CN117087245A

CN117087245A - Zero poisson ratio core material, preparation method thereof and composite material

Info

Publication number: CN117087245A
Application number: CN202210519288.8A
Authority: CN
Inventors: 王清明; 黄占河; 黄静波
Original assignee: Beijing Hongxin Business Service Center
Current assignee: Beijing Hongxin Business Service Center
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2023-11-21
Also published as: WO2023217048A1

Abstract

The invention provides a zero poisson ratio core material, which is formed by arranging a plurality of same type of cell units without gaps; the cell unit comprises two first type unit walls which are arranged in opposite directions and two second type unit walls which are arranged in opposite directions, wherein the two first type unit walls are connected through the two second type unit walls and jointly surround to form the cell unit; the first type cell walls and the second type cell walls are walls shared by adjacent cell units; the first type cell walls are used as one cell wall of the cell unit, and the two first type cell walls are arranged in parallel; the second type unit wall at least comprises two cell walls which are connected in sequence, and an included angle is formed between the two cell walls which are connected in sequence in the second type unit wall, so that the second type unit wall is of a bending structure. The structure is simple, and the Poisson ratio is zero. The invention also provides a preparation method of the core material with zero poisson ratio and a composite material using the core material with zero poisson ratio.

Description

Zero poisson ratio core material, preparation method thereof and composite material

Technical Field

The invention relates to the technical field of composite materials, in particular to a zero poisson ratio core material, a preparation method thereof and a composite material.

Background

The core material for the sandwich structure, in particular to a hexagonal honeycomb core material, is made of one of nonmetallic materials or metallic materials such as aramid paper, aluminum foil, glass fiber cloth, carbon fiber cloth, stainless steel foil, high-temperature alloy foil, kraft paper and the like. The hexagonal honeycomb core material made of the aramid paper is a hot spot developed at present, is a honeycomb core material in a hexagonal cell shape which is made of the aramid paper through a series of complex processes of coating, laminating, sheet laminating, curing, cutting, expanding, gum dipping, resin curing and the like, is an advanced composite material reinforced by the high-strength and high-modulus aramid paper, has numerous advantages of light weight, high strength, high modulus, flame retardance, high temperature resistance, low dielectric loss and the like, and has been widely applied to the aerospace field and other civil fields.

Fig. 1 is a schematic structural view of a hexagonal honeycomb core material according to the prior art. As shown in fig. 1, the conventional hexagonal core material cell unit 1 ' is a regular hexagon, which is arranged to form a honeycomb structure, but six cell walls 11 ' of the regular hexagon 1 ' are all in a straight state, and when one direction of the core material is unfolded in the LW plane, the other direction perpendicular thereto can only be reduced in size, and when one direction is compressed, the other direction perpendicular thereto can only be extended, thereby causing the hexagonal core material of the straight cell walls to become a "saddle shape" in the course of bending. Therefore, the existing hexagonal honeycomb core material has poor deformability, does not have the poisson ratio characteristic, and the application field is limited.

The variant structure has positive effects on improving the flight safety and improving the taking-off and landing performances of the airplane so as to adapt to taking-off and landing at airports (such as a sprint airport) under various conditions; meanwhile, a new control surface design and flow control method can be formed on the basis of a deformation technology, and the control and control quality of the aircraft is improved; and the variant structure is combined with the intelligent deformation technology, so that the contradiction of pneumatic layout of different design points can be solved, the multifunction is improved, the take-off can be realized on a short runway, the range is increased, and the economical efficiency and the combat efficiency are improved.

Therefore, there is a need for a core material having excellent deformability and zero poisson's ratio characteristics.

Disclosure of Invention

First, the technical problem to be solved

In view of the problems with the above-described techniques, the present invention addresses, at least to some extent. To this end, a first object of the present invention is to propose a core material that is simple in structure and has a zero poisson's ratio characteristic.

The second object of the present invention is to provide a method for preparing a core material with zero poisson's ratio.

A third object of the invention is to propose a composite material using a core material with zero poisson's ratio.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:

The invention provides a zero poisson ratio core material, which is formed by arranging a plurality of same type of cell units without gaps; the cell unit comprises two first type unit walls which are arranged in opposite directions and two second type unit walls which are arranged in opposite directions, wherein the two first type unit walls are connected through the two second type unit walls and jointly surround to form the cell unit; the first type cell walls and the second type cell walls are walls shared by adjacent cell units; the first type cell walls are used as one cell wall of the cell unit, and the two first type cell walls are arranged in parallel; the second type unit wall at least comprises two cell walls which are connected in sequence, and an included angle is formed between the two cell walls which are connected in sequence in the second type unit wall, so that the second type unit wall is of a bending structure.

Optionally, the core is formed by stacking a plurality of folded sheets; each layer of bending thin plate is formed by sequentially connecting a plurality of folding units of the same type, each folding unit comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 first type unit walls which are sequentially connected, and the shape of the second plate part is the same as that of 1 second type unit wall; and the adjacent two bending thin plates are surrounded to form a cell unit, and the joint parts between the adjacent two bending thin plates are connected through a connecting structure. Alternatively, the included angle between two cell walls connected in turn in the second type of cell wall is 10-180 degrees.

Optionally, when the second type of cell walls are more than three cell walls connected in sequence, the second type of cell walls form a wave-shaped bending structure.

Optionally, the width of each cell wall of the cell unit is equal; the width of the cell walls of the cell units is 2-8 mm.

The invention provides a preparation method of a zero poisson ratio core material, which is used for preparing the zero poisson ratio core material with a second type of unit wall comprising two cell walls connected in sequence, and comprises the following steps:

and S1, stacking a plurality of sheet materials, and bonding adjacent sheet materials to obtain a laminated plate. In the laminated plate, a plurality of equidistant mutually parallel adhesive lines are arranged between adjacent sheet materials to bond the adjacent sheet materials, each adhesive line comprises a first sub-adhesive line and a second sub-adhesive line which are sequentially arranged along the same width direction, and the bonding strength of the second sub-adhesive line is 10% -80% of that of the first sub-adhesive line; the bonding agent lines on the next layer of sheet material are overlapped on the bonding agent lines of the previous layer of sheet material in the same direction and dislocation way, and the first sub-adhesive lines on the next layer of sheet material are overlapped with the second sub-adhesive lines on the previous layer of sheet material;

S2, unfolding the laminated plate in the direction perpendicular to the sheet material, and unfolding unbonded parts in the sheet material to obtain a diamond-shaped lattice core material;

and S3, after stabilizing the diamond-shaped cell core material, unfolding the diamond-shaped cell core material in the direction perpendicular to the sheet material, and unfolding the bonding part of the second sub-adhesive lines in the diamond-shaped cell core material to obtain the core material with zero poisson ratio.

As an improvement of the method, the bonding strength of the second sub-adhesive lines is 10% to 80% of the bonding strength of the first sub-adhesive lines, comprising: regulating the width of the sub-adhesive lines to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines is 10% -80% of the glue spreading amount of the first sub-adhesive lines; or the sub-adhesive lines are strips formed by arranging gaps of the adhesive block units, and the gap distance between the adhesive block units in the sub-adhesive lines is adjusted to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines is 10% -80% of the glue spreading amount of the first sub-adhesive lines.

As an improvement of the method, stacking a plurality of sheet materials and bonding between adjacent sheet materials, comprising: stacking a plurality of sheets of sheet material, each layer of sheet material having lines of adhesive applied to a same face thereof for bonding between adjacent sheets of material; alternatively, a plurality of sheets of sheet material are stacked, and only the even-numbered layers of sheet material are coated with lines of adhesive on both sides thereof to bond between adjacent sheet materials.

As an improvement of the method, step S3 further includes: stabilizing the zero poisson ratio core material; wherein, stabilize the processing to diamond cell core, include: carrying out high-temperature treatment on the diamond-shaped cell core material; and/or impregnating the diamond-shaped cell core material with a resin solution and curing the resin; stabilizing the zero poisson ratio core material, and further comprising: performing high-temperature treatment on the core material with the zero poisson ratio; and/or, impregnating the zero poisson's ratio core material with a resin solution and curing the resin.

The invention provides a preparation method of a zero poisson ratio core material, which is used for preparing the zero poisson ratio core material with a second type of unit wall comprising three cell walls connected in sequence, and comprises the following steps:

step S1, stacking a plurality of sheet materials, and bonding adjacent sheet materials to obtain a laminated plate; in the laminated plate, a plurality of equidistant mutually parallel adhesive lines are arranged between adjacent sheet materials to bond the adjacent sheet materials, each adhesive line comprises a second sub-adhesive line, a first sub-adhesive line and a second sub-adhesive line which are sequentially arranged along the same width direction, and the bonding strength of the second sub-adhesive line is 10% -80% of that of the first sub-adhesive line; the bonding agent lines on the back layer of sheet material are overlapped on the bonding agent lines of the front layer of sheet material in the same direction and dislocation mode, the first sub-adhesive lines on the back layer of sheet material are overlapped with the second sub-adhesive lines on the front layer of sheet material, and the second sub-adhesive lines on the back layer of sheet material are overlapped with the first sub-adhesive lines on the front layer of sheet material;

and S3, after stabilizing the diamond-shaped cell core material, unfolding the diamond-shaped cell core material in the direction perpendicular to the sheet material, and unfolding the part bonded by the second sub-adhesive lines in the diamond-shaped cell core material to obtain the core material with zero poisson ratio.

As an improvement of the method, the bonding strength of the second sub-adhesive lines is 10% to 80% of the bonding strength of the first sub-adhesive lines, comprising: regulating the width of the sub-adhesive lines to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines is 10% -80% of the glue spreading amount of the first sub-adhesive lines; or,

the sub-adhesive lines are strips formed by arranging gaps of adhesive block units, and the gap distance between the adhesive block units in the sub-adhesive lines is adjusted to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines is 10% -80% of the glue spreading amount of the first sub-adhesive lines.

As an improvement of the method, stacking a plurality of sheet materials and bonding between adjacent sheet materials, comprising: stacking a plurality of sheets of sheet material, and applying lines of adhesive on the same face of each layer of sheet material to bond between adjacent sheets of material; alternatively, a plurality of sheets of sheet material are stacked, and lines of adhesive are applied to both sides of an even number of layers of sheet material to bond between adjacent sheet materials.

As an improvement of the method, step S3 further includes: stabilizing the zero poisson ratio core material; wherein, stabilize the processing to diamond cell core, include: carrying out high-temperature treatment on the diamond-shaped cell core material; and/or impregnating the diamond-shaped cell core material with a resin solution and curing the resin; stabilizing the zero poisson ratio core material, comprising: performing high-temperature treatment on the core material with the zero poisson ratio; and/or, impregnating the zero poisson's ratio core material with a resin solution and curing the resin.

The invention provides a preparation method of a zero poisson ratio core material, wherein the zero poisson ratio core material is formed by stacking a plurality of layers of bending thin plates, each layer of bending thin plates is formed by sequentially connecting a plurality of folding units of the same type, each folding unit comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 sequentially connected first type unit walls, and the shape of the second plate part is the same as that of 1 second type unit wall; the adjacent two bending thin plates are surrounded to form a cell unit, and the joint parts between the adjacent two bending thin plates are connected through a connecting structure;

the preparation method comprises the following steps:

s1, obtaining a plurality of bending thin plates;

S2, arranging a connecting structure on a first plate part of the bent thin plate, and sequentially arranging a plurality of bent thin plates to form a shape of a core material with zero Poisson ratio; and connecting adjacent bending thin plates through a connecting structure to obtain the core material with zero poisson ratio.

The invention provides a preparation method of a core material with zero poisson ratio, which comprises the following steps:

and S1, manufacturing a casting mould according to the core material with the zero poisson ratio.

S2, selecting a matrix material of the core material, and pouring the matrix material of the core material into a casting mold; and (5) opening the mould to obtain the core material with zero poisson ratio.

The invention provides a preparation method of a core material with zero poisson ratio, which comprises the following steps: and printing the core material matrix material on 3D printing equipment according to a pre-designed model diagram to obtain the zero poisson ratio core material.

The invention also provides a composite material, which comprises the zero poisson ratio core material and a panel covered on the zero poisson ratio core material, wherein the zero poisson ratio core material is the core material.

(III) beneficial effects

The beneficial effects of the invention are as follows:

1. the core material provided by the invention has the advantages of light weight, high strength, high modulus, flame retardance, high temperature resistance and low dielectric loss, has the characteristic of zero poisson ratio, is suitable for manufacturing a high-strength sandwich structure, and is particularly suitable for being used as a core material for supporting in a variant structure. In addition, the core material provided by the embodiment is composed of only one type of cell unit, and the cell unit is square-like, has a simple structure, and provides conditions for a simple and low-cost core material preparation process.

2. According to the preparation method of the core material, a plurality of sheet materials are stacked, bonding is carried out between adjacent sheet materials to form a laminated plate, and then expansion operation is carried out on the laminated plate twice, so that the core material with the Poisson's ratio of single Qu Ling can be prepared and obtained, the process is simple, the preparation is rapid, mass production can be carried out, and the cost is very low. The invention also provides that the adhesive lines formed by the first sub-adhesive lines and the second sub-adhesive lines which are sequentially arranged in the same width direction and have different glue coating amounts are adopted to bond adjacent sheet materials, and the adhesive lines on the later sheet material are matched to be overlapped on the adhesive lines of the former sheet material in the same direction and in a staggered manner, so that a laminated plate can be prepared, and a single Qu Ling Poisson ratio core material can be prepared through two expansion operations.

3. According to the preparation method of the core material, firstly, a plurality of sheet materials are stacked, bonding is carried out between adjacent sheet materials to form a laminated plate, and then expansion operation is carried out on the laminated plate twice, so that the hyperbolic zero poisson ratio core material can be prepared and obtained, the process is simple, the preparation is rapid, mass production can be carried out, and the cost is very low. The invention also provides that the adhesive lines formed by the second sub-adhesive lines, the first sub-adhesive lines and the second sub-adhesive lines which are sequentially arranged in the same width direction and have different glue coating amounts are adopted to bond adjacent sheet materials, and the adhesive lines on the back sheet material are matched with the adhesive lines on the front sheet material to be overlapped in the same direction and in a staggered manner, so that a laminated plate can be prepared, and the hyperbolic zero poisson ratio core material can be prepared through two expansion operations.

Drawings

The invention is described with the aid of the following figures:

FIG. 1 is a schematic perspective view of a hexagonal honeycomb core material of the prior art;

FIG. 2 is a schematic illustration of a single-sided adhesive coated strand of sheet material in example 2 of the present invention;

FIG. 3 is a schematic view showing the structure of a laminated plate of a first form formed by stacking sheet materials coated with adhesive lines on one side in example 2 of the present invention;

FIG. 4 is a schematic structural view of a laminated sheet of a second form formed by stacking sheet materials coated on one side with lines of adhesive in example 2 of the present invention;

fig. 5 is a schematic structural view of a laminated plate formed by alternately stacking a sheet material coated with adhesive stripes on both sides and a sheet material not coated with adhesive stripes in example 2 of the present invention;

FIG. 6 is a schematic diagram of the structure of a diamond-shaped cell core material in example 2 of the present invention;

fig. 7 is a schematic structural view of the zero poisson's ratio core material of examples 1 and 2 of the present invention, in which adhesive lines are shown, and the first type of cell wall is formed by stacking 2 layers of sheet materials;

FIG. 8 is a schematic structural view of a zero Poisson's ratio core material of example 1 of the present invention, wherein adhesive lines are shown and a first type of cell wall is formed from a stack of 3 sheets of material;

Fig. 9 is a schematic structural view of the zero poisson's ratio core material of examples 1 and 2 of the present invention, in which adhesive lines are not shown;

fig. 10 is a schematic perspective view of the zero poisson's ratio core material according to the embodiment 1 and embodiment 2 of the present invention;

FIG. 11 is a schematic illustration of a single-sided adhesive coated strand of sheet material in example 4 of the present invention;

FIG. 12 is a schematic view showing the structure of a laminated plate of a first form formed by stacking sheet materials with adhesive lines coated on one side in example 4 of the present invention;

FIG. 13 is a schematic view showing the structure of a laminated plate of a second form formed by stacking sheet materials coated with adhesive lines on one side in example 4 of the present invention;

fig. 14 is a schematic structural view of a laminate formed by alternately stacking a sheet material coated with adhesive stripes on both sides and a sheet material not coated with adhesive stripes in example 4 of the present invention;

FIG. 15 is a schematic view showing the structure of a diamond-shaped cell core material in example 4 of the present invention;

fig. 16 is a schematic structural view of the zero poisson's ratio core material in examples 3 and 4 of the present invention, in which adhesive lines are shown, and the first type of cell wall is formed by stacking 2 layers of sheet materials;

fig. 17 is a schematic structural view of the zero poisson's ratio core material of examples 3 and 4 of the present invention, in which adhesive lines are not shown;

Fig. 18 is a schematic perspective view of the zero poisson's ratio core material in examples 3 and 4 of the present invention;

FIG. 19 is a schematic view showing the structure of a single Qu Ling Poisson's ratio core in example 5 of the present invention, wherein the thick lines show one folded sheet and one folded unit;

fig. 20 is a schematic structural view of a hyperbolic zero poisson's ratio core material in example 5 of the present invention, in which thick lines are drawn to show one bent sheet and one folded unit.

[ reference numerals description ]

1': a cell unit; 11': a cell wall;

1: a cell unit;

11: a first type of cell wall; 12: a second type of cell wall;

2: a sheet material;

4: an adhesive line;

41: a first line of sub-adhesive; 42: a second line of sub-adhesive;

5: bending the thin plate;

51: a folding unit;

7: diamond-shaped cell core material.

Detailed Description

The invention will be better explained by the following detailed description of the embodiments with reference to the drawings. The "L direction" referred to herein is the core strip direction, "W direction" is the core deployment direction, and "T direction" is the core thickness direction, these 3 directions are perpendicular to each other with reference to the orientation of fig. 1.

Example 1

As shown in fig. 7 to 10, the present embodiment provides a zero poisson's ratio core material formed by arranging a plurality of same type of cell units 1 without gaps, wherein the cell units 1 are the smallest repeating units forming a closed structure in the core material.

The cell unit 1 comprises two opposite first type cell walls 11 and two opposite second type cell walls 12, wherein the two first type cell walls 11 are connected through the two second type cell walls 12 and jointly surround to form the cell unit 1; the first type cell walls 11 and the second type cell walls 12 are walls common to adjacent cells; the first type cell wall 11 is used as one cell wall of the cell unit 1, the two first type cell walls 11 are arranged in parallel, the second type cell wall 12 comprises two cell walls (in this embodiment, the first cell wall and the second cell wall respectively) which are connected in sequence, and an included angle is formed between the two cell walls which are connected in sequence in the second type cell wall 12, so that the second type cell wall 12 is of a bent structure. Where the cell walls represent the planes of the cell units 1.

The core material has the advantages of light weight, high strength, high modulus, flame retardance, high temperature resistance and low dielectric loss, and is applied to the aerospace field, the civil fields of ships, high-speed railways and the like; in addition, when the core material provided by the embodiment receives the tensile force/pressure in the W direction, the tensile force/pressure acts on the cell unit 1, the dimension of the cell unit in the W direction is increased/reduced, meanwhile, under the action of the tensile force/pressure, the included angle between the first cell wall and the second cell wall is increased/reduced, and the generated deformation is compensated by the increase/reduction of the included angle between the first cell wall and the second cell wall in the adjacent cell unit 1 in the L direction, so that the core material provided by the embodiment has the zero poisson ratio characteristic, is suitable for manufacturing high-strength sandwich structures, and is particularly suitable for the core material serving as a support in a variant structure; moreover, the core material provided by the embodiment is composed of only one type of cell unit 1, and the cell unit 1 is square-like, has a simple structure, and provides conditions for a simple and low-cost core material preparation process.

In the second type cell walls 12, the angle formed between two cell walls connected in sequence means that the two cell walls connected in sequence are not parallel to each other. Preferably, the included angle formed between two cell walls connected in sequence is 10-180 degrees. It is further preferred that the angle formed between two cell walls connected in sequence is 60 to 120 °.

Preferably, the length of each cell wall of the cell unit 1 (the length of the cell wall in the LW plane, i.e., the width of the cell wall) in the LW plane (i.e., the plane formed by the L direction and the W direction of the core material) is equal. The provision of the cell units 1 of such a shape facilitates the formation of a core material of high strength and high structural stability. It is conceivable that the width of each cell wall of the cell unit 1 is not equal, and a similar effect can be achieved.

Preferably, the width of the cell walls of the cell unit 1 is 2 to 8mm. It is further preferred that the width of the cell walls of the cell units 1 is 3-5 mm.

Preferably, as shown in fig. 7, 8 and 19, the core material is formed by stacking a plurality of folded thin plates 5; each layer of bending thin plate 5 is formed by sequentially connecting a plurality of folding units 51 of the same type, each folding unit 51 comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 first type unit walls 11 which are sequentially connected, and the shape of the second plate part is the same as that of 1 second type unit wall 12; the adjacent two bending thin plates 5 are surrounded to form a cell unit 1, and the joint parts between the adjacent two bending thin plates 5 are connected through a connecting structure. The arrangement further creates conditions for the preparation process of the core material with simple and low cost.

Since the shape of the first plate portion is the same as the shape of 2 or more sequentially connected first-type cell walls 11, the first-type cell walls in the formed core material include at least 2 layers of sheet material. As shown in fig. 7, the first plate portion of the folding unit 51 has the same shape as that of 2 sequentially connected first type unit walls 11, and the first type unit walls in the formed core material are formed by stacking 2 layers of sheet materials. As shown in fig. 8, the first plate portion of the folding unit 51 has the same shape as that of 3 sequentially connected first type unit walls 11, and the first type unit walls in the formed core material are formed by stacking 3 layers of sheet materials. Further preferably, the first type of cell wall is formed from a stack of 2 to 5 layers of sheet material.

Further preferably, in the present embodiment, the connection structure between the two first-type cell walls 11 arranged without gaps in the W direction is an adhesive. It is conceivable that the connection structure between the two first type cell walls 11 arranged without gaps in the W direction may be solder, so that the adjacent cells 1 may be welded, and in a specific implementation, a plurality of welding modes such as laser welding may be used. Of course, the above connection structure may be other structures or materials capable of performing the connection function in the field.

Specifically, the sheet material 2 is one of aramid paper, polyimide paper, PBO fiber paper, kraft paper, glass fiber cloth, carbon fiber cloth, aluminum foil, stainless steel foil, titanium alloy foil, high temperature alloy foil, and iron-chromium aluminum foil.

Example 2

This example provides a method of making the zero poisson's ratio core of example 1, comprising the steps of:

step S1, stacking a plurality of sheet materials 2, and bonding between adjacent sheet materials 2 to obtain a laminated plate.

As shown in fig. 3, 4 and 5, in the laminated board, a plurality of adhesive lines 4 parallel to each other at equal intervals are arranged between adjacent sheet materials 2 to bond the adjacent sheet materials 2, each adhesive line 4 includes a first sub-adhesive line 41 and a second sub-adhesive line 42 sequentially arranged in the same width direction (the "width direction" is the width direction of the adhesive line 4), and the bonding strength of the second sub-adhesive line 42 is 10% to 80% of the bonding strength of the first sub-adhesive line 41; the lines of adhesive 4 on the subsequent sheet material 2 are partially overlapped with the lines of adhesive 4 on the previous sheet material 2 in a co-directional offset manner, and the lines of first sub-adhesive 41 on the subsequent sheet material are overlapped with the lines of second sub-adhesive 42 on the previous sheet material.

Wherein, the first sub-adhesive lines 41 and the second sub-adhesive lines 42 in the adhesive lines 4 shown in fig. 3 and 5 are sequentially arranged in the first width direction ("width direction" is the width direction of the adhesive lines 4), and the first sub-adhesive lines 41 and the second sub-adhesive lines 42 in the adhesive lines 4 shown in fig. 4 are sequentially arranged in the second width direction.

Preferably, in the laminate, adjacent sheet materials 2 are completely overlapped, and the plurality of adhesive lines 4 on each layer of sheet material are distributed on the surface of the sheet material 2 where the adhesive lines are located. Thus, the sheet material 2 was effectively utilized to prepare the core material in example 1.

Preferably, in the laminate, the connection position of the first sub-adhesive stripes 41 and the second sub-adhesive stripes 42 on the subsequent sheet material is flush with the free end of the second sub-adhesive stripes 42 on the previous sheet material.

It is further preferred that the first lines of sub-adhesive 41 on the subsequent layer of sheet material fully overlap the second lines of sub-adhesive 42 on the previous layer of sheet material, i.e. that the width of the first lines of sub-adhesive 41 is equal to the width of the second lines of sub-adhesive 42 (as shown in fig. 2). It is further preferred that on the same layer of sheet material, the spacing between adjacent two lines of adhesive 4 is 2 times the width of the lines of sub-adhesive. In this way, it is possible to produce the cell unit 1 in which the lengths of each cell wall in the LW plane are equal.

Preferably, the bonding strength of the second sub-adhesive lines 42 is 10% to 80% of that of the first sub-adhesive lines 41, including: the glue amount of the second sub-adhesive stripes 42 is 10% to 80% of the glue amount of the first sub-adhesive stripes 41. Further preferably, the amount of the sub-adhesive lines is controlled by the width of the sub-adhesive lines; alternatively, the lines of sub-adhesive are stripes formed by the arrangement of the gaps between the adhesive block units, and the amount of glue of the lines of sub-adhesive is controlled by the gap distance between the adhesive block units in the lines of sub-adhesive.

Preferably, in the present embodiment, stacking a plurality of sheet materials 2 and bonding between adjacent sheet materials 2 includes: a plurality of sheets of sheet material 2 are stacked, and the same face of each layer of sheet material 2 is coated with lines of adhesive 4 to bond between adjacent sheets of material 2, as shown in figures 3 and 4. Of course, this is only preferred, and it is conceivable to stack a plurality of sheet materials 2, and apply lines of adhesive 4 to both sides of the even-numbered sheet materials 2 to bond between adjacent sheet materials 2, as shown in fig. 5.

Specifically, bonding is performed between adjacent sheet materials 2, and further includes: the stacked adhesive-coated sheets of material 2 are subjected to a curing process. This step is directed to the adhesive that needs to be cured to form an effective bond between adjacent sheet materials 2; of course, for non-cured adhesives, other treatments than curing may be used in this step to provide effective bonding between adjacent sheet materials 2.

And S2, unfolding the laminated plate in the direction perpendicular to the sheet material, and unfolding the unbonded part in the laminated plate to obtain the diamond-shaped cell core material 7. As shown in fig. 6.

And S3, after stabilizing the diamond-shaped cell core material, unfolding the diamond-shaped cell core material 7 in the direction perpendicular to the sheet material, and unfolding the part bonded by the second sub-adhesive lines 42 in the diamond-shaped cell core material 7 to obtain a single Qu Ling Poisson ratio core material (single bending refers to the existence of one bending in the second type unit wall 12). As shown in fig. 7 and 8.

Preferably, the diamond-shaped cell core 7 is subjected to a stabilization treatment comprising: carrying out high-temperature treatment on the diamond-shaped cell core material 7; and/or, the diamond-shaped cell core 7 is immersed in the resin solution, and is subjected to drying and curing treatment. Further preferably, the temperature of the high temperature treatment is 200 to 300℃and the time of the high temperature treatment is 20 to 50 minutes.

Preferably, step S3 further comprises: the single Qu Ling poisson ratio core material was stabilized. Further preferably, the stabilizing the single Qu Ling poisson's ratio core includes: performing high-temperature treatment on the single Qu Ling Poisson ratio core material; and/or impregnating the single Qu Ling poisson's ratio core material with a resin solution and curing the resin.

The resin solution used in the stabilizing treatment process of the diamond-shaped cell core material and the stabilizing treatment process of the single Qu Ling Poisson ratio core material is one or more of phenolic resin, polyimide resin, cyanate resin, polyester, bismaleimide resin and epoxy resin.

And S4, sawing and/or slicing the single Qu Ling Poisson ratio core material to obtain a finished core material.

According to the preparation method of the core material with the zero poisson ratio, a plurality of sheet materials 2 are stacked, bonding is carried out between adjacent sheet materials 2 to form a laminated plate, and then the laminated plate is subjected to two unfolding operations, so that the core material with the single poisson ratio Qu Ling can be prepared and obtained, the process is simple, the preparation is rapid, mass production can be carried out, and the cost is very low. Moreover, in this embodiment, it is proposed that the adhesive lines 4 composed of the first sub-adhesive lines 41 and the second sub-adhesive lines 42 with different glue spreading amounts sequentially arranged in the same width direction are used to bond the adjacent sheet materials 2, and the adhesive lines 42 on the subsequent sheet material 2 are overlapped on the adhesive lines 41 of the previous sheet material 2 in the same direction and offset manner, so that a laminated board can be prepared to prepare a single Qu Ling poisson ratio core material through two expansion operations.

The method for preparing the core material with zero poisson ratio in example 1 provided in this example is specifically described below by way of an example, and includes the following steps:

step A1, selecting aramid paper with the thickness of 0.05mm as a sheet material 2; stacking a plurality of aramid papers, each layer of aramid paper having an adhesive line 4 coated on the same surface thereof to bond between adjacent aramid papers, obtaining a plurality of layers of aramid papers, and curing the adhesive to obtain the laminate in the above step S1. As shown in fig. 3.

Wherein the adhesive is J-80B Nomex paper honeycomb sandwich adhesive developed by the institute of petrochemistry of Heilongjiang; the adhesive was coated on the aramid paper using a gravure coater.

Wherein, in the laminated board, each adhesive line 4 comprises a first sub adhesive line 41 and a second sub adhesive line 42 which are sequentially arranged along a first width direction (the width direction is the width direction of the adhesive line 4), the glue coating amount of the second sub adhesive line 42 is 35% of the glue coating amount of the first sub adhesive line 41, the width of the adhesive line 4 is 6mm, and the interval between two adjacent adhesive lines 4 is 6mm.

Wherein, the curing treatment is carried out on the adhesive, which comprises the following steps: the multi-layered aramid paper is placed in a heated press to impart a cohesive effect to the binder under conditions of heat and pressure. Specifically, the temperature was set at 180.+ -. 5 ℃, the pressure was set at 0.4 MPa.+ -. 0.05MPa, and the pressing time was set at 180.+ -. 5 minutes.

And A2, expanding the laminated plate in the direction perpendicular to the thin plate material, and expanding unbonded parts in the laminated plate to obtain the diamond-shaped cellular material. As shown in fig. 6.

And A3, placing the diamond-shaped cellular material in a high-temperature drying oven, and baking for 30+/-5 minutes at 260+/-5 ℃ to obtain the stabilized diamond-shaped cellular core material 7.

And A4, expanding the diamond-shaped cell core material 7 subjected to the stabilization treatment in the direction perpendicular to the sheet material, and expanding the positions, bonded by the second sub-adhesive lines 42, in the diamond-shaped cell core material 7 to obtain the single Qu Ling Poisson ratio core material. As shown in fig. 7 and 8. The cell wall widths of the cell units 1 of the single Qu Ling Poisson ratio core material prepared by the method are 3.0mm, and the density of the core material is about 36.7kg/m ³ 。

Example 3

As shown in fig. 16 to 18, the present embodiment provides a zero poisson's ratio core material formed by arranging a plurality of same type of cell units 1 without gaps, wherein the cell units 1 are the smallest repeating units forming a closed structure in the core material.

The cell unit 1 comprises two opposite first type cell walls 11 and two opposite second type cell walls 12, wherein the two first type cell walls 11 are connected through the two second type cell walls 12 and jointly surround to form the cell unit 1; the first type cell walls 11 and the second type cell walls 12 are walls common to adjacent cells; the first type cell walls 11 serve as one cell wall of the cell unit 1, two first type cell walls 11 are arranged in parallel, the second type cell walls 12 include three cell walls (in this embodiment, a first cell wall, a second cell wall and a third cell wall) connected in sequence, and included angles are formed between the three cell walls connected in sequence in the second type cell walls 12, so that the second type cell walls 12 are of a bent structure. Where the cell walls represent the planes of the cell units 1.

The core material has the advantages of light weight, high strength, high modulus, flame retardance, high temperature resistance and low dielectric loss, and is applied to the aerospace field, the civil fields of ships, high-speed railways and the like; in addition, when the core material proposed in this embodiment receives a tensile force/pressure force in the W direction, the tensile force/pressure force acts on the cell unit 1, the dimension in the W direction of the cell unit 1 increases/decreases, and simultaneously, under the action of the tensile force/pressure force, the included angle between the first cell wall and the second cell wall increases/decreases, the generated deformation is compensated by increasing/decreasing the included angle between the first cell wall and the second cell wall in the adjacent cell unit 1 in the L direction, the included angle between the second cell wall and the third cell wall increases/decreases, and the generated deformation is compensated by increasing/decreasing the included angle between the second cell wall and the third cell wall in the adjacent cell unit 1 in the L direction, so that the core material proposed in this embodiment has the characteristics of zero poisson ratio, is suitable for manufacturing high-strength sandwich structures, and is particularly suitable for core materials serving as supports in variant structures; moreover, the core material provided by the embodiment is composed of only one type of cell unit 1, and the cell unit 1 is square-like, has a simple structure, and provides conditions for a simple and low-cost core material preparation process.

In the second type cell walls 12, the angle formed between two cell walls connected in sequence means that the two cell walls connected in sequence are not parallel to each other. Preferably, the second type of cell walls 12 form a wave-like bent structure, with an included angle of 10-120 ° between two cell walls connected in sequence. It is further preferred that the angle formed between two cell walls connected in sequence is 50-70 °.

Preferably, the width of each cell wall of the cell unit 1 is equal. The provision of the cell units 1 of such a shape facilitates the formation of a core material of high strength and high structural stability. It is conceivable that the width of each cell wall of the cell unit 1 is not equal, and a similar effect can be achieved.

Preferably, as shown in fig. 16 and 20, the core material is formed by stacking a plurality of folded thin plates 5; each layer of bending thin plate 5 is formed by sequentially connecting a plurality of folding units 51 of the same type, each folding unit 51 comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 first type unit walls 11 which are sequentially connected, and the shape of the second plate part is the same as that of 1 second type unit wall 12; the adjacent two bending thin plates 5 are surrounded to form a cell unit 1, and the joint parts between the adjacent two bending thin plates 5 are connected through a connecting structure. The arrangement further creates conditions for the preparation process of the core material with simple and low cost.

Since the shape of the first plate portion is the same as the shape of 2 or more sequentially connected first-type cell walls 11, the first-type cell walls in the formed core material include at least 2 layers of sheet material. Further preferably, the first type of cell wall is formed from a stack of 2 to 5 layers of sheet material.

Specifically, the sheet material 2 is one of aramid paper, aluminum foil, glass fiber cloth, carbon fiber cloth, stainless steel foil, high temperature alloy foil, and kraft paper.

Example 4

This example provides a method of making the zero poisson's ratio core of example 3, comprising the steps of:

As shown in fig. 12, 13 and 14, in the laminated board, a plurality of adhesive lines 4 parallel to each other at equal intervals are arranged between adjacent sheet materials 2 to bond the adjacent sheet materials 2, each adhesive line 4 includes a second sub-adhesive line 42, a first sub-adhesive line 41 and a second sub-adhesive line 42 which are sequentially arranged in the same width direction, and the bonding strength of the second sub-adhesive line 42 is 10% to 80% of the bonding strength of the first sub-adhesive line 41; the adhesive lines 4 on the subsequent sheet material 2 are overlapped on the adhesive lines 4 of the previous sheet material 2 in the same direction and offset manner, and the first sub adhesive lines 41 on the subsequent sheet material are overlapped with the second sub adhesive lines 42 on the previous sheet material, and the second sub adhesive lines 42 on the subsequent sheet material are overlapped with the first sub adhesive lines 41 on the previous sheet material. Among them, one second sub-adhesive bead 42, one first sub-adhesive bead 41 and one second sub-adhesive bead 42 in the adhesive bead 4 shown in fig. 12 and 14 are sequentially arranged in the first width direction ("width direction" is the width direction of the adhesive bead 4), and one second sub-adhesive bead 42, one first sub-adhesive bead 41 and one second sub-adhesive bead 42 in the adhesive bead 4 shown in fig. 13 are sequentially arranged in the second width direction.

Preferably, in the laminate, adjacent sheet materials 2 are completely overlapped, and the plurality of adhesive lines 4 on each layer of sheet material are distributed on the surface of the sheet material 2 where the adhesive lines are located. Thus, the sheet material 2 was effectively utilized to prepare the core material in example 3.

It is further preferred that the first lines of sub-adhesive 41 on the subsequent layer of sheet material fully overlap the second lines of sub-adhesive 42 on the previous layer of sheet material, i.e. that the width of the first lines of sub-adhesive 41 is equal to the width of the second lines of sub-adhesive 42 (as shown in fig. 11). It is further preferred that on the same layer of sheet material, the spacing between adjacent two lines of adhesive 4 is 2 times the width of the lines of sub-adhesive. In this way, it is possible to produce the cell unit 1 in which the lengths of each cell wall in the LW plane are equal.

Preferably, in the present embodiment, stacking a plurality of sheet materials 2 and bonding between adjacent sheet materials 2 includes: a plurality of sheets of sheet material 2 are stacked, and the same face of each layer of sheet material 2 is coated with lines of adhesive 4 to bond between adjacent sheets of material 2, as shown in fig. 12 and 13. Of course, this is only preferred, and it is conceivable to stack a plurality of sheet materials 2, and apply adhesive lines 4 to both sides of the even-numbered sheet materials 2 to bond between the adjacent sheet materials 2, as shown in fig. 14.

And S2, unfolding the laminated plate in the direction perpendicular to the sheet material, and unfolding the unbonded part in the laminated plate to obtain the diamond-shaped cell core material 7. As shown in fig. 15.

And S3, after stabilizing the diamond-shaped cell core material, unfolding the diamond-shaped cell core material 7 in the direction (namely, the W direction) perpendicular to the sheet material, and unfolding the part bonded by the second sub-adhesive lines 42 in the diamond-shaped cell core material 7 to obtain the hyperbolic zero Poisson ratio core material (the hyperbolic meaning that the second type of cell wall 12 has two bends). As shown in fig. 16 and 17.

Preferably, step S3 further comprises: and (3) stabilizing the hyperbolic zero poisson ratio core material. Further preferably, the stabilization of the hyperbolic zero poisson ratio core material includes: performing high-temperature treatment on the hyperbolic zero poisson ratio core material; and/or impregnating the hyperbolic zero poisson's ratio core material with a resin solution and curing the resin.

The resin solution used in the stabilization treatment process of the diamond-shaped lattice core material and the stabilization treatment process of the hyperbolic zero poisson ratio core material is one or more of phenolic resin, polyimide resin, cyanate resin, polyester, bismaleimide resin and epoxy resin.

And S4, sawing and/or slicing the hyperbolic zero poisson ratio core material to obtain a finished core material.

According to the preparation method of the core material with the zero poisson ratio, a plurality of sheet materials 2 are stacked, bonding is carried out between the adjacent sheet materials 2 to form a laminated plate, and then the laminated plate is subjected to two unfolding operations, so that the core material with the hyperbolic zero poisson ratio can be prepared and obtained, the process is simple, the preparation is rapid, mass production can be carried out, and the cost is very low. Moreover, in this embodiment, the adhesive lines 4 composed of the second sub-adhesive lines 42, the first sub-adhesive lines 41 and the second sub-adhesive lines 42, which are sequentially arranged in the same width direction and have different glue coating amounts, are used to bond the adjacent sheet materials 2, and the adhesive lines 42 on the subsequent sheet material 2 are matched to be overlapped on the adhesive lines 41 of the previous sheet material 2 in a staggered manner in the same direction, so that a laminated plate can be prepared, and the hyperbolic zero poisson ratio core material can be prepared through two expansion operations.

The method for preparing the core material with zero poisson ratio in example 3 provided in this example is specifically described below by way of an example, and includes the following steps:

step A1, selecting aramid paper with the thickness of 0.08mm as a sheet material 2; stacking a plurality of aramid papers, coating adhesive lines 4 on the same surface of each layer of aramid paper to bond between adjacent aramid papers, obtaining a plurality of layers of aramid paper, and curing the adhesive to obtain the laminated board in the step S1. As shown in fig. 12.

Wherein, in the laminated board, each adhesive line 4 comprises a second sub-adhesive line 42, a first sub-adhesive line 41 and a second sub-adhesive line 42 which are sequentially arranged along the first width direction, the glue coating amount of the second sub-adhesive line 42 is 50% of the glue coating amount of the first sub-adhesive line 41, the width of the adhesive line 4 is 15mm, and the interval between two adjacent adhesive lines 4 is 10mm.

Wherein the curing treatment of the adhesive comprises: the multi-layered aramid paper is placed in a heated press to provide a bonding effect to the adhesive under conditions of heat and pressure. Specifically, the temperature was set at 180.+ -. 5 ℃, the pressure was set at 0.6 MPa.+ -. 0.05MPa, and the pressing time was set at 180.+ -. 5 minutes.

And A2, expanding the laminated plate in the direction perpendicular to the thin plate material, and expanding unbonded parts in the laminated plate to obtain the diamond-shaped cellular material. As shown in fig. 15.

And A4, expanding the diamond-shaped cell core material 7 subjected to the stabilization treatment in the direction perpendicular to the sheet material, and expanding the bonding part of the second sub-adhesive lines 42 in the diamond-shaped cell core material 7 to obtain the hyperbolic zero poisson ratio core material. As shown in fig. 16 and 17. This showsThe hyperbolic zero poisson ratio core material prepared by the example has the cell wall widths of 5.0mm and the core material density of about 25.4kg/m ³ (1.59lb/ft ³ )。

Example 5

This example provides a method of making the zero poisson's ratio core of example 1 or example 3.

As shown in fig. 19 and 20, the zero poisson ratio core is formed by stacking a plurality of folded sheets 5, each folded sheet 5 is formed by sequentially connecting a plurality of folding units 51 of the same type, the folding units 51 include sequentially connected first plate portions having the same shape as the first-type unit walls 11 of which 2 or more are sequentially connected, and second plate portions having the same shape as the first-type unit walls 12 of which 1 is connected; the adjacent two bending thin plates 5 are surrounded to form a cell unit 1, and the joint parts between the adjacent two bending thin plates 5 are connected through a connecting structure.

Thus, the preparation method of the zero poisson ratio core material provided by the embodiment comprises the following steps:

Step S1, designing the width of each cell wall and the included angle between the adjacent cell walls in the second type cell walls 12, designing the width of the first type cell walls 11, and manufacturing the forming die of the bending sheet 5 according to the design result.

Step S2, selecting a base material of the bending thin plate 5, and pressing the base material in a forming die to form the bending thin plate 5.

Step S3, arranging a connecting structure on a first plate part of the bending thin plate 5, and sequentially arranging a plurality of bending thin plates 5 to form a shape of a core material with zero Poisson ratio; and connecting adjacent bending thin plates 5 through a connecting structure to obtain the core material with zero poisson ratio.

Example 6

This example provides a method of making the zero poisson's ratio core of example 1 or example 3, comprising the steps of:

Example 7

This example provides a method of making the zero poisson's ratio core of example 1 or example 3, comprising the steps of: and printing the core material matrix material on 3D printing equipment according to a pre-designed model diagram to obtain the zero poisson ratio core material.

It should be noted that, in the zero poisson ratio core material according to the embodiment 1 of the present invention, there is one bend in the second type cell wall 12, and in the zero poisson ratio core material according to the embodiment 2, it is only preferable that there are two bends in the second type cell wall 12, and it is conceivable that there are three or more bends in the second type cell wall 12 in the core material structure according to the present invention, and the characteristics of zero poisson ratio can also be provided.

It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and is for enabling those skilled in the art to understand the present invention and implement it accordingly, but the present invention is not limited to the above-described specific embodiments. All changes or modifications that come within the scope of the appended claims are intended to be embraced therein.

Claims

1. A zero Poisson ratio core material is characterized in that,

the core material is formed by arranging a plurality of same type of cell units (1) without gaps;

the cell unit (1) comprises two first type unit walls (11) which are arranged in opposite directions and two second type unit walls (12) which are arranged in opposite directions, wherein the two first type unit walls (11) are connected through the two second type unit walls (12) and jointly surround to form the cell unit (1); the first type cell walls (11) and the second type cell walls (12) are walls common to adjacent cell units;

The first type cell walls (11) are used as one cell wall of the cell unit (1), and the two first type cell walls (11) are arranged in parallel; the second type unit walls (12) at least comprise two cell walls which are connected in sequence, and an included angle is formed between the two cell walls which are connected in sequence in the second type unit walls (12), so that the second type unit walls (12) are of a bending structure.

2. The zero poisson's ratio core material according to claim 1, wherein,

the core material is formed by stacking a plurality of layers of bending thin plates (5);

each layer of bending thin plate (5) is formed by sequentially connecting a plurality of folding units (51) of the same type, each folding unit (51) comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 first type unit walls (11) which are sequentially connected, and the shape of the second plate part is the same as that of 1 second type unit wall (12);

cell units (1) are formed between two adjacent bending thin plates (5) in a surrounding mode, and the joint positions between the two adjacent bending thin plates (5) are connected through a connecting structure.

3. The zero poisson's ratio core material according to claim 1, wherein,

an included angle of 10-180 degrees is formed between two cell walls which are sequentially connected in the second type of cell walls (12).

4. The zero poisson's ratio core material according to claim 3,

When the second type unit walls (12) are more than three cell walls which are connected in sequence, the second type unit walls (12) form a wave-shaped bending structure.

5. The zero poisson's ratio core material according to claim 1, wherein,

the width of each cell wall of the cell unit (1) is equal;

the width of the cell walls of the cell unit (1) is 2-8 mm.

6. The preparation method of the zero poisson ratio core material is characterized in that the preparation method prepares the zero poisson ratio core material with the second type unit wall (12) as two cell walls connected in sequence, and the preparation method comprises the following steps:

step S1, stacking a plurality of sheet materials (2), and bonding between adjacent sheet materials (2) to obtain a laminated plate;

in the obtained laminated board, a plurality of adhesive lines (4) which are parallel to each other at equal intervals are arranged between adjacent sheet materials (2), the adjacent sheet materials (2) are bonded, each adhesive line (4) comprises a first sub-adhesive line (41) and a second sub-adhesive line (42) which are sequentially arranged along the same width direction, and the bonding strength of the second sub-adhesive line (42) is 10% -80% of that of the first sub-adhesive line (41); the bonding agent lines (4) on the back layer of sheet material (2) are overlapped on the bonding agent lines (4) of the front layer of sheet material (2) in the same direction and dislocation mode, and the first sub-bonding agent lines (41) on the back layer of sheet material are overlapped with the second sub-bonding agent lines (42) on the front layer of sheet material;

S2, unfolding the laminated plate in the direction perpendicular to the sheet material, and unfolding unbonded parts in the laminated plate to obtain a diamond-shaped lattice core material;

and S3, after stabilizing the diamond-shaped cell core material, unfolding the diamond-shaped cell core material in the direction perpendicular to the sheet material, and unfolding the part bonded by the second sub-adhesive lines (42) in the diamond-shaped cell core material to obtain the core material with zero poisson ratio.

7. The method of manufacturing a zero poisson's ratio core material according to claim 6, wherein the bonding strength of the second sub-adhesive lines (42) is 10% to 80% of the bonding strength of the first sub-adhesive lines (41), comprising:

regulating the width of the sub-adhesive lines to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines (42) is 10% -80% of the glue spreading amount of the first sub-adhesive lines (41); or,

the sub-adhesive lines are formed by arranging gaps of adhesive block units, and the gap distance between the adhesive block units in the sub-adhesive lines is adjusted to control the glue spreading amount of the sub-adhesive lines so that the glue spreading amount of the second sub-adhesive lines (42) is 10% -80% of the glue spreading amount of the first sub-adhesive lines (41).

8. The method of manufacturing a zero poisson's ratio core according to claim 6, wherein stacking a plurality of sheet materials (2) and bonding between adjacent sheet materials (2) comprises:

Stacking a plurality of sheets of sheet material (2), the same face of each layer of sheet material (2) being coated with lines of adhesive (4) to bond between adjacent sheets of material (2); alternatively, a plurality of sheet materials (2) are stacked, and adhesive lines (4) are coated on both sides of an even number of sheet materials (2) to bond between adjacent sheet materials (2).

9. The method for preparing a zero poisson' S ratio core material according to claim 6, wherein the step S3 further comprises: stabilizing the zero poisson ratio core material;

wherein, stabilize the processing to diamond cell core, include: carrying out high-temperature treatment on the diamond-shaped cell core material; and/or impregnating the diamond-shaped cell core material with a resin solution and curing the resin;

stabilizing the zero poisson ratio core material, comprising: performing high-temperature treatment on the core material with the zero poisson ratio; and/or, impregnating the zero poisson's ratio core material with a resin solution and curing the resin.

10. The preparation method of the zero poisson ratio core material is characterized in that the preparation method prepares the zero poisson ratio core material with the second type unit wall (12) comprising three cell walls connected in sequence, and the preparation method comprises the following steps:

In the obtained laminated plate, a plurality of adhesive lines (4) which are parallel to each other at equal intervals are arranged between adjacent sheet materials (2), the adjacent sheet materials (2) are bonded, each adhesive line (4) comprises a second sub-adhesive line (42), a first sub-adhesive line (41) and a second sub-adhesive line (42) which are sequentially arranged along the same width direction, and the bonding strength of the second sub-adhesive line (42) is 10% -80% of the bonding strength of the first sub-adhesive line (41); the bonding agent lines (4) on the later layer of sheet material (2) are overlapped on the bonding agent lines (4) of the former layer of sheet material (2) in the same direction and in a staggered manner, the first sub-adhesive lines (41) on the later layer of sheet material are overlapped with the second sub-adhesive lines (42) on the former layer of sheet material, and the second sub-adhesive lines (42) on the later layer of sheet material are overlapped with the first sub-adhesive lines (41) on the former layer of sheet material;

11. The method of manufacturing a zero poisson's ratio core material according to claim 10, wherein the bonding strength of the second sub-adhesive lines (42) is 10% to 80% of the bonding strength of the first sub-adhesive lines (41), comprising:

12. The method of manufacturing a zero poisson's ratio core according to claim 10, wherein stacking a plurality of sheet materials (2) and bonding between adjacent sheet materials (2) comprises:

stacking a plurality of sheet materials (2), and coating adhesive lines (4) on the same surface of each layer of sheet materials (2) so as to bond adjacent sheet materials (2); alternatively, a plurality of sheet materials (2) are stacked, and adhesive lines (4) are coated on both sides of an even number of sheet materials (2) to bond between adjacent sheet materials (2).

13. The method for preparing a zero poisson' S ratio core material according to claim 10, wherein the step S3 further comprises: stabilizing the zero poisson ratio core material;

14. The preparation method of the zero poisson ratio core material is characterized in that the zero poisson ratio core material is formed by stacking a plurality of layers of bending thin plates (5), each layer of bending thin plates (5) is formed by sequentially connecting a plurality of folding units (51) of the same type, each folding unit (51) comprises a first plate part and a second plate part which are sequentially connected, the shape of the first plate part is the same as that of more than 2 first type unit walls (11) which are sequentially connected, and the shape of the second plate part is the same as that of 1 second type unit wall (12); the cell units (1) are formed between two adjacent bending thin plates (5) in a surrounding mode, and the joint parts between the two adjacent bending thin plates (5) are connected through a connecting structure;

The preparation method comprises the following steps:

s1, obtaining a plurality of bending thin plates (5);

s2, arranging a connecting structure on a first plate part of the bending thin plate (5), and sequentially arranging a plurality of bending thin plates (5) to form a shape of a core material with zero Poisson ratio; and connecting adjacent bending thin plates (5) through a connecting structure to obtain the core material with zero poisson ratio.

15. The preparation method of the core material with the zero poisson ratio is characterized by comprising the following steps of:

s1, manufacturing a casting mould according to a core material with zero Poisson' S ratio;

16. The preparation method of the core material with the zero poisson ratio is characterized by comprising the following steps of:

and printing the core material matrix material on 3D printing equipment according to a pre-designed model diagram to obtain the zero poisson ratio core material.

17. A composite material comprising a zero poisson's ratio core and a face sheet overlaying the zero poisson's ratio core, the zero poisson's ratio core being the core of any one of claims 1 to 5.