SAMPE Journal - July/August 2022 - 73

the potential lowered crack-propagation proneness
due to the uniformly distributed but splices (crackstop-capability).
This effect should be investigated
and quantified in further research activities.
OVERVIEW SUMMARY AND CONCLUSION
Fiber Patch Placement as an innovative multimaterial
manufacturing technology enables
automated production of complex-shaped
aerospace structures. FPP uses fiber reinforced
patches of finite length, which deviates from
reinforcement strategies of conventional
aerospace laminates. On the one hand, a setback in
UD material properties is expected because of the
discontinuous reinforcement. On the other hand,
the effect on the more relevant design allowables,
Delamination area
[mm2
]
Mean value
Conv.
1775.9
Standard dev. 659.5
FPP 1
1558.1
208.9
Figure 12. Representative close-up of the
impacted area.
Dent depth
[mm]
Conv.
0.59
0.09
FPP 1
0.39
0.11
Table 7. C-scan of the specimens after a 30 J impact.
Test name
Tensile
In-plane shear
Interlaminar shear
Notched tension
Bearing strength
CAI
E11
σ11
G
T
t
Properties A-basis B-basis Standard deviation
-10
-57
+6
-18
-9
+27
-61
+5
-2
-9
σtn
Notched compression σcn
py
pu
n
-5
+1
+1
σr(30J)
+4
-8
+9
-13
-5
-7
+9
-59
+6
-10
-9
-7
+5
-10
-5
-2
Table 8. Relative difference between FPP 1 to conventional results in [%].
based on notched test specimen, was previously
unknown. Since real aerospace structures often
contain discontinuities like ply drop-offs, holes or
impact damage, the discontinuously reinforced
FPP laminates can be expected to present a
similar behavior. To investigate and quantify those
effects, we conducted an extensive study based
on aerospace test norms, comparing a suitable
FPP laminate with a conventional laminate
manufactured by hand laid-up prepreg. The results
given in this paper also include the calculation
of A- and B-basis strength values, as they are
www. sampe.org
essential for the dimensioning of aircraft structural
components.
Table 8 shows a comprehensive overview of the
test results based on a relative comparison between
FPP 1 and conventional samples.
While the tension test results for the
unidirectional FPP laminate show a 57% reduction
in average strength (61% A-value, 59% B-value), the
stiffness is effectively on par with the continuously
reinforced reference laminate (10% reduction
average value, 27% increase A-value, 9% increase
B-value). This enables a basically equivalent
JULY AUGUST 2022
|
SAMPE JOURNAL |
73
-85.1
-22.8
+23.6
-72.0
-9.9
+8.6
-32.8
+14.2
-9.8
+81.0
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SAMPE Journal - July/August 2022

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