USA As Represented by Secretary of the Navy

Jeffry J Fedderly

Gilbert F Lee

Curtis A Martin

John Lee

Bruce T Hartmann

Edward Balizer

Karel Dusek

Jan Somvarsky

A composite armor including a ballistic armor layer and a directly attached polyurea layer. The polyurea layer is the cured reaction product of an isocyanate curing agent and a mixture of diamines having the general formula:HN-Ph-(C&#x2550;O)&#x2014;O&#x2014;(CH&#x2014;CH&#x2014;CH&#x2014;CH&#x2014;O)&#x2014;(C&#x2550;O)-Ph-NH,wherein in the mixture n in the ranges from 3 to 14 and the weight average value of n is about 9 to 10. Ph represents phenyl. In a preferred embodiment, the polyurea layer is the strike face. The composite armor is useful for light armor applications in which weight is a factor such as military vehicle armor and military boat armor.

Polyurea composite armor

The present invention's stratified composite material system of armor, as typically embodied, comprises a strike stratum and a backing stratum. The strike stratum includes elastomeric matrix material and inventive ceramic-inclusive elements embedded therein and arranged (e.g., in one or more rows and one or more columns) along a geometric plane corresponding to the front (initial strike) surface of the strike stratum. More rigid than the strike stratum, the backing stratum is constituted by, e.g., metallic (metal or metal alloy) material or fiber-reinforced polymeric matrix material. Some inventive embodiments also comprise a spall-containment stratum fronting the strike stratum. The inventive ceramic-inclusive elements geometrically describe any of various inventive modes, including: first mode, having a flat front face and a textured back face; second mode, having a pyramidal front section and a prismatoidal (especially, prismoidal, e.g., truncated pyramidal or prismatic) body section; hybrid mode, combining features of first and second modes.

Composite armor system including a ceramic-embedded heterogeneously layered polymeric matrix

Composite armor including geometric elements for attenuating shock waves

Composite ballistic armor having geometric ceramic elements for shock wave attenuation

A series of polymeric compositions, methods of making the compositions and uses of the compositions are described. An exemplary composition is made by copolymerization of a trifunctional amine or hydroxy compound, a monofunctional amine or hydroxy compound and a polyisocyanate compound.

Polymer having network structure

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Ellicott City, MD, United States of America

Jeffry J Fedderly