The Impact Toughness and Hardness of Treated and Untreated Sisal Fibre-Epoxy Resin Composites

Table 1

Values of impact toughness for pure epoxy as well as treated and untreated sisal fibre-epoxy resin composites.

Weight % of the reinforcing fibre	Impact energy of untreated sisal fibre-epoxy resin composites			Impact energy of treated sisal fibre-epoxy resin composites			% increase of impact energy
	Range (joules)	Average (joules)	Coefficient of variation (%)	Range (joules)	Average (joules)	Coefficient of variation
Epoxy (0)	0.54–1.22	0.84 ± 0.24	28.33	0.54–1.22	0.84 ± 0.24	28.33	—
5	0.81–1.89	1.14 ± 0.29	25.47	1.63–2.44	2.14 ± 0.29	13.48	28.09
10	2.30–2.71	2.50 ± 0.12	14.86	1.08–4.75	2.96 ± 0.93	31.59	20.07
15	1.36–4.61	3.47 ± 0.86	24.81	2.03–5.56	3.96 ± 0.84	21.32	14.06
30	5.28–7.86	6.54 ± 0.67	22.45	6.34–8.15	7.55 ± 0.67	25.47	15.44
50	8.76–11.74	10.34 ± 0.74	18.44	10.77–13.15	12.65 ± 0.82	25.22	22.34