Honeycomb core for dimensionally stable sandwich components

Patent metadata

Field	Value
Publication number	US-10836133-B2
Application number	US-201615231886-A
Country	US
Kind code	B2
Filing date	Aug 9, 2016
Priority date	Aug 14, 2015
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A honeycomb core for dimensionally stable components (e.g., a reflector) in sandwich construction with a plurality of cells with a triangular cell cross section made from carbon fiber reinforced plastic. The honeycomb core is assembled from flat laminate strips by plugging, wherein the laminate strips have slots running transversely to the extension direction respectively on their longitudinal side. The laminate strips are connected to one another in such a way that the slots of three laminate strips engage in a positive-locking manner in one another at a respective intersection point to form the corners of the cells of the honeycomb core.

First claim

The invention claimed is:

1. A honeycomb core for dimensionally stable panels and reflectors in a sandwich construction,
the honeycomb core comprising a plurality of cells with a triangular cell cross section made from carbon fiber reinforced plastic,
the honeycomb core being assembled from flat laminate strips connected to one another, the laminate strips being formed quasi-isotropic, the laminate strips each having first and second longitudinal sides forming lateral edges of the laminate strips and a width extending transversely between the first and second longitudinal sides,
the assembled laminate strips forming lateral cell walls of the plurality of cells, each cell of the plurality of cells formed by the assembled laminate strips have open upper and lower faces,
the laminate strips having slots running transversely to an extension direction of the first and second longitudinal sides,
the laminate strips made of cured carbon fiber reinforced plastic and being configured to be connected to one another in such a way that the slots of three laminate strips engage in a positive-locking manner in one another at a respective intersection point thereby forming the honeycomb core without the provision of further stabilizing elements, the respective intersection point forming respective corners of a cell of the plurality of cells of the honeycomb core;
wherein the laminate strips comprise
a number of laminate strips of a first type, which comprise first and second slots distributed at regular intervals, wherein the first slots extend, starting out from a first longitudinal side, by a third of the width transversely to the extension direction and wherein the second slots extend, starting out from a second longitudinal side, by a third of the width transversely to the extension direction, and wherein each first slot is aligned with a second slot;
a number of laminate strips of a second type, which comprise slots distributed at regular intervals, wherein the slots extend, starting out from a first longitudinal side, by two thirds of the width transversely to the extension direction; and
a number of laminate strips of a third type, which comprise slots distributed at regular intervals, wherein the slots extend, starting out from a second longitudinal side, by two thirds of the width transversely to the extension direction;
wherein the widths of the first type, the widths of the second type, and the widths of the third type of laminate strips are equal.

2. The honeycomb core according to claim 1 , wherein the spacings of the first and second slots of the laminate strips of the first type running in a transverse direction, the spacings of the slots of the laminate strips of the second type running in a transverse direction and the spacings of the slots of the laminate strips of the third type running in a transverse direction, are dimensioned in such a way that the spacings correspond to the length of the lateral edges of the triangular cell cross section.

3. The honeycomb core according to claim 1 , wherein the laminate strips of an identical type are arranged parallel to one another in the honeycomb core.

4. The honeycomb core according claim 1 , wherein the cells comprise equilateral triangles.

5. The honeycomb core according to claim 1 , wherein the laminate strips have an identical thickness to one another.

6. The honeycomb core according to claim 1 , wherein the slots engaging in one another of three laminate strips are fixed at an intersection point by an adhesive or a synthetic resin.

7. The honeycomb core according to claim 1 , wherein the lateral edges of the laminate strips of at least one main side of the honeycomb core lie in one plane following completed assembly.

8. The honeycomb core according to claim 1 , wherein a section of at least one of the laminate strips, which is arranged between two adjacent slots in the extension direction, comprises one or more openings.

9. A reflector in sandwich construction, for an optical mirror in lightweight construction, comprising a honeycomb core according to claim 1 .

10. A sandwich panel in lightweight construction, for dimensionally stable applications, comprising a honeycomb core according to claim 1 .

11. A method for the manufacture of a honeycomb core according to claim 1 , with the following steps:
a) providing a number of laminate strips of the first type, providing a number of laminate strips of the second type and providing a number of laminate strips of the third type;
b) arranging the number of laminate strips of the second type on a level base, so that their slots point away from the base;
c) inserting the number of laminate strips of the first type from above into the laminate strips of the second type, so that the slots of the laminate strips of the first type, which face the laminate strips of the second type, engage in the slots of the laminate strips of the second type;
d) inserting the number of laminate strips of the third type from above into the number of laminate strips of the first type, so that the slots of the laminate strips of the third type engage in the slots of the laminate strips of the first type, which face the laminate strips of the third type.

12. The method according to claim 11 , in which the number of laminate strips of the third type are arranged parallel on the base.

13. The method according to claim 11 , in which the number of laminate strips of the third type are arranged in a direction perpendicular to their respective extension direction with an equal spacing on the base.

14. The method according to claim 11 , in which the number of laminate strips of the second type is oriented in such a way that assigned slots of adjacent laminate strips of the third type form a line.

Assignees

• Airbus Ds Gmbh

Inventors

• Stute Thomas

Classifications

• B32B5/02

  characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} · CPC title

• B32B2398/10

  Thermosetting resins · CPC title

• B32B2551/08

  Mirrors · CPC title

• G02B5/08

  Mirrors {(vehicle mirrors involving special optical features B60R1/08)} · CPC title

• B32B2307/734

  Dimensional stability · CPC title