3.4. Scanning electron microscopy (SEM) analysis
The surface characteristics of the composite material used for
the investigation is studied through scanning electron microscopy.
The cross sectional view of the fabricated composite material consisting
of sisal + jute + GFRP is presented in Fig. 15.
The Scanning Electron Microscope (SEM) images are taken to
observe the interfacial properties, internal cracks and internal
structure of the fractured surfaces of the composite materials. All
the specimens are coated with conducting material before observing
the surfaces through SEM. The scanning electron image observed for the sisal–jute–GFRP composite material subjected to
tensile test is presented in Fig. 16.
Fig. 16 shows the fractured surface, void formed and discontinuity
in the specimen. Fig. 17 shows the SEM image for the sisal–jute–GFRP
composite material which subjected to flexural
test. The figure shows the fracture in the fiber bundle and incomplete
distribution of the fiber and matrix in the composite material.
The SEM image for the Jute–GFRP composites material which
subjected to tensile load is presented in Fig. 18. Figure clearly
shows the breakage of fibers in the composite materials.
The SEM image for the sisal–jute–GFRP composite material
which subjected to impact test is presented in Fig. 19. During the
impact of the specimen, the composite material is disintegrated
in the breaking point and is shown in figure.