CN115419670A - X-type negative Poisson's ratio honeycomb structure - Google Patents
X-type negative Poisson's ratio honeycomb structure Download PDFInfo
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- CN115419670A CN115419670A CN202210869555.4A CN202210869555A CN115419670A CN 115419670 A CN115419670 A CN 115419670A CN 202210869555 A CN202210869555 A CN 202210869555A CN 115419670 A CN115419670 A CN 115419670A
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- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims abstract description 5
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/121—Vibration-dampers; Shock-absorbers using plastic deformation of members the members having a cellular, e.g. honeycomb, structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/128—Vibration-dampers; Shock-absorbers using plastic deformation of members characterised by the members, e.g. a flat strap, yielding through stretching, pulling apart
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0225—Cellular, e.g. microcellular foam
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Abstract
The invention relates to an X-type negative Poisson ratio honeycomb structure which comprises a plurality of X-shaped unit cells which are periodically arranged in the same plane, wherein gaps do not exist between the left X-shaped unit cells and the right X-shaped unit cells which are adjacent, and rhombic gaps are formed between the upper X-shaped unit cells and the lower X-shaped unit cells which are adjacent; the X-shaped unit cell comprises four horizontal cell walls, four long inclined cell walls and four short inclined cell walls, every two long inclined cell walls are connected with each other to form an inwards concave arrow structure and are symmetrically distributed on the left side and the right side of the X-shaped unit cell, every two short inclined cell walls are connected with each other to form an inwards concave bending structure and are symmetrically distributed on the upper side and the lower side of the X-shaped unit cell, and two ends of each horizontal cell wall are respectively connected with the top ends or the bottom ends of the long inclined cell walls and the short inclined cell walls on the same side. The invention has obvious negative Poisson ratio effect when loading in the vertical direction and the horizontal direction, and compared with the traditional concave hexagonal honeycomb structure, the deformation stability, platform stress and energy absorption performance of the structure are improved.
Description
Technical Field
The invention relates to the technical field of mechanical metamaterial design, in particular to an X-shaped negative Poisson's ratio honeycomb structure.
Background
The honeycomb structure is used as a typical bionic structure, and is often made into a sandwich structure as a load-bearing or secondary load-bearing structure to be applied to the fields of aerospace, transportation and the like due to higher out-of-plane rigidity, lighter mass and excellent mechanical property designability. According to the difference of poisson ratio characteristics, the honeycomb structure can be divided into a positive poisson ratio honeycomb structure, a zero poisson ratio honeycomb structure and a negative poisson ratio honeycomb structure.
For conventional materials, transverse contraction (expansion) is exhibited when subjected to axial tension (compression), whereas negative poisson's ratio materials exhibit the opposite, transverse expansion (contraction) when subjected to axial tension (compression). The abnormal mechanical property enables the negative Poisson ratio honeycomb structure to have unique mechanical properties including enhanced shearing resistance, indentation resistance, impact resistance, collision resistance, energy absorption capacity and the like, and the negative Poisson ratio honeycomb structure has wide application prospects in the fields of automobiles, aerospace, packaging and the like.
The overall mechanical performance of the negative poisson ratio honeycomb structure is highly dependent on the unit cell structure of the negative poisson ratio honeycomb structure; under load, different unit cell structures have a significant influence on the mechanics of action. The common conventional negative poisson's ratio unit cell structure mainly comprises: double arrow head structures, concave hexagonal structures, star structures, chiral/anti-chiral structures, and the like.
With the development of additive manufacturing technology, the preparation problem of the negative poisson ratio honeycomb structure with a complex structure is effectively solved. At present, researchers have proposed a plurality of novel single-cell structures, but the honeycomb formed by some single-cell structures only has the negative poisson ratio effect when loaded in one direction, has no negative poisson ratio effect or has no obvious effect when loaded in the other direction, has the problems of weak energy absorption capacity and the like, and the mechanical property of the honeycomb cannot meet the application requirement of actual engineering.
Therefore, a new unit cell structure is designed, the negative Poisson ratio effect in two directions is realized, the structural stability is enhanced, and the platform stress and the energy absorption capacity are improved, so that the method has important significance.
Disclosure of Invention
The invention aims to solve the technical problem that an X-type negative Poisson's ratio honeycomb structure is provided, the X-type negative Poisson's ratio honeycomb structure has obvious negative Poisson's ratio effect when being loaded in the vertical direction and the horizontal direction, and compared with the traditional concave hexagonal honeycomb structure, the X-type negative Poisson's ratio honeycomb structure increases the deformation stability, the platform stress and the energy absorption performance of the structure.
In order to solve the technical problems, the invention adopts the following technical scheme:
an X-type negative Poisson ratio honeycomb structure comprises a plurality of X-shaped unit cells which are periodically arranged in the same plane, wherein gaps do not exist between the left X-shaped unit cell and the right X-shaped unit cell which are adjacent, and rhombic gaps are formed between the upper X-shaped unit cell and the lower X-shaped unit cell which are adjacent;
the X-shaped unit cell comprises four horizontal cell walls, four long inclined cell walls and four short inclined cell walls, every two long inclined cell walls are connected with each other to form an inwards concave arrow structure and are symmetrically distributed on the left side and the right side of the X-shaped unit cell, every two short inclined cell walls are connected with each other to form an inwards concave bending structure and are symmetrically distributed on the upper side and the lower side of the X-shaped unit cell, two ends of each horizontal cell wall are respectively connected with the top ends or the bottom ends of the long inclined cell walls and the short inclined cell walls on the same side, and an X-shaped closed area is formed in the center of the X-shaped unit cell.
Furthermore, two X-shaped unit cells which are adjacent up and down share two horizontal cell walls, and two X-shaped unit cells which are adjacent left and right share one long inclined cell wall.
Further, the length of the horizontal cell walls is less than the length of the long inclined cell walls.
Furthermore, the vertex angles of the two concave arrow structures which are symmetrical left and right are not contacted, and the vertex angles of the two concave bending structures which are symmetrical up and down are not contacted.
Further, the wall thickness of each of the horizontal cell wall and the long inclined cell wall is half of that of the short inclined cell wall.
Further, the cross sections of the horizontal cell walls, the long inclined cell walls and the short inclined cell walls are all rectangular.
Further, the X-shaped unit cell is made of stainless steel, nylon or aluminum alloy.
Further, the X-type negative Poisson ratio honeycomb structure is prepared by a 3D printing technology.
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:
when the X-type negative Poisson ratio honeycomb structure is compressed in the vertical direction in a plane, obvious transverse shrinkage deformation can occur, the characteristic of negative Poisson ratio is presented, long inclined cell walls of X-shaped single cells rotate and gather inwards along with the compression, and concave bent structures of two adjacent X-shaped single cells up and down are combined to form a diamond structure, so that two obvious platform stress stages can occur when the X-type negative Poisson ratio honeycomb structure is compressed in the vertical direction, and the deformation presents obvious stability; when the X-type negative Poisson's ratio honeycomb structure is compressed in the horizontal direction in a plane, longitudinal shrinkage deformation can also occur, but the compression in the vertical direction is different from the compression in the vertical direction, and the two platform stress stages are not obvious, but the stress enhancement stage is shown;
the X-type negative Poisson ratio honeycomb structure has obvious negative Poisson ratio effect when being compressed in the vertical direction and the horizontal direction, improves the shock resistance and the energy absorption performance of the structure compared with the conventional negative Poisson ratio structure, and can be applied to the fields of aerospace, protective equipment, automobiles, national defense engineering and the like.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic plan view of an X-type negative Poisson's ratio honeycomb structure of the present invention;
FIG. 2 is a schematic plan view of the X-shaped unit cell structure of the present invention;
FIG. 3 is a schematic plan view of an X-shaped unit cell structure according to an embodiment of the present invention;
FIG. 4 is a parameter diagram of X-shaped unit cells according to the present invention;
FIG. 5 is a schematic view of the vertical direction finite element loading of the present invention;
FIG. 6 is a schematic diagram of finite element loading in the horizontal direction according to the present invention;
FIG. 7 is a diagram of a numerical simulation of the deformation process (sequential a → f) of an X-type negative Poisson's ratio honeycomb structure of the present invention when compressed in the vertical direction;
FIG. 8 is a diagram of the deformation process of the X-type negative Poisson's ratio honeycomb structure when compressed in the horizontal direction (the sequence is from a → f in order);
FIG. 9 is a graph of nominal stress-strain curves under vertical compressive loading for an X-type negative Poisson's ratio honeycomb and a conventional concave hexagonal honeycomb under the same parameters;
fig. 10 is a graph of nominal stress-strain curves under compressive horizontal loading for an X-type negative poisson's ratio honeycomb and a conventional concave hexagonal honeycomb under the same parameters.
In the drawings, the components represented by the respective reference numerals are listed below:
1. x-shaped unit cell; 11. a horizontal cell wall; 111. a first horizontal cell wall; 112. a second horizontal cell wall; 113. a third horizontal cell wall; 114. a fourth horizontal cell wall; 12. a long inclined cell wall; 121. a first long inclined cell wall; 122. a second long inclined cell wall; 123. a third long inclined cell wall; 124. a fourth long inclined cell wall; 13. a short inclined cell wall; 131. a first short inclined cell wall; 132. a second short inclined cell wall; 133. a third short inclined cell wall; 134. the fourth short inclined cell wall.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and fig. 2, an X-type negative poisson ratio honeycomb structure comprises a plurality of X-shaped unit cells 1 which are periodically arranged in the same plane, wherein no gap exists between the left and right adjacent X-shaped unit cells 1, and rhombic gaps are formed between the upper and lower adjacent X-shaped unit cells 1;
the X-shaped unit cell 1 comprises four horizontal cell walls 11, four long inclined cell walls 12 and four short inclined cell walls 13, every two long inclined cell walls 12 are connected with each other to form an inwards concave arrow structure and are symmetrically distributed on the left side and the right side of the X-shaped unit cell 1, every two short inclined cell walls 13 are connected with each other to form an inwards concave bending structure and are symmetrically distributed on the upper side and the lower side of the X-shaped unit cell 1, two ends of each horizontal cell wall 11 are respectively connected with the top ends or the bottom ends of the long inclined cell walls 12 and the short inclined cell walls 13 on the same side, and the center of the X-shaped unit cell 1 forms an X-shaped closed area, so that an up-down and left-right symmetrical closed structure with up-down slots and left-right sides inwards concave closed structures is formed.
As shown in fig. 1, two X-shaped cells 1 adjacent to each other up and down share two horizontal cell walls 11, and two X-shaped cells 1 adjacent to each other left and right share one long inclined cell wall 12, as an embodiment.
The unit cells are combined in a copy movement mode to ensure that each unit cell has the same structure and size. The whole size of the honeycomb structure can be adjusted by the length and height of the unit cell and the number of the periodic arrangement so as to adapt to different engineering application requirements.
As an embodiment, the length L of the horizontal cell wall 11 3 Less than the length L of the long inclined cell wall 12 1 。
As an implementation mode, the vertex angles of the two concave arrow structures which are symmetrical left and right are not contacted, and the vertex angles of the two concave bending structures which are symmetrical up and down are not contacted.
In one embodiment, the thickness of each of the horizontal cell walls 11 and the long inclined cell walls 12 is half the thickness t of the short inclined cell wall 13.
In one embodiment, the horizontal cell walls 11, the long inclined cell walls 12 and the short inclined cell walls 13 are all rectangular in cross section.
As shown in FIG. 4, the long inclined cell walls 12 have a length L 1 ，L 1 From height H 0 Together with the angle alpha, the short inclined cell wall 13 has a length L 2 ，L 2 From the length L 0 Angle beta and length L of the horizontal cell wall 3 Determination of L 1 And L 2 The calculation formula of (c) is:
in this example, the specific dimensions of the X-shaped unit cell are: l is 1 ＝8mm，L 2 ＝5mm，L 3 ＝4mm，α＝60°，β＝60°，t＝1mm。
In one embodiment, the X-shaped unit cell 1 is made of stainless steel, nylon or an aluminum alloy.
In the present embodiment, as shown in fig. 3, the horizontal cell wall 11 includes a first horizontal cell wall 111, a second horizontal cell wall 112, a third horizontal cell wall 113, and a fourth horizontal cell wall 114, the long inclined cell wall 12 includes a first long inclined cell wall 121, a second long inclined cell wall 122, a third long inclined cell wall 123, and a fourth long inclined cell wall 124, and the short inclined cell wall 13 includes a first short inclined cell wall 131, a second short inclined cell wall 132, a third short inclined cell wall 133, and a fourth short inclined cell wall 134;
the first long inclined cell wall 121 and the third long inclined cell wall 123 are arranged on the left side of the X-shaped unit cell 1, the bottom end of the first long inclined cell wall 121 is connected with the top end of the third long inclined cell wall 123, the first long inclined cell wall 121 and the third long inclined cell wall 123 are combined to form a ">" shaped concave arrow structure, the second long inclined cell wall 122 and the fourth long inclined cell wall 124 are arranged on the right side of the X-shaped unit cell 1, the bottom end of the second long inclined cell wall 122 is connected with the top end of the fourth long inclined cell wall 124, the second long inclined cell wall 122 and the fourth long inclined cell wall 124 are combined to form a "<" shaped concave arrow structure, and the ">" shaped concave arrow structure and the "<" shaped concave arrow structure are symmetrical to each other on the left and right;
the first short inclined cell wall 131 and the second short inclined cell wall 132 are arranged on the upper side of the X-shaped unit cell 1, the bottom end of the first short inclined cell wall 131 is connected with the bottom end of the second short inclined cell wall 132, the first short inclined cell wall 131 and the second short inclined cell wall 132 are combined to form a V-shaped inwards concave bent structure, the third short inclined cell wall 133 and the fourth short inclined cell wall 134 are arranged on the lower side of the X-shaped unit cell 1, the top end of the third short inclined cell wall 133 is connected with the top end of the fourth short inclined cell wall 134, the third short inclined cell wall 133 and the fourth short inclined cell wall 134 are combined to form an inverted V-shaped inwards concave bent structure, and the V-shaped inwards concave bent structure and the inverted V-shaped inwards concave bent structure are vertically symmetrical;
the left and right ends of the first horizontal cell wall 111 are connected to the top end of the first long inclined cell wall 121 and the top end of the first short inclined cell wall 131, the left and right ends of the second horizontal cell wall 112 are connected to the top end of the second short inclined cell wall 132 and the top end of the second long inclined cell wall 122, the left and right ends of the third horizontal cell wall 113 are connected to the bottom end of the third long inclined cell wall 123 and the bottom end of the third short inclined cell wall 133, the left and right ends of the fourth horizontal cell wall 114 are connected to the bottom end of the fourth short inclined cell wall 134 and the bottom end of the fourth long inclined cell wall 124, the first horizontal cell wall 111 and the second horizontal cell wall 112 are in the same horizontal plane, and the third horizontal cell wall 113 and the fourth horizontal cell wall 114 are in the same horizontal plane.
In order to compare the energy absorption characteristics of the X-shaped honeycomb structure, a traditional concave hexagonal honeycomb structure is selected for comparison. The numerical simulation calculation is carried out by ABAQUS/Explicit nonlinear dynamic Explicit analysis finite element software. The honeycomb test piece is placed between two rigid plates. The honeycomb material is stainless steel, an ideal elastic-plastic material model is adopted, the out-of-plane thickness along the z-axis direction is 5mm, and rigid plates are defined as rigid bodies. In the calculation process, an S4R shell unit is selected as a honeycomb structure, and 5 integration points are defined along the thickness direction in order to ensure the calculation accuracy and the convergence. And finally determining the grid size to be 0.8mm through multiple trial calculation and sensitivity analysis. The whole model adopts a general contact algorithm, and the friction coefficient is 0.2.
In order to ensure that the finite element simulation of the X-shaped honeycomb structure is not affected by the size effect, as shown in FIG. 5, the unit cell numbers in the vertical and horizontal directions are 6 and 11 respectively when the load is applied in the vertical direction; as shown in fig. 6, the unit cell numbers in the vertical and horizontal directions are 7 and 9, respectively, when loaded in the horizontal direction.
As shown in fig. 7, the deformation process of the X-shaped honeycomb structure is mainly divided into two stages when subjected to a vertical load; a first deformation phase: when the strain exceeds the elastic stage, the long inclined cell walls of the X-shaped honeycomb structure are rotated and gathered inwards to present a remarkable X-shaped deformation zone, and the deformation zone is gradually increased and extends to a fixed end and an impact end along with the compression, so that the structure is subjected to transverse contraction deformation, and the honeycomb presents a remarkable negative Poisson ratio effect. The rhomboid structure is not obviously changed in the process of the rotational deformation of the long inclined cell wall. And a second deformation stage: after the vertex angles of the concave arrow structures on the left side and the right side of all the X-shaped unit cell structures are contacted with the vertex angles of the concave bending structures on the upper side and the lower side, the short inclined cell walls forming the diamond structures are contacted and extruded with each other along with the compression, the local densification is generated at the left end, the right end and the honeycomb middle part close to the impact end and the fixed end, then a V-shaped densification belt is presented, and the densification belt gradually expands towards the fixed end.
As shown in fig. 8, the deformation process of the X-shaped honeycomb structure is also divided into two stages when subjected to a horizontal load; the first deformation stage is similar to the structure change phenomenon in the vertical direction compression, except that no obvious X-shaped deformation belt appears, the contraction deformation of the whole structure is shown, and the honeycomb presents an obvious negative Poisson ratio effect. When the long inclined cell walls of some cells are not completely subjected to rotational deformation, the diamond structures close to the impact end and the fixed end are obviously changed, the short inclined cell walls are mutually contacted and extruded to form an I-shaped deformation band, the I-shaped deformation band diffuses towards the middle part along with the compression until all the diamond structures are yielded, and finally the structure is densified.
As shown in fig. 9 and 10, nominal stress-strain curves are shown for the inventive honeycomb structure and the conventional concave hexagonal honeycomb structure under compressive loads in the vertical and horizontal directions at a loading speed of 0.25m/s. As can be seen from fig. 9, the nominal stress-strain curve of the honeycomb structure of the present invention has two plateau stress phases when subjected to a vertical load, the first plateau phase: the long inclined cell wall of the X-shaped structure is rotationally deformed, and the second flat step section: the rhombic structures formed by the concave bending structures of the two adjacent cells yield under the action of in-plane compressive load. As shown in fig. 10, the nominal stress-strain curve of the honeycomb of the present invention when subjected to a horizontal load exhibits a stress intensification phase: when the long inclined cell walls of some cells are not completely deformed in a rotating way, the rhomboid structures close to the impact end and the fixed end are obviously changed.
Compared with the traditional concave hexagonal honeycomb structure, the structure has two stress platform stages in the vertical direction compression process, the platform stress is larger, the stress enhancement stage is realized in the horizontal direction compression process, the energy absorption performance of the structure is obviously enhanced, the deformation is stable, and the impact resistance of the structure is greatly improved.
By adjusting the concave angles alpha and beta of the cell and the horizontal cell wall length L 3 The thickness t can be adjusted to obtain a wide range of Young's modulus and Poisson's ratio, and the in-plane performance of the cell can be adjusted.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (7)
1. An X-type negative Poisson's ratio honeycomb structure is characterized by comprising a plurality of X-shaped unit cells (1) which are periodically arranged in the same plane, wherein gaps do not exist between the left X-shaped unit cells (1) and the right X-shaped unit cells (1) which are adjacent to each other, and rhombic gaps are formed between the upper X-shaped unit cells (1) and the lower X-shaped unit cells (1) which are adjacent to each other;
the X-shaped unit cell (1) comprises four horizontal cell walls (11), four long inclined cell walls (12) and four short inclined cell walls (13), every two long inclined cell walls (12) are connected with each other to form an inwards concave arrow structure and are symmetrically distributed on the left side and the right side of the X-shaped unit cell (1), every two short inclined cell walls (13) are connected with each other to form an inwards concave bending structure and are symmetrically distributed on the upper side and the lower side of the X-shaped unit cell (1), two ends of the horizontal cell walls (11) are connected with the top ends or the bottom ends of the long inclined cell walls (12) and the short inclined cell walls (13) on the same side respectively, and an X-shaped closed area is formed in the center of the X-shaped unit cell (1).
2. The negative Poisson ratio honeycomb structure of claim 1, wherein two X-shaped unit cells (1) adjacent up and down share two horizontal cell walls (11), and two X-shaped unit cells (1) adjacent left and right share one long inclined cell wall (12).
3. The X-type negative poisson's ratio honeycomb structure according to claim 1, characterised in that the length of the horizontal cell walls (11) is less than the length of the long inclined cell walls (12).
4. The X-type negative poisson's ratio honeycomb structure of claim 1, wherein the top corners of the two concave arrow structures that are left-right symmetric do not touch and the top corners of the two concave bent structures that are up-down symmetric do not touch.
5. The X-type negative poisson's ratio honeycomb structure according to claim 1, characterised in that the wall thickness of the horizontal cell walls (11) and the long inclined cell walls (12) are each half the wall thickness of the short inclined cell walls (13).
6. The X-type negative poisson's ratio honeycomb structure according to claim 1, characterized in that the horizontal cell walls (11), the long inclined cell walls (12) and the short inclined cell walls (13) are all rectangular in cross-section.
7. The X-type negative poisson's ratio honeycomb structure according to claim 1, characterised in that the X-shaped unit cell (1) is made of stainless steel, nylon or aluminium alloy.
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