Electrical Discharge Machining of Al (6351)-5% SiC-10% B₄C Hybrid Composite: A Grey Relational Approach

Table 4

Grey relational analysis.

Ex. number	𝑆/𝑁 ratio (EWR)	𝑆/𝑁 ratio (SR)	𝑆/𝑁 ratio (PC)	Normalized value (EWR)	Normalized value (SR)	Normalized value (PC)	GRC (EWR)	GRC (SR)	GRC (PC)	GRG
1	12.43	−14.79	−8.49	0.96	0.89	0.07	0.93	0.82	0.35	0.70
2	12.10	−13.14	−6.56	0.96	1.00	0.34	0.93	1.00	0.43	0.78
3	10.62	−16.23	−7.23	0.94	0.77	0.25	0.90	0.69	0.40	0.66
4	6.75	−15.31	−8.62	0.89	0.85	0.05	0.82	0.77	0.34	0.64
5	5.92	−15.38	−8.94	0.87	0.84	0.00	0.80	0.76	0.33	0.63
6	7.86	−15.83	−6.76	0.91	0.81	0.31	0.85	0.72	0.42	0.66
7	12.43	−14.55	−8.16	0.96	0.90	0.12	0.93	0.84	0.36	0.71
8	17.20	−16.09	−8.13	1.00	0.79	0.12	1.00	0.70	0.36	0.68
9	14.28	−16.40	−4.71	0.98	0.76	0.55	0.96	0.67	0.52	0.72
10	−8.24	−18.28	−4.40	0.19	0.58	0.58	0.38	0.54	0.54	0.49
11	−7.76	−17.83	−6.52	0.24	0.63	0.34	0.39	0.57	0.43	0.46
12	−6.87	−16.78	−6.60	0.32	0.73	0.33	0.42	0.64	0.43	0.50
13	−5.54	−17.98	−5.93	0.42	0.61	0.42	0.46	0.56	0.46	0.49
14	−4.65	−19.19	−6.19	0.48	0.48	0.38	0.49	0.49	0.45	0.47
15	−4.79	−17.87	−6.06	0.47	0.62	0.40	0.48	0.57	0.45	0.50
16	−1.06	−17.71	−5.34	0.67	0.64	0.48	0.60	0.58	0.49	0.56
17	1.08	−19.57	−5.43	0.75	0.43	0.47	0.67	0.46	0.48	0.54
18	0.47	−18.39	−4.24	0.73	0.57	0.60	0.65	0.53	0.55	0.58
19	−10.05	−18.56	−4.86	0.00	0.55	0.53	0.33	0.52	0.52	0.46
20	−9.53	−18.64	−4.29	0.06	0.54	0.59	0.34	0.52	0.55	0.47
21	−8.39	−18.89	−2.60	0.18	0.51	0.74	0.37	0.50	0.66	0.51
22	−7.96	−20.02	−3.34	0.22	0.37	0.68	0.39	0.44	0.61	0.48
23	−6.72	−19.34	−3.46	0.33	0.46	0.67	0.42	0.48	0.60	0.50
24	−6.87	−19.77	−2.92	0.32	0.40	0.71	0.42	0.45	0.63	0.50
25	−5.75	−19.03	−2.67	0.40	0.49	0.73	0.45	0.49	0.65	0.53
26	−5.33	−22.15	−0.98	0.43	0.05	0.86	0.47	0.34	0.78	0.53
27	−5.20	−22.49	1.41	0.44	0.00	1.00	0.47	0.33	1.00	0.60