Fig. 22. Structure of the chair.
After all the pieces were made in the composite material with
fique fiber, the imperfects present on the surface were
eliminated, using 400 and 600 grit sandpaper.
The assembly of the different parts of the chair was carried
out using a 2” self-drilling screw. Fig. 23 shows the chair
manufactured.
Fig. 23. Manufactured chair.
IV. CONCLUSIONS
The tensile stress and modulus of elasticity of the composite
materials increased with the greater quantity of fibers used, this
due to the stiffening of the material, presenting a maximum
stress of 27.30 MPa and a maximum modulus of elasticity of
0.725 GPa, in the composite material with five layers of fique
fiber (24.9% by weight of the composite).
Likewise, the mechanical properties to flexion of the
composites increased with the insertion of the fiber of fique, the
highest stress obtained being 22.65 MPa with a flexural
modulus of 1.22 GPa in the composite with five layers of fiber
of fique.
The mechanical characterizations showed that the most
suitable material for the manufacture of the back, seat and
armrests of the student chair was the five layers of fique fiber.
On the other hand, the morphological analysis with optical
microscopy allowed observing a good adhesion between fique
fiber and polyester matrix.
With the analysis of finite elements, it was proved that the
chair could support the design load of 100 kg-f since the efforts
generated in the simulation are lower than those obtained in an
experimental way.
A student chair in reinforced composite with five layers of
fiber was manufactured by means of the Hand Lay Up
manufacturing technique, giving an application to the material
of an industrial type.
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