SAMPE Journal - March/April 2017 - 41
Feature Article
continuous fiber reinforced parts.
Once again, the advantage of the
fiber orientation and the potential
of the 3D Fiber Spraying becomes
obvious. Furthermore, the stiffness
of the fiber sprayed parts is on a high
level.
Analysis of the Charpy Impact Properties
To compare the impact strength
of the three different laminates,
the
Charpy
impact
strength
was determined parallel and
perpendicular to the aspired fiber
orientation. In contrast to the results
presented above, the Charpy impact
properties are determined with
dynamic loads. Under dynamic
loads, the mechanical properties can
vary compared to quasi static loads,
which are used in bending and
tensile testing15.
The Charpy impact strength for
all preform types are illustrated in
Figure 8.
The results show, that the
continuous fiber reinforced parts
achieve significantly higher impact
strengths than the parts with
discontinuous
reinforcements.
The Charpy impact strength of the
part with non-crimped fabrics is
40% (parallel) respectively 104%
(perpendicular) higher than the
impact strength of the fiber sprayed
parts. The Charpy impact strength of
the fiber sprayed part is 48% higher
(parallel) respectively 34% lower
(perpendicular) compared to the
parts with chopped strands mats.
The results show that the
orientation of the fibers in the 3D
Fiber Spraying process leads to
a better performance of the parts
under dynamic impacts, compared
to parts with non-orientated fibers.
But in comparison to continuous
fiber reinforced parts, the Charpy
impact strength of the fiber sprayed
parts is significantly lower.
Analysis of the Flexural Properties after
Impact
The results show the influence of
one single impact load (16 J) on the
flexural properties. Therefore, the
SAMPE Journal, Volume 53, No. 2, March/April 2017
Figure 8. Influence of the preforming technology and fabrics on the Charpy impact
strength.
Figure 9. Influence of the preforming technology and fabrics on the flexural strength
after impact.
Figure 10. Influence of the preforming technology and fabrics on the flexural modulus
after impact.
results can only give an indication
for the damage tolerance of the
parts. In further investigations, more
specimens have to be damaged
with different loads to analyze the
material behavior in more detail.
Summarized the flexural strengths
after impact are presented in Figure
9.
The results show, that the
mechanical properties of the parts
are influenced by the impact.
The flexural strength of the fiber
sprayed part decreases from 610 N/
mm² (undamaged) to 558 N/mm²
(damaged) parallel to the aspired
fiber orientation. The flexural
strength of the part with non41
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