Page 180 - Template Tesis UTM v2.0

Meanwhile in terms of the stacking sequence effects, the G2/B3/G2 exhibits the

higher maximum compressive stress for all tested strain rates in comparison with
-1
[G/B]3G, as shown in Figures 4.32 and 4.33. At the strain rate of 2350 s with fixed
strain of 0.04, the difference between SL and IC sequences of E-glass/basalt is
approximately 39 MPa; the similar trend is observed for hybrid composite of E-

glass/jute in Figures 4.34 and 4.35 and E-glass/flax in Figures 4.36 and 4.37. At the
-1
strain rate of 1125 s with the fixed strain of 0.03, the maximum compressive stress
exhibited by G2/F3/G2 and [G/F]3G are 227 MPa and 188 MPa, respectively. The

-1
hybrid composites of G2/J3/G2 and [G/J]3G at 750 s exhibited the compressive stress
of 156 and 134 MPa, respectively at fixed strain of 0.06. Conversely, the dynamic

failure strain decreases with the increasing strain rates. For instance, the G2/B3/G2
(Figure 4.32) with the fixed dynamic stress of 150 MPa, the maximum dynamic strains

display is approximately 0.0141, 0.091 and 0.0074 mm with the applied strain rates of
-1
850, 1300 and 2350 s , respectively. This suggests that the rapid crack propagation
and fibre’s failure occurring within a very short time have caused the total failure of

the specimens, as stipulated in previous literatures [118].

850/s 1300/s 2350/s
450

400

350

300
Stress (MPa) 250

200

150

100

50
0
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16
Strain

Figure 4.32 Effect of strain rates on the stress-strain curves for the hybrid of
G2/B3/G2

147