CN111993718A

CN111993718A - Composite sandwich board

Info

Publication number: CN111993718A
Application number: CN202010674647.8A
Authority: CN
Inventors: 许述财; 周剑飞; 黄彬兵; 殷绩伟; 宋家锋
Original assignee: Suzhou Automotive Research Institute of Tsinghua University
Current assignee: Suzhou Automotive Research Institute of Tsinghua University
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-11-27
Anticipated expiration: 2040-07-14
Also published as: CN111993718B

Abstract

The invention discloses a composite sandwich plate, which comprises a top plate, a core layer assembly and a bottom plate which are sequentially arranged from top to bottom, wherein the core layer assembly comprises a plurality of core pipes which are sequentially arranged along the length extension direction of the sandwich plate, each core pipe comprises a first pipe body, each first pipe body comprises a first pipe wall and a second pipe wall which are oppositely arranged, at least one of the first pipe wall and the second pipe wall is obliquely arranged relative to the top plate and the bottom plate, one end parts of the first pipe wall and the second pipe wall are intersected to form a V-shaped structure, the first pipe body further comprises a first arc-shaped pipe wall connected between the other end parts of the first pipe wall and the second pipe wall, and the first arc-shaped pipe wall is abutted to and fixedly connected with one part bearing impact load in the top plate and the bottom plate. The composite sandwich plate has a simple structure, and compared with a hexagonal honeycomb sandwich plate with consistent wall thickness, interval, height and other dimensions, the energy absorption effect of the sandwich plate per unit mass is obviously improved, and the mass is reduced.

Description

Composite sandwich board

Technical Field

The invention relates to the technical field of collision impact protection, in particular to a composite sandwich panel.

Background

With the development of military and civil fields such as aerospace, transportation and the like, the reduction of the structural mass to reduce the energy consumption is not the only target of structural design, and the characteristic of light weight and multiple purposes is required to be achieved in the structure, which becomes the mainstream trend. The sandwich board is used as a composite structure with wide application, has light weight and high specific strength, can be used as panels of various delivery vehicles, can absorb low and high-speed collision energy in civil delivery vehicles, and can resist explosion impact in military tools to reduce the injury of passengers. When the sandwich board is impacted by collision or explosion, the sandwich board is deformed by buckling and crushing by self in a controllable mode, impact kinetic energy is rapidly converted into deformation potential energy, the current common structural form of the sandwich board is a hexagonal honeycomb sandwich board, but under the high-speed impact condition, especially the explosion impact condition, the problem of poor energy absorption effect exists, therefore, the sandwich board with light weight and high energy absorption characteristic is designed, and the sandwich board has high practical value in the field of light weight design and safety protection of passengers.

Disclosure of Invention

It is an object of the present invention to address the problems of the prior art and to provide an improved composite sandwich panel.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a composite sandwich board, includes roof, core layer subassembly and the bottom plate that from the top set up in proper order downwards, core layer subassembly includes a plurality of edges the core pipe that the length extending direction of sandwich board set up in proper order, the core pipe includes first body, first body is including relative first pipe wall and the second pipe wall that sets up, first pipe wall with at least one part is relative in two parts of second pipe wall the roof with the bottom plate slope sets up, first pipe wall with the crossing V type structure that forms of a tip of second pipe wall, first body is still including connecting first pipe wall with first arc pipe wall between another tip of second pipe wall, first arc pipe wall with the roof with bear impact load in two parts of bottom plate inconsistent and rather than looks fixed connection.

Preferably, the first tube wall and the second tube wall are symmetrically arranged.

Preferably, the core pipe further comprises a second pipe body arranged above or below the first pipe body, the second pipe body comprises a third pipe wall and a fourth pipe wall which are arranged oppositely, at least one of the third pipe wall and the fourth pipe wall is arranged obliquely relative to the top plate and the bottom plate, one end parts of the third pipe wall and the fourth pipe wall are intersected to form a V-shaped structure, the second pipe body further comprises a second arc-shaped pipe wall connected between the other end parts of the third pipe wall and the fourth pipe wall, the small end of the first pipe body is fixedly connected with the small end of the second pipe body, one of the first arc-shaped pipe wall and the second arc-shaped pipe wall is abutted to the top plate and is fixedly connected with the top plate, and the other part is abutted to the bottom plate and is fixedly connected with the bottom plate.

Furthermore, the first pipe wall and the second pipe wall are symmetrically arranged, and the third pipe wall and the fourth pipe wall are symmetrically arranged.

Further, the core pipe further comprises a connecting portion arranged between the first pipe body and the second pipe body, and the small end of the first pipe body and the small end of the second pipe body are fixedly connected with the connecting portion respectively.

Furthermore, the connecting part is a circular tube with a circular section.

Further, the first pipe body and the second pipe body are symmetrically arranged.

Preferably, along the length extension direction of the sandwich plate, the adjacent sides of two adjacent core tubes are fixedly connected.

Preferably, the top plate and the bottom plate are made of the same material, and the material of the top plate and the material of the bottom plate have higher strength than the material of the core tube.

Furthermore, the top plate and the bottom plate are both made of low-carbon steel materials, and the core pipe is made of aluminum alloy materials.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the composite sandwich plate has simple structure, and compared with the hexagonal honeycomb sandwich plate with consistent wall thickness, interval, height and other dimensions, the energy absorption effect of the sandwich plate per unit mass is obviously improved, and the mass is reduced.

Drawings

FIG. 1 is a perspective view of a composite sandwich panel of the present invention;

FIG. 2 is a front view of the composite sandwich panel of the present invention;

FIG. 3 is a side view of the composite sandwich panel of the present invention;

figure 4 is an exploded view of the core tube of the composite sandwich panel of the present invention.

Detailed Description

The technical scheme of the invention is further explained by combining the attached drawings.

As shown in fig. 1 to 3, the composite sandwich panel of the present invention includes a top plate 1, a core layer assembly and a bottom plate 3 sequentially arranged from top to bottom.

The core layer assembly includes a plurality of core tubes 2, the plurality of core tubes 2 being sequentially arranged along a length extending direction of the sandwich panel, each core tube 2 extending from one end portion to the other end portion in a width direction of the sandwich panel.

As shown in fig. 1 to 4, each core tube 2 includes a first tube 21. The first pipe body 21 includes a first pipe wall 211 and a second pipe wall 212. The first tube wall 211 and the second tube wall 212 are disposed opposite to each other, in this embodiment, the top plate 1 and the bottom plate 3 are disposed in parallel, at least one of the two members of the first tube wall 211 and the second tube wall 212 is disposed obliquely with respect to the top plate 1 and the bottom plate 3, and one end portions of the first tube wall 211 and the second tube wall 212 are intersected to form a V-shaped structure. The first pipe 21 further includes a first arc-shaped pipe wall 213 connected between the other end portions of the first pipe wall 211 and the second pipe wall 212, and the first arc-shaped pipe wall 213 abuts against and is fixedly connected to one of the two components of the top plate 1 and the bottom plate 3, which is subjected to the impact load. Therefore, when the sandwich board bears impact load, the impact load firstly acts on the top plate 1 or the bottom plate 3 and then is transmitted to the core layer assembly, the structure of the core pipe 2 of the core layer assembly is similar to that of a mantis shrimp procambarus, the core pipe is of a hammer-shaped structure, and the sandwich board has a good energy absorption effect under high-speed collision or high-speed impact, so that the sandwich board has a good energy absorption effect under high-speed collision or high-speed impact.

Each core tube 2 may further include a second tube body 22 disposed above or below the first tube body 21. The second pipe body 22 includes a third pipe wall 221 and a fourth pipe wall 222 which are oppositely arranged, at least one of the third pipe wall 221 and the fourth pipe wall 222 is obliquely arranged relative to the top plate 1 and the bottom plate 3, one end portions of the third pipe wall 221 and the fourth pipe wall 222 are intersected to form a V-shaped structure, and the second pipe body 22 further includes a second arc-shaped pipe wall 223 connected between the other end portions of the third pipe wall 221 and the fourth pipe wall 222. The first tube 21 and the second tube 22 each have a large end and a small end, the first arc-shaped tube wall 213 is located at the large end of the first tube 21, and the second arc-shaped tube wall 223 is located at the large end of the second tube 22. The small end of the first pipe 21 is fixedly connected with the small end of the second pipe 22, one of the two parts of the first arc-shaped pipe wall 213 and the second arc-shaped pipe wall 223 is contacted with the top plate 1 and is fixedly connected with the top plate, and the other part is contacted with the bottom plate 3 and is fixedly connected with the bottom plate. Thus, the whole core tube 2 forms an arch structure, and the stress and pressure resistance performance of the arch structure is relatively better.

Each core tube 2 further includes a connecting portion 23 provided between the first tube body 21 and the second tube body 22, and the small end of the first tube body 21 and the small end of the second tube body 22 are fixedly connected to the connecting portion 23, respectively. In this embodiment, the connection portion 23 is a circular tube having a circular cross section. Thus, the stress concentration of the core tube 2 can be reduced, and the strength thereof can be improved.

Preferably, the first pipe wall 211 and the second pipe wall 212 are symmetrically arranged, and both the first pipe wall 211 and the second pipe wall 212 are obliquely arranged relative to the top plate 1 and the bottom plate 3. The third pipe wall 221 and the fourth pipe wall 222 are symmetrically arranged, and the third pipe wall 221 and the fourth pipe wall 222 are both obliquely arranged relative to the top plate 1 and the bottom plate 3. The first tube 21 and the second tube 22 are symmetrically disposed.

Along the length extension direction of the sandwich plate, the adjacent sides of the two adjacent core pipes 2 are fixedly connected, or a smaller gap is formed between the adjacent sides of the two adjacent core pipes 2, so that the whole core layer assembly has higher structural strength and can bear larger impact load.

In this embodiment, the thickness of roof 1 and bottom plate 3 is 1mm, and the thickness of first body 21 and second body 22 is also 1mm, and the thickness of pipe is 0.5 mm. The whole core pipe 2 forms a thin-wall hollow structure, so that the quality of the core pipe 2 can be effectively reduced, and the quality of the sandwich plate is reduced.

The top plate 1 and the bottom plate 3 are made of the same material, and the strength of the material of the top plate 1 and the strength of the material of the bottom plate 3 are higher than that of the material of the core pipe 2, so that the sandwich plate has gradient change on the material, and has better energy absorption effect while ensuring the strength. In this embodiment, the top plate 1 and the bottom plate 3 are both made of low carbon steel material, and the core tube 2 is made of aluminum alloy material.

In conclusion, when the sandwich panel is impacted by collision or explosion, the impact kinetic energy is rapidly converted into deformation potential energy by buckling, crushing and deforming the core tube 2 in a controllable mode, and compared with the hexagonal honeycomb sandwich panel with consistent wall thickness, interval, height and the like, the energy absorption effect of the sandwich panel per unit mass is remarkably improved, and the mass is reduced.

The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.

Claims

1. The utility model provides a composite sandwich board, includes roof, core layer subassembly and the bottom plate that from the top down set up in proper order, its characterized in that: the sandwich layer assembly comprises a plurality of core pipes which are arranged in sequence along the length extending direction of the sandwich plate, each core pipe comprises a first pipe body, each first pipe body comprises a first pipe wall and a second pipe wall which are arranged oppositely, at least one part in the first pipe wall and the second pipe wall is opposite to the top plate and the bottom plate, one end part of each first pipe wall and one end part of each second pipe wall are intersected to form a V-shaped structure, each first pipe body further comprises a first arc-shaped pipe wall connected between the first pipe wall and the other end part of the second pipe wall, and the first arc-shaped pipe wall is abutted to one part bearing impact load in the top plate and the two parts of the bottom plate and is fixedly connected with the top plate and the other part.

2. The composite sandwich panel of claim 1, wherein: the first pipe wall and the second pipe wall are symmetrically arranged.

3. The composite sandwich panel of claim 1, wherein: the core pipe is characterized by further comprising a second pipe body arranged above or below the first pipe body, the second pipe body comprises a third pipe wall and a fourth pipe wall which are arranged oppositely, at least one of the third pipe wall and the fourth pipe wall is opposite to the top plate and the bottom plate, one end of the third pipe wall and one end of the fourth pipe wall are intersected to form a V-shaped structure, the second pipe body further comprises a second arc-shaped pipe wall connected between the third pipe wall and the other end of the fourth pipe wall, the small end of the first pipe body is fixedly connected with the small end of the second pipe body, one of the first arc-shaped pipe wall and the second arc-shaped pipe wall is abutted to the top plate and fixedly connected with the top plate, and the other part is abutted to the bottom plate and fixedly connected with the bottom plate.

4. The composite sandwich panel of claim 3, wherein: the first pipe wall and the second pipe wall are symmetrically arranged, and the third pipe wall and the fourth pipe wall are symmetrically arranged.

5. The composite sandwich panel of claim 3, wherein: the core pipe further comprises a connecting part arranged between the first pipe body and the second pipe body, and the small end of the first pipe body and the small end of the second pipe body are fixedly connected with the connecting part respectively.

6. The composite sandwich panel of claim 4, wherein: the connecting part is a circular tube with a circular section.

7. The composite sandwich panel of claim 3, wherein: the first pipe body and the second pipe body are symmetrically arranged.

8. The composite sandwich panel of claim 1, wherein: and along the length extension direction of the sandwich plate, one adjacent side of each two adjacent core tubes is fixedly connected.

9. The composite sandwich panel of claim 1, wherein: the top plate and the bottom plate are made of the same material, and the strength of the material of the top plate and the material of the bottom plate are higher than that of the material of the core pipe.

10. The composite sandwich panel of claim 9, wherein: the top plate and the bottom plate are both made of low-carbon steel materials, and the core pipe is made of aluminum alloy materials.