Experimental Research on Acoustic Emission Characteristics and Felicity Effects during Coal Fatigue Failure under Cyclic Loading

Table 2

Average Felicity ratio of coal samples under cyclic loading.

Coal sample number	Stress level
MB-1	First	0.941	0.892	0.963	0.969	0.988	0.990
	Second	0.872	0.796	0.902	0.867	0.905	0.917
	Third	0.511	0.468	0.637	0.731	0.857	0.893
	Fourth	0.308	0.203	0.402	0.419	0.795	0.809
MB-2	First	0.936	0.899	0.952	0.957	0.979	0.987
	Second	0.869	0.752	0.897	0.871	0.901	0.902
	Third	0.504	0.424	0.559	0.513	0.890	0.883
	Fourth	0.296	0.165	0.371	0.319	0.736	0.815
MB-3	First	0.945	0.837	0.956	0.978	0.981	0.995
	Second	0.867	0.710	0.899	0.886	0.902	0.912
	Third	0.519	0.401	0.637	0.533	0.895	0.894
	Fourth	0.293	0.185	0.373	0.328	0.731	0.806
MB-4	First	0.942	0.862	0.961	0.958	0.987	0.989
	Second	0.870	0.717	0.893	0.867	0.890	0.917
	Third	0.515	0.385	0.560	0.525	0.621	0.893
	Fourth	0.301	0.192	0.372	0.419	0.598	0.818