# US 2018/0304579 A1 · Damping skin system for protecting composite parts

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- Number: US 2018/0304579 A1
- Document ID: US20180304579A1
- Status: Published application
- Kind: A1
- Application number: 16/016,892
- Filed: 2018-06-25
- Published: 2018-10-25
- Earliest claimed: 2010-10-21
- Assignees: SKF Aerospace France S.A.S
- Applicants: Skf Aerospace France
- Inventors: Jean-Luc BRIAN; Valia FASCIO; Philippe VIE; Guy VALEMBOIS
- Web page: https://patentgrep.com/patent/US20180304579A1

## CPC

- B32B 5/26: another layer {next to it} also being fibrous or filamentary {(relative arrangement of fibres or filaments of different layers B32B5/12)}
- B32B 27/34: comprising polyamides
- B32B 3/08: characterised by added members at particular parts {(layer formed of separate pieces of material which are juxtaposed side-by-side B32B3/14, B32B3/18)}
- B32B 3/20: of hollow pieces, e.g. tubes; of pieces with channels or cavities
- B32B 5/02: 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)}
- B32B 5/16: characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)}
- B32B 5/22: characterised by the presence of two or more layers which {are next to each other and are fibrous, filamentary, formed of particles or foamed (layer formed of natural mineral fibres or particles next to a foam layer B32B19/047, next to a layer made of particles B32B19/048, or next to a fibrous or filamentary layer B32B19/06; paper layer or cardboard layer next to a paper layer or cardboard layer B32B29/005, next to a foam layer B32B29/007, next to a fibrous or filamentary layer B32B29/02, or next to a particulate layer B32B29/04)}
- B32B 5/30: one layer {being formed of particles, e.g. chips,} granules, powder
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- F41H 5/04: composed of more than one layer {(outerwear resistant to mechanical aggressions A41D31/24; layered products B32B; shaping reinforced articles B29C67/00)}
- F41H 5/0471: {Layered armour containing fibre- or fabric-reinforced layers (in combination with ceramic layers F41H5/0428, with metal layers F41H5/0457)}
- F41H 5/0492: {Layered armour containing hard elements, e.g. plates, spheres, rods, separated from each other, the elements being connected to a further flexible layer or being embedded in a plastics or an elastomer matrix}
- B32B 2250/02: 2 layers
- B32B 2250/03: 3 layers
- B32B 2260/025: Particulate layer
- B32B 2260/046: Synthetic resin
- B32B 2262/0269: Aromatic polyamide fibres
- B32B 2264/02: Synthetic macromolecular particles
- B32B 2264/10: Inorganic particles
- B32B 2264/105: Metal
- B32B 2307/202: Conductive
- B32B 2307/306: Resistant to heat
- B32B 2307/50: having particular mechanical properties
- B32B 2307/546: Flexural strength; Flexion stiffness
- B32B 2307/558: Impact strength, toughness
- B32B 2307/56: Damping, energy absorption
- B32B 2307/5825: Tear resistant
- B32B 2307/708: Isotropic
- B32B 2307/718: Weight, e.g. weight per square meter
- B32B 2307/732: Dimensional properties
- B32B 2571/00: Protective equipment
- B32B 2605/18: Aircraft
- B64D 7/00: Arrangement of military equipment, e.g. armaments, armament accessories or military shielding, in aircraft; Adaptations of armament mountings for aircraft (dropping bombs or the like B64D1/00)
- Y10T 428/24496: Foamed or cellular component
- Y10T 428/249971: Preformed hollow element-containing
- Y10T 428/249973: Mineral element
- Y10T 428/249974: Metal- or silicon-containing element
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F41H: ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Damping skin for protecting composite parts includes a composite material having at least two superposed layers, namely a first layer formed from the juxtaposition of hollow spheres, which is intended to be applied and fixed, either directly or indirectly, to the surface of the part to be protected and a second layer covering the first and formed from a wall made of a material having plastic deformation properties.

## Claims

### Claim 1

A damping skin system for protecting composite parts, said damping skin system comprising:
a substrate comprised of a first composite material and having a surface, said first composite material being comprised of a first structural component and a first resin;
a skin comprised of a second composite material and a wall layer, said second composite material being comprised of a second structural component and a second resin,
wherein said second composite material is a first layer and said wall layer is a second layer, said first layer and said second layer being superposed, said second layer covering said first layer,
wherein said second structural component is comprised of a juxtaposition of hollow spheres applied and fixed to said surface, and
wherein said second layer is comprised of a moldable and resilient material, said first composite material having more mechanical resistance than said first layer.

### Claim 2 (depends on 1)

The damping skin system according to claim 1, wherein said second structural component of said first layer comprises superposition of several layers, each layer being comprised of juxtaposition of hollow spheres, each layer of hollow spheres being separable from other layers of hollow spheres by an intermediate wall.

### Claim 3 (depends on 1)

The damping skin system according to claim 1, said skin further comprising:
a third layer affixed to said first layer on one side and affixed to said surface of said substrate on an opposite side, said third layer having a means for removable attachment in contact with said surface of said substrate.

### Claim 4 (depends on 1)

The damping skin system according to claim 1, wherein said hollow spheres are comprised of a material selected from a group consisting of metal, synthetic materials, minerals, or a combination thereof.

### Claim 5 (depends on 1)

The damping skin system according to claim 1, wherein said hollow spheres have different diameters, each layer of hollow spheres having spheres with diameters independent from other layers.

### Claim 6 (depends on 1)

The damping skin system according to claim 1, wherein said wall layer is comprised of at least one sheet of a composite tissue.

### Claim 7 (depends on 6)

The damping skin system according to claim 6, wherein said composite tissue is comprised of an aramid polymer.

### Claim 8 (depends on 6)

The damping skin system according to claim 6, wherein said composite tissue has components having properties selected from a group consisting of insulating ability, conductivity or both.

### Claim 9 (depends on 1)

The damping skin system according to claim 1, wherein said hollow spheres are assembled by gluing to at least one of a group consisting of: each other, said wall layer, and said surface of said substrate.

### Claim 10 (depends on 9)

The damping skin system according to claim 9, wherein said hollow spheres are assembled by a said second resin applied at points of contact of said hollow spheres.

### Claim 11 (depends on 1)

The damping skin system according to claim 1, said skin further comprising:
a compressible material filling in space remaining between said hollow spheres of said second composite material, said compressible material having a compression resistance lower than a compression resistance of said hollow spheres.

### Claim 12 (depends on 1)

The damping skin system according to claim 1, wherein said second composite material of said skin has thickness, corresponding to said first composite material of said substrate.