CA2370777A1 - Collapsible cellular structure - Google Patents
Collapsible cellular structure Download PDFInfo
- Publication number
- CA2370777A1 CA2370777A1 CA002370777A CA2370777A CA2370777A1 CA 2370777 A1 CA2370777 A1 CA 2370777A1 CA 002370777 A CA002370777 A CA 002370777A CA 2370777 A CA2370777 A CA 2370777A CA 2370777 A1 CA2370777 A1 CA 2370777A1
- Authority
- CA
- Canada
- Prior art keywords
- honeycomb structure
- sheets
- strips
- knitted
- abutting
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/002—Resistance welding; Severing by resistance heating specially adapted for particular articles or work
- B23K11/0033—Welding locally a thin plate to a large piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
- B23K26/22—Spot welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/02—Honeycomb structures
Abstract
A novel honeycomb cellular structure fabricated from metallic knitted or woven mesh having good manufacturability and the ability to be crushed and collapsed and subsequently re-opened and dismantled. Metal alloys of phosphor bronze, nickel-based alloys, stainless steels, and nickel and copper alloys are particularly suited.
Description
COLLAPSIBLE CELLULAR STRUCTURE
BACKGROUND OF THE INVENTION
(i) Field of the Invention The present invention relates to a collapsible cellular or honeycomb structure and, more particularly, relates to novel cellular or honeycomb structures of metallic knitted or woven mesh capable of being crushed.
(ii) Description of the Related Art Cellular structures made from thin sheet metal or metal foil are known for use in space and aerospace applications, in particular in jet engines, because they provide a high stiffness to weight ratio and high mechanical energy absorption capabilities and acoustic damping while being light in weight.
U.S. Patent No. 3,867,061 issued February 18, 1975 typifies a conventional prior art honeycomb shroud for rotor blades for turbines in which the honeycomb cell walls are made from nickel-base heat-resistant alloys and the honeycomb strips are brazed or resistance welded to a back-up ring.
U:S. Patent No. 4063,742 issued December 20, 1977 discloses another embodiment of prior art abradable fluid seal for use in gas turbines consisting of a conventional honeycomb made by conventional honeycomb equipment in which abutting three-sided semi-hexagonal strips each having a pair of flat slanted sides and a flat crest of equal length standing on edge are resistance welded together at the crests.
Honeycomb structures typically are fabricated by building up the structure layer by layer to result in a three dimensional body having a height determined by the width to which the ribbon had been slit prior to corrugation. The length of the structure is parallel to the plane of the double walls or nodes and the width is represented by the direction of layer build up. Such a cellular body is brazed to face sheets to form a sandwich skin or brazed to backplates of a ring or ring segments to form a seal. Such brazing does not only join the cellular structure body to the face sheet or backplate but also contributes significantly to the stiffness of the cellular structure itself. This is due to the fact that the brazing alloy, in a liquid state and due to capillary action, rises up the gap formed by the two neighbouring walls of the node, thereby wetting the abutting surfaces of said node walls and, after resolidification of the braze filler metal, forms a stiffened cellular structure. The braze flow up the nodal walls is referred to as "wicking". Such wicking is essential to provide a brazed cellular structure with good mechanical behaviour at high temperatures to resist combined thermal and mechanical loads.
It is an object of the present invention, on the other hand, to provide a light-weight, collapsible, metallic cellular structure which can be subsequently re-opened and dismantled.
It is another object of the present invention to provide a light-weight, collapsible, cellular structure such as a honeycomb structure capable of receiving and housing electrical wires and cables for providing effective shielding and grounding of the wires and cables.
Summary of the Invention In accordance with the present invention there are provided novel cellular structures made from knitted or woven metal wire mesh having weak structural strength and poor stiffness to permit facile crushing and collapse while allowing the structures to be easily re-opened and dismantled.
In its broadest form this is achieved through a cellular honeycomb structure which comprises a plurality of abutting semi-hexagonal strips or sheets of knitted or woven metal mesh, each having alternating flat slanted sides interconnected by a flat crest, the abutting strips joined together at the adjacent flat crests by resistance or laser welds to form generally hexagonal cells having double wall crests or nodes, the slanted sides and crests preferably having an equal length.
Preferably the strips or sheets are knitted or woven thin wires of phosphor bronze, nickel-based alloys, stainless steels, or nickel and copper alloys. A
pair of abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven metal mesh can be joined together at adjacent flat crests by resistance or laser spot welds to define a row of equispaced cells for receiving wires therein.
More than two abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven mesh can be joined together at adjacent flat crests by resistance or laser spot welds to define adjacent rows of cells for receiving a bundle of wires therein.
The novel crushable honeycomb structure of the invention can be used for shielding and grounding electrical wires and cables such as through bulkheads in aircraft and boats.
Brief Description of the Drawings The crushable honeycomb structure of the invention will now be described with reference to the accompanying drawing, in which:
Figure 1 is a plan view of the honeycomb cellular structure of the invention.
Description of the Preferred Embodiments Referring to the drawing, Figure 1 illustrates a honeycomb cellular structure 10 fabricated from a plurality of metal strips or sheets 12 of corrugated knitted or woven metal mesh having a three-sided, semi-hexagon shape consisting of a pair of flat slanted sides 14, 16 interconnected by adjacent intermediary flat crests 18, 19.
Sides 14, 16 and crests 18, 19 preferably are of equal length. The adjacent strips 12, 12a, 12b, 12c are joined together at their abutting crests 18, 19 such as by resistance welds or by laser spot welds 21 to form the three-dimensional body 10. The joining of more than two adjacent strips or sheets together, such as strips or sheets 12a, 12b and 12c , as typified in Figure l, provides a plurality of adjacent cells depicted by numerals 20a, 20b, 20c and 20d for receiving a bundle or bundles of wires or cables therein, not shown. The joining of a pair of adjacent strips or sheets together, such as strips or sheets 12a and 12b, provides a row of equispaced cells such as cells 20a and 20b for receiving a row of equispaced wires therein.
The strips or sheets of knitted or woven mesh preferably are produced from thin wires of phosphor bronze, nickel and copper alloys such as MONEL TM, nickel-base alloys or stainless steels. The resulting honeycomb mesh can receive electrical wires or cables through the cells, such as in aircraft bulkhead installations, and the honeycomb structure crushed to effectively shield and electrically ground the wires and cables therein. The crushed honeycomb structure can be easily re-opened to allow dismantling of the installations for re-use.
It will be understood, of course, that modifications can be made in the embodiments of the invention illustrated and described herein without departing from the scope and purview of the invention as defined by the appended claims.
BACKGROUND OF THE INVENTION
(i) Field of the Invention The present invention relates to a collapsible cellular or honeycomb structure and, more particularly, relates to novel cellular or honeycomb structures of metallic knitted or woven mesh capable of being crushed.
(ii) Description of the Related Art Cellular structures made from thin sheet metal or metal foil are known for use in space and aerospace applications, in particular in jet engines, because they provide a high stiffness to weight ratio and high mechanical energy absorption capabilities and acoustic damping while being light in weight.
U.S. Patent No. 3,867,061 issued February 18, 1975 typifies a conventional prior art honeycomb shroud for rotor blades for turbines in which the honeycomb cell walls are made from nickel-base heat-resistant alloys and the honeycomb strips are brazed or resistance welded to a back-up ring.
U:S. Patent No. 4063,742 issued December 20, 1977 discloses another embodiment of prior art abradable fluid seal for use in gas turbines consisting of a conventional honeycomb made by conventional honeycomb equipment in which abutting three-sided semi-hexagonal strips each having a pair of flat slanted sides and a flat crest of equal length standing on edge are resistance welded together at the crests.
Honeycomb structures typically are fabricated by building up the structure layer by layer to result in a three dimensional body having a height determined by the width to which the ribbon had been slit prior to corrugation. The length of the structure is parallel to the plane of the double walls or nodes and the width is represented by the direction of layer build up. Such a cellular body is brazed to face sheets to form a sandwich skin or brazed to backplates of a ring or ring segments to form a seal. Such brazing does not only join the cellular structure body to the face sheet or backplate but also contributes significantly to the stiffness of the cellular structure itself. This is due to the fact that the brazing alloy, in a liquid state and due to capillary action, rises up the gap formed by the two neighbouring walls of the node, thereby wetting the abutting surfaces of said node walls and, after resolidification of the braze filler metal, forms a stiffened cellular structure. The braze flow up the nodal walls is referred to as "wicking". Such wicking is essential to provide a brazed cellular structure with good mechanical behaviour at high temperatures to resist combined thermal and mechanical loads.
It is an object of the present invention, on the other hand, to provide a light-weight, collapsible, metallic cellular structure which can be subsequently re-opened and dismantled.
It is another object of the present invention to provide a light-weight, collapsible, cellular structure such as a honeycomb structure capable of receiving and housing electrical wires and cables for providing effective shielding and grounding of the wires and cables.
Summary of the Invention In accordance with the present invention there are provided novel cellular structures made from knitted or woven metal wire mesh having weak structural strength and poor stiffness to permit facile crushing and collapse while allowing the structures to be easily re-opened and dismantled.
In its broadest form this is achieved through a cellular honeycomb structure which comprises a plurality of abutting semi-hexagonal strips or sheets of knitted or woven metal mesh, each having alternating flat slanted sides interconnected by a flat crest, the abutting strips joined together at the adjacent flat crests by resistance or laser welds to form generally hexagonal cells having double wall crests or nodes, the slanted sides and crests preferably having an equal length.
Preferably the strips or sheets are knitted or woven thin wires of phosphor bronze, nickel-based alloys, stainless steels, or nickel and copper alloys. A
pair of abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven metal mesh can be joined together at adjacent flat crests by resistance or laser spot welds to define a row of equispaced cells for receiving wires therein.
More than two abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven mesh can be joined together at adjacent flat crests by resistance or laser spot welds to define adjacent rows of cells for receiving a bundle of wires therein.
The novel crushable honeycomb structure of the invention can be used for shielding and grounding electrical wires and cables such as through bulkheads in aircraft and boats.
Brief Description of the Drawings The crushable honeycomb structure of the invention will now be described with reference to the accompanying drawing, in which:
Figure 1 is a plan view of the honeycomb cellular structure of the invention.
Description of the Preferred Embodiments Referring to the drawing, Figure 1 illustrates a honeycomb cellular structure 10 fabricated from a plurality of metal strips or sheets 12 of corrugated knitted or woven metal mesh having a three-sided, semi-hexagon shape consisting of a pair of flat slanted sides 14, 16 interconnected by adjacent intermediary flat crests 18, 19.
Sides 14, 16 and crests 18, 19 preferably are of equal length. The adjacent strips 12, 12a, 12b, 12c are joined together at their abutting crests 18, 19 such as by resistance welds or by laser spot welds 21 to form the three-dimensional body 10. The joining of more than two adjacent strips or sheets together, such as strips or sheets 12a, 12b and 12c , as typified in Figure l, provides a plurality of adjacent cells depicted by numerals 20a, 20b, 20c and 20d for receiving a bundle or bundles of wires or cables therein, not shown. The joining of a pair of adjacent strips or sheets together, such as strips or sheets 12a and 12b, provides a row of equispaced cells such as cells 20a and 20b for receiving a row of equispaced wires therein.
The strips or sheets of knitted or woven mesh preferably are produced from thin wires of phosphor bronze, nickel and copper alloys such as MONEL TM, nickel-base alloys or stainless steels. The resulting honeycomb mesh can receive electrical wires or cables through the cells, such as in aircraft bulkhead installations, and the honeycomb structure crushed to effectively shield and electrically ground the wires and cables therein. The crushed honeycomb structure can be easily re-opened to allow dismantling of the installations for re-use.
It will be understood, of course, that modifications can be made in the embodiments of the invention illustrated and described herein without departing from the scope and purview of the invention as defined by the appended claims.
Claims
-5-(1) A crushable honeycomb structure comprising a plurality of abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven metal mesh each having alternating flat slanted sides interconnected by a flat crest, the abutting strips or sheets joined together at adjacent flat crests by welding to form generally hexagonal cells:
(2) A honeycomb structure as claimed in claim 1, wherein the slanted sides and crests have substantially the same length.
(3) A honeycomb structure as claimed in claim 1, wherein the strips or sheets are knitted or woven wires of phosphor bronze, nickel-based alloys, nickel and copper alloy or stainless steels.
(4) A honeycomb structure as claimed in claim 1, 2 or 3 in which the honeycomb structure is easily crushable and re-openable.
(5) A honeycomb structure as claimed in claim 1, 2, 3 or 4 in which the abutting strips, or sheets are joined together at adjacent flat crests by resistance or laser spot welds.
(6) A crushable honeycomb structure as claimed in claim 4 in which a pair of abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven metal mesh are joined together at adjacent flat crests by resistance or laser spot welds to define a row of equispaced cells for receiving wires therein.
(7) A crushable honeycomb structure as claimed in claim 4 in which more than two abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven mesh are joined together at adjacent flat crests by resistance or laser spot welds to define adjacent rows of cells for receiving a bundle of wires therein.
(2) A honeycomb structure as claimed in claim 1, wherein the slanted sides and crests have substantially the same length.
(3) A honeycomb structure as claimed in claim 1, wherein the strips or sheets are knitted or woven wires of phosphor bronze, nickel-based alloys, nickel and copper alloy or stainless steels.
(4) A honeycomb structure as claimed in claim 1, 2 or 3 in which the honeycomb structure is easily crushable and re-openable.
(5) A honeycomb structure as claimed in claim 1, 2, 3 or 4 in which the abutting strips, or sheets are joined together at adjacent flat crests by resistance or laser spot welds.
(6) A crushable honeycomb structure as claimed in claim 4 in which a pair of abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven metal mesh are joined together at adjacent flat crests by resistance or laser spot welds to define a row of equispaced cells for receiving wires therein.
(7) A crushable honeycomb structure as claimed in claim 4 in which more than two abutting generally semi-hexagonal corrugated metal strips or sheets of knitted or woven mesh are joined together at adjacent flat crests by resistance or laser spot welds to define adjacent rows of cells for receiving a bundle of wires therein.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002370777A CA2370777A1 (en) | 2002-02-08 | 2002-02-08 | Collapsible cellular structure |
| TW092102492A TW200302782A (en) | 2002-02-08 | 2003-02-07 | Collapsible cellular structure |
| PCT/CA2003/000178 WO2003066268A1 (en) | 2002-02-08 | 2003-02-07 | Collapsible cellular structure |
| AU2003244429A AU2003244429A1 (en) | 2002-02-08 | 2003-02-07 | Collapsible cellular structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002370777A CA2370777A1 (en) | 2002-02-08 | 2002-02-08 | Collapsible cellular structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2370777A1 true CA2370777A1 (en) | 2003-08-08 |
Family
ID=27626608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002370777A Abandoned CA2370777A1 (en) | 2002-02-08 | 2002-02-08 | Collapsible cellular structure |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU2003244429A1 (en) |
| CA (1) | CA2370777A1 (en) |
| TW (1) | TW200302782A (en) |
| WO (1) | WO2003066268A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020020587A1 (en) * | 2018-07-24 | 2020-01-30 | Low & Bonar Germany Gmbh & Co. Kg | Folded core structure and process for providing a folded core structure |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB828081A (en) * | 1955-09-21 | 1960-02-17 | Glenn L Martin Co | Method of and apparatus for making seam welded cellular structure |
| GB1041435A (en) * | 1964-02-21 | 1966-09-07 | Rohr Corp | Welding system, particularly for fabricating honeycomb core |
| US3867061A (en) | 1973-12-26 | 1975-02-18 | Curtiss Wright Corp | Shroud structure for turbine rotor blades and the like |
| US4063742A (en) | 1976-08-18 | 1977-12-20 | Kentucky Metals, Inc. | Abradable fluid seal for aircraft gas turbines |
| US6485025B1 (en) * | 2000-11-27 | 2002-11-26 | Neomet Limited | Metallic cellular structure |
-
2002
- 2002-02-08 CA CA002370777A patent/CA2370777A1/en not_active Abandoned
-
2003
- 2003-02-07 WO PCT/CA2003/000178 patent/WO2003066268A1/en not_active Application Discontinuation
- 2003-02-07 TW TW092102492A patent/TW200302782A/en unknown
- 2003-02-07 AU AU2003244429A patent/AU2003244429A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| TW200302782A (en) | 2003-08-16 |
| AU2003244429A1 (en) | 2003-09-02 |
| WO2003066268A1 (en) | 2003-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |