Re-entrant cellular multifunctional structure for energy absorption and method of manufacturing and using the same

• US 20060286342A1
• Filed: 05/27/2004
• Published: 12/21/2006
• Est. Priority Date: 05/28/2003
• Status: Abandoned Application

• Current Assignee: University of Virginia Patent Foundation (University of Virginia)
• Original Assignee: University of Virginia Patent Foundation (University of Virginia)
• Inventors: Elzey, Dana M.
• Application Number:
  US10/557,560
• Publication Number:
  US 20060286342A1
• Time in Patent Office: Days
• US Class Current: 428/131
• CPC Class Codes: B22F 3/1115 comprising complex forms, e.g. honeycombs
• CPC Class Codes: B32B 2307/558 Impact strength, toughness
• CPC Class Codes: B32B 2419/00 Buildings or parts thereof walls, panels B32B2607/00
• CPC Class Codes: B32B 2605/00 Vehicles
• CPC Class Codes: B32B 3/10 characterised by a discontinuous layer, i.e. formed of separate pieces of material
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 5/18 characterised by features of a layer of foamed material
• CPC Class Codes: B32B 7/022 Mechanical properties
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B60R 19/18 characterised by the cross-section; Means within the bumper to absorb impact
• CPC Class Codes: B60R 19/22 containing mainly cellular material, e.g. solid foam
• CPC Class Codes: B60R 21/04 Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
• CPC Class Codes: B65D 81/05 maintaining contents at spaced relation from package walls, or from other contents B65D81/022, B65D81/025, B65D81/03 take precedence
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/249981 Plural void-containing components

Abstract

A cellular composite laminate structure (101) adapted for efficient energy absorption is provided along with the related use and method of manufacture. The structure uses rigid cellular core layers (102, 103) designed to remain rigid during impact loading to channel an imposed compressive force into plastic deformation of deforming sacrificial layers (116). The rigid cellular core layers (102, 103) are arranged such that they will interpenetrate during impact loading while the deforming sacrificial layers (116) are arranged such that they will impede interpenetration of the rigid cellular core layers (102, 103) and be subjected to tensile deformation only. The rigid cellular core layers (102, 103) and deforming sacrificial layers (116) can be formed to create two-dimensional cellular sheet or three-dimensional cellular topology structures. The deforming sacrificial layers (116) can be connected at various points to the rigid cellular core layers (102, 103) or can be connected only at the periphery of the overall structure. Higher strength, rigid materials are contemplated for the rigid cellular core layers (102, 103) while ductile materials are contemplated for the deforming sacrificial layers (116).

Claims

1. A structure for efficient impact energy absorption, the structure comprising:

a first cellular layer;

a second cellular layer, said first and said second cellular core layers adapted to;

remain at least substantially rigid during impact loading, and

interpenetrate during impact loading;

at least one sacrificial layer disposed between said first cellular layer and said second cellular layer, said sacrificial layer adapted to;

deform during impact loading, and

impede the interpenetration of said first cellular layer and said second cellular layer during impact loading.

2. The structure of claim 1, wherein said sacrificial layer deforms plastically.

3. The structure of claim 1, wherein said sacrificial layer is subjected to tensile loading during the impact loading.

4. The structure of claim 1, wherein said sacrificial layer comprises a periodic cellular structure.

5. The structure of claim 1, wherein said sacrificial layer comprises a perforated sheet.

6. The structure of claim 5, wherein said perforated sheet comprises of perforations having at least one of the shapes including circular, square, rectangular, parallelogram, hexagonal, triangular, ellipsoidal, pentagonal, octagonal, or combinations thereof.

7. The structure of claim 1, wherein said sacrificial layer comprises an aperture sheet.

8. The structure of claim 7, wherein said aperture sheet comprises of apertures having at least one of the shapes including circular, square, rectangular, parallelogram, hexagonal, triangular, ellipsoidal, pentagonal, octagonal, or combinations thereof.

9. The structure of claim 1, wherein said sacrificial layer is comprised of truss units.

10. The structure of claim 9, wherein said truss units are comprised of at least one shape or combination of the shapes including tetrahedral, pyramidal, or Kagome.

11. The structure of claim 1, wherein said sacrificial layer comprises a woven or braided structure.

12. The structure of claim 1, wherein said sacrificial layer comprises a cellular sheet structure.

13. The structure of claim 12, wherein said cellular sheet structure is at least substantially flat.

14. The structure of claim 1, wherein said sacrificial layer comprises at least one shape or combination of the shapes including corrugated or egg crate.

15. The structure of claim 1, wherein said sacrificial layer that is at least one of curved, planar, substantially planar, or has a plurality of curves.

16. The structure of claim 1, wherein said sacrificial layer is comprised of a material of at least one of metals, metal alloys, inorganic polymers, organic polymers, ceramics, glasses, semiconductors, electronic materials and photonic materials, and all composite derivatives.

17. The method of claim 1, wherein said sacrificial layer is comprised of a composite formed of a material of at least one of metals, metal alloys, inorganic polymers, organic polymers, ceramics, glasses, semiconductors, electronic materials and photonic materials.

18. The method of claim 1, wherein the topology of said sacrificial layer includes at least one of stamped sheet goods, woven textiles, expanded sheet goods, expanded metal, laser cut sheets, perforated sheets, wires, strips, bands, and hollow tube arrays or any combination thereof.

19. The structure of claim 1, wherein said sacrificial layer comprise a plurality of segments.

20. The structure of claim 19, wherein at least some of said plurality of segments have a cross section including at least one of square, rectangular triangular, circular, tubular, or combination thereof.

21. The structure of claim 1, wherein said first cellular layer and said second cellular layer each comprises a periodic cellular structure.

22. The structure of claim 21, wherein said periodic cellular structure comprises truss units.

23. The structure of claim 1, wherein said first cellular layer and said second cellular layer are comprised of truss units.

24. The structure of claim 23, wherein said truss units are comprised of truss legs.

25. The structure of claim 24, wherein said at least a plurality of said truss legs have a channel or angled shaped cross section.

26. The structure of claim 24, wherein at least plurality of said plurality truss legs have a cross section including at least one of square, rectangular triangular, circular, tubular, or combination thereof.

27. The structure of claim 23, wherein said truss units are comprised of at least one shape or combination of the shapes including tetrahedral, pyramidal, or Kagome.

28. The structure of claim 1, wherein said first cellular layer and said second cellular layer each comprises at least one shape or combination of the shapes including a corrugated shape structure or an egg crate structure.

29. The structure of claim 1, wherein at least one of said first cellular layer and said second cellular layer is comprised of a material of at least one of metals, metal alloys, inorganic polymers, organic polymers, ceramics, glasses, semiconductors, electronic materials and photonic materials, and all composite derivatives.

30. The method of claim 1, wherein at least one of said first cellular layer and said second cellular layer is comprised of a composite formed of a material of at least one of metals, metal alloys, inorganic polymers, organic polymers, ceramics, glasses, semiconductors, electronic materials and photonic materials.

31. The structure of claim 1, wherein said sacrificial layer is in communication with said first cellular layer and/or in communication with said second cellular layer at at least one point or region of contact.

32. The structure of claim 31, wherein said communication comprises at least one mechanical fastening device.

33. The structure of claim 32, wherein said mechanical fastening device comprises at least one of threaded fasteners, pins, clips, or rivets.

34. The structure of claim 31, wherein said communication comprises at least one metallurgical joint.

35. The structure of claim 34, wherein said joint comprises at least one of welding joint, brazing joint, liquid phase sintering joint, spot welding joint, or laser welding joint.

36. The structure of claim 31, wherein said communication comprises at least one adhesive bond.

37. The structure of claim 1, wherein said structure comprises at least one of:

an architectural structure,

a civil engineering field structure,

a machine field structure,

an automobile structure,

a ship structure,

a freight car structure,

an aircraft structure,

a space station structure, or

a submarine, ship, or water craft structure.

38. The structure of claim 37, wherein:

said architectural structure comprises at least one of

pillars, walls, shielding, foundations or floors for buildings or pillars, or wall shielding floors,

said civil engineering field structure comprises at least one of

road facilities such as noise resistant walls and crash barriers, road paving materials, permanent and portable aircraft landing runways, pipes, segment materials for tunnels, segment materials for underwater tunnels, tube structural materials, main beams of bridges, bridge floors, girders, cross beams of bridges, girder walls, piers, bridge substructures, towers, dikes and dams, guide ways, railroads, ocean structures such as breakwaters and wharf protection for harbor facilities, floating piers/oil excavation or production platforms, or airport structures such as runways,

said machine field structure comprises at least one of

frame structures for carrying system, carrying pallets, or frame structure for robots, etc.,

said automobile structure comprising at least one of

a body, frame, doors, chassis, roof and floor, side beams, or bumpers, etc.,

said ship structure comprising at least one of;

a main frame of the ship, body, deck, partition wall, or wall, etc.,

said freight car structure comprising at least one of

body, frame, floor, or wall, etc.,

said aircraft structure comprising at least one of

a wing, main frame, body, or floor, etc.,

said spacecraft comprising at least one of

a body, frame, floor, or wall, etc.,

said space station comprising at least one of

a main body, floor, or wall, etc., and

said submarine, ship, or water craft comprising at least one of

a body, or frame, etc.

39. A method of making a structure for efficient impact energy absorption, the method comprising:

providing a first cellular layer;

providing a second cellular layer, said first rigid cellular core layer and said second rigid cellular core layer each adapted to remain at least substantially rigid during impact loading;

providing at least one sacrificial layer, said sacrificial layer adapted to deform during impact loading;

said first cellular layer and said second cellular layer adapted to interpenetrate during impact loading; and

said sacrificial layer adapted to impede interpenetration of said first cellular layer and said second cellular layer during impact loading.

40. The method of claim 39, wherein said sacrificial layer is adapted to provide plastic deformation prior to its own fracture due to the impact loading.

41. The method of claim 39, wherein said first cellular layer and said second cellular layers are made from a material selected from the group consisting of polymers, metals, and ceramics.

42. The method of claim 39, wherein said first cellular layer and said second cellular layers are made from composites selected from the group consisting of polymers, metals, and ceramics.

43. The method of claim 39, wherein said sacrificial layer is made from at least one material having a combination of high yield strength and ductility.

44. The method of claim 39, wherein said sacrificial layer is made from the same material as at least one of said first cellular layer and said second cellular layer.

45. The method of claim 39, wherein said structure comprises at least one of:

an architectural structure,

a civil engineering field structure,

a machine field structure,

an automobile structure,

a ship structure,

a freight car structure;

an aircraft structure,

a space station structure, or

a submarine, ship, or water craft structure.

46. The method of claim 45, wherein:

said architectural structure comprises at least one of

pillars, walls, shielding, foundations or floors for buildings or pillars, or wall shielding floors,

said civil engineering field structure comprises at least one of

road facilities such as noise resistant walls and crash barriers, road paving materials, permanent and portable aircraft landing runways, pipes, segment materials for tunnels, segment materials for underwater tunnels, tube structural materials, main beams of bridges, bridge floors, girders, cross beams of bridges, girder walls, piers, bridge substructures, towers, dikes and dams, guide ways, railroads, ocean structures such as breakwaters and wharf protection for harbor facilities, floating piers/oil excavation or production platforms, or airport structures such as runways,

said machine field structure comprises at least one of

frame structures for carrying system, carrying pallets, or frame structure for robots, etc.,

said automobile structure comprising at least one of

a body, frame, doors, chassis, roof and floor, side beams, or bumpers, etc.,

said ship structure comprising at least one of;

a main frame of the ship, body, deck, partition wall, or wall, etc.,

said freight car structure comprising at least one of

body, frame, floor, or wall, etc.,

said aircraft structure comprising at least one of

a wing, main frame, body, or floor, etc.,

said spacecraft comprising at least one of

a body, frame, floor, or wall, etc.,

said space station comprising at least one of

a main body, floor, or wall, etc., and

said submarine, ship, or water craft comprising at least one of

a body, or frame, etc.

47. A method of efficiently absorbing impact energy during impact loading on a structure, the method comprising:

providing the structure comprising a first cellular layer, a second cellular layer, and a sacrificial layer there between;

interpenetrating said first cellular layer and said second cellular layer with one another as said first cellular layer and a second cellular layer are subjected to the impact load; and

impeding the interpenetration of said first cellular layer and a second cellular layer with the sacrificial layer, wherein said sacrificial layer opposes the forces imposed by the interpenetration

48. The method of claim 47, wherein said structure comprises at least one of:

an architectural structure,

a civil engineering field structure,

a machine field structure,

an automobile structure,

a ship structure,

a freight car structure,

an aircraft structure,

a space station structure, or

a submarine, ship, or water craft structure.

49. The method of claim 48, wherein:

said architectural structure comprises at least one of

pillars, walls, shielding, foundations or floors for buildings or pillars, or wall shielding floors,

said civil engineering field structure comprises at least one of

road facilities such as noise resistant walls and crash barriers, road paving materials, permanent and portable aircraft landing runways, pipes, segment materials for tunnels, segment materials for underwater tunnels, tube structural materials, main beams of bridges, bridge floors, girders, cross beams of bridges, girder walls, piers, bridge substructures, towers, dikes and dams, guide ways, railroads, ocean structures such as breakwaters and wharf protection for harbor facilities, floating piers/oil excavation or production platforms, or airport structures such as runways,

said machine field structure comprises at least one of

frame structures for carrying system, carrying pallets, or frame structure for robots, etc.,

said automobile structure comprising at least one of

a body, frame, doors, chassis, roof and floor, side beams, or bumpers, etc.,

said ship structure comprising at least one of;

a main frame of the ship, body, deck, partition wall, or wall, etc.,

said freight car structure comprising at least one of

body, frame, floor, or wall, etc.,

said aircraft structure comprising at least one of

a wing, main frame, body, or floor, etc.,

said spacecraft comprising at least one of

a body, frame, floor, or wall, etc.,

said space station comprising at least one of

a main body, floor, or wall, etc., and

said submarine, ship, or water craft comprising at least one of

a body, or frame, etc.