SAMPE Journal - May/June 2017 - 22
Feature Article
40, and 60 g/s, while the compression
forces during injection and cure
were both held at 3000 kN. All three
parameter studies were conducted
using the glass fiber, while the carbon
fiber tests are separately reported.
The three studies are summarized in
Table 3.
To analyze the manufactured
plaques, a series of mechanical
characterization
tests
were
conducted. The sample cutout pattern
Table 1. Material properties of selected fibers and matrices.
Table 2. Trial process parameters held constant.
Table 3. Study parameters.
22
is shown in Figure 3. The tension
tests were conducted according to
ISO 527-4 while the flexure tests were
conducted following ISO 14125. The
fiber volume fraction was measured
using the incineration technique
from ISO 7822 while the interlaminar
shear strength measurements were
calculated following ISO 14130. At
least five sample repeats for each test
were performed.
Results and Discussion
As different resin matrices and
different parameter setups were
used, it is imperative to determine
the actual fiber volume content
of the manufactured RTM plates.
Differences in the mechanical
behavior of the manufactured RTM
parts can sometimes also be reduced
to differences in the fiber volume
content. A higher fiber volume
content usually leads to better
mechanical properties, but it also
makes it harder to impregnate the
fibers and to achieve a sufficient fiber
wet-out.
Differences in the fiber volume
content of the various investigated
parameters can be attributed to
different profile thicknesses and
dissimilar amount of entrapped air. It
is particularly important to keep the
thickness constant in order to gain
comparable parts which is easier to
accomplish with a production tool
than the current development tool
that was used.
Figure 4 and Figure 5 present
the flexural data from the first
parameter study examining the
impact of the compression force
during injection. These plots of the
0° and 90° directions respectively
indicate that the compression force
during injection did not impact the
flexural properties. This was also
true for all properties measured as
a function of the compression force
during injection. In fact, no trends
relating to the second parameter
study on the observed mechanical
properties were noticed. Statistically,
neither the compression force during
injection nor the compression load
SAMPE Journal, Volume 53, No. 3, May/June 2017
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