This
work focuses on the preparation of polymer matrix composite
specimens by (Hand Lay-Up) method to make bulletproof armor from
the unsaturated polyester resin (UP) as a matrix reinforced by
Kevlar fibers at different volume fractions with and without
(3%) of Al 2 O 3 powder. The tensile test was performed for
these composite specimens which include: (modulus of elasticity,
tensile strength and elongation percentage), in addition of
ballistic test were studied. The results of this work show that
the values of tensile test increase with increasing the volume
fraction of fibers. And the values of tensile test of a
composite reinforced by kevlar fibers and addition (3%) of Al 2
O 3 powder was less than those composite without addition of Al
2 O 3 powder. The numerical method based on FEM was used to
analysis of the bullet proof armor ballistic test of the
composite specimens by finding the values of stresses, strains
and deformations. The numerical results that obtained from the
program (ANSYS 14.5) represent the maximum value of stress
happened to the composite specimens when reinforced by eight
layers of the kevlar, and vice versa to the deformations and
strain also the numerical results shown a good agreement with
results that were obtained experimentally. Results of ballistic
test of composite specimens show the volume fraction of fibers
has an effect on the deformations of the front face and back
face of these composite specimens. And the values of the
ballistic test for the composite reinforced by kevlar at eight
layers give the best values from other each of composite
specimens. |