CN214838069U - Buffering energy-absorbing vibration-damping negative Poisson ratio structure formed by unit cell cross stacking - Google Patents
Buffering energy-absorbing vibration-damping negative Poisson ratio structure formed by unit cell cross stacking Download PDFInfo
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- CN214838069U CN214838069U CN202120399292.6U CN202120399292U CN214838069U CN 214838069 U CN214838069 U CN 214838069U CN 202120399292 U CN202120399292 U CN 202120399292U CN 214838069 U CN214838069 U CN 214838069U
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- 238000013016 damping Methods 0.000 title claims abstract description 13
- 230000003139 buffering effect Effects 0.000 title claims abstract description 11
- 230000000694 effects Effects 0.000 claims description 8
- 239000002356 single layer Substances 0.000 claims description 6
- 238000010146 3D printing Methods 0.000 claims description 3
- 238000003491 array Methods 0.000 claims description 2
- 210000004027 cell Anatomy 0.000 abstract description 45
- 210000005056 cell body Anatomy 0.000 abstract description 2
- 239000011162 core material Substances 0.000 abstract 1
- 239000000178 monomer Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 241000264877 Hippospongia communis Species 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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Abstract
The utility model discloses a single cell alternately piles up buffering energy-absorbing damping negative poisson ratio structure that forms belongs to the metamaterial field, and this structure includes a plurality of single cells, the single cell be the integrated into one piece structure, this single cell includes by stretching along three direction and inside hollow indent polygon single cell alternately piles up and forms, the single cell includes that to extend along three direction and the branch that links to each other at the center, branch sees alone by half indent honeycomb, uses the circular arc that the thickness is thinner at the end to replace two horizontally short crossbars about simple vertical pole connects, short crossbars pass through the down tube respectively in the center of other branches crossing in the cell body. The utility model discloses an overall structure piles up monomer unit cell through repeated array and obtains final space spatial structure, and the extension of three direction makes the structure more have the flexibility, is fit for as filling and pressing from both sides the core material.
Description
Technical Field
The utility model relates to a metamaterial field, concretely relates to buffering energy-absorbing damping structure with negative poisson's ratio effect.
Background
Meta-materials (metamaterials) refer to a class of man-made materials with special properties that are not found in nature. They possess special properties, including in various fields of mechanics, optics, acoustics, etc., which cannot be achieved by conventional materials. The peculiar nature of the metamaterial does not substantially derive from the particularity of the material itself used, but from the precise design of the structure in terms of dimensions and shape.
The poisson's ratio effect is a relatively common property of metamaterials, and in such metamaterials, the situation of stretching, expanding, compressing and contracting which is not possessed by common materials occurs.
Due to the special properties of the material, when the material is collided or compressed, the material is not as loose as the traditional material structure, and is tightened inwards and upwards, so that the mechanical properties of the structure are changed, and the material is considered as a buffer filler, an energy absorption box, a damping and noise reducing material and the like, and is good in various fields including aerospace, automobiles, even sports equipment and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a buffering energy-absorbing damping negative poisson ratio structure that single cell alternately piles up formation to the problem that exists among the prior art, this structure all has obvious negative poisson ratio effect and has buffering energy-absorbing, damping concurrently and presses down the spatial structure who shakes on all directions, and it is more nimble only to prolong the structure that two directions were laid than the tradition, also has better stability.
The utility model discloses a realize like this:
a buffering energy-absorbing vibration-damping negative Poisson's ratio structure formed by unit cells in a crossed and stacked mode is characterized in that the structure comprises a plurality of unit cells, the unit cells are of an integrally formed structure, the integrally formed structure comprises three hollow branches with the same shape, and a certain angle is formed between the three hollow branches; the hollow branch is shaped as an inwards concave honeycomb half edge, the hollow branch comprises horizontal rods arranged up and down, the tail ends of the horizontal rods arranged up and down are circular arcs, and the circular arc edges are connected with the horizontal rods up and down; the other end of the horizontal rod is connected with two coplanar inner oblique rods with the same centripetal angle, the tail ends of the oblique rods are transited to be connected with the horizontal short rods to be intersected at the middle point, the inner sides of the horizontal short rods are connected with the thick short rods, three hollow branches of the unit cell are intersected at the middle point and are connected with each other through three same thick short rods, and a centralized mass block is formed in the middle. The size of the unit cell can be changed by calculation according to actual requirements, and the thicknesses of the horizontal rods, the horizontal short rods and the inclined rods of the whole unit cell are consistent unless the thicknesses are specially specified to be consistent. The unit cell is formed by crosswise stacking inwards-concave polygonal unit cells which extend along three directions and are hollow inside, each unit cell comprises branches which extend along the three directions and are connected at the center, each branch is independently seen to be a half of an inwards-concave honeycomb, an arc with a thinner thickness is used at the tail end to replace a pure vertical rod to connect an upper horizontal short transverse rod and a lower horizontal short transverse rod, and the short transverse rods are respectively intersected at the centers of cell bodies in other branches through oblique rods.
Furthermore, the horizontal rod is thickest, the arc is thinnest, and the arc is an energy absorption ring.
Furthermore, the tail end of the horizontal section rod is in an isosceles triangle shape.
Further, the negative Poisson ratio structure is integrally formed by 3D printing.
Furthermore, a certain angle is arranged between the three hollow branches, and the angles are equal or unequal; when the spacing angles between the three hollow branches are equal, namely the spacing between the hollow branches in the unit cell is 120 degrees, the whole unit cell is in a rotationally symmetrical pattern.
Furthermore, the plurality of unit cell arrays are stacked in a crossed manner to form a three-dimensional structure, the structure is stacked in a crossed manner in a spatial vertical direction, horizontally extends along the normal direction of the forked tip surface in the horizontal direction, is arranged in a single layer, and is a honeycomb net-shaped structure; the cross stacking is a stacking mode in the space vertical direction, the geometric center point of the concave part of one unit cell is used as the falling point of one branch tip of the other unit cell, and the tip point is superposed with the geometric center point.
Furthermore, a vertical rod with an arc energy absorption ring at the end is connected with a next completely hollow unit with a sunken center between the space vertical direction units to realize a negative Poisson ratio effect; the horizontal extension is that when the single-layer is laid, one hollow branch corresponds to the extension directions in two directions, and the tail end of the hollow branch is an isosceles triangle, so that two surface normal directions are arranged on two column surfaces.
Compared with the prior art, the utility model beneficial effect lie in:
1. the utility model is obtained by stacking the unit cells repeatedly in translation and rotation, the shape is flexible and changeable, and the size of the unit cells can be changed according to calculation;
2. the utility model introduces the thin circular ring edge which is easier to deform, so that the structure is easier to deform at the parts after being stressed, and the energy absorption performance of the structure is improved;
3. the utility model discloses a thickening unit cell middle part forms local concentrated quality piece, can form local vibration power consumption district, reaches the effect of damping.
Drawings
FIG. 1 is a schematic diagram of a single cell in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the single cell single branch shape of the present invention;
FIG. 3 is a schematic diagram of the vertical stacking of unit cells according to the present invention;
FIG. 4 is a schematic diagram of the arrangement in the unit cell plane of the present invention;
FIG. 5 is a schematic top view of the macro structure of the unit cell utility model;
wherein, 1-horizontal rod, 2-arc, 3-diagonal rod, 4-horizontal short rod and 5-thick short rod.
Detailed Description
In order to make the purpose, technical solution and effect of the present invention clearer and more clear, it is clear that the following list examples are to the present invention for further detailed description. It should be noted that the embodiments described herein are only for explaining the present invention and are not used to limit the present invention.
FIG. 1 is a schematic diagram of a single cell microscopic structure, wherein three concave hollow polygonal branches with the same shape rotate around a central point to obtain a rotational symmetry figure with an angle of 120 degrees, and the single cell is of an integrally formed structure and is integrally processed and formed by 3D printing.
Fig. 2 is a schematic plan view of a single cell hollow branch, wherein two parallel horizontal rods 1 with equal length are connected by an arc 2, the rear ends of the horizontal rods 1 are connected with two centripetal inclined rods 3 with the same angle with the horizontal rods, the rear ends of the inclined rods 3 are transited to short rods with thicker thickness, three same thick and short rods 5 are connected with each other, and a concentrated mass block is formed in the middle. The parts of the front end and the rear end of the whole branch, which need to be connected with other units, are connected by adopting 120-degree isosceles triangle cylindrical surfaces with the maximum internal angle;
fig. 3 is a schematic diagram of the stacking of the cells in the vertical direction according to the present invention; FIG. 4 is a schematic diagram of the arrangement in the unit cell plane of the present invention; FIG. 5 is a top view of a buffering, energy-absorbing, vibration-damping and negative Poisson's ratio macroscopic structure formed by unit cell cross stacking, which is formed by a plurality of unit cell cross stacking, wherein the buffering, energy-absorbing, vibration-damping and negative Poisson's ratio structure formed by the unit cell cross stacking is composed of a plurality of same unit cells and comprises three hollow branches with the same shape, and the branches are half-edge concave honeycombs which change vertical walls into arc-shaped thin walls, are easy to deform when compressed and absorb more energy.
The unit cell is hollow as a whole, so that the unit cell can be seen visually, when the upper layer is pressed, the middle ring device is extruded to be compressed, meanwhile, the force is transmitted to the lower layer, the lower layer is connected with the hollow part of the unit cell, the middle concave part is sunk by the pressure, the inclined rod 3 is straightened, and then the negative Poisson ratio effect is generated. The single-layer arrangement is a honeycomb net-shaped structure, the layers are arranged in a cross stacking manner, and the buffer performance of the structure is enhanced because a plurality of layers of hollow bodies exist in the vertical direction and the force transmission path is longer; the cross stacking is a stacking mode in the space vertical direction, a one-to-one upward stacking mode is not adopted, the geometric center point of a single cell concave part is used as a falling point of a branch tip of another single cell, and a tip point is superposed with the geometric center point; horizontal extension, namely when single-layer laying is carried out, one branch corresponds to the extension direction in two directions, because the tail end of the branch is an isosceles triangle, and two columns face outwards and have two surface normal directions; due to the cross stacking mode, the mass concentration area in the middle of the unit is not directly restrained in the vertical direction and is only connected to the three branched inclined rods 3, and vibration can be locally generated during vibration to consume energy generated by a vibration source.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principles of the present invention, and these modifications should also be regarded as the protection scope of the present invention.
Claims (7)
1. A buffering energy-absorbing vibration-damping negative Poisson's ratio structure formed by unit cells in a crossed and stacked mode is characterized in that the structure comprises a plurality of unit cells, the unit cells are of an integrally formed structure, the integrally formed structure comprises three hollow branches with the same shape, and a certain angle is formed between the three hollow branches; the hollow branch is shaped as an inwards concave honeycomb half edge, the hollow branch comprises a horizontal rod (1) which is arranged up and down, the tail end of the horizontal rod (1) which is arranged up and down is provided with an arc (2), and the edge of the arc (2) is connected with the horizontal rod (1) up and down; the other end of the horizontal rod (1) is connected with two coplanar inner inclined rods (3) which have the same centripetal angle with the horizontal rod, the tail ends of the inclined rods (3) are transited to be connected with the horizontal short rods (4) to intersect at the middle point, the inner sides of the horizontal short rods (4) are connected with the thick short rods (5), three hollow branches of a single cell are branched to intersect at the middle point and are connected with each other through three same thick short rods (5), and a concentrated mass block is formed in the middle.
2. The structure of claim 1, wherein the horizontal bar (1) has the thickest thickness, the circular arc (2) has the thinnest thickness, and the circular arc (2) is an energy absorbing ring.
3. The structure of claim 1, wherein the horizontal bars have isosceles triangle ends.
4. The cross-cell stacked buffering, energy-absorbing and vibration-damping negative Poisson ratio structure of claim 1, wherein the negative Poisson ratio structure is integrally formed by 3D printing.
5. The structure of claim 1, wherein the three hollow branches are separated by an angle, which is equal or unequal; when the spacing angles between the three hollow branches are equal, namely the spacing between the hollow branches in the unit cell is 120 degrees, the whole unit cell is in a rotationally symmetrical pattern.
6. The structure of claim 1, wherein the plurality of unit cell arrays are stacked in a crossed manner to form a three-dimensional structure, the structure is stacked in a crossed manner in a spatial vertical direction, horizontally extends along a normal direction of a bifurcation tip surface in a horizontal direction, is arranged in a single layer, and is a honeycomb net-shaped structure; the cross stacking is a stacking mode in the space vertical direction, the geometric center point of the concave part of one unit cell is used as the falling point of one branch tip of the other unit cell, and the tip point is superposed with the geometric center point.
7. The structure of claim 6, wherein the units in the vertical direction of the space are connected by a vertical rod with an energy absorbing ring of which the tip is provided with an arc (2) to the next unit which is completely hollow and is sunken in the center, so as to realize the negative Poisson ratio effect; the horizontal extension is that when the single-layer is laid, one hollow branch corresponds to the extension directions in two directions, and the tail end of the hollow branch is an isosceles triangle, so that two surface normal directions are arranged on two column surfaces.
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| CN202120399292.6U CN214838069U (en) | 2021-02-23 | 2021-02-23 | Buffering energy-absorbing vibration-damping negative Poisson ratio structure formed by unit cell cross stacking |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115405644A (en) * | 2022-08-24 | 2022-11-29 | 广州大学 | Negative Poisson's ratio structure based on extremely small curved surface and design method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115405644A (en) * | 2022-08-24 | 2022-11-29 | 广州大学 | Negative Poisson's ratio structure based on extremely small curved surface and design method thereof |
| CN115405644B (en) * | 2022-08-24 | 2023-07-18 | 广州大学 | Negative poisson ratio structure based on minimum curved surface and design method thereof |
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