# US 7,608,318 B2 · Sandwich panel

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- Number: US 7,608,318 B2
- Document ID: US7608318B2
- Status: Granted
- Kind: B2
- Application number: 10/582,784
- Filed: 2003-12-17
- Published: 2007-06-28
- Granted: 2009-10-27
- Earliest claimed: 2003-12-17
- Assignees: Airbus SAS; Otkrytoe Aktsionernoe Obschestvo “Kazansky Nauchno-Isledovatelsky Institut Aviatsionnoi Tekhnologii”
- Inventors: Niaz Irekovich Akishev; Ildus Muhametgaleevich Zakirov; Alexandr Vladimirovich Nikitin
- Web page: https://patentgrep.com/patent/US7608318B2

## CPC

- B32B 3/28: characterised by a layer comprising a deformed thin sheet {, i.e. the layer having its entire thickness deformed out of the plane}, e.g. corrugated, crumpled (B32B29/08 takes precedence)
- E04C 2/3405: {spaced apart by profiled spacer sheets}
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2419/00: Buildings or parts thereof
- E04C 2002/345: {with triangular corrugations}
- Y10T 156/1015: Folding
- Y10T 156/1016: Transverse corrugating
- Y10T 428/24331: including nonapertured component
- Y10T 428/24669: Aligned or parallel nonplanarities
- Y10T 428/24694: Parallel corrugations
- Y10T 428/24702: with locally deformed crests or intersecting series of corrugations
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention can be defined in its most general form as a building unit, namely the sandwich panel with light core from corrugated sheet material in the form of zigzag crimp, and can be used in aircraft construction, as well as in shipbuilding and construction. Making use of the claimed invention will improve the weight efficiency, the strength and the manufacturability of the panel. The beneficial effect is attained due to the fact that the plane slanting ridges are connected along the protrusion and recess zigzag lines by means of curvilinear parts, whose radius is not less than the core material thickness, whereby along said parts is a line perforation enabling the adhesive material to get into the holes of the perforation in the course of core-skins assembling.

## Claims

### Claim 1

A sandwich panel, comprising:
two skins; and
a zigzag corrugated core having alternating protrusions and recesses extending between the skins and connected to the skins by an adhesive composite material, wherein
the core is a folded core made from a sheet blank with protrusions zigzag bending lines, recesses zigzag bending lines, and saw-tooth bending lines crossing the zigzag bending lines,
plane slanting sides of the folded core are connected to each other along the protrusions zigzag bending lines and the recesses zigzag bending lines by curvilinear parts whose folded core radius along the zigzag bending lines is not less than a core material sheet blank thickness,
perforation lines provided along the zigzag bending lines enable penetration of the adhesive material through holes of the perforation lines and into crimps, and
the adhesive material forms a head and body of a rivet in the crimps during assembly of the core and the skins.

### Claim 2 (depends on 1)

The sandwich panel core according to claim 1, formed by a process comprising:
forming perforation lines on the sheet blank along the zigzag bending lines;
bending the sheet blank along the zigzag bending lines;
applying the adhesive material into each of the perforation lines;
applying the skins to the top and bottom of the core; and
bonding the skins to the core at locations of the perforation holes.

### Claim 3 (depends on 1)

The sandwich panel core according to claim 1, wherein
ridges serve as surfaces of bonding between the core and the skins.