Effect of Disturbance Frequency on Cyclic Hardening Behavior and Energy Dissipation of Coal under Cyclic Loads.

As the stress level increases, both the slope and intercept show a decreasing trend, as shown in Figure .

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It can be seen that with the increase of the stress level, the overall slope of each stage has an increasing trend, the area of the overall hysteresis loop is basically the same before the failure, and the area of the hysteresis loop increases sharply when the peak stress occurs and the failure occurs.

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It reversed, and then showed a trend of first falling and then rising.

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