Prediction Model of Drilling Performance for Percussive Rock Drilling Tool

Table 3

Mechanical properties of rock used in impact tests.

Rock specimen	Hwangdeung granite
SC (MPa); ST (MPa); ρr (kg/m^3); Er (GPa)	183; 9.8; 2,680; 42.3; 0.18

S_C: uniaxial compressive strength; ρ_r: density; E_r: Young’s modulus; υ: Poisson’s ratio [17].