High density, high dry-resin content fabric for rigid composite ballistic armor
A ballistic composite armor article includes a multi-layer hard armor sheet that has at least first and second unidirectional yarn monolayers. The second unidirectional yarn monolayer is transversely oriented with respect to the first unidirectional yarn monolayer, and there is at least one polymeric binder layer arranged adjacent to and stabilizing at least one of the first and second unidirectional yarn monolayers. The yarns of the first and second unidirectional yarn monolayers include respective fiber bundles that have a lateral spread factor ranging from negative lateral spread to a positive lateral spread of less than 306%.
1. A ballistic composite armor article comprising:
a multi-layer hard armor sheet including at least first and second unidirectional yarn monolayers, the second unidirectional yarn monolayer transversely oriented with respect to the first unidirectional yarn monolayer, and at least one polymeric binder layer arranged adjacent to and stabilizing at least one of the first and second unidirectional yarn monolayers, the yarns of the first and second unidirectional yarn monolayers including respective fiber bundles that have a lateral spread factor ranging from negative lateral spread to a positive lateral spread of less than 306%.
2. The ballistic composite armor article as recited in claim 1 , wherein the multi-layer hard armor sheet has, by weight, 20%-50% of the polymeric binder.
3. The ballistic composite armor article as recited in claim 1 , wherein the individual fibers of the fiber bundles have a diameter (D), and the first and second unidirectional yarn monolayers have respective thicknesses that are each greater than 11D.
4. The ballistic composite armor article as recited in claim 3 , wherein the fibers are organic fibers and the respective thicknesses are 11D to 23D.
5. The ballistic composite armor article as recited in claim 3 , wherein the fibers are inorganic fibers and the respective thicknesses are 20D to 40D.
6. The ballistic composite armor article as recited in claim 1 , wherein the fibers are inorganic fibers and the lateral spread factor ranges from −30% to 35%.
7. The ballistic composite armor article as recited in claim 1 , wherein the yarns of the first and second unidirectional yarn monolayers have an axial twist of 0.5 to less than 20 turns per meter.
8. The ballistic composite armor article as recited in claim 1 , wherein the yarns of the first and second unidirectional yarn monolayers have an axial twist of 0.5-4 turns per meter.
9. The ballistic composite armor article as recited in claim 1 , wherein less than 20% of the fibers of the fiber bundles are in contact with the at least one polymeric binder layer.
10. The ballistic composite armor article as recited in claim 1 , wherein less than 11% of the fibers of the fiber bundles are in contact with the at least one polymeric binder layer.
11. The ballistic composite armor article as recited in claim 1 , wherein the at least one polymeric binder layer includes at least one first distinct polymeric binder layer between the first and second unidirectional yarn monolayers, and second and third distinct polymeric binder layers arranged at the respective opposite faces of the first and second unidirectional yarn monolayers from the at least one first distinct polymeric binder layer.
12. The ballistic composite armor article as recited in claim 11 , wherein the at least one first distinct polymeric binder layer has a higher areal density than each of the second and third distinct polymeric binder layers.
13. The ballistic composite armor article as recited in claim 1 , wherein the fibers are organic fibers.
14. The ballistic composite armor article as recited in claim 1 , wherein the fibers are inorganic fibers.