RU2507113C1 - Honeycomb - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to honeycomb sandwiches. Sandwich panel honeycomb is composed by 3D structure of composite regular hollow hexagon prisms having common face with every adjacent face. Sandwich panel honeycomb is composed by of composite regular hollow triangular or tetrahedral or hexagon prisms with walls reinforced by unidirectional fibres and composed by crossed bards. In compliance with second version, sandwich panel honeycomb is composed by 3D structure of composite regular hollow hexagon prisms having common face with every adjacent face. Walls of hexagon prisms are made of bars each directed at preset angle to its base, with one bar crossing horizontally the prism face centre.

EFFECT: decreased weight, better performances, longer life.

3 cl, 12 dwg

Description

The invention relates to the field of building honeycomb structures and can be used in the manufacture of multilayer panels of composite materials that work on stability under the action of external pressure and compressive force, used in aircraft, shipbuilding, engineering, construction and other industries.

The effectiveness of three-layer structures for various types of loading is largely determined by the geometric and mechanical characteristics of the aggregate used, and the search for new aggregate structures is natural.

Known "Multilayer panel", including sheathing, honeycomb core formed by interconnected corrugated strips, and additional layers of filler in the form of a zigzag corrugation, located between the skin and honeycomb core, forming branch channels (RF patent No. 2085671, publ. 27.07. 1997, IPC Е04С 2/32, В32В 3/12, В32В 3/28)

The disadvantage of this panel is the large mass of the structure due to the fact that the cell walls are solid, and the difficulty in manufacturing.

The closest in technical essence taken as a prototype is the invention “Sandwich panel with honeycomb core”, containing two surface layers made of sheet material and placed between them an internal filler made in the form of a honeycomb structure with cells in the form of regular hollow prisms with a hexagonal base, muffled on one side and having one common face with each adjacent one (patent No. 2382854, IPC Е04С 2/00, publ. 02.27.2010).

A disadvantage of the known invention is that the structural features of the cells do not allow moisture to condense in the cells to be removed, which leads to the destruction of the aggregate, that is, leads to a decrease in strength, stiffness and an increase in mass (due to moisture), and a decrease in operational characteristics.

The task of the invention is to reduce the mass of the structure and increase operational characteristics.

The technical result from the use of the present invention is to reduce the mass and increase operational characteristics, leading to an increase in the service life of the aggregate.

The technical result is achieved by the fact that in the honeycomb core, which is a three-dimensional structure of composite material in the form of cells in the form of regular hollow hexagonal prisms having a common face with each of the neighboring prism, cells are introduced in the form of regular hollow four- or trihedral prisms, the walls of which are reinforced unidirectional fibers and made in the form of intersecting rods with the possibility of maximum rigidity and minimum weight with a given ratio of side faces to the faces of the base.

Cellular filler is a three-dimensional structure of composite material in the form of cells in the form of regular hollow hexagonal prisms having a common facet with each of the adjacent ones, the walls of the hexagonal cells are made of rods, each of which is directed at a given angle to its base and one rod extending horizontally in the center of the cell.

To increase the rigidity of the structure, an additional nth number of rods directed horizontally relative to its base and an nth number of rods directed vertically through an intersection horizontally and vertically directed at a given angle were introduced.

The use of a filler made in the form of a honeycomb structure in the form of regular hollow prisms with a hexagonal, tetrahedral and trihedral base with faces in the form of intersecting rods increases the operational characteristics of the filler, reduces the weight of the structure without changing the strength characteristics.

The analysis of the prior art cited by the applicant made it possible to establish that there are no analogs characterized by sets of features identical to all the features of the claimed technical solution. Therefore, the claimed technical solution meets the condition of patentability "novelty."

The search results for known solutions in the art in order to identify features that match the distinctive features of the prototype of the features of the claimed technical solution have shown that they do not follow explicitly from the prior art. From the prior art determined by the applicant, the influence of the transformations provided for by the essential features of the claimed technical solution on the achievement of the specified technical result is not known.

Therefore, the claimed technical solution meets one of the criteria for the conditions of patentability: "inventive step

The essence and feature of the invention are shown in the drawings, which depict:

figure 1 - honeycomb in the form of a hexagon, the faces are presented in the form of intersecting rods;

figure 2 - honeycomb in the form of a tetrahedron, the faces are presented in the form of intersecting rods;

figure 3 - honeycomb in the form of a trihedron, the faces are presented in the form of intersecting rods;

figure 4 - cell honeycomb core, the rods of which are located at a certain angle to the base, having one horizontal rod;

figure 5 - honeycomb in the form of a hexagon, the rods of which are located at a certain angle to its base.

in Fig.6, 7 - explaining design schemes, where: 1 - intersecting rods of the filler; 2 - cell walls in the form of intersecting rods; 3 - hexagon cell;

4 - tetrahedral cell;

5 - trihedral cell;

6 - horizontal rods;

7 - vertical rods;

8 - cell wall with one horizontal rod;

9 - a rod located at an angle α to the base.

Honeycomb core construction

The canvas, consisting of a composite material, is reinforced by applying fibers unidirectionally horizontally and at a given angle (≈55 °) to the base, then cut into dimensional flat tapes, the width of which is equal to the width of the honeycomb core cell edge, then make holes between the reinforced fibers, forming intersecting rods 1 (Figs. 1, 2, 3), the ribbons bend, forming corrugations in the form of parts of hexagonal 3, or tetrahedral 4, or trihedral 5 cells, then they are impregnated with a hardening product, then the connection of profiled segments of each the other is carried out so that the vertices of the corrugations of the profiled tapes are located opposite the vertices of the corrugations (troughs) of the adjacent profiled tapes, while the intersecting rods of profiled tapes obtained from one sheet coincide with the intersecting rods of another profiled tape of the same sheet (corrugation), in this case cells given shape (six-, four- or trihedra) (Figs. 1, 2, 3).

. Числовой параметр ∫σ_эквdV/M не меняется и не является отличительным параметром в данном примере, а Р_max/М имеет максимальное значение при α≈55° и таким параметром может быть, следовательно, оптимальное отношение сторон стержневого заполнителя, при котором заполнитель обеспечивает максимальную прочность при минимальном весе а/b≈1.4282(Фиг.7).The optimal angle of inclination of the rod relative to its base is obtained as follows: suppose that in the bar structure shown in (Fig. 6), the stresses in the rods are σ ₆ = σ ₉ = σ _c . Then the area ratio is determined from the equilibrium equation in the projection onto the x axis: σ _B F ₆ cos (α) -σ _B F ₉ = 0 or F ₆ = F; F ₉ = Fcos (α). From the equilibrium equation in the projection onto the y axis, P = σ _in Fsin (α) follows. The bearing capacity to mass ratio is determined by the ratio $$P_{\max }/M=\frac{{\sigma }_B}{\rho }\frac{\mathrm{one}}{H}\frac{0.5\sin (2\alpha )}{\mathrm{one}+{\cos }^2\left(\alpha \right)}$$

. The numerical parameter ∫σ _equiv dV / M does not change and is not a distinctive parameter in this example, and P _max / M has a maximum value at α≈55 ° and this parameter can therefore be the optimal aspect ratio of the core filler, at which the filler provides maximum strength with minimum weight a / b≈1.4282 (Fig.7).

Thus, filler with faces in the form of rods, made in the form of a honeycomb structure with cells in the form of regular hollow prisms with a hexagonal, quadrangular and triangular base, having one common face with each of the adjacent, allows to increase the longitudinal and transverse rigidity of the structure while reducing it mass per unit length with an optimal arrangement of reinforced fibers having an angle of inclination to its base α≈55 °.

Compared with the known analogues, the inventive honeycomb core, made in the form of cells of six-, four- and trihedrons, allows to reduce the weight of the aggregate and increase its operational characteristics due to the fact that moisture will not accumulate in the cells, as a result, the service life will generally increase placeholder.

Claims (3)

1. Cellular filler of a multilayer panel, which is a three-dimensional structure of a composite material in the form of cells in the form of regular hollow hexagonal prisms, having a common face with each of the neighboring, characterized in that the cells are introduced in the form of regular hollow four- or trihedral prisms, as well as hollow hexagonal prisms, the walls of which are reinforced with unidirectional fibers and made in the form of intersecting rods with the possibility of maximum rigidity and minimum weight with a given ratio of side faces to the edges of the base. 2. Cellular filler of a multilayer panel, which is a three-dimensional structure of a composite material in the form of cells in the form of regular hollow hexagonal prisms having a common face with each of the neighboring, characterized in that the walls of the hexagonal cells are made of rods, each of which is directed at a given angle to its base and one rod extending horizontally in the center of the cell face. 3. The honeycomb core of the multilayer panel according to claim 2, characterized in that to increase the rigidity of the structure, an additional nth number of rods directed horizontally relative to its base and an nth number of rods directed vertically through an intersection of horizontally and vertically directed at a given angle.

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