SAMPE Journal - January/February 2016 - 8
FEATURE ARTICLE
Figure 2. SQRTM process principle.
SQRTM process involves prepreg material cured in a
closed mold. The pressure inside the mold is applied
by a small quantity of prepreg resin (to be available
in bulk form) that is injected to fill the tool cavity
around the edges of the part and maintained until
the gel of the prepreg material. The process combines
advantages from prepreg materials (use of high tough
resins and ease combination with automatic deposition
and preforming techniques of UD-tapes) and RTM
process (dimensional and surface qualities). Following
advantages were also considered during the initial
trade-off analysis for the technology selection of such
wing control surface structure having very stringent
requirements in terms of structural performance,
weight optimisation, aerodynamic quality and cost:
* Strong control on thicknesses,
* Strong control on the geometry (radii, plies
conformity),
* High surface quality,
* Robust process generating less scraps, less
non conformities and repairs,
* High level of part integration possible,
* Faster NDT inspection (less scatter at the part
surface due to the better surface roughness),
* Automation possible with the use of UD
reinforcements (AFP or ATL) and it can be
pushed further than autoclave (no vacuum bag,
more repeatable process).
The main injection/curing steps are (Figure 2):
-Putting the resin inside the injector, degassing and
heating it to the specified resin injection temperature,
-Applying vacuum to the mold having the prepreg layup placed inside,
-Heating-up the tool to the specified injection
temperature,
-Opening the injection line and adjusting injection
pressure or resin flow,
-Shutting-off vacuum port valves on tool when resin
appears,
-Ramping tool temperature to the curing temperature,
-Shutting-off the resin injection,
-Holding the curing temperature/time.
SQRTM Composite Flap R&D Project
SQRTM Flap Demonstrator Part and Tool Concepts
The demonstrator (Figure 3) has been designed
to be composed of only four main elements: a lower
skin with an integrated front spar, an upper skin with
an integrated rear spar, a D-nose and a trailing edge.
Selected raw material was 8552 resin with AGP193
fabric and AS4 UD-tape carbon reinforcements as well
as expanded copper foil 3 CU 7-125 on the outer surface
of the skins, D-nose and trailing edge. Fabric material
Figure 3.
SQRTM flap demonstrator.
8
Figure 4. SQRTM mold cross-section.
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
SAMPE Journal - January/February 2016 - 13
SAMPE Journal - January/February 2016 - 14
SAMPE Journal - January/February 2016 - 15
SAMPE Journal - January/February 2016 - 16
SAMPE Journal - January/February 2016 - 17
SAMPE Journal - January/February 2016 - 18
SAMPE Journal - January/February 2016 - 19
SAMPE Journal - January/February 2016 - 20
SAMPE Journal - January/February 2016 - 21
SAMPE Journal - January/February 2016 - 22
SAMPE Journal - January/February 2016 - 23
SAMPE Journal - January/February 2016 - 24
SAMPE Journal - January/February 2016 - 25
SAMPE Journal - January/February 2016 - 26
SAMPE Journal - January/February 2016 - 27
SAMPE Journal - January/February 2016 - 28
SAMPE Journal - January/February 2016 - 29
SAMPE Journal - January/February 2016 - 30
SAMPE Journal - January/February 2016 - 31
SAMPE Journal - January/February 2016 - 32
SAMPE Journal - January/February 2016 - 33
SAMPE Journal - January/February 2016 - 34
SAMPE Journal - January/February 2016 - 35
SAMPE Journal - January/February 2016 - 36
SAMPE Journal - January/February 2016 - 37
SAMPE Journal - January/February 2016 - 38
SAMPE Journal - January/February 2016 - 39
SAMPE Journal - January/February 2016 - 40
SAMPE Journal - January/February 2016 - 41
SAMPE Journal - January/February 2016 - 42
SAMPE Journal - January/February 2016 - 43
SAMPE Journal - January/February 2016 - 44
SAMPE Journal - January/February 2016 - 45
SAMPE Journal - January/February 2016 - 46
SAMPE Journal - January/February 2016 - 47
SAMPE Journal - January/February 2016 - 48
SAMPE Journal - January/February 2016 - 49
SAMPE Journal - January/February 2016 - 50
SAMPE Journal - January/February 2016 - 51
SAMPE Journal - January/February 2016 - 52
SAMPE Journal - January/February 2016 - 53
SAMPE Journal - January/February 2016 - 54
SAMPE Journal - January/February 2016 - 55
SAMPE Journal - January/February 2016 - 56
SAMPE Journal - January/February 2016 - 57
SAMPE Journal - January/February 2016 - 58
SAMPE Journal - January/February 2016 - 59
SAMPE Journal - January/February 2016 - 60
SAMPE Journal - January/February 2016 - 61
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SAMPE Journal - January/February 2016 - 64
SAMPE Journal - January/February 2016 - 65
SAMPE Journal - January/February 2016 - 66
SAMPE Journal - January/February 2016 - 67
SAMPE Journal - January/February 2016 - 68
SAMPE Journal - January/February 2016 - Cover3
SAMPE Journal - January/February 2016 - Cover4
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