Fibrous armour material

Patent metadata

Field	Value
Publication number	US-9816788-B2
Application number	US-201214358783-A
Country	US
Kind code	B2
Filing date	Nov 14, 2012
Priority date	Nov 17, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

According to the invention there is provided a fibrous armor material for dissipating the kinetic energy of a moving object which is impregnated with a shear thickening fluid, in which the shear thickening fluid includes particles of a thickening agent suspended in a liquid, and the volume fraction of the thickening agent in the shear thickening fluid is selected so that the shear thickening fluid has a viscosity-shear stress characteristic substantially corresponding to curve B or lying between curve B and curve D as shown in FIG. 2 .

First claim

The invention claimed is:

1. A fibrous armour material for dissipating the kinetic energy of a moving object, said fibrous armour material being impregnated with a shear thickening fluid, in which the shear thickening fluid includes particles of a thickening agent suspended in a liquid, and the volume fraction of the thickening agent in the shear thickening fluid is selected to be in the range 47 to 50% so that the shear thickening fluid has at least one of:
a viscosity of 0.11 to 0.21 PaS at a shear stress of 200 Pa,
a viscosity of 0.13 to 0.27 PaS at a shear stress of 400 Pa,
a viscosity of 0.14 to 0.37 PaS at a shear stress of 600 Pa, and
a viscosity of 0.16 to 0.45 PaS at a shear stress of 800 Pa.

2. A fibrous armour material according to claim 1 , in which the volume fraction of the thickening agent in the shear thickening fluid is selected so that the shear thickening fluid has at least one of:
a viscosity of 0.13 to 0.21 PaS at a shear stress of 200 Pa,
a viscosity of 0.15 to 0.27 PaS at a shear stress of 400 Pa,
a viscosity of 0.19 to 0.37 PaS at a shear stress of 600 Pa, and
a viscosity of 0.22 to 0.45 PaS at a shear stress of 800 Pa.

3. A fibrous armour material according to claim 2 , in which the volume fraction of the thickening agent in the shear thickening fluid is selected so that the shear thickening fluid has at least one of:
a viscosity of about 0.13 PaS at a shear stress of 200 Pa,
a viscosity of about 0.15 PaS at a shear stress of 400 Pa,
a viscosity of about 0.19 PaS at a shear stress of 600 Pa, and
a viscosity of about 0.22 PaS at a shear stress of 800 Pa.

4. A fibrous armour material according to claim 1 in which the volume fraction of the thickening agent in the shear thickening fluid is in the range 48 to 50%.

5. A fibrous armour material according to claim 4 in which the volume fraction of the thickening agent in the shear thickening fluid is in the range 49 to 50%.

6. A fibrous armour material according to claim 1 in which the particles are inorganic particles.

7. A fibrous armour material according to claim 1 in which the particles are silica.

8. A fibrous material according to claim 1 in which the liquid is an organic liquid, a silicone based liquid or aqueous.

9. A fibrous armour material according to claim 1 in which the liquid is ethylene glycol.

10. A fibrous armour material according to claim 1 which contains aramid fibres.

11. A fibrous armour material according to claim 1 , incorporated into a protective material for dissipating the kinetic energy of a moving object including a plurality of layers of fibrous armour material, in which at least one of said layers is impregnated with the shear thickening fluid.

12. A fibrous armour material according to claim 1 , incorporated into an article of body armour.

13. A fibrous armour material according to claim 1 , incorporated into a vehicle.

14. A fibrous armour material according to claim 13 , incorporated into an aircraft.

15. A fibrous armour material according to claim 14 , wherein the fibrous armour material is present in the aircraft as an engine lining.

16. A fibrous armour material according to claim 1 , incorporated into a flexible structure for mitigating the effects of blast.

17. A fibrous armour material according to claim 16 , wherein the flexible structure includes a tent or blanket.

18. A fibrous armour material according to claim 1 in which the volume fraction of the thickening agent in the shear thickening fluid is 49%.

19. A fibrous armour material according to claim 1 which includes poly paraphenylene terephthalamide fibres.

Assignees

• Bae Systems Plc
• BAE SYSTEMS pllc

Inventors

• Haq Sajad
• Morley Caroline Joleen

Classifications

• Y10T442/2623

  Ballistic resistant · CPC title

• F41H7/00

  Armoured or armed vehicles (general vehicle aspects B60; armoured or armed ships B63G; armoured or armed aircraft B64D; mounting guns, e.g. machine guns, on vehicles F41A23/00) · CPC title

• F41H7/02

  Land vehicles with enclosing armour, e.g. tanks (endless-track vehicles, steering thereof B62D {; vehicles for placing portable or sectional bridges E01D15/127; vehicles carrying floating bridges E01D15/22}) · CPC title

• F41H5/0485 Primary

  all the layers being only fibre- or fabric-reinforced layers · CPC title

• B64D7/00

  Arrangement of military equipment, e.g. armaments, armament accessories or military shielding, in aircraft; Adaptations of armament mountings for aircraft (dropping bombs or the like B64D1/00) · CPC title