Progressive Failure Behavior: Energy Evolution and Self-Inhibition in Mining-Stressed Coal with Borehole-Cracked Fractures.

The total energy at the peak point decreases and then increases with the increase of the crack angle, and compared with 0°, the initial development crack angles of 30°, 45°, 60°, and 90° decrease by 23.5%, decrease by 35.3%, increase by 82.4%, and increase by 117.6%, and it can be seen that 45° is the dividing point, the total energy input to the specimen is in a decreasing trend from 0° to 45°, and the conversion rate of elastic strain energy is above 80%.

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The total energy input to the specimen shows an increasing trend from 45° to 90°, but the elastic strain energy conversion rate fluctuates more.

also in 63,971 other papers