Rigid structural and low back face signature ballistic ud/articles and method of making
AssigneeHoneywell International Inc.
InventorsTHOMAS YIU-TAI TAM, JOHN ARMSTRONG YOUNG, RONNIE MOORE, DAVID A. HURST
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Abstract
Fabrication of ballistic resistant fibrous composites having improved ballistic resistance properties. More particularly, ballistic resistant fibrous composites having enhanced a dynamic storage modulus, which correlates to low composite backface signature.
Claims22
A process for the dynamic mechanical analysis of a polymeric binder coating on a fiber, the process comprising:
- a) providing a first fibrous composite comprising a consolidated plurality of cross-plied fiber plies, each fiber ply comprising a plurality of parallel fibers, each of said fibers having surfaces that are predominantly covered with a fiber surface finish and having a polymeric binder material coating on top of said fiber surface finish wherein said fiber surface finish is between the fiber surfaces and the polymeric binder material;
- b) applying an off-axis sinusoidal strain to said first fibrous composite to thereby determine the off-axis dynamic storage modulus of said polymeric binder coating on the fibers of the first fibrous composite, which off-axis sinusoidal strain is applied in a direction that is off-axis from the longitudinal fiber axis of the fibers in each fiber ply;
- c) repeating step b) for a second fibrous composite comparable to said first fibrous composite, which second fibrous composite comprises a consolidated plurality of cross-plied fiber plies, each fiber ply comprising a plurality of parallel fibers, each of said fibers having surfaces that are at least partially covered with a polymeric binder material, and wherein said fibers are predominantly free of a fiber surface finish such that said polymeric binder material is predominantly in direct contact with the fiber surfaces;
- d) comparing the off-axis dynamic storage modulus of the first fibrous composite with the off-axis dynamic storage modulus of the firstsecond fibrous composite to determine which composite has the higher off-axis dynamic storage modulus.
7-16. (canceled)
A method of forming a fibrous composite comprising at least two adjoined fiber layers, each fiber layer comprising fibers having surfaces that are at least partially covered with a polymeric material, wherein said fibers are predominantly free of a fiber surface finish such that said polymeric material is predominantly in direct contact with the fiber surfaces;
- said composite having a dynamic storage modulus of at least 8.0×109 dyn/cm2 as measured at 25° C. (77° F.), the method comprising providing a plurality of polymeric fibers having surfaces that are predominantly free of a fiber surface finish;
- optionally treating the fiber surfaces to enhance the surface adsorbability, bonding or adhesion of a subsequently applied polymeric material to the fiber surfaces;
- applying a polymeric material onto at least a portion of said fibers, thereby adsorbing, bonding or adhering the polymeric material on or to the fiber surfaces;
- producing a plurality of fiber plies from said fibers either before or after applying said polymeric material to said fibers;
- and consolidating said plurality of fiber plies to produce a fibrous composite.
(canceled)
A method of forming a fibrous composite comprising at least two adjoined fiber layers, each fiber layer comprising fibers having surfaces that are at least partially covered with a polymeric material, wherein said fibers are predominantly free of a fiber surface finish such that said polymeric material is predominantly in direct contact with the fiber surfaces;
- the method comprising providing a plurality of polymeric fibers having surfaces that are predominantly free of a fiber surface finish;
- optionally treating the fiber surfaces to enhance the surface adsorbability, bonding or adhesion of a subsequently applied polymeric material to the fiber surfaces;
- applying a polymeric material onto at least a portion of said fibers, thereby adsorbing, bonding or adhering the polymeric material on or to the fiber surfaces;
- producing a plurality of fiber plies from said fibers either before or after applying said polymeric material to said fibers;
- and consolidating said plurality of fiber plies to produce a fibrous composite, said fibrous composite having a dynamic storage modulus that is greater than the dynamic storage modulus of a comparable fibrous composite having fiber surfaces that are predominantly covered with a fiber surface finish wherein such a fiber surface finish is between the fiber surfaces and the polymeric material.
Dependencies are inferred from the claim text.