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

Table 3

Maximum peak load and load ratio data of untreated and liquid nitrogen cycles in coal 2.

Number of cycles	0.2 F	0.4 F	0.6 F	0.8 F	Maximum peak load ()
Untreated	283.729	567.458	851.187	1134.916	1418.645
3	243.7206	487.4412	731.1618	974.8824	1218.603
5	229.1746	458.3492	687.5238	916.6984	1145.873
7	154.7902	309.5804	464.3706	619.1608	773.951
9	124.7338	249.4676	374.2014	498.9352	623.669
15	100.9184	201.8368	302.7552	403.6736	504.592