Table 3 Material parameter.

From: Analysis of drilling vibration characteristics of anchoring system in coal mine

Material

Density (kg/m3)

Peak stress (Mpa)

Peak axial strain (%)

Young's modulus (Gpa)

Poisson ratio

Old roof

2710.17

94.63

0.646

23.07

0.09

Immediate roof

2238.84

54.45

0.591

18.06

0.16

False roof

2539.16

30.05

0.638

9.19

0.07

42 Cr Mo alloy

7850

930

 

210

0.33

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