RU202911U1 - Pleated core of sandwich panel - Google Patents

Abstract

The utility model relates to lightweight aggregates of sandwich panels used in vehicles, spacecraft and construction. The folded filler of the multilayer panel (Fig. 1, a) is made of sheet material. It has a structure that unfolds onto a plane. Its structure consists of periodically repeating typical fragments. A typical fragment of a folded filler has two sections (Fig. 1, c). Each of the sections includes a linear corrugation made up of faces 1, 2, 3 for the first section and 4, 5, 6 for the second section. In addition, each section contains triangular faces 7, 8, 9, 10 adjacent to the ends of linear corrugations, as well as rectangular edges 11, 12 adjacent to the corrugation of the second section. Between the sections in the form of linear corrugations with adjacent triangular edges, as well as from the free end of the first section, there is one or more rows of modified zigzag corrugation formed by parallelograms 13, 15, 16, 18 and rectangular 14, 17 edges (Fig. 1, c). The technical result is achieved by introducing edges located at a large angle to the sheathing plane and forming the structure of a modified zigzag corrugation, which increases the strength of the panel when operating in transverse compression. 2 ill.

Description

The utility model relates to lightweight aggregates of sandwich panels used in vehicles, spacecraft and construction.

Known folded filler, periodically repeating typical fragment of which contains two sections of linear corrugation located at different levels and connected by faces in the form of parallelograms (Khaliulin V.I., Razdaibedin A.A., Menyashkin D.V. sandwich panels with a V-corrugated structure. Izvestiya VUZA Aviation Technique, No. 1, 2006, pp. 52-58. - 7 p.).

The disadvantage of the filler is its low strength and rigidity due to the fact that it does not have edges in contact with two skins at the same time, and the force is transferred from the skin to the skin through broken lamellar structures.

Known folded filler with a zigzag corrugation structure, a typical fragment of which consists of parallelogram-shaped faces connected in pairs (Patent 71144 Russian Federation, IPC F02C 7/045. Noise muffler [Text] / Shakhmatov EV, Kryuchkov AN , Bogdanov S.A., Seyfetdinov R.B., Belov G.O .; applicant and patentee State educational institution of higher professional education Samara State Aerospace University named after academician SP. Korolev (RU). - No. 2007123970/22; application. 25.06 .2007; publ. 02.27.2008).

This type of filler does not provide high strength of the connection with the skin due to the small area of its contact with the skin, which is determined only by the length of the ribs along zigzag lines.

Known folded filler, a typical periodically repeating fragment of which is composed of four parallel faces, between which are two rectangular faces (V.N. Paimushin, Theoretical and experimental determination of the averaged elastic and strength characteristics of a folded filler in the form of an M-corrugation, Uchen. Zap. Kazan, Fiz.-Matem. Nauki Ser., 2014, volume 156, book 4, 60-86.).

This type of filler is characterized by a low bond strength with the skins due to the small contact area between them.

Known folded structure, which is an alternation of sections in the form of a linear corrugation and a zigzag corrugation associated with it (copyright certificate SU 1435727 E04C 5/03, publ. 07.11.88. Bull. No. 41).

The disadvantage of such a folded structure is that its envelope surface is stepped and cannot serve as a basis for a multilayer panel.

Known folded aggregate of a multilayer panel, made of sheet material (ZhiJin Wang. HuaZhi Zhou. VI Khaliulin. AV Shabalov. Six-ray folded configurations as the geometric basis of thin-walled elements in engineering structures. Thin-Walled Structures, 2018-09, 130: 435-448.).

The structure of its periodically repeating typical fragment has two sections in the form of a linear corrugation, consisting of faces in the form of isosceles trapezoids and rectangular faces. The faces in the form of triangles with their larger side are attached to the ends of both linear corrugations.

This filler is closest to the claimed utility model and is taken as a prototype.

The disadvantage of this structure is the low strength of the panel when it is loaded with a transverse load.

The problem is the low efficiency of the work of folded aggregates when loading the panel with a transverse load when used in vehicles, spacecraft and construction.

The technical result to be achieved by the claimed utility model consists in increasing the strength of a multilayer panel when loaded with a transverse load.

The technical result is achieved by the fact that in a folded core of a multilayer panel made of sheet material, a periodically repeating typical fragment of which has two sections, each of which is presented in the form of a linear corrugation, consisting of faces in the form of isosceles trapezoids and a rectangular face adjacent to the large sides isosceles trapeziums - for the first section and to the smaller sides of isosceles trapezoids - for the second section, which also contains rectangular faces adjacent to a rectangle of a linear corrugation, in addition, each section contains identical triangular faces attached to all ends of a linear corrugation with its large sides , new is that between the inner sides of the first and second sections and from the outer end of one of the sections there is one or more rows of modified zigzag corrugation, which in general constitutes a single typical fragment of the folded filler.

The essence of the utility model is shown in Fig. 1 and FIG. 2, where

fig. 1, a - folded filler in a relief state;

fig. 1, b - scan of the folded filler;

fig. 1, c - a typical fragment of a folded filler;

1, 2, 3 - faces in the form of isosceles trapezoids and a rectangular face between them, forming a linear corrugation of the first section of a typical fragment of the filler;

4, 5, 6 - faces in the form of isosceles trapezoids and a rectangular edge between them, forming a linear corrugation of the second section of a typical fragment of the filler;

7, 8, 9, 10 - triangular faces adjacent to the ends of linear corrugations, respectively;

11, 12 - rectangular edges adjacent to the linear corrugation of the second section;

13, 14, 15 - parallelogram and rectangular faces forming the structure of a modified zigzag corrugation adjacent to the first section;

16, 17, 18 - parallelogram and rectangular edges forming the structure of a modified zigzag corrugation located between the first and second portion of linear corrugations;

fig. 2 - the stages of transformation of the folded filler from the reamer (Fig. 2, a) through intermediate transformation options (Fig. 2, b, c) to the assembled block (Fig. 2, d).

The folded filler of the multilayer panel (Fig. 1, a) is made of sheet material. It has a structure that unfolds onto a plane. It is obtained by folding from a sheet along the marking lines (Fig. 1, b). Its structure consists of periodically repeating typical fragments (a typical fragment is highlighted in Fig. 1b).

A typical fragment has two sections (Fig. 1, c). Each of the sections includes a linear corrugation made up of faces 1, 2, 3 for the first section and 4, 5, 6 for the second section. In addition, each section contains triangular faces 7, 8, 9, 10 adjacent to the ends of linear corrugations, as well as rectangular edges 11,12 adjacent to the corrugation of the second section.

One or more rows of a modified zigzag corrugation formed by parallelograms 13, 15, 16, 18 and rectangular faces 14, 17 (Fig. 1, c) are located between the inner sides of the first and second sections and from the outer end of one of the sections.

The filler contains a large number of faces 13, 14, 15 and 16, 17, 18, forming a modified zigzag corrugation. These edges are located at a steep angle to the plane of the skins and increase the strength of the panel when working in transverse compression.

The offered folded filler can be made from thin hard-sheet blanks, including paper (NOMEX type), cardboard, aluminum, steel, etc., as well as from composites based on glass, carbon, basalt and other fibers.

Achievement of the technical result is determined by the introduction of edges located at a large angle to the plane of the skin and forming the structure of a modified zigzag corrugation, which increases the strength of the panel when working in transverse compression.

Thus, the claimed core of a sandwich panel is characterized by high efficiency when the panel works in compression.

Claims (1)

A folded core of a multilayer panel, made of sheet material, a periodically repeating typical fragment of which has two sections, each of which is presented in the form of a linear corrugation, consisting of faces in the form of isosceles trapeziums and a rectangular face adjacent to the large sides of isosceles trapeziums - for the first section and to the smaller sides of the isosceles trapezoid - for the second section, which also contains rectangular faces adjacent to the rectangle of the linear corrugation, in addition, each section contains the same triangular edges attached at all ends of the linear corrugation with its large sides, characterized in that between the inner sides of the first and the second section and from the outer end of one of the sections there is at least one row of modified zigzag corrugation, which as a whole constitutes a single typical fragment of the folded filler.

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