3.2. Flexural properties
Fig. 9 shows the sample graph of flexural strength observed for
the sisal–jute–GFRP composites. The result indicated that the displacement
increases with the increase of applied load up to around
3000 N, after that, it tends to decrease, i.e., breaking takes place.
The maximum displacement observed is 14.2 mm. Fig. 10 shows
the load vs the displacement graph for different composites tested.
The results indicated that the displacement increases with the increase of load. After the 14.2 mm displacement, there is a breaking
exist. The results indicated that sisal–jute–GFRP shows better
result than the other type of composites tested.
The stress strain curve observed for sisal–jute–GFRP composites
specimen is shown if Fig. 11. The result indicated that the strain increases
proportional up to 13 N/mm2 after that it tends to reduce.
The breaking occur after the strain rate of 35.8. The comparative
evaluation of the stress strain rate observed for flexural/compression
test is presented in Fig. 12. From the graph, it has been
noticed that sisal–jute–GFRP composites is performing well when compared to other types composites tested followed by jute–GFRP
composites.
The average values observed for different composites is presented
in Fig. 13. From the figure, it is asserted that the sisal–
jute–GFRP composites flexural load carrying capacity is better than
other composites tested. Sisal–jute–GFRP composites are capable
of taking of the flexural loan up to 3 kN whereas jute–GFRP composites
are capable of taking only 2.1 kN. The sisal–GFRP composites
shows the performance in between jute–GFRP composites and
sisal–jute–GFRP composites and are capable of taking the flexural
load up to 2.3 kN.