Load sharing hard point net
A shield system for an ordnance includes a frame and a flexible net subsystem supported by the frame. Diagonal lines of net material intersect at nodes forming diamond shaped mesh openings and a hard point is attached to at least select nodes.
1. A vehicle or structure shield comprising:
a flexible net including diagonally extending intersecting lines having a predetermined breaking strength to break upon impact of an ordnance, said intersecting lines connected at nodes;
hard points pivotably disposed at least at select nodes; and
a frame supporting the net and positioning the net and hard points in a spaced relationship between the vehicle and/or structure.
2. The shield of claim 1 in which the net lines have a breaking strength such that a line will break upon impact of an ordnance with the line for a predetermined percentage of ordnance impacts.
3. The shield of claim 2 in which the predetermined percent is 100 percent.
4. The shield of claim 2 in which the predetermined percentage is between 80 and 100%.
5. The shield of claim 2 in which the net material has a breaking strength of between 100 lbs and 1,500 lbs.
6. The shield of claim 1 in which the hard points each include a post portion and a base portion with a cavity receiving the post portion therein.
7. The shield of claim 1 in which each hard point includes:
a front face;
sidewalls extending rearward from the front face including slots therethrough for lines of the net;
a cavity surrounded by the sidewalls; and
a plug sized to be frictionally received in the cavity locking the lines of the net in the cavity.
8. The shield of claim 7 in which the plug includes an outer wall with a knurled surface.
9. The shield of claim 7 in which the front face has six or more sides there are six or more sidewalls.
10. The shield of claim 7 in which two opposing sidewalls have slots therethrough in the middle of the opposing sidewalls.
11. The shield of claim 10 in which there is a slot between adjacent sidewalls on each side of said two opposing sidewalls.
12. The shield of claim 7 in which the front face has an area of between 0.1 and 0.8 in. 2 .
13. The shield of claim 7 in which the sidewalls each have an area of between 0.1 and 0.8 in. 2 .
14. The shield of claim 7 in which the cavity is round and the plug is cylindrical in shape.
15. The previously presented of claim 7 in which each hard point weighs between 10 and 40 grams.
16. The shield of claim 7 in which the slots each terminate in a rounded portion.
17. The shield of claim 1 in which the hard points include steel.
18. The shield of claim 1 in which the hard points weigh between 10 and 80 grams.
19. The shield of claim 1 in which the line has a diameter of between 1.7 and 1.9 mm.
20. The shield of claim 1 in which the mesh openings are between 110 mm and 190 mm.
21. The shield of claim 1 in which the diagonally extending intersecting lines share hard point loads thereby decreasing likelihood of breakage of the lines when said flexible net is jerked, bounced, or oscillated absent impact of an ordnance.
22. A method of fabricating a shield system, the method comprising:
selecting net line material having a predetermined breaking strength to break upon impact of an ordnance;
attaching hard points to the net;
attaching the net to a frame; and
attaching the frame to a vehicle or structure such that the net lines run diagonally.
23. The method of claim 22 in which selecting includes choosing a net line material with a breaking strength of between 100 lbs and 1,500 lbs.