CN219734044U - Negative poisson ratio metamaterial structure based on metal rubber - Google Patents
Negative poisson ratio metamaterial structure based on metal rubber Download PDFInfo
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- CN219734044U CN219734044U CN202320114406.7U CN202320114406U CN219734044U CN 219734044 U CN219734044 U CN 219734044U CN 202320114406 U CN202320114406 U CN 202320114406U CN 219734044 U CN219734044 U CN 219734044U
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- 229920001967 Metal rubber Polymers 0.000 title claims abstract description 81
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 238000005452 bending Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 7
- 238000013016 damping Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
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- 239000000463 material Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
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- 238000005381 potential energy Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
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- 239000004033 plastic Substances 0.000 description 2
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- 239000007790 solid phase Substances 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 230000007123 defense Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
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- Bridges Or Land Bridges (AREA)
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Abstract
The utility model relates to a metal rubber-based negative poisson ratio metamaterial structure, which is formed by periodically extending metamaterial structure cells along an x-axis direction and a y-axis direction, wherein each metamaterial structure cell comprises 4 metal rubber blocks which are arranged in a 2X 2 array mode, the middle of each 4 metal rubber blocks in each metamaterial structure cell is enclosed into a diamond structure, a mandrel is arranged in the center of each metal rubber block in a penetrating manner, two ends of the mandrel are connected with connecting pieces, four jacks distributed in a cross manner are arranged on the side parts of the connecting pieces, and the axes of the four jacks of the connecting pieces are parallel to the diagonal line of the end face of each metal rubber block; the connecting pieces of the two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected through an elastic curved beam, and the end parts of the elastic curved beam are inserted into insertion holes of the connecting pieces. The negative poisson ratio metamaterial structure has excellent repeatable impact resistance, vibration reduction and mechanical bearing performance, stronger adaptability to extreme environments (high temperature, high pressure, corrosion and radiation) and excellent friction damping characteristics.
Description
Technical Field
The utility model relates to the field of mechanics and mechanical engineering, in particular to a negative poisson ratio metamaterial structure based on metal rubber.
Background
Negative poisson's ratio materials and structures have different mechanical properties than traditional materials, which expand laterally in the elastic range when stretched; while the transverse direction of the material instead contracts when compressed. Negative poisson's ratio materials have advantages over traditional positive poisson's ratio materials in many respects, including energy absorption, elastic and shear modulus, indentation resistance, and the like. Because of the special mechanical properties, the material with the negative poisson ratio has important significance in daily necessities and has great potential value for aviation, national defense and automobile industry. In recent years, scientific researchers develop a large number of artificial negative poisson ratio metamaterials on the basis of abstracting and evolving the microstructure of the natural negative poisson ratio materials, and the problems of poor impact resistance, insufficient bearing capacity, intolerance to extreme environments and the like still exist.
Disclosure of Invention
In view of the above, the utility model aims to provide a metal rubber-based negative poisson ratio metamaterial structure which has excellent repeatable impact resistance, vibration reduction and mechanical bearing performance and has stronger extreme environment adaptability.
The utility model is realized by adopting the following scheme: the negative poisson ratio metamaterial structure based on the metal rubber is formed by periodically extending metamaterial structure cells along the x-axis direction and the y-axis direction, wherein each metamaterial structure cell comprises 4 metal rubber blocks which are arranged in a 2X 2 array mode, the middle parts of the 4 metal rubber blocks in each metamaterial structure cell are enclosed to form a diamond structure, a mandrel is arranged in the center of each metal rubber block in a penetrating mode, two ends of the mandrel are connected with connecting pieces, four jacks which are distributed in a cross mode are arranged on the side parts of the connecting pieces, and the axes of the four jacks of the connecting pieces are parallel to the diagonal lines of the end faces of the metal rubber blocks; the connecting pieces of the two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected through an elastic curved beam, and the end parts of the elastic curved beam are inserted into insertion holes of the connecting pieces.
Further, the cross section of the metal rubber block is square, and vertical edges of two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected together.
Further, each row of elastic curved beams in the x-axis direction is connected through a connecting piece to form a wavy structure, each column of elastic curved beams in the y-axis direction is also connected through a connecting piece to form a wavy structure, and the bending directions of two adjacent rows or two adjacent columns of two elastic curved beams with opposite positions are opposite.
Compared with the prior art, the utility model has the following beneficial effects:
(1) When the material is loaded, the material can generate local torsion and overall shrinkage deformation, the material generates a negative poisson ratio effect, after the material is subjected to impact load, the frame absorbs a part of energy, the deformation of the frame is continuously increased, so that the metal rubber becomes a main bearing element, the damping characteristic is enhanced, and the effects of pit impact and vibration reduction are achieved; meanwhile, due to the limiting protection effect of the metal rubber, the frame is always kept in an elastic range, and after external load is unloaded, the material releases elastic potential energy to recover to an initial state, so that the frame has excellent repeatable impact resistance, vibration reduction and mechanical bearing performance;
(2) The metal rubber is used as a base material, has stronger extreme environment (high temperature, high pressure, corrosion and radiation) adaptability and excellent friction damping characteristics compared with the traditional rubber or metal negative poisson ratio material, and has higher designability in combination of the metal rubber and the elastic curved beam.
The present utility model will be further described in detail below with reference to specific embodiments and associated drawings for the purpose of making the objects, technical solutions and advantages of the present utility model more apparent.
Drawings
FIG. 1 is a schematic view of a construction of an embodiment of the present utility model;
FIG. 2 is a perspective view of a metamaterial structure cell structure in accordance with an embodiment of the present utility model;
FIG. 3 is a perspective view of a metal rubber block construction in an embodiment of the present utility model;
FIG. 4 is a cross-sectional view of a metal rubber block in an embodiment of the utility model;
FIG. 5 is a diagram showing a deformation mode under load of a metamaterial structure cell in accordance with an embodiment of the present utility model;
FIG. 6 is a schematic view of a second embodiment of the present utility model;
FIG. 7 is a schematic diagram of a loaded deformation of a second embodiment of the present utility model;
FIG. 8 is a schematic view of a third construction of an embodiment of the present utility model;
the reference numerals in the figures illustrate: 1-metal rubber block, 2-elastic curved beam, 3-connecting piece and 4-core shaft.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiment one: as shown in fig. 1-5, a metamaterial structure with negative poisson ratio based on metal rubber is formed by periodically extending metamaterial structure cells along an x-axis direction and a y-axis direction, the metamaterial structure cells comprise 4 metal rubber blocks 1 which are arranged in a 2×2 array mode, the centers of the 4 metal rubber blocks in the metamaterial structure cells are surrounded to form a diamond structure, a mandrel 4 is penetrated in the center of each metal rubber block, and the metal rubber blocks 1 and the mandrel 4 are fixedly connected through brazing, solid-phase welding, fusion welding, riveting and other processes. The two ends of the mandrel are connected with a connecting piece 3, and a slotted hole for inserting the end part of the mandrel is formed in the connecting piece 3; four jacks distributed in a cross shape are arranged on the side part of the connecting piece, and the axes of the four jacks of the connecting piece are parallel to the diagonal line of the end face of the metal rubber block; the connecting pieces of the two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected through an elastic curved beam 2, the end parts of the elastic curved beam are inserted into insertion holes of the connecting pieces, the elastic curved beam is made of alloy, and the mandrel 4, the elastic curved beam 2 and the connecting pieces 3 are fixedly connected through processes of key pin connection, riveting, welding and the like. The metal rubber block adopts high-density metal rubber, the metal rubber is widely applied to severe working environments (high temperature, high pressure, corrosion and the like), important applications are realized in the aspects of shock resistance, vibration reduction, mechanical bearing and the like, the density of the metal rubber is higher, so that the metal rubber block is ensured to have certain rigidity, the plastic deformation of the metal rubber edges and corners under large impact load is prevented, and the problems that the traditional negative poisson ratio metamaterial is intolerant in extreme environments, poor in vibration reduction and impact resistance effects and the like are solved.
The elastic curved beam has initial deflection and is mutually combined through connecting pieces to form a negative poisson ratio frame, a positive poisson ratio metal rubber block is used as a basic phase, the negative poisson ratio frame is used as a reinforcing phase, and when in uniaxial pressure, the material can be subjected to local torsion and overall shrinkage deformation to generate a negative poisson ratio effect. The energy conversion is divided into three phases: in the first stage, when the impact load is applied, the metal rubber block generates torque to drive the mandrel, the connecting piece and the elastic curved beam with initial deflection, so that the material is subjected to local torsion and overall shrinkage deformation, a negative poisson ratio effect is generated, and energy is converted into elastic potential energy of the frame. In the second stage, the deformation of the frame reaches a certain degree to change the line contact between the metal rubber blocks into the surface contact, the metal rubber blocks become main bearing objects, the functions of anti-stamping load and limiting protection are achieved, the metal rubber blocks are pressed and expanded, and the whole deformation of the material is still in a negative poisson ratio state. At this time, most of the energy is dissipated by the dry friction damping between the turns inside the metal rubber block and a small portion of the energy is converted into elastic potential energy of the metal rubber block and the frame. The frame is always kept in the elastic range by the limiting protection effect of the metal rubber block, and the frame is still in the elastic deformation range by the buffering and limiting effects of the metal rubber, so that the excellent repeatable shock resistance, vibration reduction and mechanical bearing performance of the material are ensured, and the excellent repeatable shock resistance is ensured. And thirdly, after the external load is unloaded, the elastic potential energy is released, and the material is restored to the initial state.
In this embodiment, the cross section of the metal rubber block is square, the metal rubber block is a metal rubber matrix formed by winding, cold stamping or rolling a metal wire mesh laid by single or composite multi-strand wires, and is made by the basic working procedures of metal wire laying, braiding, preparing a blank, cold stamping and the like, the density of the metal rubber block is higher, so that the metal rubber block has certain rigidity, the plastic deformation of the metal rubber edges and corners under impact load is prevented, and the metal rubber block can also form a two-interpenetrating structure by polymer composite materials such as an elastic porous metal wire mesh and rubber (polyurethane). The cross section of the mandrel is also called square, vertical edges of two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected together, and the connection mode comprises modes of mutual stitching, winding and the like of silk screens.
In this embodiment, each row of elastic curved beams in the x-axis direction is connected by a connecting piece to form a wavy structure, and each column of elastic curved beams in the y-axis direction is also connected by a connecting piece to form a wavy structure, and the bending directions of two adjacent rows or two adjacent columns of two opposite elastic curved beams are opposite.
In the present embodiment, the acute angle α of the diamond structure in the metamaterial structure cell satisfiesThe arc length R of the elastic curved beam meets +.>L is the side length of the cross section of the metal rubber block (namely the side length of the diamond structure).
The negative poisson ratio metamaterial structure based on the metal rubber in the first embodiment is prepared according to the following steps:
(1) The method comprises the steps of preparing a high-density metal rubber block by using the existing mature process, and performing multiple procedures of laying a woven metal wire mesh, preparing a metal rubber blank, cold stamping and forming;
(2) The mandrel 4 is arranged in a central hole of the metal rubber block and is connected through processes such as riveting, brazing, solid-phase welding, fusion welding and the like; the metamaterial structure cells are arranged in a 2 multiplied by 2 array mode, so that the central holes are diamond-shaped, two adjacent metal rubber blocks are connected with each other, and the connection modes comprise modes of silk screen mutual stitching, winding and the like;
(3) The mandrel 4, the elastic curved beam 2 and the connecting piece 3 are mutually combined to form a negative poisson ratio frame, the negative poisson ratio frame is connected through processes of key pin connection, riveting, welding and the like, the elastic curved beam 2 has certain initial deflection, and the axes of four jacks of the connecting piece 3 are parallel to the diagonal line of the end face of the metal rubber block 1.
(4) The outer surface of the framework is subjected to rust-proof treatment through a coating.
Embodiment two: as shown in fig. 6 to 7, based on the first arrangement of the embodiment, the first row and the last row of metal rubber blocks may be made of rigid materials, and the second row and the last-to-last row of metal rubber blocks are high-density metal rubber bodies, the densities of which decrease sequentially toward the center, as shown in fig. 6. The metal rubber blocks on the outermost layer are transversely expanded by a small amplitude under load, but have a negative poisson ratio effect compared with the whole deformation, when the metal rubber blocks are subjected to a large impact load, the rigid material on the outer layer can avoid the irrecoverable deformation of edges and corners caused by concentrated load, the force is transmitted to the elastic frame, part of energy is absorbed and converted into elastic potential energy, the force is transmitted to the metal rubber, the concentrated force on the edges and corners is reduced, the density of the metal rubber blocks can be sequentially reduced towards the center, and the material has good spring damping performance, as shown in figure 7.
Embodiment III: as shown in fig. 8, on the basis of the first embodiment, the extension of the metamaterial structure cell along the z-axis direction can be realized by replacing the connectors of different interfaces, and the extension is from two dimensions to three dimensions; a connecting piece is shared between two adjacent metal rubber blocks in the z-axis direction, slots which are in plug-in fit with the end parts of the mandrel are formed in two ends of the connecting piece, and different energy absorption requirements are met by changing the stacking mode of cells, the volume, the density and the frame height of the metal rubber blocks.
Any of the above-described embodiments of the present utility model disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the utility model, and the numerical values listed above should not limit the protection scope of the utility model.
If the utility model discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the utility model can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (3)
1. A negative Poisson's ratio metamaterial structure based on metal rubber is characterized in that: the device is formed by periodically extending metamaterial structure cells along the x-axis direction and the y-axis direction, wherein each metamaterial structure cell comprises 4 metal rubber blocks which are arranged in a 2X 2 array mode, the middle parts of the 4 metal rubber blocks in each metamaterial structure cell are enclosed to form a diamond structure, a mandrel is arranged in the center of each metal rubber block in a penetrating mode, two ends of the mandrel are connected with connecting pieces, four insertion holes which are distributed in a cross mode are arranged on the side parts of the connecting pieces, and the axes of the four insertion holes of the connecting pieces are parallel to the diagonal lines of the end faces of the metal rubber blocks; the connecting pieces of the two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected through an elastic curved beam, and the end parts of the elastic curved beam are inserted into insertion holes of the connecting pieces.
2. The metal rubber based negative poisson's ratio metamaterial structure according to claim 1, wherein: the cross section of the metal rubber block is square, and vertical edges of two adjacent metal rubber blocks in the x-axis direction and the y-axis direction are connected together.
3. The metal rubber based negative poisson's ratio metamaterial structure according to claim 1, wherein: each row of elastic curved beams in the x-axis direction are connected through a connecting piece to form a wavy structure, each column of elastic curved beams in the y-axis direction are also connected through a connecting piece to form a wavy structure, and the bending directions of two adjacent rows or two adjacent columns of two opposite elastic curved beams are opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320114406.7U CN219734044U (en) | 2023-01-13 | 2023-01-13 | Negative poisson ratio metamaterial structure based on metal rubber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320114406.7U CN219734044U (en) | 2023-01-13 | 2023-01-13 | Negative poisson ratio metamaterial structure based on metal rubber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219734044U true CN219734044U (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320114406.7U Active CN219734044U (en) | 2023-01-13 | 2023-01-13 | Negative poisson ratio metamaterial structure based on metal rubber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219734044U (en) |
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- 2023-01-13 CN CN202320114406.7U patent/CN219734044U/en active Active
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