JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 35
process
Development of multi-thickness
AS4/PEEK stringers using efficient process
Structural components manufactured from carbon-fibre-reinforced
thermoplastics offer excellent mechanical properties – including
fracture toughness and compression after impact – and physical
properties that make them ideal for aircraft/aerospace applications.
By
D. DeWayne Howell, Senior Composite
Structural Engineer
Andrew M. Lizotte, Engineering Manager
Dustin L. Dequine, Senior Composite
Structural Engineer
Fiberforge Corporation
the airframe (Figure 1).
A
The stringers act as beams that accumulate
the cargo compression loads and concentrate them into the aircraft frames. It is at
these frame interfaces that high compression
and moment loads are developed in the
stringers, particularly in the radius of the
C-channels (see free body diagram in Figure
1). To alleviate the high stress concentrations in the channels at the aircraft frame
interfaces, the laminate is thickened locally
These padups can extend all the way up the
web and onto the top flange or can be terminated part way up the web with essentially
the same strength results. While a C-channel
is the focus and discussion of this study,
other stringer cross sections can be stampformed without the need for secondary processes to assemble the stringers. Examples of
these cross sections
Stringer-stiffened floor panel design
considerations
For this study, an aircraft load floor was
designed and analyzed to carry significant
cargo compression loads. The floor consists
of top and bottom facesheets that sandwich
C-channel shaped stringers. As cargo loads
are applied to the top facesheet, these loads
are transferred through the stringers and into
Fig. 1: Load Floor with Cargo Load and Free Body Diagram
No80 April 2013 /
Feature Aeronautics
S4/PEEK stringers were designed to carry typical aircraft loads.
Loads concentrated at airframe
interfaces are managed using local padup
reinforcements within the stringers. The
padups consist of several additional plies of
unidirectional material that are strategically
placed. Fabrication of the stringers includes
automatic layup of multi-angle laminates
using unidirectional tape; consolidation of
the layup to create a solid flat laminate; and
stamp-forming the laminate into the final
3D profile. This study describes the stringer
design with padups, processing methods
used, and test results.
by application of additional plies of material
(Figure 2).
jec composites magazine 35
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013
Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #80 - April 2013
Cover
Edito
Point of view: hig-end solutuions
Contents
Agenda of Events
COMPANY & BUSINESS In Brief
APPLICATIONS
- Sports & leisure
- Renovation
MARKET
- Singapore
- Education
- Natural fibres
- Biocomposites
FEATURE AERONAUTICS
- Carbon
- Process
- Reinforcement
- Structure
- Bi-angle NCF
- RTM
- Sandwich
- Energy
RESEARCH & DEVELOPMENT
- CAE tools
- CFRP
TECHNOLOGY & INNOVATIONS
- Prepreg
- Material
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Cover
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 2
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Edito
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Point of view: hig-end solutuions
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 5
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Contents
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 7
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 9
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sports & leisure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 12
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 13
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Renovation
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Singapore
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 16
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 17
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 18
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Education
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 20
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 21
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 22
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 23
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 24
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 25
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Natural fibres
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 27
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 29
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 30
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 31
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 32
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Carbon
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 34
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Process
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 36
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 37
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Reinforcement
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 39
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 40
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Structure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 42
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Bi-angle NCF
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 44
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - RTM
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 46
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sandwich
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 48
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 49
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Energy
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 51
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CAE tools
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 53
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 54
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CFRP
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 56
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 57
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 58
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 60
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 61
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Material
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 63
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 64
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Index
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 67
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 68
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