[Retracted] Multiobjective Optimization of Mechanical Properties on Sisal-Glass Fiber-Reinforced Hybrid Composites Using Response Surface Methodology and LINGO Analysis

Table 3

Design matrix and average results of mechanical properties.

Run order	Std. order	Vol.% of sisal X1	Vol.% of epoxy resin X2	Tensile strength (MPa)	Flexural strength (MPa)	Impact strength (J)
1	4	−1	0	27.62	134.65	4.20
2	9	0	0	31.89	161.34	3.40
3	7	0	+1	27.59	133.84	3.51
4	5	+1	0	27.09	127.91	2.75
5	6	−1	+1	23.92	111.06	4.00
6	1	−1	−1	23.78	103.21	4.30
7	8	+1	+1	21.98	100.83	2.75
8	2	0	−1	28.50	131.19	3.50
9	3	+1	−1	25.06	104.59	2.58