SAMPE Journal - November/December 2021 - 74

FEATURE / COMPOSITES FROM PREPREGS
Figure 2. Flexural strengths of the PPF composites (a) and the honeycomb core PPF composites (b)
with and without the GF or CF skin layers.
fibers could share a majority of load, and the CF
skin layers could provide a better reinforcement to
the composites than the GF skin layers.
Once the honeycomb cores were incorporated,
strengths of the composites were
the flexural
reduced around 68.2 % to 94.1% comparing to the
strengths of the corresponding PPF composites
(Figure 2b). There are two possible reasons. Firstly,
the inherent mechanical properties of honeycomb
cores were weak due to the cavity structure.
Secondly, the interface for agglutinating between
the honeycomb cores and the top and bottom
prepregs was limited. Hence, the honeycomb
core PPF composites bore less strengths. The
combination of the GF and CF skin layers also
enhanced the flexural strengths, but the elevation
ratios were lower than the efficacies on the PPF
composites without honeycomb cores.
As shown in Figure 2, the used PPF provides
higher flexural strengths to composites than the
new ones. We deduce that the main contribution
is from the higher interlaminar binding. This
deduction is confirmed by the results of ILSS shown
in Figure 3. The ILSS values of the UPPF, GF-UPPF
and CF-UPPF samples are 28.72, 37.27 and 43.81
MPa which are higher than the corresponding
values of the NPPF, GF-NPPF and CF-NPPF
samples (26.61, 34.54 and 40.54 MPa). Besides, the
combination of skin layers can enhance the ILSS
values, but the influence is not as effective as that
on the flexural strengths.
Figure 4 exhibits the in-plane compressive
strength of the honeycomb core PPF composites
representing the panel stiffnesses and failure
loads of the composites. Similar to the effect on
the ILSS values of the PPF composites, the used
filters provide stronger in-plane compression
strength to the honeycomb core PPF composites.
Noteworthily, the skin layers offer about 157.1%
to 290.5% elevation of the in-plane compressive
strength. During the test, the skin layers with high
rigidity were the main body to bear the in-plane
compressive force, while the weak honeycomb
core could only share a small portion of load12
.
Figure 3. ILSS of PPF composites with and
without the GF or CF skin layers.
74 | SAMPE JOURNAL | NOVEMBER/DECEMBER 2021
Figure 4. The in-plane compression properties of
the honeycomb core PPF composites with and
without the GF or CF skin layers.
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SAMPE Journal - November/December 2021

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