CN111063403A - Novel three-dimensional negative poisson ratio honeycomb structure - Google Patents
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- CN111063403A CN111063403A CN201911274314.XA CN201911274314A CN111063403A CN 111063403 A CN111063403 A CN 111063403A CN 201911274314 A CN201911274314 A CN 201911274314A CN 111063403 A CN111063403 A CN 111063403A
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Abstract
The invention relates to a novel three-dimensional negative Poisson ratio honeycomb structure, which comprises a combined body and connectors, wherein the combined body comprises single bodies and side connectors, the single bodies are concave hexagons, the side connectors are single bodies provided with through grooves, the width of each through groove is the same as that of each single body, the side connectors are fixedly connected to the middles of two side planes of each single body, the connectors are fixedly connected to the single bodies and the side connectors respectively, and the combined bodies of a plurality of groups form a honeycomb shape through the connectors.
Description
Technical Field
The invention relates to the technical field of material structures, in particular to a novel three-dimensional negative poisson ratio honeycomb structure.
Background
With the development of engineering technology, materials with conventional mechanical properties cannot meet the requirement standards of people in some fields, so that negative poisson's ratio materials with special mechanical properties gradually enter the visual field of researchers. As shown in fig. 1, the negative poisson's ratio honeycomb structure (i.e., a structure in which a material expands laterally in an elastic range when being stretched and contracts laterally when being compressed) has excellent properties such as good energy absorption effect, high specific strength and specific stiffness, excellent shock absorption performance, and small relative density, and its high porosity makes it possible to design complex and multifunctional structures.
However, the single cell of the three-dimensional honeycomb structure shown in fig. 1 is composed of six two-dimensional concave hexagonal honeycomb structures, when one-way load is applied, the three two-dimensional concave hexagonal honeycombs mainly providing the load bearing capacity in the direction are three two-dimensional concave hexagonal honeycombs, the structural load bearing utilization efficiency is not high, and the energy absorption capacity is not fully developed and utilized.
Therefore, in view of the above disadvantages, it is desirable to provide a novel three-dimensional negative poisson's ratio honeycomb structure.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is the problem of insufficient utilization efficiency of the bearing structure.
(II) technical scheme
In order to solve the technical problem, the invention provides a novel three-dimensional negative Poisson ratio honeycomb structure which comprises a combination body and connectors, wherein the combination body comprises single bodies and side connectors, the single bodies are concave hexagons, the side connectors are single bodies provided with through grooves, the width of each through groove is the same as that of each single body, the side connectors are fixedly connected to the middles of planes of the two sides of each single body, the connectors are fixedly connected to the single bodies and the side connectors respectively, and a plurality of groups of combination bodies are arrayed into a honeycomb shape through the connectors.
By adopting the technical scheme, the assembly array honeycomb structure with two crossed monomers is adopted, when the structure is subjected to unidirectional bearing, the two monomers of a single assembly cell element provide bearing capacity, the utilization efficiency of the bearing structure is higher, and the energy absorption capacity of the structure can be greatly improved.
As a further illustration of the present invention, it is preferred that the number of layers of the plurality of array of combinations is two.
Through adopting above-mentioned technical scheme, adopt two-layer array distribution, can guarantee that honeycomb has qualified structural strength, and compare the current honeycomb of the same number of piles, its bearing capacity is higher, can reduce the material input again, kills two birds with one stone.
As a further illustration of the invention, it is preferred that the two combinations and the connecting body connecting the two combinations are in one group.
By adopting the technical scheme, when the honeycomb structure is loaded in one direction, two monomers in the three-dimensional negative Poisson's ratio honeycomb structure unit cell formed by the two combined bodies and the connecting body provide bearing capacity, so that the bearing capacity and the energy absorption capacity of the structure can be greatly improved compared with the original three-dimensional negative Poisson's ratio honeycomb structure.
As a further illustration of the present invention, it is preferred that the connector is a cross-shaped square bar, and the ends of the connector are fixedly connected to the single body and the concave ends of the side connectors.
Through adopting above-mentioned technical scheme, usable connector turns into the power of direct directional monomer and side internal concave end with vertical power, makes monomer and side body absorb more energy through elastic deformation, directly improves the energy-absorbing capacity of structure to adopt the cross to connect, still can guarantee to have good joint strength between two combinations.
As a further description of the present invention, it is preferable that the single body is an axisymmetric planar concave hexagon, the length and height of the single body are the same, and the distance between the end points of the single body concave is half of the length of the single body.
By adopting the technical scheme and matching with the characteristics of the material, the unit cell is easier to absorb energy and deform when stressed, the single cell and the side junction can be prevented from being pressed and broken, and the situation that the unit cell can be smoothly restored to the original state after being unloaded can be ensured.
As a further illustration of the invention, it is preferred that the length of the linker is the same as the length of the monomer.
Through adopting above-mentioned technical scheme, make between assembly and the assembly, have reasonable clearance between unit cell and the unit cell, can not only leave the room of deformation for the structure produces elastic deformation, can also guarantee to have good joint strength, avoid appearing the bearing capacity not enough and appear cracked problem in connector department.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
according to the novel three-dimensional negative Poisson ratio honeycomb structure, the two-dimensional concave honeycomb structure is vertically intersected, when longitudinal bearing occurs, two assemblies in a single cell are used as main bearing parts, the structure utilization rate is high, and compared with the original traditional three-dimensional negative Poisson ratio honeycomb structure, the energy absorption effect of the structure is remarkably improved.
Drawings
FIG. 1 is a prior art three-dimensional negative Poisson's ratio honeycomb structure diagram;
FIG. 2 is a three-dimensional negative Poisson's ratio honeycomb structure of the present invention;
FIG. 3 is a diagram of a unit cell structure according to the present invention;
FIG. 4 is a block diagram of a monomer of the present invention;
FIG. 5 is a graph comparing stress strain for the present invention and the prior art;
FIG. 6 is a graph of the stress-strain curve for the present invention cd-4 versus the prior art;
FIG. 7 is a graph of the stress strain at 8 for the present invention versus the prior art;
FIG. 8 is a graph of stress strain for the present invention at 0.8 times wall thickness versus the prior art;
fig. 9 is a graph of stress strain for the present invention at 1.2 times wall thickness versus the prior art.
In the figure: 1. an assembly; 11. a monomer; 12. a side connection body; 2. a connector.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The utility model provides a novel three-dimensional negative poisson ratio honeycomb structure, combines figure 2, figure 3, including assembly 1 and connector 2, two assemblies 1 and connect connector 2 between two assemblies 1 to be a unit cell, a plurality of unit cell, the assembly 1 of a plurality of groups becomes honeycombedly through connector 2 array promptly, when one-way loading, the three-dimensional negative poisson ratio honeycomb structure unit cell of the unit cell that two assemblies 1 and connector 2 constitute all provides bearing capacity, thereby compare with original three-dimensional negative poisson ratio honeycomb structure, can improve the bearing capacity and the energy-absorbing ability of structure greatly.
With reference to fig. 3 and 4, the assembly 1 includes a single body 11 and a side connector 12, the single body 11 is an axially symmetric concave hexagonal prism with a square cross section, for the sake of clear connection, the hexagonal ends of the single body 11 are respectively a, b, c, d, e, and f, wherein the two ends of the concave are c and d, and the intersection points of the longitudinal center line of the single body 11 and the upper and lower rods are respectively g and h, and the length and height of the single body 11 are the same, that is, ab ═ ef ═ ae ═ bf; the spacing between the concave end points of the single bodies 11 is half of the length of the single bodies 11, i.e.
The side connection body 12 is an inwards concave hexagonal prism body which is perpendicular to the single body 11 and is arranged at the gh position, the width of the inwards concave hexagonal prism body is the same as the width of the single body 11, the gh two ends of the side connection body 12 are respectively and correspondingly fixedly connected at the gh ends of planes at the two sides of the single body 11, the characteristics of materials can be matched, the single cell is easier to absorb energy and deform when stressed, the single body 11 and the side connection body 12 can be prevented from being pressed and broken, and the situation that the single cell can be smoothly restored to the.
With reference to fig. 3 and 4, the connector 2 is a cross square rod, the end of the connector 2 is fixedly connected to the concave ends of the single body 11 and the side connector 12, namely, the end is fixedly connected to the c and the d, the length of the connector 2 is the same as that of the single body 11, the connector 2 can be used for converting a longitudinal force into a force directly pointing to the concave ends of the single body 11 and the side connector 12, so that the single body 11 and the side connector 12 absorb more energy through elastic deformation, the energy absorption capability of the structure is directly improved, and the cross connection is adopted, so that the excellent connection strength between the two assemblies 1 can be ensured; set up connector 2 simultaneously and monomer 11 length is the same, make between assembly 1 and the assembly 1, have reasonable clearance between unit cell and the unit cell, not only can leave the room of deformation for the structure produces elastic deformation, can also guarantee to have good joint strength, avoids appearing the bearing capacity not enough and the cracked problem appears in connector department.
With reference to fig. 2 and 3, the number of layers of the plurality of assembly 1 (or single cell) arrays is two, and two-layer array distribution is adopted, so that the honeycomb structure can be guaranteed to have qualified structural strength, and compared with the existing honeycomb structure with the same number of layers, the bearing capacity is higher, the material investment can be reduced, and two purposes are achieved at one stroke.
In order to verify that the design meets the expected effect, a quasi-static compression experiment is carried out on the three-dimensional negative poisson ratio honeycomb structure and the invention in the prior art:
the three-dimensional negative poisson ratio honeycomb structure in the prior art and the three-dimensional negative poisson ratio honeycomb structure in the invention are printed by nylon in a 3D mode, wherein structural parameters of a monomer 11 in the three-dimensional negative poisson ratio honeycomb structure in the prior art are the same as those of the monomer 11 in the three-dimensional poisson ratio honeycomb structure in the invention, namely ab ═ ef ═ ae ═ bf ═ 10mm, cd ═ 5mm, the number of sample layers is two, and the contact areas of the upper end face and the lower end face are the same.
Then, the two are respectively placed on a compressor, and a stress-strain curve is obtained by applying an experimental speed of 2mm/min to the two; the Abaqus finite element analysis software is used for conducting finite element analysis on the Abaqus finite element analysis software and simulating quasi-static compression, wherein structural parameters are unchanged, the quasi-static compression is simulated by setting a loading mode to be smooth step, a first derivative and a second derivative of the loading step are zero, and fluctuation influence in the loading process can be eliminated. The compression distance was 18mm, the loading time was 144ms, and the average loading speed was 0.125 m/s.
FIG. 5 is a graph of experimental and finite element analysis stress-strain curve comparisons for a prior art three-dimensional negative Poisson's ratio honeycomb structure and a three-dimensional negative Poisson's ratio honeycomb structure of the present invention, wherein w represents the three-dimensional negative Poisson's ratio honeycomb structure of the present invention and x represents the prior art three-dimensional negative Poisson's ratio honeycomb structure; w-m represents the result of finite element simulation performed by the present invention, w-s represents the result of actual experiment performed by the tester according to the present invention, x-m represents the result of finite element simulation performed by the prior art, and x-s represents the result of actual experiment performed by the tester.
In order to make the data result of the finite element simulation more fit with the data result of the actual experiment, the thickness parameter is added during the finite element analysis, and the thickness parameter is given the same value as the rod piece section of the single body 11 is square; and in order to compare the mechanical properties of the structure of the invention and the structure of the prior art, the relative density data of the structure and the structure of the prior art are the same, so that the wall thickness of the prior art is selected to be 1, and the wall thickness of the invention is 1.2605.
By analyzing the stress-strain curve diagram, the bearing capacity of the invention is about twice of that of the prior art no matter the result is obtained by finite element analysis or actual experiment.
In order to avoid the occurrence of contingency, the invention also provides analysis data of a plurality of groups of parameter changes, the original cd is changed from 5 to 4, and the other parameters are not changed by combining with the graphs of fig. 4 and fig. 6, at this time, finite element analysis is carried out on the honeycomb structures of the invention and the prior art, and a current stress-strain curve graph is obtained, and the honeycomb structure of the invention has stronger bearing capacity than the honeycomb structure of the prior art even if the size among pits changes by comparison.
With reference to fig. 4 and 7, the original ae ═ bf ═ gh ═ 10 is changed into ae ═ bf ═ gh ═ 8, and the rest parameters are not changed, at this time, finite element analysis is performed on both the honeycomb structures of the present invention and the prior art, and a current stress-strain curve graph is obtained.
With reference to fig. 4 and 8, when the wall thickness is 0.8 times of the original wall thickness and the other parameters are not changed, it is known through comparison that even if the wall thickness is reduced, the load-bearing capacity of the honeycomb structure of the present invention is still higher than that of the honeycomb structure of the prior art.
With reference to fig. 4 and 9, when the wall thickness is 1.2 times of the original wall thickness and the other parameters are not changed, it is known through comparison that even if the wall thickness is increased, the load-bearing capacity of the honeycomb structure of the present invention is still higher than that of the honeycomb structure of the prior art.
In summary, the invention adopts the combined body array honeycomb structure with two approximately crossed monomers, and the two combined bodies of a single cell element provide bearing capacity, so that compared with the original traditional three-dimensional negative poisson ratio honeycomb structure, the structure utilization rate is higher, the bearing structure utilization efficiency is higher, and the energy absorption capacity of the structure can be greatly improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A novel three-dimensional negative Poisson ratio honeycomb structure is characterized in that: including assembly (1) and connector (2), assembly (1) is including monomer (11) and side connector (12), and monomer (11) are indent hexagon, and side connector (12) is for having opened the monomer that leads to the groove, it is the same with monomer (11) width to lead to the groove width, and side connector (12) links firmly at monomer (11) both sides plane middle part, and connector (2) links firmly respectively on monomer (11) and side connector (12), and the assembly (1) of a plurality of groups is arrayed into honeycombedly through connector (2).
2. The novel three-dimensional negative poisson's ratio honeycomb structure of claim 1, wherein: the number of layers of the plurality of combination (1) arrays is two.
3. The novel three-dimensional negative poisson's ratio honeycomb structure of claim 2, wherein: the two combined bodies (1) and the connecting body (2) connecting the two combined bodies (1) form a group.
4. The novel three-dimensional negative poisson's ratio honeycomb structure of claim 3, wherein: the connector (2) is a cross square rod, and the end of the connector (2) is fixedly connected with the single body (11) and the concave end of the side connector (12).
5. The novel three-dimensional negative poisson's ratio honeycomb structure of claim 1, wherein: the single body (1) is an axisymmetric plane concave hexagon, the length and the height of the single body (1) are the same, and the distance between the concave end points of the single body (1) is one half of the length of the single body (1).
6. The novel three-dimensional negative poisson's ratio honeycomb structure of claim 5, wherein: the length of the connecting body (2) is the same as that of the monomer (1).
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Cited By (9)
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| CN113808684A (en) * | 2020-06-16 | 2021-12-17 | 湖南大学 | Three-dimensional metamaterial structure with thermal expansion and Poisson's ratio capable of being regulated and controlled simultaneously and design method and application thereof |
| CN113968197A (en) * | 2021-12-09 | 2022-01-25 | 广州大学 | Three-dimensional negative Poisson ratio hourglass-shaped structure and honeycomb combined structure based on same |
| CN114013027A (en) * | 2021-11-04 | 2022-02-08 | 西南大学 | Construction method of strong-stability negative Poisson ratio structure |
| CN114748214A (en) * | 2022-03-14 | 2022-07-15 | 华中科技大学 | Negative Poisson ratio three-dimensional composite structure unit cell for bone implantation and bone fixation implant |
| CN114832359A (en) * | 2022-01-17 | 2022-08-02 | 大连理工大学 | Negative Poisson ratio skiing sport protector suitable for two seasons of summer and winter under multiple scenes |
| CN115596793A (en) * | 2022-09-13 | 2023-01-13 | 武汉科技大学（Cn） | Negative Poisson's ratio honeycomb metamaterial with multi-step deformation effect |
| CN116920169A (en) * | 2023-07-19 | 2023-10-24 | 北京科技大学 | Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof |
| CN117325513A (en) * | 2023-11-07 | 2024-01-02 | 昆明理工大学 | Three-dimensional honeycomb sandwich panel based on parallel negative poisson ratio |
| CN115596793B (en) * | 2022-09-13 | 2024-05-17 | 武汉科技大学 | Negative poisson ratio honeycomb metamaterial with multi-step deformation effect |
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Cited By (14)
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| CN113808684A (en) * | 2020-06-16 | 2021-12-17 | 湖南大学 | Three-dimensional metamaterial structure with thermal expansion and Poisson's ratio capable of being regulated and controlled simultaneously and design method and application thereof |
| CN114013027A (en) * | 2021-11-04 | 2022-02-08 | 西南大学 | Construction method of strong-stability negative Poisson ratio structure |
| CN114013027B (en) * | 2021-11-04 | 2024-03-15 | 西南大学 | Construction method of strong-stability negative poisson ratio structure |
| CN113968197A (en) * | 2021-12-09 | 2022-01-25 | 广州大学 | Three-dimensional negative Poisson ratio hourglass-shaped structure and honeycomb combined structure based on same |
| CN113968197B (en) * | 2021-12-09 | 2023-08-08 | 广州大学 | Three-dimensional negative poisson ratio hourglass structure and honeycomb combined structure based on same |
| CN114832359B (en) * | 2022-01-17 | 2023-09-19 | 大连理工大学 | Negative poisson ratio skiing sports protective equipment suitable for multi-scene in summer and winter |
| CN114832359A (en) * | 2022-01-17 | 2022-08-02 | 大连理工大学 | Negative Poisson ratio skiing sport protector suitable for two seasons of summer and winter under multiple scenes |
| CN114748214A (en) * | 2022-03-14 | 2022-07-15 | 华中科技大学 | Negative Poisson ratio three-dimensional composite structure unit cell for bone implantation and bone fixation implant |
| CN114748214B (en) * | 2022-03-14 | 2023-08-18 | 华中科技大学 | Negative poisson ratio three-dimensional composite structural unit for bone implantation and bone fixation implant |
| CN115596793A (en) * | 2022-09-13 | 2023-01-13 | 武汉科技大学（Cn） | Negative Poisson's ratio honeycomb metamaterial with multi-step deformation effect |
| CN115596793B (en) * | 2022-09-13 | 2024-05-17 | 武汉科技大学 | Negative poisson ratio honeycomb metamaterial with multi-step deformation effect |
| CN116920169A (en) * | 2023-07-19 | 2023-10-24 | 北京科技大学 | Three-dimensional negative poisson ratio metamaterial unit cell and array structure and manufacturing method thereof |
| CN117325513A (en) * | 2023-11-07 | 2024-01-02 | 昆明理工大学 | Three-dimensional honeycomb sandwich panel based on parallel negative poisson ratio |
| CN117325513B (en) * | 2023-11-07 | 2024-04-09 | 昆明理工大学 | Three-dimensional honeycomb sandwich panel based on parallel negative poisson ratio |
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