Page 88 - Template Tesis UTM v2.0
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2.29 to 2.31, it is clearly displayed that the stress-strain curves of the tested specimens
are strain rates dependent. The hybrid composite recorded the intermediate properties
between glass and hemp fibres as shown in Figure 2.31. It is interesting to note that
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hardening rate of glass and hemp are similar up to strain rate of 1376 s . However,
hemp laminate exhibited the lessen rate of hardening with the increasing strain rates
as shown in Figure 2.32. The mute rate hardening in the case of hemp resulting from
the internal failure process occurred at lower stress as well as the nature of natural
fibres from microscopy point of view [109].
Glass
Stress (MPa) (#5) 2133/s
(#3) 1170/s (#4) 1499/s
(#2) 946/s
(#1) 668/s
Strain
Figure 2.29 Stress-strain curves of glass/vinyl ester
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