This research includes an experimental study for the manufacture of
a composite material based on polymer (unsaturated polyester),
reinforced with random fiberglass at different weight fractions. By
suite, it has been studied some mechanical prope
rties of the models
manufactured, to determine the effect of glass fiber content on the
tensile strength, hardness and impact resistance. This study has
shown that the best results were for samples reinforced by 40%
fiberglass, where the tensile strength increased about 70%, hardness
up to 30%, and impact resistance about 43%. It will be observed
that the mechanical properties decrease clearly at 60% of weight
fraction of fiberglass. This fact can be related to the quantity of
unsaturated polyester become inadequate for recharge of the fibers,
which leads to weakness in the forces bonding in composite
materials.
As a result of the development of the use of reinforced Composites with fibers in
practical applications continuously, research aims to study the effect of proportion piroxide
additives to unsaturated polyester resin on the tensile properties of th
e samples prepared
from unsaturated polyester resin reinforced with glass fiber used in wind turbine blades
manufacturing, and also studying the effect of for the application of heat treatment
operations on the hardening of the unsaturated polyester and tensile properties after heat
treatment process the application in order to improve the properties of these blades.
Test samples were prepared containing ratios (1% - 1.5% - 2%) of methyl Etel
ketone piroxide MEKP and test results showed that the best ratio at 1.5%. While the heat
treatment results showed that the best values for tensile strength at break of the samples are
treated to a time of / 48 hours /.
This research aims to study the effect of adding inorganic waste (Marble powder -
glass powder) on the volumetric and longitudinal shrinkage curves at unsaturated polyester
resin, tests showed that samples exposed to volumetric and longitudinal shr
ink and
occurrence of consecutive gradients in volumetric shrinkage values. Whatever the ratio of
the added materials (marble powder - the glass powder) will effect the behaviour of the
unsaturated polyester hardening, that means it will effect the volumetric shrinkage.
It is necessary to study the volumetric and longitudinal shrinkage values because
they affect the product size to be dealt with, this value should be taken into account in the
design so that should be added this amount of volumetric shrinkage to the dimensions to
designed templates in order to avoid potential variations occurring in the final product.
Preliminary results showed that the value of volumetric shrinkage got up (5%) and the
curves tend to stability, almost three weeks after the initial hardening incident.
This search aims to study the effect of additive materials ( Ethyl Methyl Keton
Peroxide MEKP , Cobalt Naphthenate ) at the important values of (stress-strain) curves
( stress and elongation at break ) for the preparing specimens from reinforced an
d nonreinforced
with fiber glass unsaturated polyester resin.
The result showed that the investigated parameters are clearly affected with using
additive materials and the optimum concentration for non-reinforced specimens which was
curing in room temperature was (1% MEKP + 1% Cobalt Naphthenate) and (0.8% MEKP
+ 1% Cobalt Naphthenate), and for reinforced specimens with fiber glass was:( 1% MEKP
+ 0.8% Cobalt Naphthenate) and ((0.2-0.4) % MEKP + 1% Cobalt Naphthenate).
The results showed also that it is possible to get the better values of tensile stress at
break when the specimens was curing in oven at 100 Cº and treated at this temperature for
15 min.
In this study, we have investigated the water absorption behavior of unsaturated
polyester /wood flour wastes composites materials. To achieve that, specimens were
prepared by using compressing method with different ratio of polymer matrix with org
anic
wastes produced from carpentry workshop (wood flour).Density of produced panels has
been measured and the obtained results showed that there is an ability to produce
hardindustrial wood panels. Practical experiments had been achieved to determine the
percentages of water absorption. Absorption test was achieved on the cut specimens by
immersing them in natural water (un-distilled) and measuring the gained weight of
specimens and the resulted swelling to determine the final changes in the product. Through
this study, we find that the absorbability has increased with the increment of organic filler
ratio and the practices sizes increment. In addition, we also find that the absorption
behavior follow Fickian law of diffusion in most specimens. We calculated the diffusion
coefficient D and other parameters of diffusion process and we also plotted the associated
plotsof the absorbability results. The obtained results showed that there is an ability to
produce planes of industrial wood without any pretreatment of wood flour.
