CN218317398U

CN218317398U - VARI process composite material small-box-section-level test piece

Info

Publication number: CN218317398U
Application number: CN202222674365.5U
Authority: CN
Inventors: 韩易东; 郭祥; 王丽平; 冯变变
Original assignee: AVIC First Aircraft Institute
Current assignee: AVIC First Aircraft Institute
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-01-17
Anticipated expiration: 2032-10-11

Abstract

The application belongs to the field of static tests and impact damage end-touch tests of box sections of multi-ribbed rudder surfaces of airplanes, and particularly relates to a VARI process composite material small box section-level test piece, which comprises an upper skin, a lower skin and a ribbed plate arranged between the upper skin and the lower skin, wherein the ribbed plate is trapezoidal, so that a slope surface is formed between the upper skin and the lower skin; the lower bottom of the rib plate is provided with a C-shaped beam, the C-shaped beam is provided with an upper profile, a lower profile and a web plate for connecting the upper profile and the lower profile, and the upper profile is connected with the inner side surface of the upper skin; the profile is connected with the medial surface of covering down, and this application can simplify structural style, reduce manufacturing cost, shorten production cycle and the test result is more convincing under the condition of guaranteeing that boundary condition is close.

Description

VARI process composite material small box section-level test piece

Technical Field

The application belongs to the field of static tests and impact damage end-touching tests of box sections of airplane ribbed rudder surfaces, and particularly relates to a VARI (vacuum ignition resistance) process composite material small-box-section-level test piece.

Background

According to retrieval, the design of a flat plate or a flat plate reinforcement test piece is generally adopted in the design of static test and impact damage probing test pieces in China, the design of the flat plate test piece is mainly used for the mechanical property test of a concrete composite laminated plate wallboard or sandwich wallboard, the flat plate reinforcement test piece is generally used for simulating the mechanical property test of skin lengthening trusses, the skin support of the upper surface and the skin support of the lower surface of a multi-ribbed box section structure are different due to different rib section shapes, and the flat plate reinforcement test piece cannot simulate the mechanical property test of the multi-ribbed box section. And the design of the small box section level test piece can be used for testing the mechanical property of the integral piece with the ribs with different section shapes on the wall plate, so that the box section stress condition of the ribbed control surface structure can be simulated more truly.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present application provides a VARI process composite small block level test piece, comprising:

the rib plate is trapezoidal, so that a slope is formed between the upper skin and the lower skin; the lower bottom of the rib plate is provided with a C-shaped beam, the C-shaped beam is provided with an upper profile, a lower profile and a web plate for connecting the upper profile and the lower profile, and the upper profile is connected with the inner side surface of the upper skin; the lower molded surface is connected with the inner side surface of the lower skin.

Preferably, the upper skin is divided into a plurality of rectangular areas with different thicknesses along the lower bottom of the rib plate towards the upper bottom.

Preferably, the plurality of rectangular regions having different thicknesses are gradually reduced in thickness in a direction along a lower bottom of the rib toward an upper bottom.

Preferably, the rib plate is a J-shaped rib plate, a first bend along one side direction of the rib plate is arranged at the joint of the rib plate and the lower skin, and the first bend is fixedly connected with the lower skin through a fastener; the joint of the ribbed plate and the upper skin is provided with a second bending and a third bending along the directions of two sides of the ribbed plate, and the second bending and the third bending are fixedly connected with the upper skin through fasteners.

Preferably, the rib plate is fixedly connected with the C-shaped beam through an L-shaped corner piece.

Preferably, the ribs have three equally spaced ribs.

Preferably, the lower skin has a flange at the upper bottom of the rib plate, and the flange overlaps the upper skin and is connected by a fastener.

Preferably, the VARI process composite small box grade test piece is a mixed paving or fabric of type I type 2 CF3031 grade/YMS 3109 and type I type 2U 3160 grade/YMS 3109, and the composite material laminated plate is formed by the test piece.

The advantages of the present application include: the test piece can truly restore the structural form of the box section of the multi-ribbed rudder surface, and the structural form of the test piece between a flat plate-level test piece and a box section-level test piece is designed. When the true ribbed control surface structure of simulation suffers impact damage, dull and stereotyped reinforcement test piece can't effectively simulate ribbed structure boundary support condition, and box section level test piece is unanimous completely, true reliable with actual structure, but the structure is complicated, with high costs, consequently the utility model provides a simple structure, with low costs, manufacturing cycle weak point and with the similar test piece structural design of true structure.

Drawings

FIG. 1 is a schematic illustration of a small block level test piece according to a preferred embodiment of the present application;

FIG. 2 is a schematic view of an upper skin of a preferred embodiment of the present application;

FIG. 3 is a side view of a preferred embodiment of the present application of a small block grade test piece.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.

The control surface structure of the real VARI ribbed laminate has the characteristics of wing shape, complex structure, high manufacturing cost and the like, and is not beneficial to the design and manufacturing production of test pieces, so that the structure of the box section of the VARI ribbed laminate is simplified. The box section wall plate with the wing profile is simplified into a flat plate, the section of the box section is simplified into a uniform section, the boundary of a transition area between different thicknesses on the wall plate is designed to be parallel to the edge of the wall plate, and only two rib distances are reserved. The simplified box section test piece is close to a real structural form to the maximum extent, the boundary support is accurate, and the production and manufacturing period is greatly shortened.

The structure of the test piece is shown in fig. 1 and fig. 3, an upper skin 1, a lower skin 2 and a ribbed plate 6 arranged between the upper skin 1 and the lower skin 2, wherein the ribbed plate 6 is trapezoidal, so that a slope is formed between the upper skin 1 and the lower skin 2; the lower bottom of the rib plate 6 is provided with a C-shaped beam 3, the C-shaped beam 3 is provided with an upper profile, a lower profile and a web plate for connecting the upper profile and the lower profile, and the upper profile is connected with the inner side surface of the upper skin 1; the lower profile is connected with the inner side of the lower skin 2.

In some alternative embodiments, the upper skin 1 is divided into a plurality of rectangular areas of different thicknesses along the lower bottom of the rib 6 toward the upper bottom.

In some optional embodiments, the plurality of rectangular areas with different thicknesses gradually decrease in thickness along the direction from the bottom to the top of the rib plate 6, the upper skin and the J-shaped rib are integrally formed by a VARI process, the rib pitch is 242mm, the structural form is as shown in fig. 2, marked a, b and c in the figure respectively represent three areas with different thicknesses of 3.28mm, 2.502mm and 1.575mm, and the front end and the rear end of the J-shaped rib are respectively connected by 4 fasteners in a reinforcing manner.

In some alternative embodiments, the rib 6 is a J-shaped rib, the rib 6 has a first bend in the direction of one side of the rib 6 at the connection with the lower skin 2, the first bend is fixedly connected with the lower skin 2 by a fastener; the joint of the ribbed plate 6 and the upper skin 1 is provided with a second bend and a third bend along the directions of two sides of the ribbed plate 6, and the second bend and the third bend are fixedly connected with the upper skin 1 through fasteners.

In some alternative embodiments, the rib plate 6 is fixedly connected with the C-shaped beam 3 through an L-shaped corner piece.

In some alternative embodiments, the ribs 6 have three equally spaced apart ribs.

In some alternative embodiments, the lower skin 2, the C-beam 3 and the L-fillet 4 are all formed by a VARI process liquid, and the lower skin is turned up at the trailing edge to overlap the upper skin and is connected by fasteners.

In some alternative embodiments, the VARI process composite small-section test piece is made of a mixed-lay type I type 2 CF3031 grade/YMS 3109 and type I type 2U 3160 grade/YMS 3109 or a composite laminate using a single fabric.

The small box section test piece is designed to provide a test piece design platform for a VARI process dense rib structure, and can be used for different tests, such as box section static test, impact damage end-touching test, damage repair test and the like.

The specific method comprises the following steps: according to different thickness areas on the wallboard, adopting different levels of impact energy to carry out BVID impact damage probing test, and probing energy values of different thickness BVIDs of the composite material laminate of the VARI process; or adopting different repair methods in the same thickness area to verify which repair method is more suitable for repairing the damage of the VARI technical product, and the like.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A VARI process composite small-section-level test piece, comprising:

the composite structural component comprises an upper skin (1), a lower skin (2) and a ribbed plate (6) arranged between the upper skin (1) and the lower skin (2), wherein the ribbed plate (6) is trapezoidal, so that a slope is formed between the upper skin (1) and the lower skin (2); the lower bottom of the rib plate (6) is provided with a C-shaped beam (3), the C-shaped beam (3) is provided with an upper profile, a lower profile and a web plate for connecting the upper profile and the lower profile, and the upper profile is connected with the inner side surface of the upper skin (1); the lower molded surface is connected with the inner side surface of the lower skin (2).

2. A VARI process composite small block level test piece according to claim 1, characterized in that the upper skin (1) is divided into a plurality of rectangular areas of different thickness along the lower base towards the upper base of the rib (6).

3. A VARI process composite small block level test piece according to claim 2, wherein the plurality of rectangular areas of different thickness gradually decrease in thickness in the direction from the lower base to the upper base of the rib (6).

4. A VARI process composite small-section grade test piece according to claim 1, characterized in that the rib (6) is a J-shaped rib, the rib (6) having a first bend in the direction of one side of the rib (6) at the connection with the lower skin (2), the first bend being fixedly connected with the lower skin (2) by means of a fastener; the joint of the rib plate (6) and the upper skin (1) is provided with a second bend and a third bend along the directions of two sides of the rib plate (6), and the second bend and the third bend are fixedly connected with the upper skin (1) through fasteners.

5. A VARI process composite small box grade test piece according to claim 1, characterized in that the rib plate (6) is fixedly connected with the C-beam (3) by means of an L-fillet (4).

6. A VARI process composite small block grade test piece according to claim 1, characterized in that the ribs (6) have three equally spaced apart.

7. A VARI process composite small box grade test piece according to claim 1, characterized in that the lower skin (2) has a flange at the upper bottom of the rib (6), said flange overlapping the upper skin (1) and being connected by means of fasteners.

8. The VARI process composite small block grade test piece according to claim 1, wherein the material of the VARI process composite small block grade test piece is mixed paved or woven fabric of type i type 2 CF3031 grade/YMS 3109 and type i type 2U 3160 grade/YMS 3109.