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300
S2 G2/J3/G2
250 S5 [G/J]3G
S7 G7
S9 J7
Tensile strength (MPa) 150
200
100
50
0
0 0.004 0.008 0.012 0.016
Tensile strain
Figure 4.3 Comparison on the tensile stress-strain curves between E-glass/jute, E-
glass and jute laminates
The comparison between the tensile properties of E-glass/flax, E-glass and flax
laminates is illustrated in Figure 4.4. The curves pattern is similar to what observed on
the E-glass/jute (Figure 4.3), where the G7 shows the highest tensile properties while
the F7 laminate shows the lowest. The presence of E-glass in G2/F3/G2 and [G/F]3G
hybrid laminates contributes to the increase of about 56.6 % of the tensile strength, in
comparison to the F7. Meanwhile, in previous study by Baets et al. [154] showed that
the flax fibres are able to reach the stiffness about 70 GPa and the specific stiffness is
even higher compared to the glass under the optimal design of weaving pattern, which
is opposed to the result of the present study. As shown in Table 4.3, the specific
stiffness of G7 is higher than F7 and such contrasting result could be due to the diverse
types and parameters of flax used in terms of fibre arial weight, weaving style and
orientation.
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