General
- A Sandwich structured
composite is a special class of composite materials that is fabricated
by attaching two thin but
stiff skins to a lightweight but thick core.
- Open and closed cell
structured foam, balsa wood and syntactic foam, and composite honeycomb
are commonly used core materials.
- Glass or carbon fiber
reinforced laminates are widely used as skin materials. Sheet metal is
also used as skin materials in some cases
Process
- Sandwich panel
constructions using metallic and polymeric honeycombs are used in the
automotive industry.
- Due to rising
production costs,research on the so-called liquid resin infusion method
(LRI) has intensified lately since this method promises a significant
reduction in manufacturing cost.
- In foam core sandwich
technique, graphite foam can replace honeycomb in applications that
require high
thermal conductivity and low weight.
Applications
- The aerospace
industry use composite structural materials because of their exceptional
strength and stiffness-to-density ratios and superior physical
properties.
- Hylite : used in
automotive application for avoiding 'metallic' sound, and obviates the
need for damping materials which
add to both weight and cost.
- Composite sandwich
construction is playing an increasingly important role in the design of
structures because of its exceptionally high flexural
stiffness-to-weight ratio.
Technology
- Fabrication
Technology : Hexcel composites Honeycombare easy tofabricate into
finished panels and even complex components.
- Laser Technology :
Laser welding (autogenous and cold filler wire),Laser welding with hot
wire and Hybrid,Laser Brazing,Laser Remote Scanning (Small and large
field).
- Threshold vacuum
insulation technology: This technology provides increased energy
savings, increased cargo space and high durability.
Report
- Preliminary tests
were completed on sandwich panels for one University. These tests were
conducted to determine appropriate specimen geometries and fixture
requirements for future potential user proposals.
- A report presents the
results of tests conducted to determine the stresses induced in the core
and facings of a flat sandwich panel by a concentrated load applied at
an insert.
- In the use of
structural sandwich construction, particularly for aircraft structures,
it is often necessary to carry loads into the sandwich through fittings
that allow loads to be applied in a direction normal or inclined to the
plane of the sandwich.
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