AERONAUTICAL LAMINATED GLAZING WITH HIGH RESISTANCE TO BREAKING ON BIRD STRIKE

Abstract

A laminated glazing for a vehicle or a building, includes an inner structural polymer material sheet and an outer structural glass sheet having a breaking stress of from 350 to 1000 MPa under the stress characteristics of a bird strike.

Claims

1. A laminated glazing for a vehicle or a building, comprising an inner structural polymer material sheet and an outer structural glass sheet with a thickness of between 3 and 20 mm having a breaking stress of from 350 to 1000 MPa under the stress characteristics of a bird strike.

2. The laminated glazing as claimed in claim 1, wherein the inner structural polymer material sheet is made of stretched or unstretched poly(methyl methacrylate) (PMMA), of structural polyurethane (PU) or of polycarbonate (PC), with a thickness of between 5 and 22 mm.

3. The laminated glazing as claimed in claim 1, wherein the outer structural glass sheet is made of soda-lime or aluminosilicate glass.

4. The laminated glazing as claimed in claim 1, wherein the outer structural glass sheet is chemically reinforced.

5. The laminated glazing as claimed in claim 1, wherein the inner and outer structural sheets are bonded to one another by means of a first adhesive interlayer having a thickness of between 0.5 and 5 mm.

6. The laminated glazing as claimed in claim 1, comprising, on a side of the outer structural glass sheet opposite the inner structural polymer material sheet, an outer glass sheet having a thickness of between 0.5 and 5 mm.

7. The laminated glazing as claimed in claim 6, wherein the outer glass sheet has a soda-lime or aluminosilicate composition.

8. The laminated glazing as claimed in claim 6, wherein the outer glass sheet is semi-tempered or chemically reinforced.

9. The laminated glazing as claimed in claim 6, wherein the outer glass sheet is bonded to the outer structural glass sheet by means of a second adhesive interlayer having a thickness of between 2 and 12 mm.

10. The laminated glazing as claimed in claim 6, wherein the face of the outer glass sheet oriented toward the outer structural glass sheet supports a network of heating wires and/or an electrically-conductive heating layer.

11. The laminated glazing as claimed in claim 1, wherein one face of the inner or outer structural sheet supports a network of heating wires and/or an electrically-conductive heating layer.

12. The laminated glazing as claimed in claim 6, wherein the face of the outer glass sheet opposite the outer structural glass sheet is flush with the assembly structure.

13. The laminated glazing as claimed in claim 5, wherein an adhesive interlayer comprises a polyvinyl butyral, a polyurethane, an ethylene/vinyl acetate copolymer or the like.

14. The laminated glazing as claimed in claim 1, wherein the laminated glazing is curved.

15. The laminated glazing as claimed in claim 1, comprising a reinforcing sheet that is inserted between the inner and outer structural glass sheets, over a portion at least of a peripheral zone of the laminated glazing.

16. A method comprising utilizing a laminated glazing as claimed in claim 1 in aeronautics.

17. The method as claimed in claim 16, wherein the laminated glazing is a commercial, regional or business aircraft glazing subject to the requirements of bird strike resistance.

18. The laminated glazing as claimed in claim 5, wherein the thickness of the first adhesive interlayer is between 1.8 and 3.2 mm.

19. The laminated glazing as claimed in claim 9, wherein the thickness of the second adhesive interlayer is between 3 and 7 mm.

Description

EXAMPLE

[0039] A laminated glazing of pressurized commercial aircraft cockpit consists, from the inside of the aircraft outward: [0040] of a 10-mm thick inner structural sheet of stretched PMMA; [0041] of an 8-mm thick outer structural sheet of chemically reinforced soda-lime glass having a breaking stress of 500 MPa; and [0042] of a semi-tempered (surface stress of 50 MPa) 3-mm thick outer soda-lime glass sheet.

[0043] The two structural sheets are bonded by means of a 2-mm thick PVB adhesive interlayer.

[0044] The outer structural glass sheet and the outer glass sheet are bonded by means of a 10-mm thick PU adhesive interlayer.

[0045] The face of the outer glass sheet oriented toward the outer structural glass sheet bears a deicing heating layer of ITO. This is in particular the case for a frontal deicing glazing of an aircraft cockpit. As specified above, in the case of a demisting glazing, the heating function may be supported by any surface of the structural block in the laminate.

[0046] The outer face of the outer glass sheet is flush with the body of the aircraft, assembly environment of the laminated glazing.

[0047] This laminated glazing has improved bird strike resistance.