Table 1 Damage mechanical parameters of coal samples.

From: Crack evolution and energy conversion characteristics of coal under acid corrosion conditions

Coal

number

Tensile strength/MPa

Average/MPa

Elastic modulus/GPa

Average/GPa

R-1

2.15

2.54

0.5

0.51

R-2

2.50

0.48

R-3

2.97

0.54

S4-1

1.81

2.03

0.36

0.39

S4-2

2.01

0.4

S4-3

2.28

0.4

S2-1

1.40

1.63

0.33

0.33

S2-2

1.71

0.37

S2-3

1.77

0.29

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