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Lightweight Armor Materials:
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Ceramic & Composite Armor
Protection
Principles
Page 4 of 5 in this article (next)
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Conventional steel armor defeats an incoming projectile by reducing its kinetic energy
through ductile deformation. In a composite, ceramic based armor, a different
process is employed. Firstly, the hit-on the strike (top) surface causes
significant deformation to the projectile, increasing its cross section. Its
kinetic energy is reduced as the bullet is fragmentized on shattering the
tile's hard surface. The residual energy of the smaller fragments is absorbed
by plastic or elastic deformation within the backing of the armor tile. A
typical composite protection tile weighs half the weight of steel plate that
would provide the same level of protection. In spite of its weight advantage significant
drawbacks of the composite armor remains in its limited capability to protect against
multiple hits (as the ceramic element does not retain the same physical
properties after disintegration). To improve the armor performance in multi-hit
scenarios, smaller ceramic elements are used. In a mosaic or matrix modules,
special cylindrical or ball shaped ceramic pellets are used, reducing the
affected area to few centimeters, small enough to protect against repeated
impact on adjacent surface.
The mosaic of
small tiles or pellets is embedded in a matrix of epoxy; additional layers of composite
materials or rubber (RAMTECH) are used, to seal the armor tile from both sides. As the
tile is attached to the ballistic steel or aluminum armor of the vehicle's
hull, the overall protection of the vehicle is increased dramatically. Future
applications of advanced composite structures configurations are currently in
research phase and include ceramic-ceramic, ceramic – metal
and ceramic – carbon elements.
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