Table 6.

Impact strength of samples.

Sample IDs	Control factors			Impact energy (J)	Impact strength (kJ/m2)
	A	B	C
S1	Line	75	100	0.38	7.48
S2	Line	80	200	0.45	8.86
S3	Line	85	300	0.51	10.04
S4	Triangle	75	200	0.66	12.99
S5	Triangle	80	300	0.58	11.42
S6	Triangle	85	100	0.76	14.96
S7	Concentric	75	300	0.96	18.90
S8	Concentric	80	100	1.37	26.97
S9	Concentric	85	200	1.14	22.44