JPH02158498A - Light gas-sealed structural member - Google Patents

Abstract

PURPOSE:To reduce the weight of a structural member by a method wherein each cell of porous structure is filled with gas, e.g. helium, having specific gravity lower than that of air, CONSTITUTION:A structural member is formed such that a core 3 being a honeycomb structure of an aluminum alloy material being a raw material is adhered in a laminar state to upper and lower outer plates 1 and 1, formed by a sheet of an aluminum alloy with a thickness of approximate 1mm, therebetween through adhesives 2 formed by a resin film of epoxy being a raw material. In manufacture of the structural member, by adhering together in a laminated state the outer plate 1, the adhesive 2, and the core 3 in a large control chamber or a bag sealed with helium gas, a product is finished as a structural member in which each cell of the core 3 is sealed with helium gas.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light gas encapsulating structural member,
It is used in fields where lightness is required, such as in aircraft.

[Conventional technology]

Traditionally, structural members used in fields that require light weight, such as aircraft, have a honeycomb structure or a corrugated cardboard-shaped structure with corrugated plates sandwiched between flat plates, and each chamber of the multi-chamber structure is filled with air. It was something that had been done.

[Problem that the invention seeks to solve]

The present invention solves the problem that conventional honeycomb structure or corrugated cardboard-shaped multi-chamber structural members have a limit because if the thickness of the structural member is made thinner or the voids are made larger in order to make it lighter, the strength decreases. There was a point. The present invention aims to solve the above-mentioned problems and to obtain a structural member that is lighter than conventional structural members.

[Means for solving problems]

In order to solve the above-mentioned problems and achieve the object of the present invention, the light gas-filled structure member according to the present invention is characterized in that a gas having a specific gravity lower than that of air is sealed in each chamber of a multi-chamber structure. shall be.

Here, gases with a specific gravity lighter than air include helium (4), hydrogen (2), since the average molecular weight of air is 28.8.
and nitrogen (28). If this is sealed under reduced pressure, the specific gravity can be further reduced.

However, the most effective and safest of these is helium. The gas with a specific gravity lower than air sealed in this structural material may be at the same pressure as the atmosphere, or may be sealed at a reduced pressure to match the outside air since aircraft usually fly at high altitudes.

Other examples of multi-lumen structures include honeycomb structures and cardboard-shaped structures.

To enclose a light gas in each small pore of a structural member, thin plates or film sheets are attached to the ends of the honeycomb structure by gluing or welding in an environment such as atmospheric pressure or reduced pressure of helium gas. Alternatively, after gluing or welding the thin plates or film sheets in air, make a small hole through the outer shell in each cavity and let the air inside through the hole. Alternatively, a gas such as helium gas which has been removed and has a reduced pressure may be sealed. Adhesives include epoxy resin adhesives, resin films made of nylon and epoxy, or neoprene adhesives that maintain airtightness even under low or high temperatures and high pressure, have good peel strength, and are lightweight. It is effective to use

In addition, the outer panels and side panels attached to the ends of the honeycomb structure or corrugated structure are made of materials such as aluminum, titanium alloy, polyvinyl fluoride, nylon, or polyvinyl chloride, which are lightweight and do not easily allow the enclosed gas to pass through. , FR reinforced with glass fiber, PAN fiber, carbon fiber, etc.
It is effective to use a P plate (fiber-reinforced plastics) or the like, and the honeycomb core material and corrugated plate are preferably made of the same material as the outer panel and side panels, or a material that has good adhesion to these.

[Function] Conventionally, structural members that are required to be lightweight are made of a honeycomb material made of hexagonal honeycombs, a corrugated cardboard material made of corrugated plates sandwiched between flat plates, etc., and the voids thereof are filled with air.

In order to achieve the required strength of a structural material, the structural material must have a constant weight as long as the structural material is the same. By filling the void with a gas such as helium, which has a lower specific gravity than air, it is possible to further reduce the weight due to the difference in specific gravity of the rigid gas.

The gas with a specific gravity lower than air sealed in this structural material may be at the same pressure as the atmosphere, or may be sealed at a reduced pressure to match the outside air since aircraft usually fly at high altitudes.

In order to seal this gas, which has a lower specific gravity than air, into the structural material, it is sufficient to use an adhesive with good airtightness when bonding the outer panel to the core material, but many voids in honeycomb structures and corrugated cardboard structures are adjacent to each other. Since the sealed gas exists in the air, it is difficult for the sealed gas to escape to the outside (and when the gas inside is sealed after being reduced in pressure, it is difficult for air to enter from the outside.The structure of this invention is used for structural materials of aircraft, etc.) In such a case, even if a part of the structure is damaged, there are many voids in the honeycomb structure or cardboard shape that are sealed independently, so it is not possible to damage a part of the structure. However, there is no risk of the sealed gas leaking out to other parts, so safety will not be compromised.

[Example] FIG. 1 is an explanatory diagram showing an example of a honeycomb structure of the light gas enclosure structure member of the present invention. Here, l indicates the outer panel, 2 indicates the adhesive, and 3 indicates the core material. This light gas-filled structural member is an example in which a thin plate or film sheet is attached to the end of a honeycomb structure by adhesive, and helium gas is sealed inside the thin plate or film sheet.

In this embodiment, the outer panel 1 is a thin plate of aluminum alloy with a thickness of 1 mm, the core material 3 is a honeycomb structure made of aluminum alloy, and the adhesive 2 is a resin film made of nylon and epoxy.

The outer panel 1, the adhesive 2, and the core material 3 are stacked and bonded together as shown in FIG. 1 in a large operating chamber or bag filled with helium gas to form an integral structure that is bonded to each other.

FIG. 2 is an explanatory view showing an example of a corrugated structure of the light gas enclosure structure member of the present invention. Here, ■ indicates an outer panel, 2 indicates a corrugated panel, and 3 indicates a side panel. This light gas-filled structural member is an example in which a side plate is attached by welding to the end of a corrugated structure in which a corrugated plate is sandwiched between flat outer plates, and helium gas is sealed inside the side plate.

In this embodiment, the outer panel 1 is a thin plate of 1 mm thick nylon/glass cloth laminate, the corrugated panel 2 is a corrugated structure made of nylon that melts at a low temperature, and the side panels 3
is a thin plate made of nylon with a thickness of 0.3 mm.

The outer panel 1, the corrugated panel 2, and the side panel 3 are stacked in helium gas as shown in FIG. 2, and the outer panel 1 and the side panel 3 are welded to each other to form an integral structure.

〔Effect of the invention〕

According to this invention, by filling the voids of a honeycomb structure or a corrugated board with a gas such as helium, which has a lower specific gravity than air, it is possible to further reduce the weight of the structural material by the difference in specific gravity between the air and the enclosed gas. .

Furthermore, according to the present invention, even if a part of the structure is damaged, many voids in the honeycomb structure or the corrugated cardboard shape remain independently sealed, so that the structure can be damaged. Even if one part is damaged, the sealed gas in other parts will not leak outside, and safety will not be compromised.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing one embodiment of a honeycomb structure of a member for light gas enclosure structure of the present invention. FIG. 2 is an explanatory view showing an example of a corrugated structure of the light gas enclosure structure member of the present invention. ■=Outer panel, 2: Adhesive, 3: Core material, 4: Outer panel, 5: Corrugated panel, 6: Side panel. Figure 1

Claims (2)

[Claims] (1) A member for a light gas-filled structure, characterized in that a gas having a specific gravity lighter than air is sealed in each chamber of a multi-chamber structure. (2) The light gas-filled structural member according to claim 1, wherein the gas having a specific gravity lower than air is helium.