DE102005037055A1 - Core structure for sandwich panels is made up of honeycomb of Y-shaped, twelve-sided pieces, allowing panels to curve around one axis or two axes simultaneously - Google Patents
Core structure for sandwich panels is made up of honeycomb of Y-shaped, twelve-sided pieces, allowing panels to curve around one axis or two axes simultaneously Download PDFInfo
- Publication number
- DE102005037055A1 DE102005037055A1 DE200510037055 DE102005037055A DE102005037055A1 DE 102005037055 A1 DE102005037055 A1 DE 102005037055A1 DE 200510037055 DE200510037055 DE 200510037055 DE 102005037055 A DE102005037055 A DE 102005037055A DE 102005037055 A1 DE102005037055 A1 DE 102005037055A1
- Authority
- DE
- Germany
- Prior art keywords
- honeycomb
- panels
- dodecagon
- twelve
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
- E04C2/365—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels by honeycomb structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
- B32B2262/0269—Aromatic polyamide fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
Abstract
Description
1. Der technische Stand/Das Problem:1. The technical state / Das Problem:
Das Prinzip einer Sandwichbauweise beruht darauf, dass zwischen zwei dünnen Decklagen ein leichtes, druck- und schubfestes Kernmaterial eingebracht wird. Dadurch kann bei geringem Materialeinsatz und minimalem Gewicht eine große Wandstärke realisiert werden, die eine hohe Steifigkeit erreicht. Als Deckschichtmaterialien für eine solche Bauweise sind besonders dünne GFK-Laminate geeignet. Je nach Anforderungsprofil können natürlich auch SFK- oder CFK-Laminate verwendet werden.The Principle of a sandwich construction based on the fact that between two thin Cover layers introduced a lightweight, pressure and shear resistant core material becomes. This allows for low material usage and minimal weight a big Wall thickness realized which achieves a high rigidity. As cover layer materials for one Such construction is particularly thin GRP laminates suitable. Of course, depending on the requirements SFK or CFK laminates are used.
Beim Kernwerkstoff wurden bislang die besten Ergebnisse mit Aramid-Wabenkernen (den sog. Honeycombs oder Nomex-Waben) erzielt. Sie sind anderen Stützstoffen wie Balsaholz und Schaumstoffen aufgrund des geringeren Gewichtes, der höheren mechanischen Festigkeit und der guten Verklebbarkeit deutlich überlegen.At the Core material has so far been the best results with aramid honeycomb cores achieved (the so-called honeycombs or Nomex honeycombs). They are different support materials like balsa wood and foams due to the lower weight, the higher mechanical Strength and the good bondability clearly superior.
Ein Problem dieser Aramid-Wabe besteht allerdings in ihrer schlechten Verformbarkeit, welche in der Struktur der Wabe begründet ist.One Problem of this aramid honeycomb, however, is in their bad Deformability, which is due to the structure of the honeycomb.
Krümmt man
die Wabe in einer Achse, so dehnt sich die Struktur in der Zugzone
in der belasteten Achse. Aufgrund dieser Dehnung staucht sich die Struktur
nun in der unbelasteten Achse orthogonal dazu (
In
der Druckzone wird die Struktur in der belasteten Achse gestaucht,
und dies führt
wiederum zu einer Dehnung in der unbelasteten Achse (
Dieses Verformungsverhalten ist für die meisten Anwendungsgebiete der Sandwichbauweise nachteilhaft, da komplexere zweiachsige Krümmungen nicht zu erreichen sind.This Deformation behavior is for most applications of sandwich construction disadvantageous, because more complex biaxial curvatures can not be reached.
Bei
einer zweiachsigen Krümmung,
bei der beide Krümmungsradien
den Ursprung auf der gleichen Seite haben (z.B.
Je größer die Höhe des Kernmaterials ist, desto größer ist auch die Flächendifferenz zwischen der Druck- und der Zugseite. Dem entsprechend vergrößern sich auch die Spannungen.ever bigger the Height of Core material is the bigger also the area difference between the pressure and the tension side. The corresponding increase also the tensions.
Die
Honeycomb-Wabe hat strukturbedingt keine Möglichkeit, allseitig an Fläche zu gewinnen oder
zu verlieren. In der Zugzone müsste
sich die Seitenlänge
und damit auch der Umfang der Wabe vergrößern (
Zwängt man sie dennoch in eine solche zweiachsige Krümmung, so knickt die Wabenstruktur in unregelmäßigen Abständen ein. Eine saubere Rundung ist nicht zu erreichen.You force Nevertheless, in such a biaxial curvature, so kinks the honeycomb structure in irregular intervals. A clean rounding can not be achieved.
2. Die Lösung/Die Zwölfeck-Struktur:2. The solution / Die Zwölfeck structure:
Das Problem der zweiachsigen Krümmung und der Verformbarkeit von Sandwichflächen kann durch eine neue Kernstruktur an Stelle der Honeycomb-Wabe gelöst werden.The Problem of biaxial curvature and The deformability of sandwich surfaces may be due to a new core structure solved in place of the honeycomb honeycomb become.
Die
Lösung
besteht aus einer zweidimensional wiederholten Zwölfeck-Struktur,
wobei in einem Zwölfeck
(sofern keine Verformung besteht) die zwölf Seiten gleicher Länge abwechselnd
drei Innenwinkel 120° und
darauf folgend einen Innenwinkel 240° aufweisen (perspektivisch dargestellt
in
Die Gesamtstruktur ergibt sich aus mehreren dieser Zwölfecke, die durch Verschiebung (und nicht durch Drehung) aneinander gegliedert sind, wobei vom Mittelpunkt M eines Zwölfecks die Mittelpunkte der sechs Nachbar-Zwölfecke auf den Geraden liegen, die von M aus durch die drei von M am weitesten entfernten und die drei von M aus nächsten Ecken gehen.The Forest arises from several of these dodecagons, which are articulated by displacement (not by rotation) are, from the center M of a dodecagon, the centers of six neighbor dodecagons on lie on the straight lines which, from M, are the farthest from the three of M. and the three from M out next Go corners.
Diese Zwölfeckstruktur kann bei Beibehaltung der Seitenlängen auf den gegenüberliegenden Seiten eines Sandwiches auf Verformungen frei reagieren, durch spannungsfreie, rein geometrische Veränderungen der Struktur, mit dem Gewinn an Fläche auf der einen Seite und dem Verlust an Fläche auf der anderen. Ebenso wie die Seitenlänge und der Umfang des Zwölfecks bleibt je nach Krümmung aber auch die Regelmäßigkeit des Musters auf beiden Seiten erhalten. Bei unregelmäßigen Verformungen reagiert das Zwölfeckmuster durch kontinuierliche Anpassung in den Winkeln des Zwölfecks und damit im Flächeninhalt der Zwölfeckstruktw.This dodecagonal structure, while maintaining the side lengths on the opposite sides of a sandwich, is free to react to deformations, stress-free, purely geometric changes in structure, gain in area on one side, and loss of area the other. As well as the side length and the circumference of the dodecagon, the regularity of the pattern on both sides also remains, depending on the curvature. In irregular deformations, the dodecagon pattern responds by continuous adaptation in the angles of the dodecagon and thus in the surface area of the dodecagon structure.
In
der Druckzone (z.B. in
Die
Zugzone (z.B. in
In
Im Allgemeinen gilt, je kleiner der Krümmungsradius und/oder je größer die Kernhöhe des Sandwiches ist, desto größer die geometrische Verformung der Struktur. Bei einer größeren Kernhöhe steigt folglich der Wert des minimal zu erreichenden Krümmungsradius.in the Generally, the smaller the radius of curvature and / or the larger the core height the sandwich is, the bigger the geometric deformation of the structure. At a higher core height increases hence the value of the minimum radius of curvature to be achieved.
Bei einer Kernhöhe von 5cm ist ein zweiachsiger Krümmungsradius von jeweils 30cm, unabhängig von der Seitenlängenskalierung der Zwöfeck-Struktur (der denkbare Bereich liegt zwischen 3-20mm) leicht zu erreichen. Entsprechende Modellversuche mit doppelwandigem 300g Papier haben das bereits erwiesen.at a core height of 5cm is a biaxial radius of curvature each 30cm, independent from the page length scaling the Zwöfeck structure (the conceivable range is between 3-20mm) easy to reach. Corresponding model tests with double-walled 300g paper have the already proved.
Bei der Herstellung im Modell haben sich bislang zwei Additionsmöglichkeiten bewährt um die Struktur zusammenzusetzen.
- 1. ist es
möglich
einzelne Zwölfecke
anzufertigen und diese dann in der oben beschriebenen Anordnung
zu addieren (
11 ). Auf diese Weise erhält man einen einheitlichen, doppelwandigen Strukturaufbau. Folglich erreicht man ein äußerst homogenes Gefüge. - 2. kann die Produktion mit der Zusammensetzung einzelner Streifen,
die aus einer sich wiederholenden Anordnung von jeweils um 120° geknickten Seiten
bestehen, wobei sich eine Wiederholungsfolge aus 2 konkaven, 3 konvexen,
2 konkaven und einer konvexen Knickrichtung ausbildet, erfolgen.
Die einzelnen Streifen werden jeweils um die Hälfte der Breite eines Zwölfecks verschoben
und aufeinander gesetzt (
12 ).
- 1. it is possible to make individual dodecagons and then add them in the arrangement described above (
11 ). In this way one obtains a uniform, double-walled structure structure. Consequently, one achieves an extremely homogeneous structure. - 2. Production may be carried out with the composition of individual strips consisting of a repeating arrangement of sides each bent by 120 °, with a repetitive sequence consisting of two concave, three convex, two concave and one convex kinking direction. The individual strips are each shifted by half the width of a dodecagon and placed on top of each other (
12 ).
Anwendungsbeispiele:Application examples:
Die Zwölfeck-Kernstruktur kann als Sandwich überall dort eingesetzt werden, wo organische Formen modelliert werden müssen, die eine hohe Steifigkeit bei geringem Gewicht erreichen sollen. Zum Beispiel im Flugzeugbau, insbesondere für die zweiachsig gekrümmte Nase, aber auch in der Architektur für organisch geformte Fassaden oder Dächer. Dort kann der Hohlraum der Struktur mit Dämmmaterial aufgefüllt werden. Im medizinischen Bereich könnte ein weiteres Anwendungsgebiet für die Struktur bestehen. Sie hat durch ihr geringes Gewicht und durch ihre Fähigkeit sich an sämtliche Körperteile anzupassen klare Vorteile gegenüber herkömmlichen Verbänden und Prothesen orthopädischer Funktion.The Zwölfeck core structure Can be used as a sandwich everywhere where organic forms need to be modeled to achieve a high rigidity with low weight. To the Example in the aircraft industry, especially for the biaxially curved nose, but also in architecture for organically shaped facades or roofs. There can be the cavity the structure with insulation material filled become. In the medical field could be another field of application for the Structure exist. She has through her light weight and through her ability to all Body Parts to adapt to clear advantages conventional associations and Prostheses orthopedic Function.
Die Struktur ist in der Steifigkeit mit der Honeycomb-Wabe annähernd gleichzusetzen und könnte diese, aufgrund ihrer viel besseren Flexibilität, im Grunde ablösen. Ihre Skalierung in Höhe und Durchmesser ist je nach Anwendungsgebiet in verschiedenen Größen denkbar.The Structure is approximately equal in stiffness to the honeycomb honeycomb and could These, because of their much better flexibility, basically replace them. Your Scaling in height and diameter is possible depending on the application in different sizes.
Als Material ist im Zusammenhang mit Faserverbundwerkstoffen Nomex®-Papier sinnvoll, in dem Aramidfasern mit Phenolharz gebunden sind. Die Herstellung aus Blech ist ebenfalls denkbar und für Anwendungsgebiete geeignet, bei denen eine plastische Verformung erforderlich ist. Der Kern könnte so frei modelliert werden und sich bei der Verarbeitung selbst in Form halten.As a material in connection with fiber composites Nomex ® paper makes sense, are bound in the aramid fibers with phenolic resin. The production of sheet metal is also conceivable and suitable for applications in which a plastic deformation is required. The core could be freely modeled and kept in shape during processing.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510037055 DE102005037055A1 (en) | 2005-08-05 | 2005-08-05 | Core structure for sandwich panels is made up of honeycomb of Y-shaped, twelve-sided pieces, allowing panels to curve around one axis or two axes simultaneously |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510037055 DE102005037055A1 (en) | 2005-08-05 | 2005-08-05 | Core structure for sandwich panels is made up of honeycomb of Y-shaped, twelve-sided pieces, allowing panels to curve around one axis or two axes simultaneously |
Publications (1)
Publication Number | Publication Date |
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DE102005037055A1 true DE102005037055A1 (en) | 2007-02-08 |
Family
ID=37670040
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DE200510037055 Withdrawn DE102005037055A1 (en) | 2005-08-05 | 2005-08-05 | Core structure for sandwich panels is made up of honeycomb of Y-shaped, twelve-sided pieces, allowing panels to curve around one axis or two axes simultaneously |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170307138A1 (en) * | 2016-04-26 | 2017-10-26 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10220881B2 (en) | 2016-08-26 | 2019-03-05 | Ford Global Technologies, Llc | Cellular structures with fourteen-cornered cells |
US10279842B2 (en) | 2016-08-30 | 2019-05-07 | Ford Global Technologies, Llc | Twenty-eight-cornered strengthening member for vehicles |
US10300947B2 (en) | 2016-08-30 | 2019-05-28 | Ford Global Technologies, Llc | Twenty-eight-cornered strengthening member for vehicles |
US10315698B2 (en) | 2015-06-24 | 2019-06-11 | Ford Global Technologies, Llc | Sixteen-cornered strengthening member for vehicles |
US10429006B2 (en) | 2016-10-12 | 2019-10-01 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10473177B2 (en) | 2016-08-23 | 2019-11-12 | Ford Global Technologies, Llc | Cellular structures with sixteen-cornered cells |
US10611409B2 (en) | 2008-09-19 | 2020-04-07 | Ford Global Technologies, Llc | Twelve-cornered strengthening member |
US10704638B2 (en) | 2016-04-26 | 2020-07-07 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US11167520B2 (en) * | 2015-12-29 | 2021-11-09 | Textron Innovations Inc. | Composite core with non-traditional geometries |
US11292522B2 (en) | 2019-12-04 | 2022-04-05 | Ford Global Technologies, Llc | Splayed front horns for vehicle frames |
-
2005
- 2005-08-05 DE DE200510037055 patent/DE102005037055A1/en not_active Withdrawn
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10611409B2 (en) | 2008-09-19 | 2020-04-07 | Ford Global Technologies, Llc | Twelve-cornered strengthening member |
US10315698B2 (en) | 2015-06-24 | 2019-06-11 | Ford Global Technologies, Llc | Sixteen-cornered strengthening member for vehicles |
US11167520B2 (en) * | 2015-12-29 | 2021-11-09 | Textron Innovations Inc. | Composite core with non-traditional geometries |
US20170307138A1 (en) * | 2016-04-26 | 2017-10-26 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10393315B2 (en) * | 2016-04-26 | 2019-08-27 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10948000B2 (en) | 2016-04-26 | 2021-03-16 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10704638B2 (en) | 2016-04-26 | 2020-07-07 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US10473177B2 (en) | 2016-08-23 | 2019-11-12 | Ford Global Technologies, Llc | Cellular structures with sixteen-cornered cells |
US10220881B2 (en) | 2016-08-26 | 2019-03-05 | Ford Global Technologies, Llc | Cellular structures with fourteen-cornered cells |
US10300947B2 (en) | 2016-08-30 | 2019-05-28 | Ford Global Technologies, Llc | Twenty-eight-cornered strengthening member for vehicles |
US10538271B2 (en) | 2016-08-30 | 2020-01-21 | Ford Global Technologies, Llc | Twenty-eight-cornered strengthening member for vehicles |
US10279842B2 (en) | 2016-08-30 | 2019-05-07 | Ford Global Technologies, Llc | Twenty-eight-cornered strengthening member for vehicles |
US10429006B2 (en) | 2016-10-12 | 2019-10-01 | Ford Global Technologies, Llc | Cellular structures with twelve-cornered cells |
US11292522B2 (en) | 2019-12-04 | 2022-04-05 | Ford Global Technologies, Llc | Splayed front horns for vehicle frames |
US11807303B2 (en) | 2019-12-04 | 2023-11-07 | Ford Global Technologies, Llc | Splayed front horns for vehicle frames |
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