles |
(c) 5 cycles |
(d) 7 cycles |
(e) 9 cycles |
(f) 15 cycles |