Research on Impact Stress Transfer Characteristics of Lunar Rock Coring Drill

Table 1

Constant parameters used in the transmission analysis of impact stress on drill.

Parameters	Symbols	Numerical value	Unit
Input impact energy	WP	0.8∼4	J
Percussive frequency	fP	0∼20	Hz
Anvil length	LD	230	mm
Drill stem length	LA	2600	mm
Length of the drill bit	LB	46	mm
Outside diameter of the drill stem	DAo	31	mm
Drill stem inner diameter	DAi	25.5	mm
Cross-sectional area of the drill stem	AD	189	mm^2
Materials	Steel grade 45
Elastic modulus	E	210 × 109	N·m^−1
Density	ρ	7850	kg·m^−3