Study on Joint Damage of Double Prefabricated Fragments Penetrating Finite Thickness Concrete

Table 3

Coplanar double fragment orthogonal optimization of four variable three-level variables.

Number	Fragment diameter d (mm)	Fragment velocity (m/s)	Incident angle α (°)	Fragment spacing l (mm)
1	6	1000	0	20
2	8	1500	15	30
3	10	2000	30	40