[Retracted] Optimizing the Parameters of Zirconium Carbide and Rice Husk Ash Reinforced with AA 2618 Composites

Table 3

Input factors and their levels.

Level units	Reinforcement wt%	Speed (m/min)	Feed (mm/rev)	Depth of cut (mm)
−1	0	190	0.2	1
0	10	210	0.4	1.5
+1	20	230	0.6	2