Table 6 Number and proportion of different types of cracks.

From: Research on the mechanism of coal wall fragmentation and dust production characteristics in the perspective of differentiated discrete elements

Rotational speed of roller

(r/min)

Total number of cracks

Number of tensile cracks

Proportion of tensile cracks

Number of shear cracks

Proportion of shear cracks

35

10,600

8060

77.08

2510

22.92

50

10,864

8357

76.95

2507

23.05

65

11,100

8550

76.39

2540

23.61

80

11,200

8550

76.27

2640

23.73

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