JEC COMPOSITES MAGAZINE - 2020 1st Quarter - Innovation report - 33

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NEW SHAPE-MEMORY RIVETS
FOR THE AERONAUTICS INDUSTRY

Multi-sector

DEVELOPMENT OF CARBON FIBRE-REINFORCED PRESSURE VESSELS

Aerospace

In the aeronautics sector, weight is a key
parameter and has to be continuously
reduced. To help reduce the total weight
of an aircraft, PolymerExpert suggests
replacing metal rivets with composite shape-memory rivets. The shape-memory property is
based on the deformation of the material at high temperature, followed by quenching and
freezing it in its glassy state. The material will return to its original shape on request, through
heating, thus reverting from the glassy state to the rubber state and releasing the stresses stored
during deformation. The use of composite shape-memory rivets provides several advantages:
- About 50% weight saving
- Easy to install, using a simple heated tool
- Reduced assembly time
- Reduced maintenance costs: the rivet can be removed without any stress on the structure
- Reduced management costs: generic dimensions can be provided to reduce the number of
rivet references
Characteristics of shape-memory rivets:
- Blind rivet - Rivet size adjustable from 0.5mm to more than 100mm
- Rivet material: polyacrylate resin
- Tensile (N): 300N to 700N
- Double shear (N): 1600N to 2400N
- Grip range: adaptable from 0.5mm to 1 metre
- Temperature range: -20 to 130°C.
www.polymerexpert.fr

BIG GAINS FOR SMALL SPACECRAFT USING HIGH-STRAIN COMPOSITES

Aerospace

www.polyone.com

Aerospace

INJECTION
OVERMOULDED
THERMOPLASTIC
COMPOSITES

PRONAT AEROSPACE: HYBRID UAV WING CORE

INNOVATION REPORT

Sports & Leisure

INNOVATION REPORT

After extensive research and development in the field of hydrogen pressure vessels, Cikoni presents a new development
methodology to increase the performance of filament-wound pressure vessels. The methodology takes a holistic approach by
linking costing, manufacturing and design in a stepwise procedure. Advanced multi-scale Aeronautic strategies are utilized to
detect weak points in the component and to minimize material utilization and, thereby, costs.
www.cikoni.com

Opterus Research and Development, Inc. is changing the way spacecraft design is traditionally approached,
particularly for smallsats and extremely large aperture instruments. After years of material development, a new
ground-breaking composite material and manufacturing process are being leveraged by Opterus to enable the next
generation of spacecraft. The company achieves this utilizing novel "high-strain composites" (HSC) to fabricate
deployable spacecraft structures. The high-strain composites utilized by Opterus offer a 2x increase in strength, 8x
increase in stiffness, 5x decrease in mass, and 20x increase in dimensional stability when compared to metals.High-strain composites have been
integrated deeply into the company's product portfolio and widely accepted by the greater aerospace community. The main products consist of
collapsible and rollable composite booms that are widely applied to a variety of spacecraft deployment mechanisms such as solar arrays, solar sails/
shades, precision-tensioned structures, various antenna architectures, on-orbit servicing systems, and debris capture systems. Additionally, HSCs
are ideally applied to solar array hinges that are easily integrated into deployable solar panel arrays, deployable radiators, and any system where
a traditional metal hinge would be used. Opterus' HSC hinges can be passively deployed and do not require actuators to initiate the deployment
sequence, reducing part counts, costs and mitigating mission risks.
www.opterusrd.com

Pronat produced a hybrid wing flap core for typical use on a UAV. The challenge was to build an airframe
section showcasing the different materials that can be used in this application.
The wing was divided into six sections, each section incorporating different grades of Nomex honeycomb
and high-density foam. The construction illustrates the different surface quality levels that are possible when
machining these lightweight, yet extremely strong, sections. This innovative wing flap enables composite design engineers to have a feel for the
various materials that can be used in their design constructions. The figure shows the actual materials that were used for the exhibition display:
Rohacell high-density foam (HERO200, 71WF, 51HF, HERO150) and Nomex honeycomb (Euro Composite ECA-R-4.8-48 and Schutz C1-3.2-64).
The hybrid wing core section can be seen on the Pronat Aerospace stand. www.pronataerospace.com

January-February-March 2020 /

jec composites magazine

http://www.polyone.com http://www.polymerexpert.fr http://www.cikoni.com http://www.opterusrd.com http://www.pronataerospace.com

JEC COMPOSITES MAGAZINE - 2020 1st Quarter - Innovation report

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