CN209780634U

CN209780634U - Negative Poisson ratio honeycomb sandwich structure and sandwich plate

Info

Publication number: CN209780634U
Application number: CN201920043236.1U
Authority: CN
Inventors: 宋楠欣; 张文志; 李智威; 揭典民
Original assignee: Wuyi University
Current assignee: Wuyi University
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2019-12-13
Anticipated expiration: 2029-01-10

Abstract

The utility model discloses a negative poisson ratio honeycomb sandwich structure and sandwich panel, including the three constitutional unit that is interior concave hexagon, constitutional unit is including two contained angles that set up relatively, and the contained angle is sunken to hexagonal inboard, and the both sides of contained angle set up two long limits of parallel arrangement, and three constitutional unit end to end, make two liang of coincidences in long limit and constitute equilateral triangle. When meetting the face of big camber, the contained angle of invagination can absorb external energy to the internal contraction if the long limit of indent hexagon receives the extrusion, and the long limit if receives tensile, thereby the contained angle of invagination can outwards expand and make whole structure obtain the buffering to make into equilateral triangle with the indent hexagon and form honeycomb sandwich structure, improve sandwich structure's stability, thereby physical properties such as improvement product tensile, resistance to compression.

Description

Negative Poisson ratio honeycomb sandwich structure and sandwich plate

Technical Field

The utility model relates to a honeycomb structure field, especially a negative poisson's ratio honeycomb sandwich structure and sandwich panel.

Background

In daily life, the common material easily takes place hard collision in daily use and leads to the object to damage, if the cooperation of refrigeration house door and freezer car is used, because the refrigeration house door needs quick switch just can guarantee that the temperature in the middle of is unlikely to rise too much, consequently when taking out the material from the freezer car, easily take place door and car collision when closing the door and lead to the refrigeration house door to destroy, the destruction ratio that collision such as this type of in the life takes place is all, how to improve physical properties such as tensile resistance to compression that uses the product from the structure becomes the problem that the solution is badly needed.

At present, a lot of structures in daily life need to be made into honeycomb sandwich structures with larger curvature for load sharing so as to improve the properties of tensile strength, compressive strength and the like, but the common hexagonal honeycomb sandwich structure under the condition of large curvature is difficult to resist the requirement of large in-plane deformation in manufacturing and use, and saddle effect is easy to occur.

SUMMERY OF THE UTILITY MODEL

The present invention aims to solve at least one of the above-mentioned technical problems in the related art to a certain extent. Therefore, the utility model provides a negative poisson's ratio honeycomb sandwich structure.

The utility model provides a technical scheme that its technical problem adopted is:

The utility model provides a negative poisson ratio honeycomb sandwich structure, includes three constitutional unit that is indent hexagon, constitutional unit includes two contained angles that set up relatively, and the contained angle is sunken to hexagon's inboard, and the both sides of contained angle set up two long limits of parallel arrangement, and three constitutional unit end to end, make two liang of coincidences on long limit and constitute equilateral triangle.

As an improvement of the technical scheme, the length of two included angles forming the included angle is equal.

As a further improvement of the above technical scheme, the included angle between the long side of the same structural unit and the included angle side of the included angle is 60 degrees, and the included angle is set to be 60 degrees.

Furthermore, a supporting column for bearing load is further arranged on the angle bisector of the included angle.

A sandwich plate comprises a plurality of negative Poisson ratio honeycomb sandwich structures, wherein the plurality of honeycomb sandwich structures form the negative Poisson ratio honeycomb plate through long edge superposition.

As an improvement of the technical scheme, the four honeycomb sandwich structures form a basic unit, any overlapped long edge of the four honeycomb sandwich structures is overlapped to form a central shaft, the four honeycomb sandwich structures in the basic unit are uniformly distributed around the central shaft in a surrounding mode, and the basic unit forms a honeycomb sandwich plate through matrix arrangement.

Further, two adjacent basic units are connected through the same honeycomb sandwich structure.

The utility model has the advantages that: the utility model provides a negative poisson ratio honeycomb sandwich structure, includes three constitutional unit that is indent hexagon, constitutional unit includes two contained angles that set up relatively, and the contained angle is sunken to hexagon's inboard, and the both sides of contained angle set up two long limits of parallel arrangement, and three constitutional unit end to end, make two liang of coincidences on long limit and constitute equilateral triangle. When meetting the face of big camber, the contained angle of invagination can absorb external energy to the internal contraction if the long limit of indent hexagon receives the extrusion, and the long limit if receives tensile, thereby the contained angle of invagination can outwards expand and make whole structure obtain the buffering to make into equilateral triangle with the indent hexagon and form honeycomb sandwich structure, improve sandwich structure's stability, thereby physical properties such as improvement product tensile, resistance to compression.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a negative poisson's ratio honeycomb sandwich structure in the present invention;

FIG. 2 is a schematic structural diagram of a structural unit of the present invention;

Fig. 3 is a schematic structural diagram of a base unit in the present invention;

Fig. 4 is a schematic structural diagram of the honeycomb sandwich panel of the present invention.

Detailed Description

Referring to fig. 1 to 4, the utility model discloses a negative poisson's ratio honeycomb sandwich structure, including three constitutional unit 100 that is interior concave hexagon, constitutional unit 100 is including two contained angles 120 that set up relatively, and contained angle 120 is sunken to hexagonal inboard, and the both sides of contained angle 120 set up two long limits 110 of parallel arrangement, and three constitutional unit 100 end to end, make two liang of coincidences in long limit 110 and constitute equilateral triangle.

When encountering a large curvature surface, if the long edge 110 of the structural unit 100 is extruded, the inward included angle 120 will contract inwards to absorb external energy, and if the long edge 110 is stretched, the inward included angle 120 will expand outwards to buffer the whole structure, and the structural unit 100 is combined into an equilateral triangle to form the honeycomb sandwich structure 200, so that the stability of the sandwich structure is improved, and the tensile and compressive physical properties of the product are improved.

As an improvement of the above technical solution, the two included angle sides 130 forming the included angle 120 have equal lengths. When the extrusion or stretching is received, the forces applied to the two equal-length included-angle edges 130 are balanced, so as to ensure the stability of the whole structure unit 100

In a further improvement of the above technical solution, as a preferred embodiment, an included angle 120 between the long side 110 of the same structural unit 100 and an included angle side 130 of the included angle 120 is 60 °, and the included angle 120 is set to be 60 °. The included angle 120 forms an equilateral triangle, further improving the stress balance.

as a further improvement of the above embodiment, referring to fig. 1 and 2, a supporting column 140 for bearing load is further disposed on a bisector of the included angle 120. The supporting columns 140 serve as additional structures of the concave hexagonal structural unit 100, so that direct stress on the included angle 120 is effectively avoided, energy is transferred by the supporting columns 140, and buffering is performed by effectively utilizing the included angle 120.

A sandwich plate comprises a plurality of negative Poisson ratio honeycomb sandwich structures 200, wherein the plurality of honeycomb sandwich structures 200 are overlapped through long edges 110 to form the negative Poisson ratio honeycomb plate.

After the negative poisson ratio honeycomb sandwich structure 200 is overlapped or arranged according to a certain rule to form a sandwich plate, the tensile and compressive physical properties of the negative poisson ratio honeycomb sandwich structure 200 are utilized, so that the whole honeycomb sandwich plate is more stable, can bear more external impact, and can be prevented from being damaged.

Preferably, in one embodiment, four honeycomb sandwich structures 200 are combined into one base unit 300, any one of the coincident long sides 110 of the four honeycomb sandwich structures 200 is coincident with one another to form a central axis, the four honeycomb sandwich structures 200 of the base unit 300 are uniformly distributed around the central axis, and the base unit 300 is arranged in a matrix to form a honeycomb sandwich panel.

Referring to fig. 3, the honeycomb sandwich structure 200 is formed into a prism having a triangular cross section, any one side of the four prisms is overlapped to be a central axis and is uniformly distributed around the central axis to form a base unit 300, and the base units 300 are arranged in a matrix to form a honeycomb sandwich panel, so that the honeycomb sandwich structure 200 in the honeycomb sandwich panel is uniformly distributed, and thus the load is effectively and uniformly dispersed.

Preferably, two neighboring base units 300 are connected by the same honeycomb sandwich structure 200. As an embodiment, the same honeycomb sandwich structure 200 is used as a component of both base units, which allows for a better connection of the base units 300 and also a considerable space saving.

while the invention has been particularly shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A negative poisson's ratio honeycomb sandwich structure, characterized in that: including three constitutional unit that is indent hexagon, constitutional unit includes two contained angles that set up relatively, and the contained angle is sunken to hexagonal inboard, and the both sides of contained angle set up two long limits of parallel arrangement, and three constitutional unit end to end, make two liang of coincidences on long limit and constitute equilateral triangle.

2. The negative poisson's ratio honeycomb sandwich structure of claim 1, wherein: the length of two included angles forming the included angle is equal.

3. the negative poisson's ratio honeycomb sandwich structure of claim 1, wherein: the included angle between the long edge of the same structural unit and the included angle edge of the included angle is 60 degrees, and the included angle is set to be 60 degrees.

4. The negative poisson's ratio honeycomb sandwich structure of any one of claims 2-3, wherein: and a supporting column for bearing load is further arranged on the angle bisector of the included angle.

5. a sandwich panel, characterized by: the negative Poisson ratio honeycomb sandwich structure comprises a plurality of 1-4 honeycomb sandwich structures, wherein the plurality of honeycomb sandwich structures form a negative Poisson ratio honeycomb plate through long edge superposition.

6. A sandwich panel according to claim 5 wherein: the four honeycomb sandwich structures form a basic unit, any overlapped long edge of the four honeycomb sandwich structures is overlapped to form a central shaft, the four honeycomb sandwich structures in the basic unit are uniformly distributed around the central shaft in a surrounding mode, and the basic unit is arranged in a matrix mode to form a honeycomb sandwich plate.

7. A sandwich panel according to claim 6 wherein: two adjacent basic units are connected through the same honeycomb sandwich structure.