SAMPE Journal - January/February 2016 - 10
FEATURE ARTICLE
Figure 7a. Lower skin stringer radius.
Figure 7c. Upper skin joggle area.
Material Characterization Programmes
In order to validate the mechanical characteristics
of the 8552 fabric and tape materials as processed by
SQRTM and confirm the design allowable values used
for the sizing of the parts, a large characterization test
programme has been performed at two levels: from
samples directly taken out the demonstrators and from
separate flat panels.
Results from Specimens Sampled Out of the Demonstrator
Skin Parts
From test results (porosity, Tg measurements and
mechanical properties) obtained on samples extracted
from upper and lower skin demonstrator parts (Table
1) and consisting in specific part lay-ups, it can be
seen that all SQRTM specimen properties are above
minimum design requirements on one hand and that
all SQRTM mechanical test results are above equivalent
results obtained from a same part produced by mean
of the conventional autoclave process on the other
hand. This effect seems to be due to the better control
of the ply thicknesses, of the FVF ratio and of the ply
waviness (for compression properties mainly) brought
by this SQRTM process.
10
Figure 7b. Lower skin front spar radius.
Figure 7d. Upper skin rear spar radius.
Results from Specimens Sampled Out of Separate Flat Panels
An even more extensive mechanical property
comparison was done on the 8552/AS4 UD-tape
material on the basis of test specimens extracted from
flat panels either processed by SQRTM or by autoclave.
In this case, the lay-ups were unidirectional for tensile,
compression and ILSS material characteristics and
quasi-isotropic for open hole tension, open hole
compression, compression after impact and bearing
characteristics. For all investigated properties (Figure
8), the mechanical results of the SQRTM processed 8552
tape material are above the specification requirements
and equivalent or above those same properties for the
same material processed by autoclave.
Risk Reduction Phase and Full-Size Aircraft Flap
Components
The aim of this second project was to develop
full scale SQRTM skin components for the inboard
flap of a regional aircraft. To reach the high level
of quality required for actual aircraft parts within
a very short time period, Sonaca conducted, in a
first phase, a risk mitigation plan with a building
blocks approach (Figure 9).
SAMPE Journal, Volume 52, No. 1, January/February 2016
Table of Contents for the Digital Edition of SAMPE Journal - January/February 2016
Contents
SAMPE Journal - January/February 2016 - Cover1
SAMPE Journal - January/February 2016 - Cover2
SAMPE Journal - January/February 2016 - Contents
SAMPE Journal - January/February 2016 - 2
SAMPE Journal - January/February 2016 - 3
SAMPE Journal - January/February 2016 - 4
SAMPE Journal - January/February 2016 - 5
SAMPE Journal - January/February 2016 - 6
SAMPE Journal - January/February 2016 - 7
SAMPE Journal - January/February 2016 - 8
SAMPE Journal - January/February 2016 - 9
SAMPE Journal - January/February 2016 - 10
SAMPE Journal - January/February 2016 - 11
SAMPE Journal - January/February 2016 - 12
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SAMPE Journal - January/February 2016 - 14
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SAMPE Journal - January/February 2016 - 17
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SAMPE Journal - January/February 2016 - Cover3
SAMPE Journal - January/February 2016 - Cover4
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