Anti-instability test piece

Abstract

The utility model belongs to the technical field of structural strength analysis, and particularly relates to an anti-instability test piece which is composed of a beam edge strip (1), a beam supporting column (2), a stringer (4) and a beam web (3). The beam web (3) is simply supported by the four edges of the beam edge strip (1) and the beam supporting column (2), the stringer (4) is a large-scale beam web anti-instability wave isolation component, the section of the stringer (4) is in a T shape, the stringer and the beam web are in bolt connection, and the stringer greatly improves the critical instability load of the large-scale beam web structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of structural strength analysis, and particularly relates to a test piece for preventing instability. BACKGROUND

[0002] Large aircraft adopts a large-scale composite beam structure, the structure has a large width-thickness ratio, multiple stress forms are coupled, failure forms are complex, and the maturity of the analysis method is low, so a test piece needs to be designed to verify the reliability of the analysis method under compression and shear combined instability. CONTENT OF THE INVENTION

[0003] In order to solve the above problems, the application provides a test piece for preventing instability, comprising:

[0004] Two beam edge strips, the two beam edge strips are parallel to each other and have a certain distance between the two beam edge strips;

[0005] Two beam supports, the two beam supports are connected in parallel between the two beam edge strips, and the distance between the two beam edge strips is greater than the distance between the two beam supports;

[0006] A beam web, one pair of side edges of the beam web are fixed on the two beam supports, and the other pair of side edges are fixed on the two beam edge strips;

[0007] A longeron is fixed on the beam web, the longeron is parallel to the beam edge strips, the distance ratio between the longeron and the two beam edge strips is 6:4, and the longeron is made of composite material.

[0008] Preferably, the length of the longeron is equal to the distance between the two beam supports.

[0009] Preferably, the beam supports are perpendicular to the beam edge strips.

[0010] Preferably, the cross section of the longeron is T-shaped, which comprises a bottom plate and a support plate vertically connected at the center position of the bottom plate.

[0011] Preferably, the bottom plate of the longeron is connected with the beam web through a glue film, bolt connection or co-curing integral connection.

[0012] Preferably, the thickness of the bottom plate is the same as the thickness of the support plate, and the height of the longeron is half of the width of the longeron.

[0013] Preferably, the bottom plate has a plurality of through holes distributed along the length direction on both sides of the support plate, and the longeron is fastened to the beam web through the through holes and bolt fasteners;

[0014] The advantages of the present application include: the test piece greatly improves the critical instability load of the large-scale beam web structure by designing a split wave isolation component, i.e., a longeron. The T-shaped wave isolation component is mechanically connected with the beam web, avoiding the problem of "complex production process and forming die in integral forming", greatly reducing the production cost, reducing the part rejection rate, shortening the processing time, improving the production efficiency, and the parts have good interchangeability. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0016] Figure 2 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0017] Figure 3 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0018] Figure 4 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0019] Figure 5 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0020] Figure 6 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure.

[0021] Figure 7 is a preferred embodiment of the present application. The structure of the instability prevention test piece is shown in the figure. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in more detail below in combination with the drawings of the present application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0023] An instability prevention test piece, Figures 1-2 as shown, comprising:

[0024] Two beam edge strips 1, the two beam edge strips 1 are parallel to each other and have a certain distance between the two beam edge strips 1;

[0025] Two beam pillars 2, the two beam pillars 2 are connected in parallel to each other between the two beam edge strips 1, and the distance between the two beam edge strips 1 is greater than the distance between the two beam pillars 2;

[0026] A beam web 3, one pair of side edges of the beam web 3 are fixed on the two beam pillars 2, and the other pair of side edges are fixed on the two beam edge strips 1;

[0027] A longeron 4 is fixed on the beam web 3, the longeron 4 is parallel to the beam edge strip 1, and the distance ratio between the longeron 4 and the two beam edge strips 1 is 6:4; the length of the longeron 4 is equal to the distance between the two beam pillars 2

[0028] The beam pillar 2 is perpendicular to the beam edge strip 1; the cross section of the longeron 4 is T-shaped, which includes a bottom plate and a support plate vertically connected at the center of the bottom plate.

[0029] The principle is that the large-scale beam web bears compression load and shear load, and the large scale gives the structure a lower critical compression and a lower critical shear instability load. The instability wave form under the combined stress of compression stress σ and shear stress τ is shown in Figure 6 ; Figure 6 The highest point of the instability wave form is located at 40% of the height of the beam web, so the T-shaped longeron is arranged at 40% of the height of the beam web; the T-shaped longeron is a wave separation member for preventing instability, and the longeron is mechanically connected to the beam web by bolts; according to the principle that the critical instability of the longeron is later than that of the beam web, the cross-sectional parameters of the longeron are determined, wherein the thickness of the bottom plate is the same as the thickness of the support plate, the height of the longeron 4 is half the width of the longeron 4, a longeron used in a certain type of rudder structure, the thickness S2 of the bottom plate is 2.3mm, the thickness S1 of the support plate is 2.3mm; the height H of the longeron 4 is 20mm, and the width B of the longeron 4 is 40mm.

[0030] In some optional embodiments, the bottom plate of the longeron 4 is connected to the beam web 3 by a film, a bolt, or the bottom plate and the beam web 3 are integrally connected by co-curing, as shown in Figures 3-5 , compared with the co-cured longeron, the co-bonded longeron, and the bolted T-shaped wave separation longeron, the T-shaped wave separation longeron has simple composite material forming molds and production processes, and saves production costs by nearly 45%; and the bolted longeron form has good interchangeability.

[0031] In some optional embodiments, the thickness of the bottom plate is the same as the thickness of the support plate, and the height of the longeron 4 is half the width of the longeron 4.

[0032] In some alternative embodiments, the bottom plate has a plurality of lengthwise distributed through holes on both sides of the support plate, through which through holes and bolt fasteners the longerons 4 are fastened to the beam web 3.

[0033] The above description is merely that of the specific embodiments of the present application, but the scope of the protection of the present application is not limited thereto. Any changes or modifications that can be easily conceived by those skilled in the art within the technical scope of the present application should be encompassed within the scope of the present application. Therefore, the scope of the protection of the present application should be defined by the scope of the claims.

Claims

1. A buckling test article, characterized by, The utility model relates to a kind of long stringer and beam structure, including: Two beam edge strips (1), two beam edge strips (1) are parallel to each other and have a certain distance between two beam edge strips (1); Two beam supports (2), two beam supports (2) are connected in parallel between two beam edge strips (1), the distance between two beam edge strips (1) is greater than the distance between two beam supports (2); Beam web (3), a pair of side edges of beam web (3) are fixed on two beam supports (2), and the other pair of side edges are fixed on two beam edge strips (1); Long stringer (4) is fixed on beam web (3), long stringer (4) is parallel to beam edge strip (1), and the distance ratio between long stringer (4) and two beam edge strips (1) is 6:

4.

2. The test piece of claim 1, wherein The length of long stringer (4) is equal to the distance between two beam supports (2).

3. The test piece of claim 1, wherein Beam support (2) is perpendicular to beam edge strip (1).

4. The test piece of claim 1, wherein The cross section of long stringer (4) is T-shaped, which includes bottom plate and support plate vertically connected at the center of bottom plate.

5. The test piece of claim 4, wherein The bottom plate of long stringer (4) is connected with beam web (3) by adhesive film, bolt connection or bottom plate and beam web (3) are integrally connected by curing.

6. The test piece of claim 4 wherein, The thickness of bottom plate is the same as the thickness of support plate, and the height of long stringer (4) is half of the width of long stringer (4).

7. The test piece of claim 4 wherein, The bottom plate has a plurality of through holes distributed along the length direction on both sides of the support plate, and long stringer (4) is fastened on beam web (3) through the through holes and bolt fasteners.

8. The test piece of claim 4 wherein, Long stringer (4) is made of composite material.

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