Table 1 Sample parameters.

From: Strength hardening and damage mechanism of semiwetted coal under cyclic loads with different initial stress levels

Sample number

Length (mm)

Diameter (mm)

Weight (g)

Wave velocity (km/s)

I-50

100.12

49.96

242.6

1.83

I-60

100.10

49.94

246.2

1.85

I-70

100.08

49.92

243.6

1.87

UCS-1

100.06

49.96

245.9

1.92

UCS-2

99.96

49.98

242.5

1.87

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