Analysis and Testing of Load Characteristics for Rotary-Percussive Drilling of Lunar Rock Simulant with a Lunar Regolith Coring Bit

Table 2

Characteristic parameters in the rotary-percussive drilling load prediction model for lunar rock simulant.

Rock material	Marble
Cohesion	24.2 MPa
Inner friction angle	41.8°
Indentation hardness	1080 MPa
Friction angle between rock fragments and parent rock	32.2°
Angle between dense core and cut fracture	60°
Contact rigidity between hammer and tool post	20 kN/mm
Contact rigidity between cutting blade and rock	21 kN/mm