Mechanical Behavior Evolution and Damage Characterization of Coal under Different Cyclic Engineering Loading

Table 1

Fitting results versus relative cycle at different loading frequencies under multilevel cyclic loading.

Frequency (Hz)	Stress level
0.1	1	0.01503	0.14274	0.96593
	2	3.49292-5	0.07178	0.92323
	3	0.02891	0.35445	0.93863
	4	7.41856-6	0.10895	0.85489
0.2	1	0.00435	0.16874	0.89212
	2	5.86179-7	0.07824	0.98289
	3	1.48267-5	0.11724	0.90325
	4	2.57051-5	0.14168	0.92868
0.5	1	0.04693	0.4271	0.91539
	2	0.00738	0.33978	0.97632
	3	0.0071	0.50114	0.98981
	4	0.03939	1.26118	0.75365