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

<div>Acoustic emission energy counting rate under the same confining pressure and stress level and different cyclic loading frequency. (a) MB-3, 0.25 Hz and (b) MB-4, 0.5 Hz.</div>

Advances in Materials Science and Engineering

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Figure 10

Figure 10: Experimental Research on Acoustic Emission Characteristics and Felicity Effects during Coal Fatigue Failure under Cyclic Loading 